Fully move getShade into the clientLevelWrapper

# Conflicts:
#	core/src/main/java/com/seibel/distanthorizons/core/api/internal/ClientApi.java
#	core/src/main/java/com/seibel/distanthorizons/core/level/ClientLevelModule.java

api/src/main/java/com/seibel/distanthorizons/api/interfaces/block/IDhApiBlockStateWrapper.java

@@ -42,6 +42,12 @@ public interface IDhApiBlockStateWrapper extends IDhApiUnsafeWrapper
 	/** @since API 1.0.0 */
 	boolean isLiquid();
 	
+	/**
+	 * Returns a value between 0 (fully transparent) and 16 (fully opaque).
+	 * @since 6.1.0 
+	 */
+	int getOpacity();
+	
 	/**
 	 * Returns the full serialized form of the given block
 	 * as defined by DH's serialization methods.

api/src/main/java/com/seibel/distanthorizons/api/methods/events/abstractEvents/DhApiBlockColorOverrideEvent.java

@@ -107,16 +107,24 @@ public abstract class DhApiBlockColorOverrideEvent implements IDhApiEvent<DhApiB
 		public IDhApiLevelWrapper getLevelWrapper() { return levelWrapper; }
 		
 		public int getColorAsInt() { return this.colorAsInt; }
+		public int getAlpha() { return ColorUtil.getAlpha(this.colorAsInt); }
 		public int getRed() { return ColorUtil.getRed(this.colorAsInt); }
 		public int getGreen() { return ColorUtil.getGreen(this.colorAsInt); }
 		public int getBlue() { return ColorUtil.getBlue(this.colorAsInt); }
-		public void setColor(int red, int green, int blue) throws IllegalArgumentException
+		public void setColor(int red, int green, int blue) throws IllegalArgumentException { this.setColor(this.getAlpha(), red, green, blue); }
+		/** 
+		 * Note: when if you set a partially transparent alpha channel the underlying {@link IDhApiBlockStateWrapper#getOpacity()}
+		 * method should also return a non-opaque value.
+		 * Otherwise LODs may behave incorrectly.
+		 */
+		public void setColor(int alpha, int red, int green, int blue) throws IllegalArgumentException
 		{
+			ColorUtil.throwIfColorValueOutOfIntRange("alpha", alpha);
 			ColorUtil.throwIfColorValueOutOfIntRange("red", red);
 			ColorUtil.throwIfColorValueOutOfIntRange("green", green);
 			ColorUtil.throwIfColorValueOutOfIntRange("blue", blue);
 			
-			this.colorAsInt = ColorUtil.rgbToInt(red, green, blue);
+			this.colorAsInt = ColorUtil.argbToInt(alpha, red, green, blue);
 		}
 		
 		/** @return the block's X value in the world */

api/src/main/java/com/seibel/distanthorizons/coreapi/DependencyInjection/DependencyInjector.java

@@ -35,7 +35,7 @@ import java.util.Map;
  */
 public class DependencyInjector<BindableType extends IBindable> implements IDependencyInjector<BindableType> // Note to self: Don't try adding a generic type to IDhApiEvent, the constructor won't accept it
 {
-	protected final Map<Class<? extends BindableType>, ArrayList<BindableType>> dependencies = new HashMap<>();
+	protected final HashMap<Class<? extends BindableType>, ArrayList<BindableType>> dependencies = new HashMap<>();
 	
 	/** Internal class reference to BindableType since we can't get it any other way. */
 	protected final Class<? extends BindableType> bindableInterface;

api/src/main/java/com/seibel/distanthorizons/coreapi/ModInfo.java

@@ -31,7 +31,7 @@ public final class ModInfo
 	public static final String DEDICATED_SERVER_INITIAL_PATH = "dedicated_server_initial";
 	
 	/** Incremented every time any packets are added, changed or removed, with a few exceptions. */
-	public static final int PROTOCOL_VERSION = 13;
+	public static final int PROTOCOL_VERSION = 14;
 
 	/** 
 	 * The full plugin channel name (RESOURCE_NAMESPACE:WRAPPER_PACKET_PATH) 
@@ -43,16 +43,16 @@ public final class ModInfo
 	public static final String NAME = "DistantHorizons";
 	/** Human-readable version of NAME */
 	public static final String READABLE_NAME = "Distant Horizons";
-	public static final String VERSION = "3.0.1-b";
+	public static final String VERSION = "3.0.4-b-dev";
 	/** Returns true if the current build is an unstable developer build, false otherwise. */
 	public static final boolean IS_DEV_BUILD = VERSION.toLowerCase().contains("dev");
 	
 	/** This version should only be updated when breaking changes are introduced to the DH API */
 	public static final int API_MAJOR_VERSION = 6;
 	/** This version should be updated whenever new methods are added to the DH API */
-	public static final int API_MINOR_VERSION = 0;
+	public static final int API_MINOR_VERSION = 1;
 	/** This version should be updated whenever non-breaking fixes are added to the DH API */
-	public static final int API_PATCH_VERSION = 0;
+	public static final int API_PATCH_VERSION = 1;
 	
 	/** If the config file has an older version it'll be re-created from scratch. */
 	public static final int CONFIG_FILE_VERSION = 4;

core/src/main/java/com/seibel/distanthorizons/core/Initializer.java

@@ -54,7 +54,7 @@ public class Initializer
 	
 	
 	
-	public static void init()
+	public static void preConfigInit()
 	{
 		//============================//
 		// check referenced libraries //
@@ -177,6 +177,11 @@ public class Initializer
 		
 		//endregion
 		
+	}
+	
+	/** fired after DH's config has been set up */
+	public static void postConfigInit()
+	{
 		
 		
 		//==============================//
@@ -238,8 +243,7 @@ public class Initializer
 		
 		//endregion
 		
-		
-		
 	}
 	
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/api/internal/ClientApi.java

@@ -24,6 +24,7 @@ import com.seibel.distanthorizons.api.enums.config.EDhApiMcRenderingFadeMode;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiRenderPass;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.*;
 import com.seibel.distanthorizons.core.api.internal.rendering.DhRenderState;
+import com.seibel.distanthorizons.core.dependencyInjection.ModAccessorInjector;
 import com.seibel.distanthorizons.core.enums.MinecraftTextFormat;
 import com.seibel.distanthorizons.core.file.structure.ClientOnlySaveStructure;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
@@ -40,6 +41,8 @@ import com.seibel.distanthorizons.core.util.objects.Pair;
 import com.seibel.distanthorizons.core.util.objects.RollingAverage;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor.IImmersivePortalsAccessor;
+import com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor.IIrisAccessor;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.renderPass.IDhMetaRenderer;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.renderPass.IDhVanillaFadeRenderer;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.renderPass.IDhTestTriangleRenderer;
@@ -51,7 +54,6 @@ import com.seibel.distanthorizons.coreapi.ModInfo;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiDebugRendering;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiRendererMode;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
-import com.seibel.distanthorizons.core.level.IServerKeyedClientLevel;
 import com.seibel.distanthorizons.core.world.AbstractDhWorld;
 import com.seibel.distanthorizons.core.world.DhClientWorld;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
@@ -63,8 +65,10 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.lwjgl.glfw.GLFW;
 
+import java.awt.*;
 import java.io.File;
 import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.ThreadPoolExecutor;
@@ -84,6 +88,11 @@ public class ClientApi
 	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	private static final IMinecraftRenderWrapper MC_RENDER = SingletonInjector.INSTANCE.get(IMinecraftRenderWrapper.class);
 	
+	// Need to classload this field later because otherwise it will be null even when Immersive Portals is present.
+	public static class Late {
+		private static final IImmersivePortalsAccessor IMMERSIVE_PORTALS = ModAccessorInjector.INSTANCE.get(IImmersivePortalsAccessor.class);
+	}
+	
 	/** this includes the is dev build message and low allocated memory warning */
 	private static final int MS_BETWEEN_STATIC_STARTUP_MESSAGES = 4_000;
 	
@@ -116,7 +125,7 @@ public class ClientApi
 	
 	public boolean rendererDisabledBecauseOfExceptions = false;
 	
-	private final ClientPluginChannelApi pluginChannelApi = new ClientPluginChannelApi(this::clientLevelLoadEvent, this::clientLevelUnloadEvent);
+	private final ClientPluginChannelApi pluginChannelApi = new ClientPluginChannelApi();
 	
 	/** Delay loading the first level to give the server some time to respond with level to actually load */
 	private Timer firstLevelLoadTimer;
@@ -124,8 +133,8 @@ public class ClientApi
 	
 	/** Holds any levels that were loaded before the {@link ClientApi#onClientOnlyConnected} was fired. */
 	public final HashSet<IClientLevelWrapper> waitingClientLevels = new HashSet<>();
-	/** Holds any chunks that were loaded before the {@link ClientApi#clientLevelLoadEvent(IClientLevelWrapper)} was fired. */
-	public final HashMap<Pair<IClientLevelWrapper, DhChunkPos>, IChunkWrapper> waitingChunkByClientLevelAndPos = new HashMap<>();
+	/** Holds any chunks that were found before the client levels are loaded. */
+	public final Map<Pair<IClientLevelWrapper, DhChunkPos>, IChunkWrapper> waitingChunkByClientLevelAndPos = new ConcurrentHashMap<>();
 	
 	/** publicly available so {@link F3Screen} can display the error */
 	@Nullable
@@ -141,12 +150,25 @@ public class ClientApi
 	 * tracked should also be to keep the ratio roughly the same.
 	 * @see ClientApi#MIN_MS_BETWEEN_SPEED_CHECKS
 	 */
-	public RollingAverage cameraSpeedRollingAverage = new RollingAverage(40);
+	private RollingAverage cameraSpeedRollingAverage = new RollingAverage(40);
 	private Vec3d lastCameraPosForSpeedCheck = new Vec3d();
 	private long msSinceLastSpeedCheck = 0L;
+	public double getAvgCameraSpeed()
+	{
+		return cameraSpeedRollingAverage.getAverage();
+	}
 	
 	public static long firstRenderTimeMs = 0;
 	
+	/** 
+	 * keeping track of this is necessary to fix
+	 * out-of-date LODs from rendering when the shading
+	 * is changed by Iris, causing LODs to often
+	 * lack the side shading, which looks pretty bad
+	 * when shaders are disabled.
+	 */
+	private boolean irisShadersEnabledLastFrame = false;
+	
 	
 	
 	//==============//
@@ -160,11 +182,11 @@ public class ClientApi
 	//==============//
 	// world events //
 	//==============//
-	//region
+	//region world events
 	
 	/**
 	 * May be fired slightly before or after the associated
-	 * {@link ClientApi#clientLevelLoadEvent(IClientLevelWrapper)} event
+	 * level is loaded
 	 * depending on how the host mod loader functions. <br><br>
 	 * 
 	 * Synchronized shouldn't be necessary, but is present to match {@see onClientOnlyDisconnected} and prevent any unforeseen issues. 
@@ -201,14 +223,6 @@ public class ClientApi
 			
 			this.pluginChannelApi.onJoinServer(world.networkState.getSession());
 			world.networkState.sendConfigMessage();
-			
-			LOGGER.info("Loading [" + this.waitingClientLevels.size() + "] waiting client level wrappers.");
-			for (IClientLevelWrapper level : this.waitingClientLevels)
-			{
-				this.clientLevelLoadEvent(level);
-			}
-			
-			this.waitingClientLevels.clear();
 		}
 	}
 	
@@ -235,7 +249,55 @@ public class ClientApi
 		
 		// remove any waiting items
 		this.waitingChunkByClientLevelAndPos.clear();
-		this.waitingClientLevels.clear();
+	}
+	
+	//endregion
+	
+	
+	
+	//==============//
+	// level events //
+	//==============//
+	//region level events
+	
+	/** 
+	 * used in conjunction with the server networking to
+	 * handle level load requests. 
+	 */
+	public boolean canLoadClientLevel(IClientLevelWrapper wrapper) 
+	{
+		// wait a moment before loading the level to give the server a chance to handle the client's login request
+		if (MC_CLIENT.clientConnectedToDedicatedServer())
+		{
+			if (this.firstLevelLoadTimer == null)
+			{
+				this.firstLevelLoadTimer = TimerUtil.CreateTimer("FirstLevelLoadTimer");
+				this.firstLevelLoadTimer.schedule(new TimerTask()
+				{
+					@Override
+					public void run() { canLoadClientLevel(wrapper); }
+				}, FIRST_LEVEL_LOAD_DELAY_IN_MS);
+				return false;
+			}
+			
+			this.firstLevelLoadTimer.cancel();
+		}
+		
+		if (!this.pluginChannelApi.allowLevelLoading(wrapper))
+		{
+			LOGGER.debug("Client levels in this connection are managed by the server, skipping auto-load of: ["+wrapper+"]");
+			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
+			if (world == null)
+			{
+				return false;
+			}
+			
+			// Instead of attempting to load themselves, send the config and wait for a server provided level key.
+			((DhClientWorld) world).networkState.sendLevelInitRequest(wrapper.getDimensionName());
+			return false;
+		}
+		
+		return true;
 	}
 	
 	//endregion
@@ -247,95 +309,7 @@ public class ClientApi
 	//==============//
 	//region
 	
-	public void clientLevelUnloadEvent(IClientLevelWrapper level)
-	{
-		try
-		{
-			LOGGER.info("Unloading client level [" + level.getClass().getSimpleName() + "]-[" + level.getDhIdentifier() + "].");
-			
-			if (level instanceof IServerKeyedClientLevel)
-			{
-				this.pluginChannelApi.onClientLevelUnload();
-			}
-			
-			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
-			if (world != null)
-			{
-				world.unloadLevel(level);
-				ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(level));
-			}
-			else
-			{
-				this.waitingClientLevels.remove(level);
-			}
-		}
-		catch (Exception e)
-		{
-			// handle errors here to prevent blowing up a mixin or API up stream
-			LOGGER.error("Unexpected error in ClientApi.clientLevelUnloadEvent(), error: "+e.getMessage(), e);
-		}
-	}
-	
-	public void clientLevelLoadEvent(@Nullable IClientLevelWrapper levelWrapper)
-	{
-		// can happen if there was an issue during level load
-		if (levelWrapper == null)
-		{
-			return;
-		}
-		
-		
-		// wait a moment before loading the level to give the server a chance to handle the client's login request
-		if (MC_CLIENT.clientConnectedToDedicatedServer())
-		{
-			if (this.firstLevelLoadTimer == null)
-			{
-				this.firstLevelLoadTimer = TimerUtil.CreateTimer("FirstLevelLoadTimer");
-				this.firstLevelLoadTimer.schedule(new TimerTask()
-				{
-					@Override
-					public void run() { ClientApi.this.clientLevelLoadEvent(levelWrapper); }
-				}, FIRST_LEVEL_LOAD_DELAY_IN_MS);
-				return;
-			}
-			this.firstLevelLoadTimer.cancel();
-		}
-		
-		
-		try
-		{
-			LOGGER.info("Loading client level [" + levelWrapper + "]-[" + levelWrapper.getDhIdentifier() + "].");
-			
-			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
-			if (world != null)
-			{
-				if (!this.pluginChannelApi.allowLevelLoading(levelWrapper))
-				{
-					LOGGER.info("Levels in this connection are managed by the server, skipping auto-load.");
-					
-					// Instead of attempting to load themselves, send the config and wait for a server provided level key.
-					((DhClientWorld) world).networkState.sendConfigMessage();
-					return;
-				}
-				
-				
-				world.getOrLoadLevel(levelWrapper);
-				ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(levelWrapper));
-				
-				this.loadWaitingChunksForLevel(levelWrapper);
-			}
-			else
-			{
-				this.waitingClientLevels.add(levelWrapper);
-			}
-		}
-		catch (Exception e)
-		{
-			// handle errors here to prevent blowing up a mixin or API up stream
-			LOGGER.error("Unexpected error in ClientApi.clientLevelLoadEvent(), error: "+e.getMessage(), e);
-		}
-	}
-	private void loadWaitingChunksForLevel(IClientLevelWrapper level)
+	public void loadWaitingChunksForLevel(IClientLevelWrapper level)
 	{
 		HashSet<Pair<IClientLevelWrapper, DhChunkPos>> keysToRemove = new HashSet<>();
 		for (Pair<IClientLevelWrapper, DhChunkPos> levelChunkPair : this.waitingChunkByClientLevelAndPos.keySet())
@@ -364,7 +338,7 @@ public class ClientApi
 	//============//
 	// networking //
 	//============//
-	//region
+	//region networking
 	
 	/**
 	 * Forwards a decoded message into the registered handlers.
@@ -404,7 +378,7 @@ public class ClientApi
 	//===============//
 	// LOD rendering //
 	//===============//
-	//region
+	//region lod rendering
 	
 	/** Should be called before {@link ClientApi#renderDeferredLodsForShaders} */
 	public void renderLods() { this.renderLodLayer(false); }
@@ -428,12 +402,16 @@ public class ClientApi
 			//===========//
 			//region
 			
-			//DhApiTerrainDataRepo.asyncDebugMethod(
-			//	RENDER_STATE.clientLevelWrapper,
-			//	MC_CLIENT.getPlayerBlockPos().getX(),
-			//	MC_CLIENT.getPlayerBlockPos().getY(),
-			//	MC_CLIENT.getPlayerBlockPos().getZ()
-			//);
+			// only run these tasks once per frame
+			if (!renderingDeferredLayer)
+			{
+				//DhApiTerrainDataRepo.asyncDebugMethod(
+				//	RENDER_STATE.clientLevelWrapper,
+				//	MC_CLIENT.getPlayerBlockPos().getX(),
+				//	MC_CLIENT.getPlayerBlockPos().getY(),
+				//	MC_CLIENT.getPlayerBlockPos().getZ()
+				//);
+			}
 			
 			//endregion
 			
@@ -482,7 +460,7 @@ public class ClientApi
 					//region
 					
 					long nowMs = System.currentTimeMillis();
-					if (this.msSinceLastSpeedCheck + MIN_MS_BETWEEN_SPEED_CHECKS < nowMs)
+					if (this.msSinceLastSpeedCheck + MIN_MS_BETWEEN_SPEED_CHECKS < nowMs && (Late.IMMERSIVE_PORTALS == null || !Late.IMMERSIVE_PORTALS.isRenderingPortal()))
 					{
 						// calc time since last check
 						double secSinceLastCheck = (nowMs - this.msSinceLastSpeedCheck) / 1_000.0;
@@ -499,6 +477,27 @@ public class ClientApi
 					}
 					
 					//endregion
+					
+					
+					
+					//====================//
+					// Iris data re-build //
+					//====================//
+					//region
+					
+					// delayed getter since ClientApi is created before this accessor is bound
+					IIrisAccessor irisAccessor = ModAccessorInjector.INSTANCE.get(IIrisAccessor.class);
+					if (irisAccessor != null)
+					{
+						boolean shadersActive = irisAccessor.isShaderPackInUse();
+						if (this.irisShadersEnabledLastFrame != shadersActive)
+						{
+							this.irisShadersEnabledLastFrame = shadersActive;
+							DhApi.Delayed.renderProxy.clearRenderDataCache();
+						}
+					}
+					
+					//endregion
 				}
 			}
 			
@@ -667,7 +666,7 @@ public class ClientApi
 	//================//
 	// fade rendering //
 	//================//
-	//region
+	//region fade rendering
 	
 	/** 
 	 * The first fade pass.
@@ -690,8 +689,7 @@ public class ClientApi
 				// or if LOD-only mode is enabled (fading is used to remove the MC render pass)
 				|| Config.Client.Advanced.Debugging.lodOnlyMode.get()
 			)
-			// don't fade when Iris shaders are active, otherwise the rendering can get weird
-			&& !DhApiRenderProxy.INSTANCE.getDeferTransparentRendering())
+			&& shouldRenderFade())
 		{
 			RenderParams renderParams = new RenderParams(EDhApiRenderPass.OPAQUE, RENDER_STATE);
 			fadeRenderer.render(renderParams);
@@ -720,8 +718,7 @@ public class ClientApi
 					// or if LOD-only mode is enabled (fading is used to remove the MC render pass)
 					|| Config.Client.Advanced.Debugging.lodOnlyMode.get()
 				)
-				// don't fade when Iris shaders are active, otherwise the rendering can get weird
-				&& !DhApiRenderProxy.INSTANCE.getDeferTransparentRendering();
+				&& shouldRenderFade();
 			if (renderFade)
 			{
 				RenderParams renderParams = new RenderParams(EDhApiRenderPass.TRANSPARENT, RENDER_STATE);
@@ -730,6 +727,25 @@ public class ClientApi
 		}
 	}
 	
+	private static boolean shouldRenderFade()
+	{
+		// don't fade when Iris shaders are active, otherwise the rendering can get weird
+		if (DhApiRenderProxy.INSTANCE.getDeferTransparentRendering())
+		{
+			return false;
+		}
+		
+		// When immersive portals and sodium are combined the fade renders on top of the portal, so turn it off when a portal is on-screen.
+		IImmersivePortalsAccessor immersivePortals = ModAccessorInjector.INSTANCE.get(IImmersivePortalsAccessor.class);
+		if (immersivePortals != null 
+			&& immersivePortals.wasPortalRecentlyVisible())
+		{
+			return false;
+		}
+		
+		return true;
+	}
+	
 	//endregion
 	
 	
@@ -737,7 +753,7 @@ public class ClientApi
 	//==========//
 	// keyboard //
 	//==========//
-	//region
+	//region keyboard
 	
 	/** Trigger once on key press, with CLIENT PLAYER. */
 	public void keyPressedEvent(int glfwKey)
@@ -773,7 +789,7 @@ public class ClientApi
 	//======//
 	// chat //
 	//======//
-	//region
+	//region chat
 	
 	private void sendQueuedChatMessages()
 	{

core/src/main/java/com/seibel/distanthorizons/core/api/internal/ClientPluginChannelApi.java

@@ -10,6 +10,7 @@ import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent
 import com.seibel.distanthorizons.core.network.messages.base.LevelInitMessage;
 import com.seibel.distanthorizons.core.network.session.NetworkSession;
 import com.seibel.distanthorizons.core.render.RenderThreadTaskHandler;
+import com.seibel.distanthorizons.core.world.AbstractDhWorld;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import org.jetbrains.annotations.NotNull;
@@ -30,9 +31,6 @@ public class ClientPluginChannelApi
 	private static final IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	private static final IKeyedClientLevelManager KEYED_CLIENT_LEVEL_MANAGER = SingletonInjector.INSTANCE.get(IKeyedClientLevelManager.class);
 	
-	private final Consumer<IServerKeyedClientLevel> levelLoadHandler;
-	private final Consumer<IClientLevelWrapper> levelUnloadHandler;
-	
 	@Nullable
 	public NetworkSession networkSession;
 	
@@ -42,10 +40,8 @@ public class ClientPluginChannelApi
 	// constructor //
 	//=============//
 	
-	public ClientPluginChannelApi(Consumer<IServerKeyedClientLevel> levelLoadHandler, Consumer<IClientLevelWrapper> levelUnloadHandler)
+	public ClientPluginChannelApi()
 	{
-		this.levelLoadHandler = levelLoadHandler;
-		this.levelUnloadHandler = levelUnloadHandler;
 	}
 	
 	
@@ -94,24 +90,6 @@ public class ClientPluginChannelApi
 		{
 			IClientLevelWrapper clientLevel = MC.getWrappedClientLevel(true);
 			IServerKeyedClientLevel existingKeyedClientLevel = KEYED_CLIENT_LEVEL_MANAGER.getServerKeyedLevel();
-
-			if (existingKeyedClientLevel != null)
-			{
-				if (!existingKeyedClientLevel.getServerLevelKey().equals(msg.levelKey))
-				{
-					LOGGER.info("Unloading previous level with key: [" + existingKeyedClientLevel.getServerLevelKey() + "].");
-					this.levelUnloadHandler.accept(existingKeyedClientLevel);
-				}
-				else
-				{
-					LOGGER.info("Level key matches the previous level key, ignoring the message.");
-				}
-			}
-			else
-			{
-				LOGGER.info("Unloading non-keyed level: [" + clientLevel.getDhIdentifier() + "].");
-				this.levelUnloadHandler.accept(clientLevel);
-			}
 			
 			if (existingKeyedClientLevel == null
 					|| !existingKeyedClientLevel.getServerKey().equals(msg.serverKey)
@@ -119,7 +97,11 @@ public class ClientPluginChannelApi
 			{
 				LOGGER.info("Loading level with key: [" + msg.levelKey + "].");
 				IServerKeyedClientLevel keyedLevel = KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(clientLevel, msg.serverKey, msg.levelKey);
-				this.levelLoadHandler.accept(keyedLevel);
+				AbstractDhWorld world = SharedApi.getAbstractDhWorld();
+				if (world != null)
+				{
+					world.getOrLoadLevel(keyedLevel);
+				}
 			}
 		});
 	}

core/src/main/java/com/seibel/distanthorizons/core/api/internal/ServerApi.java

@@ -19,13 +19,10 @@
 
 package com.seibel.distanthorizons.core.api.internal;
 
-import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelLoadEvent;
-import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
 import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
 import com.seibel.distanthorizons.core.network.messages.MessageRegistry;
 import com.seibel.distanthorizons.core.world.*;
 import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
-import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
@@ -77,7 +74,6 @@ public class ServerApi
 	}
 	
 	
-	
 	//==============//
 	// level events //
 	//==============//
@@ -90,7 +86,6 @@ public class ServerApi
 		if (serverWorld != null)
 		{
 			serverWorld.getOrLoadLevel(levelWrapper);
-			ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(levelWrapper));
 		}
 	}
 	public void serverLevelUnloadEvent(IServerLevelWrapper level)
@@ -101,12 +96,10 @@ public class ServerApi
 		if (serverWorld != null)
 		{
 			serverWorld.unloadLevel(level);
-			ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(level));
 		}
 	}
 	
 	
-	
 	//=======================//
 	// chunk modified events //
 	//=======================//
@@ -122,7 +115,7 @@ public class ServerApi
 	
 	public void serverPlayerJoinEvent(IServerPlayerWrapper player)
 	{
-		if (DhApiWorldProxy.INSTANCE.worldLoaded() && DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return;
 		}
@@ -136,7 +129,7 @@ public class ServerApi
 	}
 	public void serverPlayerDisconnectEvent(IServerPlayerWrapper player)
 	{
-		if (DhApiWorldProxy.INSTANCE.worldLoaded() && DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return;
 		}
@@ -150,7 +143,7 @@ public class ServerApi
 	}
 	public void serverPlayerLevelChangeEvent(IServerPlayerWrapper player, IServerLevelWrapper originLevel, IServerLevelWrapper destinationLevel)
 	{
-		if (DhApiWorldProxy.INSTANCE.worldLoaded() && DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return;
 		}
@@ -170,7 +163,7 @@ public class ServerApi
 	 */
 	public void pluginMessageReceived(IServerPlayerWrapper player, @NotNull AbstractNetworkMessage message)
 	{
-		if (DhApiWorldProxy.INSTANCE.worldLoaded() && DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return;
 		}

core/src/main/java/com/seibel/distanthorizons/core/api/internal/SharedApi.java

@@ -74,7 +74,6 @@ public class SharedApi
 	//region
 	
 	private SharedApi() { }
-	public static void init() { Initializer.init(); }
 	
 	//endregion
 	
@@ -212,7 +211,7 @@ public class SharedApi
 		}
 		
 		// ignore updates if the world is read-only
-		if (DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return;
 		}

core/src/main/java/com/seibel/distanthorizons/core/config/Config.java

@@ -964,6 +964,7 @@ public class Config
 				public static ConfigCategory debugWireframe = new ConfigCategory.Builder().set(DebugWireframe.class).build();
 				public static ConfigCategory openGl = new ConfigCategory.Builder().set(OpenGl.class).build();
 				public static ConfigCategory columnBuilderDebugging = new ConfigCategory.Builder().set(ColumnBuilderDebugging.class).build();
+				public static ConfigCategory positionFinderDebugging = new ConfigCategory.Builder().set(PositionFinder.class).build();
 				public static ConfigCategory f3Screen = new ConfigCategory.Builder().set(F3Screen.class).build();
 				public static ConfigCategory exampleConfigScreen = new ConfigCategory.Builder().set(ExampleConfigScreen.class).build();
 				
@@ -1095,6 +1096,36 @@ public class Config
 					
 				}
 				
+				public static class PositionFinder
+				{
+					//public static ConfigUIComment positionFinderHeader = new ConfigUIComment.Builder().setParentConfigClass(ColumnBuilderDebugging.class).build();
+
+					public static ConfigEntry<Boolean> positionFinderEnable = new ConfigEntry.Builder<Boolean>()
+						.set(false)
+						.build();
+					
+					public static ConfigEntry<Integer> positionFinderDetailLevel = new ConfigEntry.Builder<Integer>()
+						.set((int) DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL)
+						.build();
+					public static ConfigEntry<Integer> positionFinderXPos = new ConfigEntry.Builder<Integer>()
+						.set(0)
+						.build();
+					public static ConfigEntry<Integer> positionFinderZPos = new ConfigEntry.Builder<Integer>()
+						.set(0)
+						.build();
+					
+					public static ConfigEntry<Integer> positionFinderMinBlockY = new ConfigEntry.Builder<Integer>()
+						.set(-64)
+						.build();
+					public static ConfigEntry<Integer> positionFinderMaxBlockY = new ConfigEntry.Builder<Integer>()
+						.set(125)
+						.build();
+					public static ConfigEntry<Float> positionFinderMarginPercent = new ConfigEntry.Builder<Float>()
+						.set(0.0f)
+						.build();
+					
+				}
+				
 				public static class F3Screen
 				{
 					public static ConfigUIComment f3ScreenHeader = new ConfigUIComment.Builder().setParentConfigClass(F3Screen.class).build();

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/AbstractDelayedConfigEventHandler.java

@@ -0,0 +1,84 @@
+package com.seibel.distanthorizons.core.config.eventHandlers;
+
+import com.seibel.distanthorizons.core.config.listeners.IConfigListener;
+import com.seibel.distanthorizons.core.util.TimerUtil;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+public abstract class AbstractDelayedConfigEventHandler implements IConfigListener
+{
+	public static final long DEFAULT_TIMEOUT_IN_MS = 2_000L;
+	
+	/** how long to wait in milliseconds before applying the config changes */
+	private final long timeoutInMs;
+	private Timer timer;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	//region
+	
+	public AbstractDelayedConfigEventHandler(long timeoutInMs) { this.timeoutInMs = timeoutInMs; }
+	
+	//endregion
+	
+	
+	
+	//==================//
+	// abstract methods //
+	//==================//
+	//region
+	
+	public abstract void onConfigTimeout();
+	
+	//endregion
+	
+	
+	
+	//========//
+	// events //
+	//========//
+	//region
+	
+	@Override
+	public void onConfigValueSet()
+	{
+		if (this.timeoutInMs > 0)
+		{
+			this.refreshRenderDataAfterTimeout();
+		}
+		else
+		{
+			this.onConfigTimeout();
+		}
+	}
+	
+	/** Calling this method multiple times will reset the timer */
+	private synchronized void refreshRenderDataAfterTimeout() // synchronized to prevent potential threading issues when adding/removing the timer
+	{
+		// stop the previous timer if one exists
+		if (this.timer != null)
+		{
+			this.timer.cancel();
+		}
+		
+		// create a new timer task
+		TimerTask timerTask = new TimerTask()
+		{
+			public void run()
+			{
+				AbstractDelayedConfigEventHandler.this.onConfigTimeout();
+			}
+		};
+		this.timer = TimerUtil.CreateTimer("AbstractDelayedConfigTimer");
+		this.timer.schedule(timerTask, this.timeoutInMs);
+	}
+	
+	//endregion
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/ReloadLodsConfigEventHandler.java

@@ -27,72 +27,36 @@ import com.seibel.distanthorizons.core.util.TimerUtil;
 import java.util.Timer;
 import java.util.TimerTask;
 
-public class ReloadLodsConfigEventHandler implements IConfigListener
+public class ReloadLodsConfigEventHandler extends AbstractDelayedConfigEventHandler
 {
 	/** 
 	 * should be used for user facing UI options
 	 * this allows the user a second to click through options before they're applied
 	 */
-	public static ReloadLodsConfigEventHandler DELAYED_INSTANCE = new ReloadLodsConfigEventHandler(2_000L);
+	public static ReloadLodsConfigEventHandler DELAYED_INSTANCE = new ReloadLodsConfigEventHandler(AbstractDelayedConfigEventHandler.DEFAULT_TIMEOUT_IN_MS);
 	/** should be used for debug options so their change can be seen instantly */
 	public static ReloadLodsConfigEventHandler INSTANT_INSTANCE = new ReloadLodsConfigEventHandler(0);
 	
-	/** how long to wait in milliseconds before applying the config changes */
-	private final long timeoutInMs;
-	private Timer cacheClearingTimer;
-	
 	
 	
 	//=============//
 	// constructor //
 	//=============//
+	//region
 	
-	public ReloadLodsConfigEventHandler(long timeoutInMs)
-	{
-		this.timeoutInMs = timeoutInMs;
-	}
+	public ReloadLodsConfigEventHandler(long timeoutInMs) { super(timeoutInMs); }
+	
+	//endregion
 	
 	
 	
 	//========//
 	// events //
 	//========//
+	//region
 	
 	@Override
-	public void onConfigValueSet()
-	{ 
-		if (this.timeoutInMs > 0)
-		{
-			this.refreshRenderDataAfterTimeout();
-		}
-		else
-		{
-			clearRenderDataCache();
-		}
-	}
-	
-	/** Calling this method multiple times will reset the timer */
-	private synchronized void refreshRenderDataAfterTimeout() // synchronized to prevent potential threading issues when adding/removing the timer
-	{
-		// stop the previous timer if one exists
-		if (this.cacheClearingTimer != null)
-		{
-			this.cacheClearingTimer.cancel();
-		}
-		
-		// create a new timer task
-		TimerTask timerTask = new TimerTask()
-		{
-			public void run()
-			{
-				clearRenderDataCache();
-			}
-		};
-		this.cacheClearingTimer = TimerUtil.CreateTimer("RenderCacheClearConfigTimer");
-		this.cacheClearingTimer.schedule(timerTask, this.timeoutInMs);
-	}
-	
-	private static void clearRenderDataCache()
+	public void onConfigTimeout()
 	{
 		IDhApiRenderProxy renderProxy = DhApi.Delayed.renderProxy;
 		if (renderProxy != null)
@@ -101,5 +65,8 @@ public class ReloadLodsConfigEventHandler implements IConfigListener
 		}
 	}
 	
+	//endregion
+	
+	
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/config/eventHandlers/RenderBlockCacheCsvHandler.java

@@ -32,7 +32,9 @@ import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
 import com.seibel.distanthorizons.coreapi.util.StringUtil;
 
-public class RenderBlockCacheCsvHandler implements IConfigListener
+import java.util.Timer;
+
+public class RenderBlockCacheCsvHandler extends AbstractDelayedConfigEventHandler
 {
 	private static final DhLogger LOGGER = new DhLoggerBuilder().build();
 	
@@ -43,18 +45,22 @@ public class RenderBlockCacheCsvHandler implements IConfigListener
 	//=============//
  	// constructor //
 	//=============//
+	//region
 	
 	/** private since we only ever need one handler at a time */
-	private RenderBlockCacheCsvHandler() { }
+	private RenderBlockCacheCsvHandler() { super(AbstractDelayedConfigEventHandler.DEFAULT_TIMEOUT_IN_MS); }
+	
+	//endregion
 	
 	
 	
 	//=================//
 	// config handling //
 	//=================//
+	//region
 	
 	@Override
-	public void onConfigValueSet()
+	public void onConfigTimeout()
 	{
 		IWrapperFactory wrapperFactory = SingletonInjector.INSTANCE.get(IWrapperFactory.class);
 		if (wrapperFactory != null)
@@ -64,6 +70,8 @@ public class RenderBlockCacheCsvHandler implements IConfigListener
 		}
 	}
 	
+	//endregion
+	
 	
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/config/types/ConfigEntry.java

@@ -55,6 +55,16 @@ public class ConfigEntry<T> extends AbstractConfigBase<T>
 	@Nullable
 	private T apiValue;
 	
+	/** 
+	 * Will be null if un-set. <br> <br>
+	 * 
+	 * Some options aren't supported on all Minecraft versions,
+	 * in those cases this value will be set to override the 
+	 * config file option.
+	 */
+	@Nullable
+	private T mcVersionOverrideValue;
+	
 	
 	
 	//=============//
@@ -127,7 +137,14 @@ public class ConfigEntry<T> extends AbstractConfigBase<T>
 		return this.allowApiOverride 
 				&& this.apiValue != null; 
 	}
-		
+	
+	/** setting to null will allow the config to be used normally */
+	public void setMcVersionOverrideValue(@Nullable T value)
+	{ this.mcVersionOverrideValue = value; }
+	
+	public boolean mcVersionOverridePresent()
+	{ return this.mcVersionOverrideValue != null; }
+	
 	/** 
 	 * Should only be used when loading the config from file. <Br>
 	 * Sets the value without informing the rest of the code (ie, it doesn't call listeners, or saving the value to file).
@@ -183,6 +200,12 @@ public class ConfigEntry<T> extends AbstractConfigBase<T>
 	@Override
 	public T get()
 	{
+		// always use the MC version specific option if defined
+		if (this.mcVersionOverrideValue != null)
+		{
+			return this.mcVersionOverrideValue;
+		}
+		
 		if (this.allowApiOverride 
 			&& this.apiValue != null)
 		{

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/BufferQuad.java

@@ -59,9 +59,19 @@ public final class BufferQuad
 	
 	public boolean hasError = false;
 	
+	// Pre-computed sort keys to avoid recomputing on every comparison
+	// Slight increase in memory for reduction in cpu usage
+	public final long sortKeyEastWest;
+	public final long sortKeyNorthSouth;
 	
 	
-	BufferQuad(
+	
+	//=============//
+	// constructor //
+	//=============//
+	//region
+	
+	public BufferQuad(
 			short x, short y, short z, short widthEastWest, short widthNorthSouthOrHeight,
 			int color, byte irisBlockMaterialId, byte skylight, byte blockLight,
 			EDhDirection direction)
@@ -85,64 +95,46 @@ public final class BufferQuad
 		this.skyLight = skylight;
 		this.blockLight = blockLight;
 		this.direction = direction;
+		this.sortKeyEastWest = computeSortKey(direction, true);
+		this.sortKeyNorthSouth = computeSortKey(direction, false);
 	}
-	
-	
-	
-	/** a rough but fast calculation */
-	double calculateDistance(double relativeX, double relativeY, double relativeZ)
+	private long computeSortKey(EDhDirection dir, boolean eastWest)
 	{
-		return Math.pow(relativeX - this.x, 2) + Math.pow(relativeY - this.y, 2) + Math.pow(relativeZ - this.z, 2);
+		if (eastWest)
+		{
+			switch (dir.axis)
+			{
+				case X: return (long) x << 48 | (long) y << 32 | (long) z << 16;
+				case Y: return (long) y << 48 | (long) z << 32 | (long) x << 16;
+				case Z: return (long) z << 48 | (long) y << 32 | (long) x << 16;
+				default: throw new IllegalArgumentException("Invalid Axis enum: [" + dir.axis + "].");
+			}
+		}
+		else
+		{
+			switch (dir.axis)
+			{
+				case X: return (long) x << 48 | (long) z << 32 | (long) y << 16;
+				case Y: return (long) y << 48 | (long) x << 32 | (long) z << 16;
+				case Z: return (long) z << 48 | (long) x << 32 | (long) y << 16;
+				default: throw new IllegalArgumentException("Invalid Axis enum: [" + dir.axis + "].");
+			}
+		}
 	}
 	
-	/** compares this quad's position to the given quad */
+	//endregion
+	
+	
+	
+	/** compares this quad's position to the given quad using pre-computed sort keys */
 	public int compare(BufferQuad quad, BufferMergeDirectionEnum compareDirection)
 	{
 		if (this.direction != quad.direction)
 			throw new IllegalArgumentException("The other quad is not in the same direction: " + quad.direction + " vs " + this.direction);
 		
-		if (compareDirection == BufferMergeDirectionEnum.EastWest)
-		{
-			switch (this.direction.axis)
-			{
-				case X:
-					return threeDimensionalCompare(this.x, this.y, this.z, quad.x, quad.y, quad.z);
-				case Y:
-					return threeDimensionalCompare(this.y, this.z, this.x, quad.y, quad.z, quad.x);
-				case Z:
-					return threeDimensionalCompare(this.z, this.y, this.x, quad.z, quad.y, quad.x);
-				
-				default:
-					throw new IllegalArgumentException("Invalid Axis enum: [" + this.direction.axis + "].");
-			}
-		}
-		else
-		{
-			switch (this.direction.axis)
-			{
-				case X:
-					return threeDimensionalCompare(this.x, this.z, this.y, quad.x, quad.z, quad.y);
-				case Y:
-					return threeDimensionalCompare(this.y, this.x, this.z, quad.y, quad.x, quad.z);
-				case Z:
-					return threeDimensionalCompare(this.z, this.x, this.y, quad.z, quad.x, quad.y);
-				
-				default:
-					throw new IllegalArgumentException("Invalid Axis enum: [" + this.direction.axis + "].");
-			}
-		}
-	}
-	/**
-	 * Compares two 3D points A and B. <br>
-	 * The X, Y, and Z coordinates can be passed into parameters 0, 1, and 2 in any order
-	 * provided they are in the same order for both A and B. <br>
-	 * With the 0th parameter being the most significant when comparing.
-	 */
-	private static int threeDimensionalCompare(short a0, short a1, short a2, short b0, short b1, short b2)
-	{
-		long a = (long) a0 << 48 | (long) a1 << 32 | (long) a2 << 16;
-		long b = (long) b0 << 48 | (long) b1 << 32 | (long) b2 << 16;
-		return Long.compare(a, b);
+		return compareDirection == BufferMergeDirectionEnum.EastWest
+			? Long.compare(this.sortKeyEastWest, quad.sortKeyEastWest)
+			: Long.compare(this.sortKeyNorthSouth, quad.sortKeyNorthSouth);
 	}
 	
 	
@@ -154,11 +146,15 @@ public final class BufferQuad
 	public boolean tryMerge(BufferQuad quad, BufferMergeDirectionEnum mergeDirection)
 	{
 		if (quad.hasError || this.hasError)
+		{
 			return false;
+		}
 		
 		// only merge quads that are in the same direction
 		if (this.direction != quad.direction)
+		{
 			return false;
+		}
 		
 		// make sure these quads share the same perpendicular axis
 		if ((mergeDirection == BufferMergeDirectionEnum.EastWest && this.y != quad.y)
@@ -175,7 +171,6 @@ public final class BufferQuad
 		short otherParallelCompareStartPos;
 		switch (this.direction.axis)
 		{
-			default: // shouldn't normally happen, just here to make the compiler happy
 			case X:
 				if (mergeDirection == BufferMergeDirectionEnum.EastWest)
 				{
@@ -232,6 +227,9 @@ public final class BufferQuad
 					otherParallelCompareStartPos = quad.z;
 				}
 				break;
+			
+			default: // shouldn't normally happen, just here to make the compiler happy
+				throw new IllegalArgumentException("Unsupported axis: ["+this.direction.axis+"]");
 		}
 		
 		// get the width of this quad in the relevant axis
@@ -333,4 +331,6 @@ public final class BufferQuad
 		return true;
 	}
 	
+	
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/ColumnBox.java

@@ -24,6 +24,7 @@ import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.enums.EDhDirection;
 import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.util.objects.pooling.PhantomArrayListCheckout;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.coreapi.util.ColorUtil;
 import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.util.RenderDataPointUtil;
@@ -60,6 +61,12 @@ public class ColumnBox
 		// variable setup //
 		//================//
 		
+		IClientLevelWrapper clientLevelWrapper = clientLevel.getClientLevelWrapper();
+		if (clientLevelWrapper == null)
+		{
+			LodUtil.assertNotReach("addBoxQuadsToBuilder getClientLevelWrapper should always succeed");
+		}
+		
 		short maxX = (short) (minX + width);
 		short maxY = (short) (minY + yHeight);
 		short maxZ = (short) (minZ + width);
@@ -122,7 +129,7 @@ public class ColumnBox
 					&& !isTopTransparent;
 			if (!skipTop)
 			{
-				builder.addQuadUp(minX, maxY, minZ, width, ColorUtil.applyShade(color, MC_RENDER.getShade(EDhDirection.UP)), irisBlockMaterialId, skyLightTop, blockLight);
+				builder.addQuadUp(minX, maxY, minZ, width, ColorUtil.applyShade(color, clientLevelWrapper.getShade(EDhDirection.UP)), irisBlockMaterialId, skyLightTop, blockLight);
 			}
 		}
 		
@@ -133,7 +140,7 @@ public class ColumnBox
 					&& !isBottomTransparent;
 			if (!skipBottom)
 			{
-				builder.addQuadDown(minX, minY, minZ, width, ColorUtil.applyShade(color, MC_RENDER.getShade(EDhDirection.DOWN)), irisBlockMaterialId, skyLightBot, blockLight);
+				builder.addQuadDown(minX, minY, minZ, width, ColorUtil.applyShade(color, clientLevelWrapper.getShade(EDhDirection.DOWN)), irisBlockMaterialId, skyLightBot, blockLight);
 			}
 		}
 		
@@ -163,7 +170,7 @@ public class ColumnBox
 			else
 			{
 				makeAdjVerticalQuad(
-						builder, phantomArrayCheckout, 
+						builder, phantomArrayCheckout, clientLevelWrapper,
 						adjCol, adjSameDetailLevel, caveCullingMaxY, EDhDirection.NORTH, 
 						minX, minY, minZ, width, yHeight,
 						color, irisBlockMaterialId, blockLight);
@@ -188,7 +195,7 @@ public class ColumnBox
 			else
 			{
 				makeAdjVerticalQuad(
-						builder, phantomArrayCheckout,
+						builder, phantomArrayCheckout, clientLevelWrapper,
 						adjCol, adjSameDetailLevel, caveCullingMaxY, EDhDirection.SOUTH,
 						minX, minY, maxZ, width, yHeight,
 						color, irisBlockMaterialId, blockLight);
@@ -213,7 +220,7 @@ public class ColumnBox
 			else
 			{
 				makeAdjVerticalQuad(
-						builder, phantomArrayCheckout,
+						builder, phantomArrayCheckout, clientLevelWrapper,
 						adjCol, adjSameDetailLevel, caveCullingMaxY, EDhDirection.WEST, 
 						minX, minY, minZ, width, yHeight,
 						color, irisBlockMaterialId, blockLight);
@@ -238,7 +245,7 @@ public class ColumnBox
 			else
 			{
 				makeAdjVerticalQuad(
-						builder, phantomArrayCheckout,
+						builder, phantomArrayCheckout, clientLevelWrapper,
 						adjCol, adjSameDetailLevel, caveCullingMaxY, EDhDirection.EAST, 
 						maxX, minY, minZ, width, yHeight,
 						color, irisBlockMaterialId, blockLight);
@@ -247,7 +254,7 @@ public class ColumnBox
 	}
 	
 	private static void makeAdjVerticalQuad(
-		LodQuadBuilder builder, PhantomArrayListCheckout phantomArrayCheckout,
+		LodQuadBuilder builder, PhantomArrayListCheckout phantomArrayCheckout, IClientLevelWrapper clientLevelWrapper,
 		@NotNull ColumnRenderView adjColumnView, boolean adjacentIsSameDetailLevel, int caveCullingMaxY, EDhDirection direction,
 		short x, short yMin, short z, short horizontalWidth, short ySize,
 		int color, byte irisBlockMaterialId, byte blockLight)
@@ -263,7 +270,7 @@ public class ColumnBox
 		// no adjacent data //
 		//==================//
 		
-		color = ColorUtil.applyShade(color, MC_RENDER.getShade(direction));
+		color = ColorUtil.applyShade(color, clientLevelWrapper.getShade(direction));
 		
 		if (adjColumnView.size == 0
 			|| RenderDataPointUtil.hasZeroHeight(adjColumnView.get(0)))
@@ -341,13 +348,24 @@ public class ColumnBox
 			
 			
 			// Apply light to the range [adjMinY, adjMaxY)
-			applyLightToRange(segments, newSegments, adjMinY, adjMaxY, lightToApply);
+			applyLightToRangeAndPopulateNewSgements(segments, newSegments, adjMinY, adjMaxY, lightToApply);
+			{
+				// swap references so we can use the newly populated segments
+				LongArrayList temp = segments;
+				segments = newSegments;
+				newSegments = temp;
+			}
 			
 			// Fill overhang area [adjMaxY, adjAboveMinY) with adjSkyLight
 			short adjAboveMinY = RenderDataPointUtil.getYMin(adjAbovePoint);
 			if (adjMaxY < adjAboveMinY)
 			{
-				applyLightToRange(segments, newSegments, adjMaxY, adjAboveMinY, adjSkyLight);
+				applyLightToRangeAndPopulateNewSgements(segments, newSegments, adjMaxY, adjAboveMinY, adjSkyLight);
+				{
+					LongArrayList temp = segments;
+					segments = newSegments;
+					newSegments = temp;
+				}
 			}
 		}
 		
@@ -373,10 +391,11 @@ public class ColumnBox
 	/**
 	 * Apply the new light value over the given y range,
 	 * splitting segments as needed
+	 * and putting the new segments into "newSegments"
 	 * <p>
 	 * source: claude.ai
 	 */
-	private static void applyLightToRange(
+	private static void applyLightToRangeAndPopulateNewSgements(
 			LongArrayList segments, LongArrayList newSegments, 
 			short rangeStart, short rangeEnd, 
 			byte newLight)
@@ -419,9 +438,6 @@ public class ColumnBox
 				newSegments.add(YSegmentUtil.encode(rangeEnd, endY, skyLight));
 			}
 		}
-		
-		segments.clear();
-		segments.addAll(newSegments);
 	}
 	
 	private static void tryAddVerticalFaceWithSkyLightToBuilder(

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/ColumnRenderBufferBuilder.java

@@ -55,26 +55,6 @@ public class ColumnRenderBufferBuilder
 	// vbo building //
 	//==============//
 	
-	/** @link adjData should be null for adjacent sections that cross detail level boundaries */
-	public static CompletableFuture<LodBufferContainer> uploadBuffersAsync(
-			IDhClientLevel clientLevel,
-			long pos,
-			LodQuadBuilder quadBuilder
-		)
-	{
-		DhBlockPos minBlockPos = new DhBlockPos(DhSectionPos.getMinCornerBlockX(pos), clientLevel.getLevelWrapper().getMinHeight(), DhSectionPos.getMinCornerBlockZ(pos));
-		LodBufferContainer bufferContainer = new LodBufferContainer(pos, minBlockPos);
-		CompletableFuture<LodBufferContainer> uploadFuture = bufferContainer.tryMakeAndUploadBuffersAsync(quadBuilder);
-		uploadFuture.whenComplete((uploadedBuffer, exception) -> 
-		{
-			// clean up if not uploaded
-			if (uploadedBuffer != null && !uploadedBuffer.buffersUploaded)
-			{
-				uploadedBuffer.close();
-			}
-		});
-		return uploadFuture;
-	}
 	public static void makeLodRenderData(
 			LodQuadBuilder quadBuilder, ColumnRenderSource renderSource, IDhClientLevel clientLevel,
 			ColumnRenderSource[] adjRegions, boolean[] isSameDetailLevel)

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/LodBufferContainer.java

@@ -20,13 +20,13 @@
 package com.seibel.distanthorizons.core.dataObjects.render.bufferBuilding;
 
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.logging.DhLogger;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.render.RenderThreadTaskHandler;
 import com.seibel.distanthorizons.core.util.ExceptionUtil;
-import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.AbstractDhRenderApiDefinition;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.objects.ILodContainerUniformBufferWrapper;
@@ -37,7 +37,6 @@ import org.lwjgl.system.MemoryUtil;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.concurrent.*;
-import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Java representation of one or more OpenGL buffers for rendering.
@@ -63,8 +62,6 @@ public class LodBufferContainer implements AutoCloseable
 	
 	public ILodContainerUniformBufferWrapper uniformContainer = WRAPPER_FACTORY.createLodContainerUniformWrapper();
 	
-	private final AtomicReference<CompletableFuture<LodBufferContainer>> uploadFutureRef = new AtomicReference<>(null);
-	
 	
 	
 	//==============//
@@ -72,7 +69,7 @@ public class LodBufferContainer implements AutoCloseable
 	//==============//
 	//region
 	
-	public LodBufferContainer(long pos, DhBlockPos minCornerBlockPos)
+	private LodBufferContainer(long pos, DhBlockPos minCornerBlockPos)
 	{
 		this.pos = pos;
 		this.minCornerBlockPos = minCornerBlockPos;
@@ -92,41 +89,12 @@ public class LodBufferContainer implements AutoCloseable
 	//region
 	
 	/** Should be run on a DH thread. */
-	public synchronized CompletableFuture<LodBufferContainer> tryMakeAndUploadBuffersAsync(LodQuadBuilder builder)
+	public static CompletableFuture<LodBufferContainer> tryMakeAndUploadBuffersAsync(
+		long pos, IDhClientLevel clientLevel,
+		LodQuadBuilder builder)
 	{
-		//================//
-		// handle futures //
-		//================//
-		//region
-		
-		// separate variable to prevent race condition when checking null
-		CompletableFuture<LodBufferContainer> oldFuture = this.uploadFutureRef.get();
-		if (oldFuture != null)
-		{
-			// upload already in process
-			return oldFuture;
-		}
-		
 		// new upload needed
 		CompletableFuture<LodBufferContainer> future = new CompletableFuture<>();
-		future.handle((lodBufferContainer, throwable) -> 
-		{
-			if (!this.uploadFutureRef.compareAndSet(future, null))
-			{
-				LOGGER.warn("upload future ref changed for pos ["+DhSectionPos.toString(this.pos)+"].");
-			}
-			
-			return null;
-		});
-		
-		if (!this.uploadFutureRef.compareAndSet(null, future))
-		{
-			oldFuture = this.uploadFutureRef.get();
-			LodUtil.assertTrue(oldFuture != null, "Concurrency error");
-			return oldFuture;
-		}
-		
-		//endregion
 		
 		
 		
@@ -135,91 +103,119 @@ public class LodBufferContainer implements AutoCloseable
 		//================//
 		//region
 		
+		DhBlockPos minCornerBlockPos = new DhBlockPos(
+			DhSectionPos.getMinCornerBlockX(pos),
+			clientLevel.getLevelWrapper().getMinHeight(),
+			DhSectionPos.getMinCornerBlockZ(pos));
+		LodBufferContainer bufferContainer = new LodBufferContainer(pos, minCornerBlockPos);
+		
+		// create CPU vertex buffers
 		ArrayList<ByteBuffer> opaqueBuffers = builder.makeOpaqueVertexBuffers();
 		ArrayList<ByteBuffer> transparentBuffers = builder.makeTransparentVertexBuffers();
 		
-		this.vboOpaqueWrappers = resizeWrapperArray(this.vboOpaqueWrappers, opaqueBuffers.size());
-		this.vboTransparentWrappers = resizeWrapperArray(this.vboTransparentWrappers, transparentBuffers.size());
+		// update arrays to contain buffers
+		bufferContainer.vboOpaqueWrappers = resizeWrapperArray(bufferContainer.vboOpaqueWrappers, opaqueBuffers.size());
+		bufferContainer.vboTransparentWrappers = resizeWrapperArray(bufferContainer.vboTransparentWrappers, transparentBuffers.size());
 		
-		// mac requires separate IBO objects for each VBO when using OpenGL,
+		// create CPU index buffers if needed.
+		// Mac requires separate IBO objects for each VBO when using OpenGL,
 		// all other OS's can share a single IBO for quicker loading times
 		boolean useSingleIbo = RENDER_DEF.useSingleIbo();
-		@Nullable ArrayList<ByteBuffer> opaqueIndexBuffers = useSingleIbo ? null : this.createIndexBuffers(opaqueBuffers);
-		@Nullable ArrayList<ByteBuffer> transparentIndexBuffers = useSingleIbo ? null : this.createIndexBuffers(transparentBuffers);
+		@Nullable ArrayList<ByteBuffer> opaqueIndexBuffers = useSingleIbo ? null : bufferContainer.createIndexBuffers(opaqueBuffers);
+		@Nullable ArrayList<ByteBuffer> transparentIndexBuffers = useSingleIbo ? null : bufferContainer.createIndexBuffers(transparentBuffers);
 		
 		//endregion
 		
 		
 		
-		//================//
-		// upload buffers //
-		//================//
-		//region
+		//=============//
+		// create VBOs //
+		//=============//
+		//region	
 		
-		try
+		CompletableFuture<Void> createFuture = new CompletableFuture<Void>();
+		RenderThreadTaskHandler.INSTANCE.queueRunningOnRenderThread("LodBufferContainer Setup", () ->
 		{
-			//=============//
-			// create VBOs //
-			//=============//
-			
-			CompletableFuture<Void> createOpaqueFuture = createBufferWrappersAsync(future, this.vboOpaqueWrappers, opaqueBuffers);
-			CompletableFuture<Void> createTransparentFuture = createBufferWrappersAsync(future, this.vboTransparentWrappers, transparentBuffers);
-			
-			CompletableFuture<Void> createFuture = CompletableFuture.allOf(createOpaqueFuture, createTransparentFuture);
-			createFuture.exceptionally((Throwable e) ->
+			try
 			{
-				// create VBOs failed //
+				// skip this event if requested
+				if (Thread.interrupted()
+					|| future.isCancelled())
+				{
+					throw new InterruptedException();
+				}
 				
+				createBufferWrappers(bufferContainer.vboOpaqueWrappers, opaqueBuffers);
+				createBufferWrappers(bufferContainer.vboTransparentWrappers, transparentBuffers);
+				
+				createFuture.complete(null);
+			}
+			catch (Exception e)
+			{
 				if (!ExceptionUtil.isShutdownException(e))
 				{
-					LOGGER.error("Unexpected issue creating buffer [" + this.minCornerBlockPos + "], error: [" + e.getMessage() + "].", e);
+					LOGGER.error("Unexpected issue creating buffers for pos: ["+DhSectionPos.toString(bufferContainer.pos)+"], error: ["+e.getMessage()+"].", e);
 				}
+
+				bufferContainer.close();
+				createFuture.completeExceptionally(e);
+			}
+		});
+		
+		//endregion
+		
+		
+		
+		//====================//
+		// upload VBOs to GPU //
+		//====================//
+		//region
+		
+		createFuture.exceptionally((Throwable e) ->
+		{
+			// create VBOs failed //
+			if (!ExceptionUtil.isShutdownException(e))
+			{
+				LOGGER.error("Unexpected issue creating buffer [" + bufferContainer.minCornerBlockPos + "], error: [" + e.getMessage() + "].", e);
+			}
+			
+			bufferContainer.close();
+			future.completeExceptionally(e);
+			return null;
+		});
+		createFuture.thenRun(() ->
+		{
+			CompletableFuture<Void> opaqueFuture = uploadBuffersAsync(future, bufferContainer.vboOpaqueWrappers, opaqueBuffers, opaqueIndexBuffers);
+			CompletableFuture<Void> transparentFuture = uploadBuffersAsync(future, bufferContainer.vboTransparentWrappers, transparentBuffers, transparentIndexBuffers);
+			CompletableFuture<Void> uploadFuture = CompletableFuture.allOf(opaqueFuture, transparentFuture);
+			uploadFuture.exceptionally((Throwable e) ->
+			{
+				// upload failed //
+				if (!ExceptionUtil.isShutdownException(e))
+				{
+					LOGGER.error("Unexpected issue uploading buffer [" + bufferContainer.minCornerBlockPos + "], error: [" + e.getMessage() + "].", e);
+				}
+				
+				bufferContainer.close();
 				future.completeExceptionally(e);
 				return null;
 			});
-			createFuture.thenRun(() ->
+			uploadFuture.thenRun(() ->
 			{
-				//=============//
-				// upload VBOs //
-				//=============//
-				
-				CompletableFuture<Void> opaqueFuture = uploadBuffersAsync(future, this.vboOpaqueWrappers, opaqueBuffers, opaqueIndexBuffers);
-				CompletableFuture<Void> transparentFuture = uploadBuffersAsync(future, this.vboTransparentWrappers, transparentBuffers, transparentIndexBuffers);
-				
-				CompletableFuture<Void> uploadFuture = CompletableFuture.allOf(opaqueFuture, transparentFuture);
-				uploadFuture.exceptionally((Throwable e) ->
-				{
-					// upload failed //
-					
-					if (!ExceptionUtil.isShutdownException(e))
-					{
-						LOGGER.error("Unexpected issue uploading buffer [" + this.minCornerBlockPos + "], error: [" + e.getMessage() + "].", e);
-					}
-					future.completeExceptionally(e);
-					return null;
-				});
-				uploadFuture.thenRun(() ->
-				{
-					// upload success /
-					
-					this.buffersUploaded = true;
-					future.complete(this);
-				});
+				// upload success //
+				bufferContainer.buffersUploaded = true;
+				future.complete(bufferContainer);
 			});
-		}
-		catch (Exception e)
-		{
-			if (!ExceptionUtil.isShutdownException(e))
-			{
-				LOGGER.error("Unexpected issue prepping buffer uploading [" + this.minCornerBlockPos + "], error: [" + e.getMessage() + "].", e);
-			}
-			future.completeExceptionally(e);
-		}
+		});
+		
+		//endregion
 		
 		
-		//================//
-		// buffer cleanup //
-		//================//
+		
+		//====================//
+		// CPU Buffer cleanup //
+		//====================//
+		//region
 		
 		future.whenComplete((LodBufferContainer lodBufferContainer, Throwable throwable) -> 
 		{
@@ -290,11 +286,8 @@ public class LodBufferContainer implements AutoCloseable
 		return newVbos;
 	}
 	
-	private static CompletableFuture<Void> createBufferWrappersAsync(
-		CompletableFuture<LodBufferContainer> parentFuture, 
-		IVertexBufferWrapper[] vboWrappers, ArrayList<ByteBuffer> vertexBuffers)
+	private static void createBufferWrappers(IVertexBufferWrapper[] vboWrappers, ArrayList<ByteBuffer> vertexBuffers)
 	{
-		ArrayList<CompletableFuture<Void>> createVboFutureList = new ArrayList<>();
 		for (int i = 0; i < vertexBuffers.size(); i++)
 		{
 			if (i >= vboWrappers.length)
@@ -304,45 +297,9 @@ public class LodBufferContainer implements AutoCloseable
 			
 			if (vboWrappers[i] == null)
 			{
-				final int finalVboIndex = i;
-				
-				CompletableFuture<Void> future = new CompletableFuture<>();
-				createVboFutureList.add(future);
-				
-				RenderThreadTaskHandler.INSTANCE.queueRunningOnRenderThread("LodBufferContainer Setup", () ->
-				{
-					try
-					{
-						// skip this event if requested
-						if (Thread.interrupted()
-							|| parentFuture.isCancelled())
-						{
-							throw new InterruptedException();
-						}
-						
-						
-						vboWrappers[finalVboIndex] = WRAPPER_FACTORY.createVboWrapper("distantHorizons:McLodRenderer");
-						future.complete(null);
-					}
-					catch (Exception e)
-					{
-						future.completeExceptionally(e);
-					}
-				});
+				vboWrappers[i] = WRAPPER_FACTORY.createVboWrapper("distantHorizons:McLodRenderer");
 			}
 		}
-		
-		if (createVboFutureList.size() == 0)
-		{
-			return CompletableFuture.completedFuture(null);
-		}
-		
-		CompletableFuture<?>[] futureArray = new CompletableFuture[createVboFutureList.size()];
-		for (int i = 0; i < createVboFutureList.size(); i++)
-		{
-			futureArray[i] = createVboFutureList.get(i);
-		}
-		return CompletableFuture.allOf(futureArray);
 	}
 	
 	/** Index buffers should be null if {@link AbstractDhRenderApiDefinition#useSingleIbo()} returns true. */
@@ -365,8 +322,6 @@ public class LodBufferContainer implements AutoCloseable
 			
 			// final variables for use in lambdas //
 			
-			final int finalVboIndex = vboIndex;
-			
 			final IVertexBufferWrapper finalVboWrapper = vboWrappers[vboIndex];
 			
 			final ByteBuffer finalVertexBuffer = vertexBuffers.get(vboIndex);
@@ -385,6 +340,8 @@ public class LodBufferContainer implements AutoCloseable
 			CompletableFuture<Void> vertexUploadFuture = new CompletableFuture<>();
 			uploadFutureList.add(vertexUploadFuture);
 			
+			
+			final StackTraceElement[] stackTraceElements = Thread.currentThread().getStackTrace();
 			RenderThreadTaskHandler.INSTANCE.queueRunningOnRenderThread("LodBufferContainer VBO Upload", () ->
 			{
 				try
@@ -396,21 +353,12 @@ public class LodBufferContainer implements AutoCloseable
 						throw new InterruptedException();
 					}
 					
-					
-					try
-					{
-						finalVboWrapper.uploadVertexBuffer(finalVertexBuffer, finalVertexCount);
-						vertexUploadFuture.complete(null);
-					}
-					catch (Exception e)
-					{
-						vboWrappers[finalVboIndex] = null;
-						finalVboWrapper.close();
-						LOGGER.error("Failed to upload buffer. Error: [" + e.getMessage() + "].", e);
-					}
+					finalVboWrapper.uploadVertexBuffer(finalVertexBuffer, finalVertexCount);
+					vertexUploadFuture.complete(null);
 				}
 				catch (Exception e)
 				{
+					LOGGER.error("Failed to upload buffer. Error: [" + e.getMessage() + "].", e);
 					vertexUploadFuture.completeExceptionally(e);
 				}
 			});
@@ -445,6 +393,7 @@ public class LodBufferContainer implements AutoCloseable
 					}
 					catch (Exception e)
 					{
+						finalVboWrapper.close();
 						indexUploadFuture.completeExceptionally(e);
 					}
 				});
@@ -532,26 +481,29 @@ public class LodBufferContainer implements AutoCloseable
 		
 		RenderThreadTaskHandler.INSTANCE.queueRunningOnRenderThread("LodBufferContainer Close", () -> 
 		{
-			for (IVertexBufferWrapper buffer : this.vboOpaqueWrappers)
-			{
-				if (buffer != null)
-				{
-					buffer.close();
-				}
-			}
-			
-			for (IVertexBufferWrapper buffer : this.vboTransparentWrappers)
-			{
-				if (buffer != null)
-				{
-					buffer.close();
-				}
-			}
+			tryCloseBufferWrapperArray(this.vboOpaqueWrappers);
+			tryCloseBufferWrapperArray(this.vboTransparentWrappers);
 			
 			this.uniformContainer.close();
 		});
 	}
 	
+	private static void tryCloseBufferWrapperArray(@Nullable IVertexBufferWrapper[] bufferWrappers)
+	{
+		if (bufferWrappers != null)
+		{
+			for (int i = 0; i < bufferWrappers.length; i++)
+			{
+				IVertexBufferWrapper buffer = bufferWrappers[i];
+				bufferWrappers[i] = null;
+				if (buffer != null)
+				{
+					buffer.close();
+				}
+			}
+		}
+	}
+	
 	//endregion
 	
 	

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/render/bufferBuilding/LodQuadBuilder.java

@@ -61,7 +61,7 @@ public class LodQuadBuilder
 	public static final int BYTES_PER_QUAD = BYTES_PER_VERTEX * 4;
 	
 	public static final int[][][] DIRECTION_VERTEX_IBO_QUAD = new int[][][]
-	///region
+	//region
 		{
 			// X,Z //
 			{ // UP
@@ -109,7 +109,7 @@ public class LodQuadBuilder
 				{0, 0}, // 3
 			},
 		};
-	///endregion
+	//endregion
 	
 	private int premergeCount = 0;
 	
@@ -394,7 +394,7 @@ public class LodQuadBuilder
 								// for horizontal and bottom faces of grass blocks, use the  dirt color to
 								// prevent green cliff walls
 								color = this.clientLevelWrapper.getDirtBlockColor();
-								color = ColorUtil.applyShade(color, MC_RENDER.getShade(quad.direction));
+								color = ColorUtil.applyShade(color, this.clientLevelWrapper.getShade(quad.direction));
 							}
 						}
 					}

core/src/main/java/com/seibel/distanthorizons/core/dataObjects/transformers/FullDataToRenderDataTransformer.java

@@ -129,6 +129,7 @@ public class FullDataToRenderDataTransformer
 			ColumnRenderView tempExpandingColumnView = ColumnRenderView.getPooled();
 			RenderDataPointReducingList reducingList = new RenderDataPointReducingList())
 		{
+			DhBlockPosMutable mutableBlockPos = new DhBlockPosMutable();
 			for (int x = 0; x < FullDataSourceV2.WIDTH; x++)
 			{
 				for (int z = 0; z < FullDataSourceV2.WIDTH; z++)
@@ -142,7 +143,7 @@ public class FullDataToRenderDataTransformer
 						baseX + BitShiftUtil.pow(x, dataDetail), baseZ + BitShiftUtil.pow(z, dataDetail),
 						columnArrayView, dataColumn,
 						// pooled references so we don't need to re-allocate/get them 4000 times per render source
-						phantomCheckout, tempExpandingColumnView, reducingList);
+						phantomCheckout, tempExpandingColumnView, reducingList, mutableBlockPos);
 				}
 			}
 		}
@@ -157,7 +158,7 @@ public class FullDataToRenderDataTransformer
 			ColumnRenderView columnArrayView, 
 			LongArrayList fullDataColumn,
 			// pooled references
-			PhantomArrayListCheckout phantomCheckout, ColumnRenderView tempExpandingColumnView, RenderDataPointReducingList reducingList)
+			PhantomArrayListCheckout phantomCheckout, ColumnRenderView tempExpandingColumnView, RenderDataPointReducingList reducingList, DhBlockPosMutable mutableBlockPos)
 	{
 		// we can't do anything if the full data is missing or empty
 		if (fullDataColumn == null 
@@ -170,7 +171,7 @@ public class FullDataToRenderDataTransformer
 		if (fullDataLength <= columnArrayView.maxVerticalSliceCount)
 		{
 			// Directly use the arrayView since it fits.
-			setRenderColumnView(levelWrapper, fullDataSource, blockX, blockZ, columnArrayView, fullDataColumn);
+			setRenderColumnView(levelWrapper, fullDataSource, blockX, blockZ, columnArrayView, fullDataColumn, mutableBlockPos);
 		}
 		else
 		{
@@ -178,7 +179,7 @@ public class FullDataToRenderDataTransformer
 			
 			// expand the ColumnArrayView to fit the new larger max vertical size
 			tempExpandingColumnView.populate(dataArrayList, fullDataLength, 0, fullDataLength);
-			setRenderColumnView(levelWrapper, fullDataSource, blockX, blockZ, tempExpandingColumnView, fullDataColumn);
+			setRenderColumnView(levelWrapper, fullDataSource, blockX, blockZ, tempExpandingColumnView, fullDataColumn, mutableBlockPos);
 			
 			columnArrayView.changeVerticalSizeFrom(tempExpandingColumnView, reducingList);
 		}
@@ -186,7 +187,7 @@ public class FullDataToRenderDataTransformer
 	private static void setRenderColumnView(
 			IClientLevelWrapper levelWrapper, FullDataSourceV2 fullDataSource,
 			int blockX, int blockZ,
-			ColumnRenderView renderColumnData, LongArrayList fullColumnData)
+			ColumnRenderView renderColumnData, LongArrayList fullColumnData, DhBlockPosMutable mutableBlockPos)
 	{
 		//===============//
 		// config values //
@@ -242,7 +243,8 @@ public class FullDataToRenderDataTransformer
 		
 		FullDataPointIdMap fullDataMapping = fullDataSource.mapping;
 		
-		DhBlockPosMutable mutableBlockPos = new DhBlockPosMutable(blockX, 0, blockZ);
+		mutableBlockPos.setX(blockX);
+		mutableBlockPos.setZ(blockZ);
 		
 		// goes from the top down
 		for (int fullDataIndex = 0; fullDataIndex < fullColumnData.size(); fullDataIndex++)
@@ -450,8 +452,17 @@ public class FullDataToRenderDataTransformer
 				// use the previous block's color
 				color = colorToApplyToNextBlock;
 				colorToApplyToNextBlock = -1;
-				skyLight = skylightToApplyToNextBlock;
-				blockLight = blocklightToApplyToNextBlock;
+				
+				// use the skylight override if present
+				if (skylightToApplyToNextBlock != -1)
+				{
+					skyLight = skylightToApplyToNextBlock;
+				}
+				
+				if (blocklightToApplyToNextBlock != -1)
+				{
+					blockLight = blocklightToApplyToNextBlock;
+				}
 			}
 			
 			

core/src/main/java/com/seibel/distanthorizons/core/generation/queues/LodRequestModule.java

@@ -91,10 +91,27 @@ public class LodRequestModule implements Closeable
 	{
 		try
 		{
+			// Initial wait is to prevent an issue
+			// where this starts before the child object's constructor finishes,
+			// causing null pointers on final non-null references.
+			// The try-catch in the while loop should also handle this
+			// but this way we shouldn't have error logs.
+			Thread.sleep(500);
+			
+			// run until the threadpool is shut down
 			while (!Thread.interrupted())
 			{
-				Thread.sleep(20);
-				this.tick();
+				try
+				{
+					Thread.sleep(20);
+					
+					this.tick();
+				}
+				catch (InterruptedException e) { throw e; }
+				catch (Exception e)
+				{
+					LOGGER.error("Unexpected error in [" + LodRequestModule.class.getSimpleName() + "] tick loop, error: [" + e.getMessage() + "].", e);
+				}
 			}
 		}
 		catch (InterruptedException ignore) { }
@@ -104,18 +121,7 @@ public class LodRequestModule implements Closeable
 		boolean shouldDoWorldGen = this.onWorldGenCompleteListener.shouldDoWorldGen();
 		
 		// if the world is read only don't generate anything
-		shouldDoWorldGen &= !DhApiWorldProxy.INSTANCE.getReadOnly();
-		
-		// don't generate chunks for client levels that aren't being rendered
-		// (this can happen when moving between dimensions)
-		if (this.level instanceof IDhClientLevel)
-		{
-			boolean isRendering = ((IDhClientLevel) this.level).isRendering();
-			if (!isRendering)
-			{
-				shouldDoWorldGen = false;
-			}
-		}
+		shouldDoWorldGen &= !DhApiWorldProxy.INSTANCE.tryGetReadOnly();
 		
 		
 		

core/src/main/java/com/seibel/distanthorizons/core/generation/queues/WorldGenerationQueue.java

@@ -202,7 +202,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 	private synchronized void tryQueueNewWorldGenRequestsAsync()
 	{
 		if (!DhApiWorldProxy.INSTANCE.worldLoaded()
-			|| DhApiWorldProxy.INSTANCE.getReadOnly())
+			|| DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return;
 		}

core/src/main/java/com/seibel/distanthorizons/core/level/AbstractDhServerLevel.java

@@ -9,7 +9,6 @@ import com.seibel.distanthorizons.core.multiplayer.server.FullDataSourceRequestH
 import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerState;
 import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerStateManager;
 import com.seibel.distanthorizons.core.network.exceptions.RequestOutOfRangeException;
-import com.seibel.distanthorizons.core.network.exceptions.RequestRejectedException;
 import com.seibel.distanthorizons.core.network.exceptions.SectionRequiresSplittingException;
 import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
 import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
@@ -200,26 +199,6 @@ public abstract class AbstractDhServerLevel extends AbstractDhLevel implements I
 		
 		LodUtil.assertTrue(message.getSession().serverPlayer != null);
 		
-		// Check if the player is in this dimension,
-		// since handling multiple dimensions isn't allowed
-		if (message.getSession().serverPlayer.getLevel() != this.getLevelWrapper())
-		{
-			// If the message can be replied to - reply with an error, otherwise just ignore
-			if (message instanceof AbstractTrackableMessage)
-			{
-				((AbstractTrackableMessage) message).sendResponse(
-						new RequestRejectedException(
-								"Generation not allowed. " +
-										"Requested dimension: ["+((ILevelRelatedMessage) message).getLevelName()+"], " +
-										"player dimension: [" + message.getSession().serverPlayer.getLevel().getDhIdentifier() + "], " +
-										"handler dimension: [" + this.getLevelWrapper().getDhIdentifier() + "]"
-						)
-				);
-			}
-			
-			return false;
-		}
-		
 		return true;
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/level/ClientLevelModule.java

@@ -21,16 +21,21 @@ package com.seibel.distanthorizons.core.level;
 
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.dependencyInjection.ModAccessorInjector;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.file.fullDatafile.IDataSourceUpdateListenerFunc;
 import com.seibel.distanthorizons.core.file.fullDatafile.V2.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.render.QuadTree.LodQuadTree;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.core.util.math.Vec3d;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor.IImmersivePortalsAccessor;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.renderPass.IDhGenericRenderer;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.core.logging.DhLogger;
@@ -44,6 +49,7 @@ public class ClientLevelModule implements Closeable, IDataSourceUpdateListenerFu
 {
 	private static final DhLogger LOGGER = new DhLoggerBuilder().build();
 	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	private static final IMinecraftRenderWrapper MC_RENDER = SingletonInjector.INSTANCE.get(IMinecraftRenderWrapper.class);
 	private static final IWrapperFactory WRAPPER_FACTORY = SingletonInjector.INSTANCE.get(IWrapperFactory.class);
 	
 	private final IDhClientLevel clientLevel;
@@ -106,7 +112,10 @@ public class ClientLevelModule implements Closeable, IDataSourceUpdateListenerFu
 			this.ClientRenderStateRef.set(clientRenderState);
 		}
 		
-		clientRenderState.quadtree.tryTick(new DhBlockPos2D(MC_CLIENT.getPlayerBlockPos()));
+		// use camera position instead of player pos so free cam mods work better
+		Vec3d cameraDoublePos = MC_RENDER.getCameraExactPosition();
+		DhBlockPos2D cameraBlockPos = new DhBlockPos2D((int)cameraDoublePos.x, (int)cameraDoublePos.z);
+		clientRenderState.quadtree.tryTick(cameraBlockPos);
 	}
 	
 	
@@ -170,6 +179,7 @@ public class ClientLevelModule implements Closeable, IDataSourceUpdateListenerFu
 		}
 		
 		this.fullDataSourceProvider.removeDataSourceUpdateListener(this);
+		this.genericRenderer.close();
 	}
 	
 	
@@ -259,7 +269,7 @@ public class ClientLevelModule implements Closeable, IDataSourceUpdateListenerFu
 		@Override
 		public void close()
 		{
-			LOGGER.info("Shutting down " + ClientRenderState.class.getSimpleName());
+			//LOGGER.info("Shutting down " + ClientRenderState.class.getSimpleName());
 			this.quadtree.close();
 		}
 		

core/src/main/java/com/seibel/distanthorizons/core/level/DhClientLevel.java

@@ -167,15 +167,17 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 			}
 			
 			
+			// Check this before decoding data to prevent errors if multiple client levels 
+			// are receiving data at once (Immersive Portals compatibility).
+			boolean isSameLevel = message.isSameLevelAs(this.levelWrapper);
+			//NETWORK_LOGGER.debug("Buffer ["+message.payload.dtoBufferId+"] isSameLevel: ["+isSameLevel+"]");
+			if (!isSameLevel)
+			{
+				return;
+			}
+			
 			try (FullDataSourceV2DTO dataSourceDto = this.networkState.fullDataPayloadReceiver.decodeDataSource(message.payload))
 			{
-				boolean isSameLevel = message.isSameLevelAs(this.levelWrapper);
-				NETWORK_LOGGER.debug("Buffer ["+message.payload.dtoBufferId+"] isSameLevel: ["+isSameLevel+"]");
-				if (!isSameLevel)
-				{
-					return;
-				}
-				
 				
 				Executor executor = ThreadPoolUtil.getFileHandlerExecutor();
 				if (executor != null)
@@ -219,6 +221,7 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 	{
 		try
 		{
+			if (MC_CLIENT.getWrappedClientLevel() == null || MC_CLIENT.getWrappedClientLevel().getDhLevel() != this) return;
 			this.clientside.clientTick();
 			
 			if (this.syncOnLoadRequestQueue != null)

core/src/main/java/com/seibel/distanthorizons/core/level/DhClientServerLevel.java

@@ -71,7 +71,11 @@ public class DhClientServerLevel extends AbstractDhServerLevel implements IDhCli
 	//region
 	
 	@Override
-	public void clientTick() { this.clientside.clientTick(); }
+	public void clientTick()
+	{
+		if (MC_CLIENT.getWrappedClientLevel() == null || MC_CLIENT.getWrappedClientLevel().getDhLevel() != this) return;
+		this.clientside.clientTick();
+	}
 	
 	//endregion
 	

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/client/AbstractFullDataNetworkRequestQueue.java

@@ -151,8 +151,7 @@ public abstract class AbstractFullDataNetworkRequestQueue implements IDebugRende
 	
 	public synchronized boolean tick(DhBlockPos2D targetPos)
 	{
-		if (DhApiWorldProxy.INSTANCE.worldLoaded() 
-			&& DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			return false;
 		}

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/client/ClientNetworkState.java

@@ -13,6 +13,7 @@ import com.seibel.distanthorizons.core.network.event.ScopedNetworkEventSource;
 import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
 import com.seibel.distanthorizons.core.network.event.internal.IncompatibleMessageInternalEvent;
 import com.seibel.distanthorizons.core.network.messages.base.LevelInitMessage;
+import com.seibel.distanthorizons.core.network.messages.base.RequestLevelInitMessage;
 import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceResponseMessage;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSplitMessage;
@@ -164,7 +165,8 @@ public class ClientNetworkState implements Closeable
 	// send message //
 	//==============//
 	
-	
+	public void sendLevelInitRequest(String clientLevelKey) 
+	{ this.getSession().sendMessage(new RequestLevelInitMessage(clientLevelKey)); }
 	
 	public void sendConfigMessage() { this.sendConfigMessage(true); }
 	public void sendConfigMessage(boolean blocking)

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/fullData/FullDataPayloadReceiver.java

@@ -7,10 +7,10 @@ import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.network.INetworkObject;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSplitMessage;
 import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
-import com.seibel.distanthorizons.core.util.LodUtil;
 import io.netty.buffer.CompositeByteBuf;
 import io.netty.buffer.Unpooled;
 
+import java.util.Objects;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.TimeUnit;
 
@@ -21,7 +21,7 @@ public class FullDataPayloadReceiver implements AutoCloseable
 			.build();
 	
 	private final ConcurrentMap<Integer, CompositeByteBuf> buffersById = CacheBuilder.newBuilder()
-			.expireAfterAccess(10, TimeUnit.SECONDS)
+		.expireAfterAccess(30, TimeUnit.SECONDS)
 			.<Integer, CompositeByteBuf>build().asMap();
 	
 	@Override
@@ -56,7 +56,7 @@ public class FullDataPayloadReceiver implements AutoCloseable
 	public FullDataSourceV2DTO decodeDataSource(FullDataPayload payload)
 	{
 		CompositeByteBuf compositeByteBuffer = this.buffersById.get(payload.dtoBufferId);
-		LodUtil.assertTrue(compositeByteBuffer != null, "decoded data source missing byte buffer");
+		Objects.requireNonNull(compositeByteBuffer, "Unable to get a complete buffer for a received payload. Ignore this if it doesn't spam similar errors");
 		
 		try
 		{

core/src/main/java/com/seibel/distanthorizons/core/multiplayer/server/ServerPlayerState.java

@@ -2,6 +2,7 @@ package com.seibel.distanthorizons.core.multiplayer.server;
 
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.level.AbstractDhServerLevel;
 import com.seibel.distanthorizons.core.multiplayer.config.SessionConfig;
 import com.seibel.distanthorizons.core.multiplayer.fullData.FullDataPayloadSender;
@@ -9,20 +10,25 @@ import com.seibel.distanthorizons.core.multiplayer.fullData.SharedBandwidthLimit
 import com.seibel.distanthorizons.core.network.event.internal.IncompatibleMessageInternalEvent;
 import com.seibel.distanthorizons.core.network.messages.base.CloseReasonMessage;
 import com.seibel.distanthorizons.core.network.messages.base.LevelInitMessage;
+import com.seibel.distanthorizons.core.network.messages.base.RequestLevelInitMessage;
 import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
 import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
 import com.seibel.distanthorizons.core.network.exceptions.RateLimitedException;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
 import com.seibel.distanthorizons.core.network.session.NetworkSession;
 import com.seibel.distanthorizons.core.util.ratelimiting.SupplierBasedRateAndConcurrencyLimiter;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftSharedWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.Closeable;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Supplier;
 
 public class ServerPlayerState implements Closeable
 {
+	private final IMinecraftSharedWrapper MC_SHARED = SingletonInjector.INSTANCE.get(IMinecraftSharedWrapper.class);
+	
 	private final ConfigChangeListener<String> levelKeyPrefixChangeListener
 			= new ConfigChangeListener<>(Config.Server.levelKeyPrefix, this::onLevelKeyPrefixConfigChanged);
 	private final SessionConfig.AnyChangeListener configAnyChangeListener = new SessionConfig.AnyChangeListener(this::sendConfigMessage);
@@ -66,6 +72,12 @@ public class ServerPlayerState implements Closeable
 			this.sendConfigMessage();
 		});
 		
+		this.networkSession.registerHandler(RequestLevelInitMessage.class, (requestLevelKeyMessage) ->
+		{
+			sendLevelKey(requestLevelKeyMessage.clientLevelKey);
+		});
+		
+		
 		this.networkSession.registerHandler(CloseInternalEvent.class, event -> {
 			// No-op. prevents "Unhandled message" log entries
 		});
@@ -85,12 +97,27 @@ public class ServerPlayerState implements Closeable
 	//=================//
 	
 	private void onLevelKeyPrefixConfigChanged(String newLevelKey) { this.sendLevelKey(); }
+	
+	private void sendLevelKey(String clientLevelKey)
+	{
+		sendLevelKey(() -> 
+			MC_SHARED
+			.getWrappedServerLevel(clientLevelKey)
+			.getKeyedLevelDimensionName());
+	}
 	private void sendLevelKey()
+	{
+		sendLevelKey(() -> 
+			this.getServerPlayer()
+				.getLevel()
+				.getKeyedLevelDimensionName());
+	}
+	private void sendLevelKey(Supplier<String> levelKeySupplier)
 	{
 		if (Config.Server.sendLevelKeys.get())
 		{
+			String levelKey = levelKeySupplier.get();
 			// let the client's know about the change
-			String levelKey = this.getServerPlayer().getLevel().getKeyedLevelDimensionName();
 			if (!levelKey.equals(this.lastLevelKey))
 			{
 				this.lastLevelKey = levelKey;

core/src/main/java/com/seibel/distanthorizons/core/network/messages/MessageRegistry.java

@@ -21,12 +21,9 @@ package com.seibel.distanthorizons.core.network.messages;
 
 import com.google.common.collect.BiMap;
 import com.google.common.collect.HashBiMap;
-import com.seibel.distanthorizons.core.network.messages.base.CodecCrashMessage;
-import com.seibel.distanthorizons.core.network.messages.base.LevelInitMessage;
-import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
+import com.seibel.distanthorizons.core.network.messages.base.*;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSplitMessage;
 import com.seibel.distanthorizons.core.network.messages.requests.CancelMessage;
-import com.seibel.distanthorizons.core.network.messages.base.CloseReasonMessage;
 import com.seibel.distanthorizons.core.network.messages.requests.ExceptionMessage;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
 import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
@@ -60,6 +57,7 @@ public class MessageRegistry
 		
 		// Level keys
 		this.registerMessage(LevelInitMessage.class, LevelInitMessage::new);
+		this.registerMessage(RequestLevelInitMessage.class, RequestLevelInitMessage::new);
 		
 		// Config (for full DH support)
 		this.registerMessage(SessionConfigMessage.class, SessionConfigMessage::new);

core/src/main/java/com/seibel/distanthorizons/core/network/messages/base/RequestLevelInitMessage.java

@@ -0,0 +1,65 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.messages.base;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+/** used for full DH support */
+public class RequestLevelInitMessage extends AbstractNetworkMessage
+{
+	public String clientLevelKey;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public RequestLevelInitMessage() { }
+	public RequestLevelInitMessage(String clientLevelKey) { this.clientLevelKey = clientLevelKey; }
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf out) { this.writeString(this.clientLevelKey, out); }
+	
+	@Override
+	public void decode(ByteBuf in) { this.clientLevelKey = this.readString(in); }
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public MoreObjects.ToStringHelper toStringHelper()
+	{
+		return super.toStringHelper()
+				.add("levelKey", this.clientLevelKey);
+	}
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/render/DhApiRenderProxy.java

@@ -77,6 +77,8 @@ public class DhApiRenderProxy implements IDhApiRenderProxy
 			}
 		}
 		
+		// TODO clear tint handler too
+		
 		return DhApiResult.createSuccess();
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/render/QuadTree/LodQuadTree.java

@@ -21,6 +21,7 @@ package com.seibel.distanthorizons.core.render.QuadTree;
 
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.config.listeners.IConfigListener;
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.enums.EDhDirection;
 import com.seibel.distanthorizons.core.file.fullDatafile.V2.FullDataSourceProviderV2;
@@ -148,7 +149,8 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 			int initialPlayerBlockX, int initialPlayerBlockZ,
 			FullDataSourceProviderV2 fullDataSourceProvider)
 	{
-		super(viewDiameterInBlocks, new DhBlockPos2D(initialPlayerBlockX, initialPlayerBlockZ), DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL);
+		super(viewDiameterInBlocks, FullDataSourceV2.WIDTH, 
+			new DhBlockPos2D(initialPlayerBlockX, initialPlayerBlockZ), DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL);
 		
 		DEBUG_RENDERER.register(this, Config.Client.Advanced.Debugging.DebugWireframe.showQuadTreeRenderStatus);
 		
@@ -245,17 +247,38 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 		//===================//
 		//region
 		
-		this.setCenterBlockPos(playerPos, (renderSection) ->
-		{
-			// removing out of bounds sections
-			if (renderSection != null)
+		// remove out of bound sections
+		this.setCenterBlockPos(playerPos, 
+			// remove completely out of bound nodes
+			// (the root node is no longer in bounds)
+			(renderSection) ->
 			{
-				this.fullDataSourceProvider.removeRetrievalRequestIf((long genPos) -> DhSectionPos.contains(renderSection.pos, genPos));
-				this.missingGenerationPosSet.remove(renderSection.pos);
-				this.queuedGenerationPosSet.remove(renderSection.pos);
-				renderSection.close();
+				if (renderSection != null)
+				{
+					this.fullDataSourceProvider.removeRetrievalRequestIf((long genPos) -> DhSectionPos.contains(renderSection.pos, genPos));
+					
+					// unfortunately we have to fully go through each set
+					// since a removed position may be larger than the multiple generated positions
+					// it contains
+					this.missingGenerationPosSet.removeIf((Long genPos) -> DhSectionPos.contains(renderSection.pos, genPos));
+					this.queuedGenerationPosSet.removeIf((Long genPos) -> DhSectionPos.contains(renderSection.pos, genPos));
+					
+					renderSection.close();
+				}
+			},
+			// mutate partially out of bound nodes
+			// (the root node is still in bounds, but this individual child node isn't)
+			(renderSection) ->
+			{
+				if (renderSection != null)
+				{
+					// when this node comes back into render distance
+					// we'll need to re-load it since the full data
+					// may have been modified while it was out of bounds
+					renderSection.renderDataDirty = true;
+				}
 			}
-		});
+		);
 		
 		//endregion
 		
@@ -304,7 +327,7 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 					continue;
 				}
 				
-				node.value.retreivedMissingSectionsForRetreival = false;
+				node.value.queuedMissingSectionsForRetrieval = false;
 			}
 		}
 		
@@ -372,8 +395,6 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 		//=========================//
 		//region
 		
-		// also handles disabling beacons
-		
 		for (QuadNode<LodRenderSection> node : this.tickNodeHolder.getDisableNodes())
 		{
 			if (node == null || node.value == null) { continue; }
@@ -449,9 +470,9 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 						
 						// since this section wants to render
 						// check if it needs any generation to do so
-						if (!node.value.retreivedMissingSectionsForRetreival)
+						if (!node.value.queuedMissingSectionsForRetrieval)
 						{
-							node.value.retreivedMissingSectionsForRetreival = true;
+							node.value.queuedMissingSectionsForRetrieval = true;
 							this.tryQueuePosForRetrieval(node.value.pos); // can be quite slow
 						}
 					}
@@ -476,9 +497,10 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 	//=========================//
 	// tick - recursive update //
 	//=========================//
-	///region
+	//region
 	
-	private void recursivelyUpdateRenderSectionNode(
+	/** @return true if the node at this position has uploaded its render data */
+	private boolean recursivelyUpdateRenderSectionNode(
 		@NotNull DhBlockPos2D playerPos, 
 		@NotNull QuadNode<LodRenderSection> rootNode, 
 		@Nullable QuadNode<LodRenderSection> parentNode, 
@@ -490,19 +512,22 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 		// get/create the node //
 		// and render section  //
 		//=====================//
-		///region
+		//region
 		
-		// create the node
-		if (quadNode == null)
-		{   
-			rootNode.setValue(sectionPos, new LodRenderSection(sectionPos, this, this.level, this.fullDataSourceProvider));
-			quadNode = rootNode.getNode(sectionPos);
-		}
-		if (quadNode == null)
+		quadNode = this.tryAddNodeToTree(rootNode, quadNode, sectionPos);
+		
+		
+		// Skip sections that are out-of-bounds.
+		// If not done some sections will appear and/or generate 
+		// outside the desired render distance
+		if (!this.isSectionPosInBounds(quadNode.sectionPos))
 		{
-			LodUtil.assertNotReach("Unable to add node with pos ["+DhSectionPos.toString(sectionPos)+"] to tree root ["+rootNode+"].");
+			this.tickNodeHolder.addDisableNode(quadNode);
+			this.recursivelyDisableChildNodes(quadNode);
+			return true;
 		}
 		
+		
 		// make sure the render section is created (shouldn't be necessary, but just in case)
 		LodRenderSection renderSection = quadNode.value;
 		if (renderSection == null)
@@ -511,7 +536,7 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 			quadNode.setValue(sectionPos, renderSection);
 		}
 		
-		///endregion
+		//endregion
 		
 		
 		
@@ -519,7 +544,7 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 		// handle enabling, loading,     //
 		// and disabling render sections //
 		//===============================//
-		///region
+		//region
 		
 		// load every node for rendering
 		if (!renderSection.gpuUploadInProgress()
@@ -535,94 +560,153 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 		
 		if (DhSectionPos.getDetailLevel(quadNode.sectionPos) > expectedDetailLevel)
 		{
-			this.onDetailLevelTooHigh(playerPos, rootNode, quadNode);
+			return this.onDetailLevelTooLow(playerPos, rootNode, quadNode);
 		}
 		// the (expectedDetailLevel-1) fixes corners being cut out due to distance calculations using the LOD center 
 		else if (DhSectionPos.getDetailLevel(quadNode.sectionPos) == expectedDetailLevel 
 			|| DhSectionPos.getDetailLevel(quadNode.sectionPos) == expectedDetailLevel - 1)
 		{
-			this.onDesiredDetailLevel(quadNode, parentNode);
+			return this.onDesiredDetailLevel(quadNode, parentNode);
 		}
 		else
 		{
 			throw new IllegalStateException("LodQuadTree shouldn't be updating renderSections below the expected detail level: [" + expectedDetailLevel + "].");
 		}
 		
-		///endregion
+		//endregion
 	}
-	private void onDetailLevelTooHigh(
+	/** @return true if the node at this position has uploaded its render data */
+	private boolean onDetailLevelTooLow(
 		@NotNull DhBlockPos2D playerPos, 
-		@NotNull QuadNode<LodRenderSection> rootNode, @NotNull QuadNode<LodRenderSection> quadNode)
+		@NotNull QuadNode<LodRenderSection> rootNode, 
+		@NotNull QuadNode<LodRenderSection> quadNode)
 	{
 		// recursively update each child node
-		boolean allChildNodesCanRender = true;
+		int childNodeRenderCount = 0;
 		for (int i = 0; i < 4; i++)
 		{
-			QuadNode<LodRenderSection> childNode = quadNode.getChildByIndex(i);
 			long childPos = DhSectionPos.getChildByIndex(quadNode.sectionPos, i);
-			this.recursivelyUpdateRenderSectionNode(
-				playerPos, 
-				rootNode, quadNode, childNode, childPos);
-			childNode = quadNode.getChildByIndex(i); // needs to be gotten again in case a new node was added to the tree (this will often happen when moving into new areas where the children were deleted)
+			QuadNode<LodRenderSection> childNode = quadNode.getChildByIndex(i);
 			
-			// nodes shouldn't be null, but just in case
-			if (childNode != null
-				&& childNode.value != null
-				&& !childNode.value.gpuUploadComplete())
+			boolean childCanRender = this.recursivelyUpdateRenderSectionNode(
+				playerPos,
+				rootNode, quadNode, childNode, childPos);
+			if (childCanRender)
 			{
-				// the node is present but not uploaded yet
-				allChildNodesCanRender = false;
+				// node can be rendered
+				childNodeRenderCount++;
 			}
 		}
 		
-		
-		if (allChildNodesCanRender)
+		boolean isRootNode = (quadNode == rootNode);
+		if (isRootNode)
 		{
-			// all child nodes can render, this node isn't needed
+			// Never render the root node.
+			// This is done to prevent flashing when moving across root node
+			// boundaries.
+			// Otherwise, when moving, new empty nodes will be added at the edge of the tree
+			// which will require the root node to render to cover the "empty" area.
 			this.tickNodeHolder.addDisableNode(quadNode);
+			return false;
+		}
+		else if (childNodeRenderCount >= 4)
+		{
+			this.tickNodeHolder.addDisableNode(quadNode);
+			
+			// all children can render,
+			// the area will be filled when rendering
+			return true;
 		}
 		else
 		{
-			// not all child positions are loaded yet, this one should be rendered instead
-			this.tickNodeHolder.addEnableNode(quadNode);
+			boolean nodeCanRender = quadNode.value != null
+									&& quadNode.value.canRender();
+			if (nodeCanRender)
+			{
+				// not all child positions are loaded yet, this one should be rendered instead
+				this.tickNodeHolder.addEnableNode(quadNode);
+				this.recursivelyDisableChildNodes(quadNode);
+			}
+			else
+			{
+				this.tickNodeHolder.addDisableNode(quadNode);
+			}
+			
+			return nodeCanRender;
 		}
 	}
-	private void onDesiredDetailLevel(
-		@NotNull QuadNode<LodRenderSection> quadNode, @Nullable QuadNode<LodRenderSection> parentNode)
+	
+	/** @return true if the node at this position has uploaded its render data */
+	private boolean onDesiredDetailLevel(
+		@NotNull QuadNode<LodRenderSection> quadNode,
+		@Nullable QuadNode<LodRenderSection> parentNode)
 	{
-		boolean allAdjNodesCanRender = true;
-		
-		// if the parent node is null, that means we're at the root node
-		// and we should always render
-		if (parentNode != null)
+		// Skip sections that are out-of-bounds.
+		// If not done some sections will appear and/or generate 
+		// outside the desired render distance
+		if (!this.isSectionPosInBounds(quadNode.sectionPos))
 		{
-			// check if all adjacent nodes are ready to render
-			// this check is done to prevent some overlapping due to the parent node
-			// still being active
-			for (int i = 0; i < 4; i++)
+			return true;
+		}
+		
+		if (quadNode.value != null 
+			&& quadNode.value.canRender())
+		{
+			if (!this.tickNodeHolder.getEnabledNodes().contains(parentNode))
 			{
-				QuadNode<LodRenderSection> adjNode = parentNode.getChildByIndex(i);
-				// nodes shouldn't be null, but just in case there's an issue
-				if (adjNode != null
-					&& adjNode.value != null
-					&& !adjNode.value.gpuUploadComplete())
-				{
-					// the node is present but not uploaded yet
-					allAdjNodesCanRender = false;
-				}
+				this.tickNodeHolder.addEnableDeleteChildrenNode(quadNode);
+				return true;
+			}
+			else
+			{
+				this.tickNodeHolder.addDisableNode(quadNode);
+				return false;
 			}
 		}
-		
-		if (allAdjNodesCanRender
-			&& quadNode.value != null 
-			&& quadNode.value.gpuUploadComplete())
+		else
 		{
-			this.tickNodeHolder.addEnableDeleteChildrenNode(quadNode);
+			this.tickNodeHolder.addDisableNode(quadNode);
+			return false;
 		}
 	}
 	
 	
-	///endregion
+	@NotNull
+	private QuadNode<LodRenderSection> tryAddNodeToTree(
+		@NotNull QuadNode<LodRenderSection> rootNode,
+		@Nullable QuadNode<LodRenderSection> quadNode,
+		long sectionPos // section pos is needed here since the quad node may be null
+		)
+	{
+		// create the node
+		if (quadNode == null)
+		{
+			rootNode.setValue(sectionPos, new LodRenderSection(sectionPos, this, this.level, this.fullDataSourceProvider));
+			quadNode = rootNode.getNode(sectionPos);
+		}
+		if (quadNode == null)
+		{
+			LodUtil.assertNotReach("Unable to add node with pos ["+DhSectionPos.toString(sectionPos)+"] to tree root ["+rootNode+"].");
+		}
+		
+		return quadNode;
+	}
+	
+	private void recursivelyDisableChildNodes(@NotNull QuadNode<LodRenderSection> quadNode)
+	{
+		for (int i = 0; i < 4; i++)
+		{
+			QuadNode<LodRenderSection> childNode = quadNode.getChildByIndex(i);
+			this.tickNodeHolder.removeEnableAndDisableNode(childNode);
+			
+			if (childNode != null)
+			{
+				this.recursivelyDisableChildNodes(childNode);
+			}
+		}
+	}
+	
+	//endregion
 	
 	//=====================//
 	// tick - work queuing //
@@ -1127,7 +1211,7 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 			{
 				color = Color.ORANGE;
 			}
-			else if (!renderSection.gpuUploadComplete())
+			else if (!renderSection.canRender())
 			{
 				// uploaded but the buffer is missing
 				color = Color.PINK;
@@ -1169,7 +1253,7 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 	@Override
 	public void close()
 	{
-		LOGGER.info("Shutting down LodQuadTree...");
+		//LOGGER.info("Shutting down LodQuadTree...");
 		
 		DEBUG_RENDERER.unregister(this, Config.Client.Advanced.Debugging.DebugWireframe.showQuadTreeRenderStatus);
 		Config.Common.WorldGenerator.enableDistantGeneration.removeListener(this);
@@ -1204,7 +1288,7 @@ public class LodQuadTree extends QuadTree<LodRenderSection> implements IDebugRen
 		});
 		
 		
-		LOGGER.info("Finished shutting down LodQuadTree");
+		//LOGGER.info("Finished shutting down LodQuadTree");
 	}
 	
 	//endregion base methods

core/src/main/java/com/seibel/distanthorizons/core/render/QuadTree/LodRenderSection.java

@@ -34,11 +34,9 @@ import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.renderer.AbstractDebugWireframeRenderer;
-import com.seibel.distanthorizons.core.render.renderer.BeaconRenderHandler;
 import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
 import com.seibel.distanthorizons.core.dataObjects.render.bufferBuilding.LodBufferContainer;
-import com.seibel.distanthorizons.core.sql.dto.BeaconBeamDTO;
-import com.seibel.distanthorizons.core.sql.repo.BeaconBeamRepo;
+import com.seibel.distanthorizons.core.util.ExceptionUtil;
 import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
@@ -48,10 +46,8 @@ import org.jetbrains.annotations.Nullable;
 
 import javax.annotation.WillNotClose;
 import java.awt.*;
-import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicReference;
-import java.util.concurrent.locks.ReentrantLock;
 
 /**
  * A render section represents an area that could be rendered.
@@ -67,7 +63,7 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 	
 	public final long pos;
 	
-	private final IDhClientLevel level;
+	private final IDhClientLevel clientLevel;
 	private final IClientLevelWrapper levelWrapper;
 	@WillNotClose
 	private final FullDataSourceProviderV2 fullDataSourceProvider;
@@ -75,8 +71,16 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 	
 	
 	private boolean renderingEnabled = false;
-	private boolean beaconsRendering = false;
-	public boolean retreivedMissingSectionsForRetreival = false;
+	/** 
+	 * Used when a node goes out of render distance
+	 * but isn't removed from the underlying quad tree structure. <br><br>
+	 * 
+	 * In those cases we should act as if the node was removed
+	 * for cached render data caching purposes, but not
+	 * for re-creating missing nodes.
+	 */
+	public boolean renderDataDirty = false;
+	public boolean queuedMissingSectionsForRetrieval = false;
 	
 	/** this reference is necessary so we can determine what VBO to render */
 	public LodBufferContainer renderBufferContainer; 
@@ -94,13 +98,6 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 	 */
 	private Runnable getAndBuildRenderDataRunnable = null;
 	
-	/** 
-	 * Represents just uploading the {@link LodQuadBuilder} to the GPU. <br>
-	 * Separate from {@link LodRenderSection#getAndBuildRenderDataFutureRef} because they run on
-	 * different threads (buffer uploading is on the MC render thread) and need to be canceled separately.
-	 */
-	private final AtomicReference<CompletableFuture<LodBufferContainer>> bufferUploadFutureRef = new AtomicReference<>(null);
-	
 	
 	
 	//=============//
@@ -111,12 +108,12 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 	public LodRenderSection(
 			long pos, 
 			LodQuadTree quadTree, 
-			IDhClientLevel level, FullDataSourceProviderV2 fullDataSourceProvider)
+			IDhClientLevel clientLevel, FullDataSourceProviderV2 fullDataSourceProvider)
 	{
 		this.pos = pos;
 		this.quadTree = quadTree;
-		this.level = level;
-		this.levelWrapper = level.getClientLevelWrapper();
+		this.clientLevel = clientLevel;
+		this.levelWrapper = clientLevel.getClientLevelWrapper();
 		this.fullDataSourceProvider = fullDataSourceProvider;
 		
 		DEBUG_RENDERER.register(this, Config.Client.Advanced.Debugging.DebugWireframe.showRenderSectionStatus);
@@ -158,6 +155,8 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 		
 		try
 		{
+			// shouldn't happen since this method is synchronized, but just in case
+			// make sure we only ever start one upload task
 			if (!this.getAndBuildRenderDataFutureRef.compareAndSet(null, future))
 			{
 				CompletableFuture<Void> oldFuture = this.getAndBuildRenderDataFutureRef.get();
@@ -170,6 +169,7 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 			{
 				try
 				{
+					// build LOD data on a DH thread
 					LodQuadBuilder lodQuadBuilder = this.getAndBuildRenderData();
 					if (lodQuadBuilder == null)
 					{
@@ -177,7 +177,8 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 						return;
 					}
 					
-					this.uploadToGpuAsync(lodQuadBuilder)
+					// uploading will primarily happen on the render thread
+					this.uploadToGpuAsync(future, lodQuadBuilder)
 						.thenRun(() ->
 						{
 							// the future is passed in separately (IE not using the local var) to prevent any possible race condition null pointers
@@ -187,7 +188,7 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 				catch (Exception e)
 				{
 					LOGGER.error("Unexpected issue creating render data for pos: ["+DhSectionPos.toString(this.pos)+"], error: ["+e.getMessage()+"].", e);
-					future.complete(null);
+					future.completeExceptionally(e);
 				}
 			};
 			executor.execute(this.getAndBuildRenderDataRunnable);
@@ -202,6 +203,14 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 			return false;
 		}
 	}
+	
+	
+	//=======================//
+	// Get LOD ID data       //
+	// and build render data //
+	//=======================//
+	//region
+	
 	@Nullable
 	private synchronized LodQuadBuilder getAndBuildRenderData()
 	{
@@ -215,7 +224,7 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 			
 			
 			boolean enableTransparency = Config.Client.Advanced.Graphics.Quality.transparency.get().transparencyEnabled;
-			LodQuadBuilder lodQuadBuilder = new LodQuadBuilder(enableTransparency, this.level.getClientLevelWrapper());
+			LodQuadBuilder lodQuadBuilder = new LodQuadBuilder(enableTransparency, this.clientLevel.getClientLevelWrapper());
 			
 			
 			// get the adjacent positions
@@ -238,7 +247,7 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 
 				// the render sources are only needed by this synchronous method,
 				// then they can be closed
-				ColumnRenderBufferBuilder.makeLodRenderData(lodQuadBuilder, thisRenderSource, this.level, adjacentRenderSections, adjIsSameDetailLevel);
+				ColumnRenderBufferBuilder.makeLodRenderData(lodQuadBuilder, thisRenderSource, this.clientLevel, adjacentRenderSections, adjIsSameDetailLevel);
 				return lodQuadBuilder;
 			}
 			catch (Exception e)
@@ -288,52 +297,63 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 		detailLevel += DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL;
 		return detailLevel == DhSectionPos.getDetailLevel(this.pos);
 	}
-	private synchronized CompletableFuture<LodBufferContainer> uploadToGpuAsync(LodQuadBuilder lodQuadBuilder)
+	
+	//endregion
+	
+	
+	private synchronized CompletableFuture<LodBufferContainer> uploadToGpuAsync(
+		CompletableFuture<Void> parentFuture, 
+		LodQuadBuilder lodQuadBuilder)
 	{
-		CompletableFuture<LodBufferContainer> oldFuture = this.bufferUploadFutureRef.getAndSet(null);
-		if (oldFuture != null)
+		CompletableFuture<LodBufferContainer> uploadFuture = LodBufferContainer.tryMakeAndUploadBuffersAsync(this.pos, this.clientLevel, lodQuadBuilder);
+		uploadFuture.whenComplete((bufferContainer, e) ->
 		{
-			// canceling the previous future
-			// prevents the CPU from working on something that won't be used
-			oldFuture.cancel(true);
-		}
-		
-		CompletableFuture<LodBufferContainer> future = ColumnRenderBufferBuilder.uploadBuffersAsync(this.level, this.pos, lodQuadBuilder);
-		future.handle((lodBufferContainer, throwable) -> 
-		{
-			if (!this.bufferUploadFutureRef.compareAndSet(future, null)
-				// if the old future is canceled then the future ref will be different and that's expected
-				&& !future.isCancelled()
-				// if the old future is already done, then we don't care about the ref being swapped
-				&& !future.isDone())
+			try
 			{
-				LOGGER.warn("Buffer upload future ref changed for pos: ["+DhSectionPos.toString(this.pos)+"].");
+				// handle errors and early shutdown
+				if (e != null)
+				{
+					if (!ExceptionUtil.isShutdownException(e))
+					{
+						LOGGER.error("Unexpected issue uploading buffers for pos: [" + DhSectionPos.toString(this.pos) + "], error: [" + e.getMessage() + "].", e);
+					}
+					
+					if (bufferContainer != null)
+					{
+						// shouldn't happen, but just in case
+						bufferContainer.close();
+					}
+					return;
+				}
+				
+				// close the old container
+				LodBufferContainer oldContainer = this.renderBufferContainer;
+				this.renderBufferContainer = bufferContainer.buffersUploaded ? bufferContainer : null;
+				if (oldContainer != null)
+				{
+					oldContainer.close();
+				}
+				
+				// upload complete
+				this.renderDataDirty = false;
+				
+				
+				if (parentFuture.isCancelled())
+				{
+					// if the parent future was canceled that likely means
+					// this LodRenderSection was closed before this point,
+					// meaning this buffer will become homeless, 
+					// so we need to clean it up here
+					bufferContainer.close();
+				}
 			}
-			
-			return null;
-		});
-		
-		future.thenAccept((LodBufferContainer buffer) ->
-		{
-			// needed to clean up the old data
-			LodBufferContainer previousContainer = this.renderBufferContainer;
-			
-			// upload complete
-			this.renderBufferContainer = buffer.buffersUploaded ? buffer : null;
-			
-			if (previousContainer != null)
+			catch (Exception finishEx)
 			{
-				previousContainer.close();
+				LOGGER.error("Unexpected buffer finish exception: ["+finishEx.getMessage()+"]", finishEx);
 			}
 		});
 		
-		
-		if (!this.bufferUploadFutureRef.compareAndSet(null, future))
-		{
-			LodUtil.assertNotReach("Buffer upload future ref couldn't be set due to concurrency error, pos: ["+DhSectionPos.toString(this.pos)+"].");
-		}
-		
-		return future;
+		return uploadFuture;
 	}
 	
 	//endregion render data uploading
@@ -345,7 +365,14 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 	//=================//
 	//region
 	
-	public boolean gpuUploadComplete() { return this.renderBufferContainer != null; }
+	public boolean canRender() { return this.renderBufferContainer != null; }
+	public boolean gpuUploadComplete() 
+	{ 
+		return this.renderBufferContainer != null
+			// render dirty is here so we can trigger new GPU uploads
+			// even if the render data is present
+			&& !this.renderDataDirty; 
+	}
 	
 	public boolean getRenderingEnabled() { return this.renderingEnabled; }
 	public void setRenderingEnabled(boolean enabled) { this.renderingEnabled = enabled;}
@@ -374,14 +401,14 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 		{
 			color = Color.yellow;
 		}
-		else if (this.gpuUploadComplete())
+		else if (this.canRender())
 		{
 			//color = Color.cyan;
 			return;
 		}
 		
-		int levelMinY = this.level.getLevelWrapper().getMinHeight();
-		int levelMaxY = this.level.getLevelWrapper().getMaxHeight();
+		int levelMinY = this.clientLevel.getLevelWrapper().getMinHeight();
+		int levelMaxY = this.clientLevel.getLevelWrapper().getMaxHeight();
 		
 		// show the wireframe a bit lower than world max height,
 		// since most worlds don't render all the way up to the max height
@@ -418,12 +445,7 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 		}
 		
 		
-		if (this.renderBufferContainer != null)
-		{
-			this.renderBufferContainer.close();
-		}
-		
-		// removes any in-progress futures since they aren't needed any more
+		// render loading is no longer needed
 		CompletableFuture<Void> buildFuture = this.getAndBuildRenderDataFutureRef.get();
 		if (buildFuture != null)
 		{
@@ -439,12 +461,17 @@ public class LodRenderSection implements IDebugRenderable, AutoCloseable
 					renderLoaderExecutor.remove(runnable);
 				}
 			}
+			
+			// cancel the future after removing the runnable
+			// to make sure the runnable is properly removed
+			buildFuture.cancel(true);
 		}
 		
-		CompletableFuture<LodBufferContainer> uploadFuture = this.bufferUploadFutureRef.get();
-		if (uploadFuture != null)
+		
+		this.setRenderingEnabled(false);
+		if (this.renderBufferContainer != null)
 		{
-			uploadFuture.cancel(true);
+			this.renderBufferContainer.close();
 		}
 		
 	}

core/src/main/java/com/seibel/distanthorizons/core/render/QuadTree/QuadTreeTickNodeHolder.java

@@ -63,21 +63,39 @@ public class QuadTreeTickNodeHolder
 	{
 		if(this.presentNodes.add(node))
 		{
-			// not a big fan of having to check every node to prevent overlaps, but it does work
-			this.nodesToEnable.removeIf((QuadNode<LodRenderSection> checkNode) ->
+			// in James testing as of 4-21-2026
+			// this should no longer be needed to prevent overlaps,
+			// however I'm keeping it here as a quick fix solution if 
+			// the problem comes up again
+			if (false)
 			{
-				boolean contained = DhSectionPos.contains(node.sectionPos, checkNode.sectionPos);
-				if (contained)
+				// not a big fan of having to check every node to prevent overlaps, but it does work
+				this.nodesToEnable.removeIf((QuadNode<LodRenderSection> checkNode) ->
 				{
-					this.nodesToDisable.add(checkNode);
-				}
-				
-				return contained;
-			});
+					boolean contained = DhSectionPos.contains(node.sectionPos, checkNode.sectionPos);
+					if (contained)
+					{
+						this.nodesToDisable.add(checkNode);
+					}
+					
+					return contained;
+				});
+			}
 			
 			this.nodesToEnable.add(node);
 		}
 	}
+	
+	/**  */
+	public void removeEnableAndDisableNode(QuadNode<LodRenderSection> node)
+	{
+		this.nodesToEnable.remove(node);
+		this.nodesToEnableDeleteChildrenList.remove(node);
+		
+		this.presentNodes.add(node); // should already be present, but re-added just in case
+		this.nodesToDisable.add(node); // node shouldn't be rendered since it's being disabled by a parent
+	}
+	
 	public HashSet<QuadNode<LodRenderSection>> getEnabledNodes() { return this.nodesToEnable; }
 	
 	

core/src/main/java/com/seibel/distanthorizons/core/render/RenderParams.java

@@ -6,18 +6,14 @@ import com.seibel.distanthorizons.core.api.internal.SharedApi;
 import com.seibel.distanthorizons.core.api.internal.rendering.DhRenderState;
 import com.seibel.distanthorizons.core.dependencyInjection.ModAccessorInjector;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
-import com.seibel.distanthorizons.core.jar.EPlatform;
 import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.util.RenderUtil;
 import com.seibel.distanthorizons.core.util.math.Mat4f;
 import com.seibel.distanthorizons.core.util.math.Vec3d;
-import com.seibel.distanthorizons.core.util.threading.PriorityTaskPicker;
-import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.core.world.IDhClientWorld;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.misc.ILightMapWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor.AbstractOptifineAccessor;
 import com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor.IOptifineAccessor;
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.renderPass.IDhGenericRenderer;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
@@ -87,7 +83,7 @@ public class RenderParams extends DhApiRenderParam
 		this.dhClientWorld = SharedApi.tryGetDhClientWorld();
 		if (this.dhClientWorld != null)
 		{
-			this.dhClientLevel = (IDhClientLevel) this.dhClientWorld.getLevel(clientLevelWrapper);
+			this.dhClientLevel = this.dhClientWorld.getOrLoadClientLevel(clientLevelWrapper);
 			if (this.dhClientLevel != null)
 			{
 				this.renderBufferHandler = this.dhClientLevel.getRenderBufferHandler();
@@ -176,45 +172,6 @@ public class RenderParams extends DhApiRenderParam
 		}
 		
 		
-		//// potential fix for a segfault when
-		//// Sodium and DH are running together
-		//if (EPlatform.get() == EPlatform.MACOS
-		//	&& !initialLoadingComplete)
-		//{
-		//	// Once MC starts rendering, wait a few seconds so
-		//	// MC/Sodium can finish their shader compiling before DH does its own.
-		//	// This will allow DH to compile its own shaders after Sodium finishes
-		//	// compiling its own.
-		//	long nowMs = System.currentTimeMillis();
-		//	long firstAllowedRenderTimeMs = firstRenderTimeMs + TIME_FOR_MAC_TO_FINISH_COMPILING_IN_MS;
-		//	if (nowMs < firstAllowedRenderTimeMs)
-		//	{
-		//		return "Waiting for initial MC compile...";
-		//	}
-		//	
-		//	
-		//	// null shouldn't happen, but just in case
-		//	PriorityTaskPicker.Executor renderLoadExecutor = ThreadPoolUtil.getRenderLoadingExecutor();
-		//	if (renderLoadExecutor == null)
-		//	{
-		//		return "Waiting for DH Threadpool...";
-		//	}
-		//	
-		//	// wait for DH to finish loading, by the time that's done
-		//	// java should have finished all of DH's JIT compiling,
-		//	// which will hopefully mean less concurrency and thus a lower
-		//	// chance of breaking
-		//	// (plus this gives Sodium/vanill a bit longer to finish their setup)
-		//	int taskCount = renderLoadExecutor.getQueueSize();
-		//	if (taskCount > 0)
-		//	{
-		//		return "Waiting for DH JIT compiling...";
-		//	}
-		//	
-		//	initialLoadingComplete = true;
-		//}
-		
-		
 		return null;
 	}
 	

core/src/main/java/com/seibel/distanthorizons/core/render/RenderThreadTaskHandler.java

@@ -10,6 +10,7 @@ import com.seibel.distanthorizons.core.util.TimerUtil;
 import com.seibel.distanthorizons.core.util.objects.RollingAverage;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftSharedWrapper;
 import com.seibel.distanthorizons.coreapi.ModInfo;
 import org.jetbrains.annotations.Nullable;
 
@@ -49,6 +50,14 @@ public class RenderThreadTaskHandler
 	
 	
 	private long nanoSinceTasksRun = System.nanoTime();
+	private final boolean running; 
+	
+	private Thread renderThread;
+	/** 
+	 * the currently running {@link QueuedRunnable}
+	 * will be null if nothing is running.
+	 */
+	private volatile @Nullable QueuedRunnable currentQueuedRunnable;
 	
 	
 	
@@ -57,7 +66,22 @@ public class RenderThreadTaskHandler
 	//=============//
 	//region
 	
-	private RenderThreadTaskHandler() { TIMER.scheduleAtFixedRate(TimerUtil.createTimerTask(this::manualCleanupTick), MS_BETWEEN_CLEANUP_TICKS, MS_BETWEEN_CLEANUP_TICKS); }
+	private RenderThreadTaskHandler() 
+	{
+		// we only want to run this when the client is available
+		IMinecraftSharedWrapper mcShared = SingletonInjector.INSTANCE.get(IMinecraftSharedWrapper.class);
+		if (!mcShared.isDedicatedServer())
+		{
+			LOGGER.debug("Starting ["+RenderThreadTaskHandler.class.getSimpleName()+"]...");
+			this.running = true;
+			TIMER.scheduleAtFixedRate(TimerUtil.createTimerTask(this::manualCleanupTick), MS_BETWEEN_CLEANUP_TICKS, MS_BETWEEN_CLEANUP_TICKS);
+		}
+		else
+		{
+			this.running = false;
+			LOGGER.debug("Skipping ["+RenderThreadTaskHandler.class.getSimpleName()+"] startup due to running on a dedicated server.");
+		}
+	}
 	
 	//endregion
 	
@@ -70,6 +94,13 @@ public class RenderThreadTaskHandler
 	
 	public void queueRunningOnRenderThread(String name, Runnable renderCall)
 	{
+		// don't queuing tasks if they'll never be run
+		if (!this.running)
+		{
+			return;
+		}
+		
+		
 		// don't get the stacktrace on release to reduce GC pressure
 		StackTraceElement[] stackTrace = null;
 		if (ModInfo.IS_DEV_BUILD)
@@ -116,12 +147,21 @@ public class RenderThreadTaskHandler
 		long loopStartTimeNano = System.nanoTime();
 		this.nanoSinceTasksRun = loopStartTimeNano;
 		
+		
+		if (this.renderThread == null)
+		{
+			this.renderThread = Thread.currentThread();
+		}
+		
+		
 		QueuedRunnable runnable = RENDER_THREAD_RUNNABLE_QUEUE.poll();
 		while(runnable != null)
 		{
 			long taskStartNano = System.nanoTime();
 			
+			this.currentQueuedRunnable = runnable;
 			runnable.run();
+			this.currentQueuedRunnable = null;
 			
 			// only try running for a limited amount of time to prevent lag spikes
 			long taskNano = System.nanoTime() - taskStartNano;
@@ -179,8 +219,19 @@ public class RenderThreadTaskHandler
 		// this means we could have GL jobs building up.
 		// Run the queued tasks on MC's executor (hopefully this should always run,
 		// even if DH's render code isn't being hit).
-		IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
-		MC.executeOnRenderThread(() -> this.runRenderThreadTasks(500 * 1_000_000L));
+		IMinecraftClientWrapper mcClient = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+		if (mcClient != null)
+		{
+			mcClient.executeOnRenderThread(() -> this.runRenderThreadTasks(500 * 1_000_000L));
+		}
+		else
+		{
+			// shouldn't happen, but just in case
+			
+			// somehow the timer started when there wasn't a client wrapper
+			// this probably means the timer was started on a dedicated server
+			RATE_LIMITED_LOGGER.warn("["+RenderThreadTaskHandler.class.getSimpleName()+"] timer started when ["+IMinecraftClientWrapper.class.getSimpleName()+"] is null. This shouldn't happen but can likely be ignored.");
+		}
 	}
 	
 	//endregion
@@ -190,7 +241,7 @@ public class RenderThreadTaskHandler
 	//===========//
 	// debugging //
 	//===========//
-	///region
+	//region
 	
 	/** 
 	 * if tasks are currently queued the debug
@@ -246,7 +297,28 @@ public class RenderThreadTaskHandler
 		});
 	}
 	
-	///endregion
+	
+	/** Returns true if the currently running thread is being run by this handler */
+	public boolean isCurrentThread() 
+	{
+		if (this.renderThread != null)
+		{
+			return Thread.currentThread() == this.renderThread;
+		}
+		
+		// shouldn't normally be needed, but can be used if this
+		// handler hasn't been run yet
+		return Thread.currentThread().getName().equals("Render thread");
+	}
+	
+	/** 
+	 * Only recommended to be used by the task that's currently being run.
+	 * Use {@link RenderThreadTaskHandler#isCurrentThread()} to check. <br>
+	 * Can be used to get stack traces for render thread tasks while they're being run. 
+	 */
+	public @Nullable QueuedRunnable getCurrentlyRunningTask() { return this.currentQueuedRunnable; }
+	
+	//endregion
 	
 	
 	
@@ -255,7 +327,7 @@ public class RenderThreadTaskHandler
 	//================//
 	//region
 	
-	private static class QueuedRunnable implements Runnable
+	public static class QueuedRunnable implements Runnable
 	{
 		/** used to easily track what's being done on the render thread */
 		public final String name;

core/src/main/java/com/seibel/distanthorizons/core/render/renderer/LodRenderer.java

@@ -26,6 +26,7 @@ import com.seibel.distanthorizons.core.dependencyInjection.ModAccessorInjector;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.logging.DhLogger;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.DhApiRenderProxy;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.RenderParams;
@@ -36,6 +37,8 @@ import com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor.IIrisAccess
 import com.seibel.distanthorizons.core.wrapperInterfaces.render.renderPass.*;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 
+import java.awt.*;
+
 /**
  * This is where all the magic happens. <br>
  * This is where LODs are draw to the world.
@@ -180,6 +183,24 @@ public class LodRenderer
 				renderBufferHandler.buildRenderList(renderParams);
 			}
 			
+			
+			boolean renderFog;
+			Boolean apiFogOverride = Config.Client.Advanced.Graphics.Fog.enableDhFog.getApiValue();
+			if (apiFogOverride != null)
+			{
+				// use whatever the API dictates if set
+				// (this could cause issues when underwater if a shader or something
+				// doesn't add their own, but that's relatively unlikely)
+				renderFog = apiFogOverride;
+			}
+			else
+			{
+				renderFog = Config.Client.Advanced.Graphics.Fog.enableDhFog.get();
+				// allow enabling fog when: underwater fog, blind, etc.
+				// otherwise LODs won't appear correctly
+				renderFog |= renderParams.vanillaFogEnabled;
+			}
+			
 			//endregion
 			
 			
@@ -207,8 +228,6 @@ public class LodRenderer
 				// opaque LODs
 				profiler.popPush("LOD Opaque");
 				
-				ApiEventInjector.INSTANCE.fireAllEvents(DhApiBeforeRenderPassEvent.class, renderParams);
-				
 				this.renderTerrain(this.terrainRenderer, renderBufferHandler, renderParams, /*opaquePass*/ true, profiler);
 				
 				// custom objects with SSAO
@@ -249,9 +268,8 @@ public class LodRenderer
 				}
 				
 				// fog
-				if (Config.Client.Advanced.Graphics.Fog.enableDhFog.get()
-					// this is done to fix issues with: underwater fog, blindness effect, etc.
-					|| renderParams.vanillaFogEnabled)
+				
+				if (renderFog)
 				{
 					profiler.popPush("LOD Fog");
 					
@@ -273,6 +291,22 @@ public class LodRenderer
 				}
 				
 				
+				if (Config.Client.Advanced.Debugging.PositionFinder.positionFinderEnable.get())
+				{
+					// can be used to find specific positions when debugging
+					this.debugWireframeRenderer.renderBox(new AbstractDebugWireframeRenderer.Box(
+						DhSectionPos.encode(
+							Config.Client.Advanced.Debugging.PositionFinder.positionFinderDetailLevel.get().byteValue(),
+							Config.Client.Advanced.Debugging.PositionFinder.positionFinderXPos.get(),
+							Config.Client.Advanced.Debugging.PositionFinder.positionFinderZPos.get()),
+						Config.Client.Advanced.Debugging.PositionFinder.positionFinderMinBlockY.get(),
+						Config.Client.Advanced.Debugging.PositionFinder.positionFinderMaxBlockY.get(),
+						Config.Client.Advanced.Debugging.PositionFinder.positionFinderMarginPercent.get(),
+						Color.GREEN
+					));
+				}
+				
+				
 				
 				//=============================//
 				// Apply to the MC Framebuffer //
@@ -294,15 +328,11 @@ public class LodRenderer
 				
 				if (Config.Client.Advanced.Graphics.Quality.transparency.get().transparencyEnabled)
 				{
-					ApiEventInjector.INSTANCE.fireAllEvents(DhApiBeforeRenderPassEvent.class, renderParams);
-					
 					profiler.popPush("LOD Transparent");
 					this.renderTerrain(this.terrainRenderer, renderBufferHandler, renderParams, /*opaquePass*/ false, profiler);
 					
 					
-					if (Config.Client.Advanced.Graphics.Fog.enableDhFog.get()
-						// this is done to fix issues with: underwater fog, blindness effect, etc.
-						|| renderParams.vanillaFogEnabled)
+					if (renderFog)
 					{
 						profiler.popPush("LOD Fog");
 						

core/src/main/java/com/seibel/distanthorizons/core/util/ExceptionUtil.java

@@ -25,6 +25,7 @@ public class ExceptionUtil
 		return throwable instanceof InterruptedException
 				|| throwable instanceof UncheckedInterruptedException
 				|| throwable instanceof RejectedExecutionException
+				|| throwable instanceof CancellationException
 				|| throwable instanceof ClosedByInterruptException;
 	}
 	
@@ -37,8 +38,8 @@ public class ExceptionUtil
 				unwrapped instanceof CancellationException;
 	}
 	public static Throwable ensureUnwrap(Throwable t)
-	{
-		return t instanceof CompletionException ? ensureUnwrap(t.getCause()) : t;
-	}
+	{ return t instanceof CompletionException ? ensureUnwrap(t.getCause()) : t; }
+	
+	
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/util/RenderDataPointReducingList.java

@@ -451,6 +451,21 @@ public class RenderDataPointReducingList extends AbstractPhantomArrayList
 			this.setBigger(smaller, bigger);
 		}
 		
+		if (writeIndex == 0)
+		{
+			// if every data point in the list is NULL (0) the write index will be 0,
+			// and in order to prevent accessing index -1 below, 
+			// setting the write index to 1 is needed.
+			
+			// This shouldn't happen normally, however if the lod data is slightly malformed
+			// (which is specifically the case for the commonly shared wyncraft LODs)
+			// this check is needed.
+			// It would probably be best to fix the 6 or so NULL datapoints that are next
+			// to each other in the full data source, but for now this fix works.
+			
+			writeIndex = 1;
+		}
+		
 		this.smallest = this.sortingArray.getShort(0);
 		this.biggest = this.sortingArray.getShort(writeIndex - 1);
 		this.setSmaller(this.getSmallest(), NULL);

core/src/main/java/com/seibel/distanthorizons/core/util/RenderDataPointUtil.java

@@ -247,10 +247,7 @@ public class RenderDataPointUtil
 		{
 			return "Y+:" + getYMax(dataPoint) +
 					" Y-:" + getYMin(dataPoint) +
-					" argb:" + getAlpha(dataPoint) + " " +
-					getRed(dataPoint) + " " +
-					getGreen(dataPoint) + " " +
-					getBlue(dataPoint) +
+					" argb:" + getAlpha(dataPoint) + "," + getRed(dataPoint) + "," + getGreen(dataPoint) + "," + getBlue(dataPoint) +
 					" BL:" + getLightBlock(dataPoint) +
 					" SL:" + getLightSky(dataPoint) +
 					" MAT:" + getBlockMaterialId(dataPoint) + "["+ EDhApiBlockMaterial.getFromIndex(getBlockMaterialId(dataPoint))+"]";

core/src/main/java/com/seibel/distanthorizons/core/util/RenderUtil.java

@@ -123,7 +123,16 @@ public class RenderUtil
 			// At low render distances this hides the vanilla RD border
 			
 			int chunkRenderDistance = MC_RENDER.getRenderDistance();
-			if (chunkRenderDistance <= 2)
+			
+			if (IRIS_ACCESSOR != null
+				&& IRIS_ACCESSOR.isShaderPackInUse())
+			{
+				// shaders handle the near clip plane/overdraw differently, best to play it
+				// safe and have the plane really close otherwise
+				// there might be cutouts on the screen edges
+				overdraw = 0.2f;
+			}
+			else if (chunkRenderDistance <= 2)
 			{
 				overdraw = 0.2f;
 			}
@@ -154,7 +163,7 @@ public class RenderUtil
 		
 		if (Config.Client.Advanced.Graphics.Culling.reduceOverdrawWithFastMovement.get())
 		{
-			double avgSpeed = ClientApi.INSTANCE.cameraSpeedRollingAverage.getAverage();
+			double avgSpeed = ClientApi.INSTANCE.getAvgCameraSpeed();
 			if (avgSpeed >= DynamicOverdraw.MIN_SPEED)
 			{
 				// if the player is moving fast enough,

core/src/main/java/com/seibel/distanthorizons/core/util/objects/pooling/PhantomArrayListPool.java

@@ -331,7 +331,7 @@ public class PhantomArrayListPool
 							if (pool.logGarbageCollectedStacks
 								&& checkout.allocationStackTrace != null) // stack trace shouldn't be null, but just in case
 							{
-								putAndIncrementTrackingString(checkout.allocationStackTrace, allocationStackTraceCountPairList);
+								PhantomLoggingHelper.putAndIncrementTrackingString(checkout.allocationStackTrace, allocationStackTraceCountPairList);
 							}
 						}
 						else
@@ -363,18 +363,7 @@ public class PhantomArrayListPool
 							// log stack traces if present
 							if (pool.logGarbageCollectedStacks)
 							{
-								// high numbers first
-								allocationStackTraceCountPairList.sort((a, b) -> Integer.compare(b.second.get(), a.second.get()));
-								
-								StringBuilder stringBuilder = new StringBuilder();
-								for (int j = 0; j < allocationStackTraceCountPairList.size(); j++)
-								{
-									int count = allocationStackTraceCountPairList.get(j).second.get();
-									String stack = allocationStackTraceCountPairList.get(j).first;
-									
-									stringBuilder.append(count).append(". ").append(stack).append("\n");
-								}
-								LOGGER.warn("Stacks: ["+ allocationStackTraceCountPairList.size()+"]\n" + stringBuilder.toString());
+								PhantomLoggingHelper.LogAllocationStackTracePairCounts(LOGGER, allocationStackTraceCountPairList);
 							}
 						}
 					}
@@ -389,36 +378,6 @@ public class PhantomArrayListPool
 			}
 		}
 	}
-	/**
-	 * This was separated out so it could be used for other string pair lists.
-	 * James originally had an idea to add a shorter static string
-	 * ID to each allocated {@link PhantomArrayListCheckout} as a simpler version of the stack trace,
-	 * however it became a bit more difficult and messy than he wanted to deal with, so for now we just
-	 * have the stack trace.
-	 */
-	private static void putAndIncrementTrackingString(
-			String key,
-			ArrayList<Pair<String, AtomicInteger>> allocationStackTraceCountPairList)
-	{
-		// sequential search, for the number of elements we're dealing with (less than 20)
-		// this should be sufficiently fast
-		boolean pairFound = false;
-		for (int i = 0; i < allocationStackTraceCountPairList.size(); i++)
-		{
-			Pair<String, AtomicInteger> possiblePair = allocationStackTraceCountPairList.get(i);
-			if (possiblePair.first.equals(key))
-			{
-				possiblePair.second.getAndIncrement();
-				pairFound = true;
-				break;
-			}
-		}
-		
-		if (!pairFound)
-		{
-			allocationStackTraceCountPairList.add(new Pair<>(key, new AtomicInteger(1)));
-		}
-	}
 	
 	///endregion
 	

core/src/main/java/com/seibel/distanthorizons/core/util/objects/pooling/PhantomLoggingHelper.java

@@ -0,0 +1,232 @@
+package com.seibel.distanthorizons.core.util.objects.pooling;
+
+import com.seibel.distanthorizons.core.logging.DhLogger;
+import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.logging.f3.F3Screen;
+import com.seibel.distanthorizons.core.util.ThreadUtil;
+import com.seibel.distanthorizons.core.util.objects.Pair;
+
+import java.lang.ref.PhantomReference;
+import java.lang.ref.Reference;
+import java.lang.ref.ReferenceQueue;
+import java.util.ArrayList;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class PhantomLoggingHelper
+{
+	/**
+	 * This was separated out so it could be used for other string pair lists.
+	 * James originally had an idea to add a shorter static string
+	 * ID to each allocated {@link PhantomArrayListCheckout} as a simpler version of the stack trace,
+	 * however it became a bit more difficult and messy than he wanted to deal with, so for now we just
+	 * have the stack trace.
+	 */
+	public static void putAndIncrementTrackingString(
+		String key,
+		ArrayList<Pair<String, AtomicInteger>> allocationStackTraceCountPairList)
+	{
+		// sequential search, for the number of elements we're dealing with (less than 20)
+		// this should be sufficiently fast
+		boolean pairFound = false;
+		for (int i = 0; i < allocationStackTraceCountPairList.size(); i++)
+		{
+			Pair<String, AtomicInteger> possiblePair = allocationStackTraceCountPairList.get(i);
+			if (possiblePair.first.equals(key))
+			{
+				possiblePair.second.getAndIncrement();
+				pairFound = true;
+				break;
+			}
+		}
+		
+		if (!pairFound)
+		{
+			allocationStackTraceCountPairList.add(new Pair<>(key, new AtomicInteger(1)));
+		}
+	}
+	
+	public static void LogAllocationStackTracePairCounts(DhLogger logger, ArrayList<Pair<String, AtomicInteger>> allocationStackTraceCountPairList)
+	{
+		// high numbers first
+		allocationStackTraceCountPairList.sort((a, b) -> Integer.compare(b.second.get(), a.second.get()));
+		
+		StringBuilder stringBuilder = new StringBuilder();
+		for (int j = 0; j < allocationStackTraceCountPairList.size(); j++)
+		{
+			int count = allocationStackTraceCountPairList.get(j).second.get();
+			String stack = allocationStackTraceCountPairList.get(j).first;
+			
+			stringBuilder.append(count).append(". ").append(stack).append("\n");
+		}
+		logger.warn("Stacks: ["+ allocationStackTraceCountPairList.size()+"]\n" + stringBuilder.toString());
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	//region
+	
+	/**
+	 * Can be quickly added to a {@link AutoCloseable} implementing
+	 * class to confirm it's being properly closed.
+	 */
+	public static class BasicPhantomReference implements AutoCloseable
+	{
+		private static final DhLogger LOGGER = new DhLoggerBuilder().build();
+		
+		/** if enabled the number of GC'ed buffers will be logged */
+		private static final boolean LOG_PHANTOM_RECOVERY = true;
+		/**
+		 * If enabled the GC'ed buffers allocation/upload stacks will be logged. 
+		 * Note: due to how the buffers are often run on the render thread,
+		 * these stacks will likely only be of limited use.
+		 * For more robust debugging it would likely be best to somehow track
+		 * the stacks of where these calls are happening before they're queued
+		 * for the render thread.
+		 */
+		private static final boolean LOG_PHANTOM_ALLOCATION_STACKS = true;
+		
+		private static final int PHANTOM_REF_CHECK_TIME_IN_MS = 5 * 1000;
+		private static final ReferenceQueue<BasicPhantomReference> PHANTOM_REFERENCE_QUEUE = new ReferenceQueue<>();
+		private static final ConcurrentHashMap<PhantomReference<? extends BasicPhantomReference>, Class<?>> PHANTOM_TO_PARENT_CLASS = new ConcurrentHashMap<>();
+		
+		private static final ThreadPoolExecutor CLEANUP_THREAD = ThreadUtil.makeSingleDaemonThreadPool("BasicPhantom Cleanup");
+		
+		
+		private final Class<?> parentClass;
+		private final PhantomReference<? extends BasicPhantomReference> phantomReference; 
+		
+		
+		
+		//==============//
+		// constructors //
+		//==============//
+		//region
+		
+		static { CLEANUP_THREAD.execute(() -> runPhantomReferenceCleanupLoop()); }
+		
+		public BasicPhantomReference(Class<?> parentClass)
+		{
+			this.parentClass = parentClass;
+			this.phantomReference = new PhantomReference<>(this, PHANTOM_REFERENCE_QUEUE);
+			PHANTOM_TO_PARENT_CLASS.put(this.phantomReference, this.parentClass);
+		}
+		
+		//endregion
+		
+		
+		
+		//================//
+		// base overrides //
+		//================//
+		//region
+		
+		@Override 
+		public void close()
+		{
+			this.phantomReference.clear();
+			PHANTOM_TO_PARENT_CLASS.remove(this.phantomReference);
+		}
+		
+		//endregion
+		
+		
+		
+		//================//
+		// static cleanup //
+		//================//
+		//region
+		
+		private static void runPhantomReferenceCleanupLoop()
+		{
+			// these arrays are stored here so they don't have to be re-allocated each loop
+			ArrayList<Pair<String, AtomicInteger>> allocationStackTraceCountPairList = new ArrayList<>();
+			ArrayList<Pair<String, AtomicInteger>> parentClassNameCountPairList = new ArrayList<>();
+			
+			while (true)
+			{
+				allocationStackTraceCountPairList.clear();
+				parentClassNameCountPairList.clear();
+				
+				try
+				{
+					try
+					{
+						Thread.sleep(PHANTOM_REF_CHECK_TIME_IN_MS);
+					}
+					catch (InterruptedException ignore) { }
+					
+					int collectedCount = 0;
+					
+					Reference<? extends BasicPhantomReference> phantomRef = PHANTOM_REFERENCE_QUEUE.poll();
+					while (phantomRef != null)
+					{
+						// destroy the buffer if it hasn't been cleared yet
+						Class<?> parentClass = PHANTOM_TO_PARENT_CLASS.remove((PhantomReference<? extends BasicPhantomReference>)phantomRef); // cast to make IntelliJ happy
+						{
+							String parentClassName = "NULL";
+							if (parentClass != null)
+							{
+								parentClassName = parentClass.getSimpleName();
+							}
+							
+							PhantomLoggingHelper.putAndIncrementTrackingString(parentClassName, parentClassNameCountPairList);
+							//LOGGER.info("Phantom collected for class: [" + parentClassName + "]");
+						}
+							
+						
+						//if (LOG_PHANTOM_ALLOCATION_STACKS) // stack trace shouldn't be null, but just in case
+						//{
+						//	String stack = BUFFER_ID_TO_ALLOCATION_STRING.get(idRef);
+						//	if (stack != null)
+						//	{
+						//		PhantomLoggingHelper.putAndIncrementTrackingString(stack, allocationStackTraceCountPairList);
+						//	}
+						//}
+						
+						
+						collectedCount++;
+						phantomRef = PHANTOM_REFERENCE_QUEUE.poll();
+					}
+					
+					
+					
+					if (LOG_PHANTOM_RECOVERY)
+					{
+						// we only want to log when something has been returned
+						if (collectedCount != 0)
+						{
+							LOGGER.warn("Phantoms collected: ["+ F3Screen.NUMBER_FORMAT.format(collectedCount)+"].");
+							
+							PhantomLoggingHelper.LogAllocationStackTracePairCounts(LOGGER, parentClassNameCountPairList);
+							
+							//// log stack traces if present
+							//if (LOG_PHANTOM_ALLOCATION_STACKS)
+							//{
+							//	PhantomLoggingHelper.LogAllocationStackTracePairCounts(LOGGER, allocationStackTraceCountPairList);
+							//}
+						}
+					}
+					
+				}
+				catch (Exception e)
+				{
+					LOGGER.error("Unexpected error in buffer cleanup thread: [" + e.getMessage() + "].", e);
+				}
+			}
+		}
+		
+		//endregion
+		
+		
+	}
+	
+	//endregion
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/util/objects/quadTree/QuadNode.java

@@ -325,7 +325,7 @@ public class QuadNode<T>
 	
 	public void deleteAllChildren() { this.deleteAllChildren(null); }
 	/** @param removedItemConsumer is only fired for non-null nodes, however the value passed in may be null */
-	public void deleteAllChildren(Consumer<? super T> removedItemConsumer)
+	public void deleteAllChildren(@Nullable Consumer<? super T> removedItemConsumer)
 	{
 		for (int i = 0; i < 4; i++)
 		{

core/src/main/java/com/seibel/distanthorizons/core/util/objects/quadTree/QuadTree.java

@@ -19,10 +19,12 @@
 
 package com.seibel.distanthorizons.core.util.objects.quadTree;
 
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.logging.DhLogger;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
+import com.seibel.distanthorizons.core.render.QuadTree.LodQuadTree;
 import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.coreapi.util.BitShiftUtil;
 import com.seibel.distanthorizons.coreapi.util.MathUtil;
@@ -61,6 +63,11 @@ public class QuadTree<T>
 	private final MovableGridRingList<QuadNode<T>> topRingList;
 	
 	private DhBlockPos2D centerBlockPos;
+	/** 
+	 * defines how many blocks the center needs to move in blocks
+	 * before we check for out-of-bound nodes.
+	 */
+	private int blockDistanceForNodeClearing;
 	
 	
 	
@@ -74,10 +81,13 @@ public class QuadTree<T>
 	 *
 	 * @param diameterInBlocks equivalent to the distance between the two opposing sides
 	 */
-	public QuadTree(int diameterInBlocks, DhBlockPos2D centerBlockPos, byte treeLeafDetailLevel)
+	public QuadTree(
+		int diameterInBlocks, int blockDistanceForNodeClearing,
+		DhBlockPos2D centerBlockPos, byte treeLeafDetailLevel)
 	{
 		this.centerBlockPos = centerBlockPos;
 		this.diameterInBlocks = diameterInBlocks;
+		this.blockDistanceForNodeClearing = blockDistanceForNodeClearing;
 		
 		this.treeLeafDetailLevel = treeLeafDetailLevel;
 		// the min detail level must be greater than 0 (to prevent divide by 0 errors) and greater than the maximum detail level
@@ -130,18 +140,22 @@ public class QuadTree<T>
 	public int leafNodeCount()
 	{
 		int count = 0;
-		for (QuadNode<T> node : this.topRingList)
+		for (QuadNode<T> rootNode : this.topRingList)
 		{
-			if (node == null)
+			if (rootNode == null)
 			{
 				continue;
 			}
 			
-			Iterator<QuadNode<T>> leafNodeIterator = node.getLeafNodeIterator();
+			Iterator<QuadNode<T>> leafNodeIterator = rootNode.getLeafNodeIterator();
 			while (leafNodeIterator.hasNext())
 			{
-				leafNodeIterator.next();
-				count++;
+				QuadNode<T> node = leafNodeIterator.next();
+				if (node != null
+					&& this.isSectionPosInBounds(node.sectionPos))
+				{
+					count++;
+				}
 			}
 		}
 		
@@ -236,32 +250,32 @@ public class QuadTree<T>
 		int ringListPosX = DhSectionPos.getX(rootPos);
 		int ringListPosZ = DhSectionPos.getZ(rootPos);
 		
-		QuadNode<T> topQuadNode = this.topRingList.get(ringListPosX, ringListPosZ);
-		if (topQuadNode == null)
+		QuadNode<T> rootQuadNode = this.topRingList.get(ringListPosX, ringListPosZ);
+		if (rootQuadNode == null)
 		{
 			if (!setNewValue)
 			{
 				return null;
 			}
 			
-			topQuadNode = new QuadNode<T>(rootPos, this.treeLeafDetailLevel);
-			boolean successfullyAdded = this.topRingList.set(ringListPosX, ringListPosZ, topQuadNode);
+			rootQuadNode = new QuadNode<T>(rootPos, this.treeLeafDetailLevel);
+			boolean successfullyAdded = this.topRingList.set(ringListPosX, ringListPosZ, rootQuadNode);
 			if (!successfullyAdded)
 			{
-				LodUtil.assertNotReach("Failed to add top quadTree node at position: " + rootPos);
+				LodUtil.assertNotReach("Failed to add root quadTree node at position: ["+DhSectionPos.toString(rootPos)+"]");
 			}
 		}
 		
-		if (!DhSectionPos.contains(topQuadNode.sectionPos, pos))
+		if (!DhSectionPos.contains(rootQuadNode.sectionPos, pos))
 		{
-			LodUtil.assertNotReach("failed to get a root node that contains the input position: " + pos + " root node pos: " + topQuadNode.sectionPos);
+			LodUtil.assertNotReach("failed to get a root node that contains the input position: " + pos + " root node pos: " + rootQuadNode.sectionPos);
 		}
 		
 		
-		QuadNode<T> returnNode = topQuadNode.getNode(pos);
+		QuadNode<T> returnNode = rootQuadNode.getNode(pos);
 		if (setNewValue)
 		{
-			topQuadNode.setValue(pos, newValue);
+			rootQuadNode.setValue(pos, newValue);
 		}
 		return returnNode;
 	}
@@ -354,32 +368,103 @@ public class QuadTree<T>
 	//================//
 	//region
 	
-	public void setCenterBlockPos(DhBlockPos2D newCenterPos) { this.setCenterBlockPos(newCenterPos, null); }
-	public void setCenterBlockPos(DhBlockPos2D newCenterPos, Consumer<? super T> removedItemConsumer)
+	public void setCenterBlockPos(DhBlockPos2D newCenterPos) { this.setCenterBlockPos(newCenterPos, null, null); }
+	/**
+	 * @param removedConsumer fired when a root node is completely removed from the underlying data structure
+	 * @param mutateOutOfBoundConsumer fired when a child node is out of bounds, but not removed from the underlying data structure
+	 */
+	public void setCenterBlockPos(
+		DhBlockPos2D newCenterPos, 
+		@Nullable Consumer<? super T> removedConsumer, 
+		@Nullable Consumer<? super T> mutateOutOfBoundConsumer)
 	{
-		this.centerBlockPos = newCenterPos;
-		
-		MovableGridRingList.Pos2D expectedCenterPos = new MovableGridRingList.Pos2D(
-				BitShiftUtil.divideByPowerOfTwo(this.centerBlockPos.x, this.treeRootDetailLevel),
-				BitShiftUtil.divideByPowerOfTwo(this.centerBlockPos.z, this.treeRootDetailLevel));
-		
-		if (this.topRingList.getCenter().equals(expectedCenterPos))
+		// did we move significantly?
+		boolean ringListMoved = false;
+		int newCenterPosX = BitShiftUtil.divideByPowerOfTwo(newCenterPos.x, this.treeRootDetailLevel);
+		int newCenterPosZ = BitShiftUtil.divideByPowerOfTwo(newCenterPos.z, this.treeRootDetailLevel);
+		if (this.topRingList.getCenter().getX() != newCenterPosX
+			|| this.topRingList.getCenter().getY() != newCenterPosZ)
 		{
-			// tree doesn't need to be moved
+			ringListMoved = true;
+		}
+		
+		// did we move a little bit?
+		boolean recalculateOutOfBoundNodes = false;
+		int centerBlockDistance = this.centerBlockPos.manhattanDist(newCenterPos);
+		if (centerBlockDistance >= this.blockDistanceForNodeClearing)
+		{
+			recalculateOutOfBoundNodes = true;
+		}
+		
+		if (!ringListMoved
+			&& !recalculateOutOfBoundNodes)
+		{
+			// the tree didn't move enough that we need
+			// to re-calculate anything
 			return;
 		}
 		
 		
-		// remove out of bounds root nodes
-		this.topRingList.moveTo(expectedCenterPos.getX(), expectedCenterPos.getY(), (quadNode) ->
+		
+		this.centerBlockPos = newCenterPos;
+		
+		// remove out of bound root nodes
+		this.topRingList.moveTo(newCenterPosX, newCenterPosZ, (quadNode) ->
 		{
-			if (quadNode != null && removedItemConsumer != null)
+			if (quadNode != null)
 			{
-				quadNode.deleteAllChildren(removedItemConsumer);
+				quadNode.deleteAllChildren(removedConsumer);
 				
-				removedItemConsumer.accept(quadNode.value);
+				if (removedConsumer != null)
+				{
+					removedConsumer.accept(quadNode.value);
+				}
 			}
 		});
+		
+		// mutate out of bound child nodes
+		this.topRingList.forEach((rootNode) ->
+		{
+			this.mutateOutOfBoundChildNodes(rootNode, mutateOutOfBoundConsumer);
+		});
+	}
+	/** 
+	 * we don't want to actually remove nodes or node data 
+	 * since that can cause the {@link LodQuadTree} to
+	 * flash low-detail LODs when moving into previously-loaded
+	 * LODs, which is really disorienting.
+	 */
+	private void mutateOutOfBoundChildNodes(@Nullable QuadNode<T> quadNode, @Nullable Consumer<? super T> mutateOutOfBoundConsumer)
+	{
+		// nodes shouldn't be null, but just in case
+		if (quadNode == null)
+		{
+			return;
+		}
+		
+		// go over each child node
+		for (int i = 0; i < 4; i++)
+		{
+			QuadNode<T> childNode = quadNode.getChildByIndex(i);
+			if (childNode == null
+				|| childNode.value == null)
+			{
+				// no need to go any deeper if this node is already empty
+				continue;
+			}
+			
+			// mutate nodes from the bottom up
+			this.mutateOutOfBoundChildNodes(childNode, mutateOutOfBoundConsumer);
+			
+			// mutate this node if out of bounds
+			if (!this.isSectionPosInBounds(childNode.sectionPos))
+			{
+				if (mutateOutOfBoundConsumer != null)
+				{
+					mutateOutOfBoundConsumer.accept(childNode.value);
+				}
+			}
+		}
 	}
 	
 	public final DhBlockPos2D getCenterBlockPos() { return this.centerBlockPos; }
@@ -484,7 +569,7 @@ public class QuadTree<T>
 	
 	private class QuadTreeNodeIterator implements Iterator<QuadNode<T>>
 	{
-		private final QuadTreeRootPosIterator rootNodeIterator;
+		private final QuadTreeRootPosIterator rootNodePosIterator;
 		private Iterator<QuadNode<T>> currentNodeIterator;
 		
 		private QuadNode<T> lastNode = null;
@@ -497,7 +582,7 @@ public class QuadTree<T>
 		
 		public QuadTreeNodeIterator(boolean onlyReturnLeaves, @Nullable INodeIteratorStoppingFunc<T> stopIteratingFunc)
 		{
-			this.rootNodeIterator = new QuadTreeRootPosIterator(false, stopIteratingFunc);
+			this.rootNodePosIterator = new QuadTreeRootPosIterator(false, stopIteratingFunc);
 			this.onlyReturnLeaves = onlyReturnLeaves;
 			
 			this.stopIteratingFunc = stopIteratingFunc;
@@ -508,7 +593,7 @@ public class QuadTree<T>
 		@Override
 		public boolean hasNext()
 		{
-			if (!this.rootNodeIterator.hasNext() 
+			if (!this.rootNodePosIterator.hasNext() 
 				&& this.currentNodeIterator != null 
 				&& !this.currentNodeIterator.hasNext())
 			{
@@ -544,9 +629,9 @@ public class QuadTree<T>
 		{
 			Iterator<QuadNode<T>> nodeIterator = null;
 			while ((nodeIterator == null || !nodeIterator.hasNext()) 
-					&& this.rootNodeIterator.hasNext())
+					&& this.rootNodePosIterator.hasNext())
 			{
-				long sectionPos = this.rootNodeIterator.nextLong();
+				long sectionPos = this.rootNodePosIterator.nextLong();
 				
 				// try-get to prevent concurrency errors if the tree is being moved while we walk through it
 				QuadNode<T> rootNode = QuadTree.this.tryGetNode(sectionPos);

core/src/main/java/com/seibel/distanthorizons/core/util/threading/RateLimitedThreadPoolExecutor.java

@@ -73,10 +73,17 @@ public class RateLimitedThreadPoolExecutor extends ThreadPoolExecutor
 	{
 		super.afterExecute(runnable, throwable);
 		
+		double ratio = this.runTimeRatioConfig.get();
+		if (ratio >= 1.0)
+		{
+			// Avoid sleeping for 0 time
+			return;
+		}
+		
 		try
 		{
 			long runTime = System.nanoTime() - this.runStartTime.get();
-			Thread.sleep(TimeUnit.NANOSECONDS.toMillis((long) (runTime / this.runTimeRatioConfig.get() - runTime)));
+			Thread.sleep(TimeUnit.NANOSECONDS.toMillis((long) (runTime / ratio - runTime)));
 		}
 		catch (InterruptedException ignore)
 		{

core/src/main/java/com/seibel/distanthorizons/core/util/threading/ThreadPoolUtil.java

@@ -170,7 +170,7 @@ public class ThreadPoolUtil
 	 */
 	public static boolean worldGenThreadsCanRun()
 	{
-		double cameraSpeed = ClientApi.INSTANCE.cameraSpeedRollingAverage.getAverage();
+		double cameraSpeed = ClientApi.INSTANCE.getAvgCameraSpeed();
 		// stop these threads if moving a little bit slower than max elytra speed
 		double maxAllowedSpeed = (LodUtil.ROCKET_ELYTRA_SPEED_IN_BLOCKS_PER_SEC - 10.0);
 		if (cameraSpeed > maxAllowedSpeed)

core/src/main/java/com/seibel/distanthorizons/core/world/AbstractDhServerWorld.java

@@ -1,5 +1,6 @@
 package com.seibel.distanthorizons.core.world;
 
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
 import com.seibel.distanthorizons.core.file.structure.LocalSaveStructure;
 import com.seibel.distanthorizons.core.level.AbstractDhServerLevel;
 import com.seibel.distanthorizons.core.level.IDhLevel;
@@ -8,6 +9,7 @@ import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerStateManag
 import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
@@ -138,6 +140,7 @@ public abstract class AbstractDhServerWorld<TDhServerLevel extends AbstractDhSer
 			if (serverLevelWrapper != null)
 			{
 				serverLevelWrapper.onUnload();
+				ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(serverLevelWrapper));
 			}
 			
 			

core/src/main/java/com/seibel/distanthorizons/core/world/AbstractDhWorld.java

@@ -64,7 +64,7 @@ public abstract class AbstractDhWorld implements IDhWorld, Closeable
 		String levelCountStr = F3Screen.NUMBER_FORMAT.format(this.getLoadedLevelCount());
 		
 		String readOnlyStr = "";
-		if (DhApiWorldProxy.INSTANCE.getReadOnly())
+		if (DhApiWorldProxy.INSTANCE.tryGetReadOnly())
 		{
 			readOnlyStr += " - ReadOnly";
 		}

core/src/main/java/com/seibel/distanthorizons/core/world/DhApiWorldProxy.java

@@ -113,6 +113,23 @@ public class DhApiWorldProxy implements IDhApiWorldProxy
 		return this.isReadOnly; 
 	}
 	
+	/** 
+	 * Returns false if no world is loaded.
+	 * Can be used in places where the world state might be a bit more questionable
+	 * without having to worry about the {@link IllegalStateException} thrown by
+	 * {@link DhApiWorldProxy#getReadOnly()}
+	 */
+	public boolean tryGetReadOnly()
+	{
+		if (SharedApi.getAbstractDhWorld() == null)
+		{
+			// no world is loaded, use the default value for the next world
+			return false;
+		}
+		
+		return this.isReadOnly;
+	}
+	
 	
 	
 	//================//

core/src/main/java/com/seibel/distanthorizons/core/world/DhClientServerWorld.java

@@ -19,6 +19,8 @@
 
 package com.seibel.distanthorizons.core.world;
 
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelLoadEvent;
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
 import com.seibel.distanthorizons.core.api.internal.ClientApi;
 import com.seibel.distanthorizons.core.enums.MinecraftTextFormat;
 import com.seibel.distanthorizons.core.level.DhClientServerLevel;
@@ -27,6 +29,7 @@ import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.*;
@@ -34,7 +37,7 @@ import java.util.concurrent.CompletableFuture;
 
 public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLevel> implements IDhClientWorld
 {
-	private final Set<DhClientServerLevel> dhLevels = Collections.synchronizedSet(new HashSet<>());
+	private final Map<DhClientServerLevel, Set<ILevelWrapper>> dhLevels = Collections.synchronizedMap(new HashMap<>());
 	
 	private final Timer clientTickTimer = TimerUtil.CreateTimer("ClientTickTimer");
 	
@@ -54,7 +57,7 @@ public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLev
 			@Override 
 			public void run()
 			{
-				DhClientServerWorld.this.dhLevels.forEach(DhClientServerLevel::clientTick);
+				DhClientServerWorld.this.dhLevels.keySet().forEach(DhClientServerLevel::clientTick);
 			}
 		}, 0, IDhClientWorld.TICK_RATE_IN_MS);
 	}
@@ -75,7 +78,8 @@ public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLev
 				try
 				{
 					DhClientServerLevel level = new DhClientServerLevel(this.saveStructure, (IServerLevelWrapper) levelWrapper, this.getServerPlayerStateManager());
-					this.dhLevels.add(level);
+					this.dhLevels.computeIfAbsent(level, k -> Collections.synchronizedSet(new HashSet<>()));
+					ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(wrapper));
 					return level;
 				}
 				catch (Exception e)
@@ -92,6 +96,10 @@ public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLev
 		}
 		else
 		{
+			if (wrapper instanceof IClientLevelWrapper)
+			{
+				((IClientLevelWrapper) wrapper).markAccessed();
+			}
 			return this.dhLevelByLevelWrapper.computeIfAbsent(wrapper, (levelWrapper) ->
 			{
 				IClientLevelWrapper clientLevelWrapper = (IClientLevelWrapper) levelWrapper;
@@ -111,13 +119,14 @@ public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLev
 				
 				level.startRenderer();
 				clientLevelWrapper.setDhLevel(level);
+				dhLevels.get(level).add(wrapper);
 				return level;
 			});
 		}
 	}
 	
 	@Override
-	public void unloadLevel(@NotNull ILevelWrapper wrapper)
+	public boolean unloadLevel(@NotNull ILevelWrapper wrapper)
 	{
 		if (this.dhLevelByLevelWrapper.containsKey(wrapper))
 		{
@@ -135,9 +144,18 @@ public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLev
 				// If the level wrapper is a Client Level Wrapper, then that means the client side leaves the level,
 				// but note that the server side still has the level loaded. So, we don't want to unload the level,
 				// we just want to stop rendering it.
-				this.dhLevelByLevelWrapper.remove(wrapper).stopRenderer(); // Ignore resource warning. The level obj is referenced elsewhere.
+				DhClientServerLevel level = this.dhLevelByLevelWrapper.remove(wrapper); // Ignore resource warning. The level obj is referenced elsewhere.
+				Set<ILevelWrapper> wrappers = dhLevels.get(level);
+				if (wrappers != null) wrappers.remove(wrapper);
+				if ((wrappers == null || wrappers.isEmpty()) && level.isRendering()) {
+					level.stopRenderer();
+				}
+				wrapper.onUnload(); // We still want to unload the wrapper though.
 			}
+			ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(wrapper));
+			return true;
 		}
+		return false;
 	}
 	
 	
@@ -155,13 +173,21 @@ public class DhClientServerWorld extends AbstractDhServerWorld<DhClientServerLev
 		synchronized (this.dhLevels)
 		{
 			// close each level
-			for (DhClientServerLevel level : this.dhLevels)
+			for (DhClientServerLevel level : this.dhLevels.keySet())
 			{
 				// level wrapper shouldn't be null, but just in case
 				IServerLevelWrapper serverLevelWrapper = level.getServerLevelWrapper();
 				if (serverLevelWrapper != null)
 				{
 					serverLevelWrapper.onUnload();
+					ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(serverLevelWrapper));
+				}
+				
+				IClientLevelWrapper clientLevelWrapper = level.getClientLevelWrapper();
+				if (clientLevelWrapper != null)
+				{
+					clientLevelWrapper.onUnload();
+					ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(clientLevelWrapper));
 				}
 				
 				// close levels asynchronously to speed up

core/src/main/java/com/seibel/distanthorizons/core/world/DhClientWorld.java

@@ -19,6 +19,8 @@
 
 package com.seibel.distanthorizons.core.world;
 
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelLoadEvent;
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
 import com.seibel.distanthorizons.core.api.internal.ClientApi;
 import com.seibel.distanthorizons.core.enums.MinecraftTextFormat;
 import com.seibel.distanthorizons.core.file.structure.ClientOnlySaveStructure;
@@ -28,18 +30,17 @@ import com.seibel.distanthorizons.core.multiplayer.client.ClientNetworkState;
 import com.seibel.distanthorizons.core.util.TimerUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
+import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Timer;
-import java.util.TimerTask;
+import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentHashMap;
 
 public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 {
-	private final ConcurrentHashMap<IClientLevelWrapper, DhClientLevel> levels;
+	private final ConcurrentHashMap<String, DhClientLevel> levels;
+	private final Map<String, Set<IClientLevelWrapper>> levelWrappers = new ConcurrentHashMap<>();
 	public final ClientOnlySaveStructure saveStructure;
 	public final ClientNetworkState networkState = new ClientNetworkState();
 	
@@ -76,6 +77,32 @@ public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 	// methods //
 	//=========//
 	
+	private DhClientLevel createClientLevel(@NotNull IClientLevelWrapper clientLevelWrapper) {
+		try
+		{
+			if (!ClientApi.INSTANCE.canLoadClientLevel(clientLevelWrapper))
+			{
+				return null;
+			}
+			
+			DhClientLevel level = new DhClientLevel(this.saveStructure, clientLevelWrapper, this.networkState);
+			levelWrappers.computeIfAbsent(clientLevelWrapper.getDhIdentifier(), k -> Collections.synchronizedSet(new HashSet<>())).add(clientLevelWrapper);
+			ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(clientLevelWrapper));
+			ClientApi.INSTANCE.loadWaitingChunksForLevel(clientLevelWrapper);
+			return level;
+		}
+		catch (Exception e)
+		{
+			LOGGER.fatal("Failed to load client level, error: ["+e.getMessage()+"].", e);
+			
+			ClientApi.INSTANCE.showChatMessageNextFrame(
+				MinecraftTextFormat.RED + "Distant Horizons: Client level loading failed." + MinecraftTextFormat.CLEAR_FORMATTING + "\n" +
+					"Unable to load level ["+clientLevelWrapper.getDhIdentifier()+"], LODs may not appear. See log for more information.");
+			
+			return null;
+		}
+	}
+	
 	@Override
 	public DhClientLevel getOrLoadLevel(@NotNull ILevelWrapper wrapper)
 	{
@@ -83,25 +110,20 @@ public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 		{
 			return null;
 		}
-		
-		return this.levels.computeIfAbsent((IClientLevelWrapper) wrapper,
-			(clientLevelWrapper) ->
+		IClientLevelWrapper clientLevelWrapper = (IClientLevelWrapper) wrapper;
+		clientLevelWrapper.markAccessed();
+		DhClientLevel storedLevel = this.levels.computeIfAbsent(wrapper.getDhIdentifier(),
+			(key) -> createClientLevel(clientLevelWrapper)
+		);
+		if (storedLevel != null && storedLevel.getClientLevelWrapper() != wrapper) {
+			unloadLevel(storedLevel.getLevelWrapper());
+			storedLevel = createClientLevel(clientLevelWrapper);
+			if (storedLevel != null)
 			{
-				try
-				{
-					return new DhClientLevel(this.saveStructure, clientLevelWrapper, this.networkState);
-				}
-				catch (Exception e)
-				{
-					LOGGER.fatal("Failed to load client level, error: ["+e.getMessage()+"].", e);
-					
-					ClientApi.INSTANCE.showChatMessageNextFrame(
-						MinecraftTextFormat.RED + "Distant Horizons: Client level loading failed." + MinecraftTextFormat.CLEAR_FORMATTING + "\n" +
-						"Unable to load level ["+clientLevelWrapper.getDhIdentifier()+"], LODs may not appear. See log for more information.");
-					
-					return null;
-				}
-			});
+				this.levels.put(wrapper.getDhIdentifier(), storedLevel);
+			}
+		}
+		return storedLevel;
 	}
 	
 	@Override
@@ -112,7 +134,7 @@ public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 			return null;
 		}
 		
-		return this.levels.get(wrapper);
+		return this.levels.get(wrapper.getDhIdentifier());
 	}
 	
 	@Override
@@ -121,19 +143,26 @@ public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 	public int getLoadedLevelCount() { return this.levels.size(); }
 	
 	@Override
-	public void unloadLevel(@NotNull ILevelWrapper wrapper)
+	public boolean unloadLevel(@NotNull ILevelWrapper wrapper)
 	{
 		if (!(wrapper instanceof IClientLevelWrapper))
 		{
-			return;
+			return false;
 		}
 		
-		if (this.levels.containsKey(wrapper))
+		if (this.levels.containsKey(wrapper.getDhIdentifier()))
 		{
-			LOGGER.info("Unloading level " + this.levels.get(wrapper));
+			LOGGER.info("Unloading level " + this.levels.get(wrapper.getDhIdentifier()));
 			wrapper.onUnload();
-			this.levels.remove(wrapper).close();
+			Set<IClientLevelWrapper> wrappers = this.levelWrappers.get(wrapper.getDhIdentifier());
+			wrappers.remove(wrapper);
+			if (wrappers.isEmpty()) {
+				this.levels.remove(wrapper.getDhIdentifier()).close();
+			}
+			ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(wrapper));
+			return true;
 		}
+		return false;
 	}
 	
 	@Override
@@ -156,6 +185,7 @@ public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 			if (clientLevelWrapper != null)
 			{
 				clientLevelWrapper.onUnload();
+				ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(clientLevelWrapper));
 			}
 			
 			
@@ -178,6 +208,7 @@ public class DhClientWorld extends AbstractDhWorld implements IDhClientWorld
 		}
 		
 		this.levels.clear();
+		this.levelWrappers.clear();
 		this.clientTickTimer.cancel();
 		LOGGER.info("Closed DhWorld of type [" + this.environment + "].");
 	}

core/src/main/java/com/seibel/distanthorizons/core/world/DhServerWorld.java

@@ -19,12 +19,15 @@
 
 package com.seibel.distanthorizons.core.world;
 
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelLoadEvent;
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
 import com.seibel.distanthorizons.core.api.internal.ClientApi;
 import com.seibel.distanthorizons.core.enums.MinecraftTextFormat;
 import com.seibel.distanthorizons.core.generation.PregenManager;
 import com.seibel.distanthorizons.core.level.DhServerLevel;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.concurrent.CompletableFuture;
@@ -64,7 +67,9 @@ public class DhServerWorld extends AbstractDhServerWorld<DhServerLevel>
 			{
 				try
 				{
-					return new DhServerLevel(this.saveStructure, (IServerLevelWrapper) serverLevelWrapper, this.getServerPlayerStateManager());
+					DhServerLevel level = new DhServerLevel(this.saveStructure, (IServerLevelWrapper) serverLevelWrapper, this.getServerPlayerStateManager());
+					ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(wrapper));
+					return level;
 				}
 				catch (Exception e)
 				{
@@ -80,19 +85,21 @@ public class DhServerWorld extends AbstractDhServerWorld<DhServerLevel>
 	}
 	
 	@Override
-	public void unloadLevel(@NotNull ILevelWrapper wrapper)
+	public boolean unloadLevel(@NotNull ILevelWrapper wrapper)
 	{
 		if (!(wrapper instanceof IServerLevelWrapper))
 		{
-			return;
+			return false;
 		}
 		
 		if (this.dhLevelByLevelWrapper.containsKey(wrapper))
 		{
-			DhServerLevel level = this.dhLevelByLevelWrapper.get(wrapper);
 			wrapper.onUnload();
 			this.dhLevelByLevelWrapper.remove(wrapper).close();
+			ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelUnloadEvent.class, new DhApiLevelUnloadEvent.EventParam(wrapper));
+			return true;
 		}
+		return false;
 	}
 	
 	@Override

core/src/main/java/com/seibel/distanthorizons/core/world/IDhWorld.java

@@ -49,6 +49,6 @@ public interface IDhWorld extends Closeable
 	Iterable<? extends IDhLevel> getAllLoadedLevels();
 	int getLoadedLevelCount();
 	
-	void unloadLevel(@NotNull ILevelWrapper levelWrapper);
+	boolean unloadLevel(@NotNull ILevelWrapper levelWrapper);
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/wrapperInterfaces/minecraft/IMinecraftRenderWrapper.java

@@ -96,8 +96,6 @@ public interface IMinecraftRenderWrapper extends IBindable
 	@Nullable
 	ILightMapWrapper getLightmapWrapper(@NotNull ILevelWrapper level);
 	
-	float getShade(EDhDirection lodDirection);
-	
 	
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/wrapperInterfaces/minecraft/IMinecraftSharedWrapper.java

@@ -19,6 +19,7 @@
 
 package com.seibel.distanthorizons.core.wrapperInterfaces.minecraft;
 
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
 import com.seibel.distanthorizons.coreapi.interfaces.dependencyInjection.IBindable;
 
 import java.io.File;
@@ -31,6 +32,6 @@ public interface IMinecraftSharedWrapper extends IBindable
 	
 	int getPlayerCount();
 	
-	
+	IServerLevelWrapper getWrappedServerLevel(String levelKey);
 	
 }

core/src/main/java/com/seibel/distanthorizons/core/wrapperInterfaces/modAccessor/IImmersivePortalsAccessor.java

@@ -0,0 +1,47 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor;
+
+import com.seibel.distanthorizons.core.pos.DhChunkPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
+import com.seibel.distanthorizons.core.util.math.Vec3d;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
+import org.jetbrains.annotations.Nullable;
+
+public interface IImmersivePortalsAccessor extends IModAccessor
+{
+	
+	boolean isRenderingPortal();
+	
+	boolean wasPortalRecentlyVisible();
+	
+	@Nullable
+	DhBlockPos getOriginalPlayerBlockPos();
+	
+	@Nullable
+	DhChunkPos getOriginalPlayerChunkPos();
+	
+	@Nullable
+	IClientLevelWrapper getOriginalClientLevelWrapper();
+	
+	@Nullable
+	Vec3d getOriginalCameraPos();
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/wrapperInterfaces/modAccessor/ImmersivePortalsAbstractAccessor.java

@@ -0,0 +1,369 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.wrapperInterfaces.modAccessor;
+
+import com.seibel.distanthorizons.api.DhApi;
+import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiBeforeRenderEvent;
+import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiCancelableEventParam;
+import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
+import com.seibel.distanthorizons.core.logging.DhLogger;
+import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.List;
+import java.util.function.Supplier;
+
+public abstract class ImmersivePortalsAbstractAccessor implements IImmersivePortalsAccessor
+{
+	private static final DhLogger LOGGER = new DhLoggerBuilder().build();
+	
+	private static Class<?> portalClass;
+	private static MethodHandle isRenderingMethodHandle;
+	private static Method shouldSkipRenderingPortalMethod;
+	private static MethodHandle getGlobalPortalsMethodHandle;
+	
+	private static long lastPortalMsTime = -1;
+	private static boolean portalVisible = false;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	//region
+	
+	public ImmersivePortalsAbstractAccessor() 
+	{
+		LOGGER.info("Immersive Portals detected: some DH features will be disabled or may only partially function.");
+		
+		BeforeRenderEvent event = new BeforeRenderEvent(this);
+		DhApi.events.bind(DhApiBeforeRenderEvent.class, event); 
+	}
+	
+	//endregion
+	
+	
+	//=====================//
+	// reflection handling //
+	//=====================//
+	//region
+	
+	private static Class<?> getPortalRenderingClass()
+	{
+		try
+		{
+			return Class.forName("qouteall.imm_ptl.core.render.context_management.PortalRendering");
+		}
+		catch (ClassNotFoundException first)
+		{
+			try
+			{
+				return Class.forName("com.qouteall.immersive_portals.render.context_management.PortalRendering"); // 1.16
+			}
+			catch (ClassNotFoundException second)
+			{
+				RuntimeException err = new RuntimeException(first);
+				err.addSuppressed(second);
+				throw err;
+			}
+		}
+	}
+	
+	private static Class<?> getPortalRendererClass()
+	{
+		try
+		{
+			return Class.forName("qouteall.imm_ptl.core.render.renderer.PortalRenderer"); // 1.21+
+		}
+		catch (ClassNotFoundException first)
+		{
+			try
+			{
+				return Class.forName("qouteall.imm_ptl.core.render.PortalRenderer");
+			}
+			catch (ClassNotFoundException second)
+			{
+				try
+				{
+					return Class.forName("com.qouteall.immersive_portals.render.PortalRenderer"); // 1.16
+				}
+				catch (ClassNotFoundException third)
+				{
+					RuntimeException err = new RuntimeException(first);
+					err.addSuppressed(second);
+					err.addSuppressed(third);
+					throw err;
+				}
+			}
+		}
+	}
+	
+	private static Class<?> getPortalClass()
+	{
+		try
+		{
+			portalClass = Class.forName("qouteall.imm_ptl.core.portal.Portal");
+		}
+		catch (ClassNotFoundException first)
+		{
+			try
+			{
+				portalClass = Class.forName("com.qouteall.immersive_portals.portal.Portal"); // 1.16
+			}
+			catch (ClassNotFoundException second)
+			{
+				RuntimeException err = new RuntimeException(first);
+				err.addSuppressed(second);
+				throw err;
+			}
+		}
+		return portalClass;
+	}
+	
+	private static Class<?> getGlobalPortalStorageClass()
+	{
+		try
+		{
+			return Class.forName("qouteall.imm_ptl.core.portal.global_portals.GlobalPortalStorage");
+		}
+		catch (ClassNotFoundException first)
+		{
+			try
+			{
+				return Class.forName("com.qouteall.immersive_portals.McHelper"); // 1.16
+			}
+			catch (ClassNotFoundException second)
+			{
+				RuntimeException err = new RuntimeException(first);
+				err.addSuppressed(second);
+				throw err;
+			}
+		}
+	}
+	
+	private static Class<?> getIPCGlobalClass()
+	{
+		try
+		{
+			return Class.forName("qouteall.imm_ptl.core.IPCGlobal");
+		}
+		catch (ClassNotFoundException first)
+		{
+			try
+			{
+				return Class.forName("com.qouteall.immersive_portals.CGlobal"); // 1.16
+			}
+			catch (ClassNotFoundException second)
+			{
+				RuntimeException err = new RuntimeException(first);
+				err.addSuppressed(second);
+				throw err;
+			}
+		}
+	}
+	
+	private static boolean shouldSkipRenderingPortal(Object portal, Supplier<?> frustumSupplier)
+	{
+		try
+		{
+			if (shouldSkipRenderingPortalMethod == null)
+			{
+				shouldSkipRenderingPortalMethod = getPortalRendererClass().getDeclaredMethod(
+					"shouldSkipRenderingPortal", getPortalClass(), Supplier.class
+				);
+				shouldSkipRenderingPortalMethod.setAccessible(true);
+			}
+			if (Modifier.isStatic(shouldSkipRenderingPortalMethod.getModifiers()))
+			{
+				return (boolean) shouldSkipRenderingPortalMethod.invoke(null, portal, frustumSupplier);
+			}
+			else
+			{
+				return (boolean) shouldSkipRenderingPortalMethod.invoke(
+					getIPCGlobalClass().getField("renderer").get(null), portal, frustumSupplier
+				);
+			}
+		}
+		catch (Throwable e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+	
+	protected abstract Object getClientLevel();
+	
+	protected abstract Class<?> getLevelClass();
+	
+	protected abstract Iterable<?> getEntitiesForRendering();
+	
+	protected abstract Supplier<?> getFrustumSupplier();
+	
+	private List<?> getGlobalPortals(Object level)
+	{
+		try
+		{
+			if (getGlobalPortalsMethodHandle == null)
+			{
+				getGlobalPortalsMethodHandle = MethodHandles.lookup().findStatic(
+					getGlobalPortalStorageClass(),
+					"getGlobalPortals", MethodType.methodType(List.class).appendParameterTypes(
+						getLevelClass()
+					)
+				);
+			}
+			
+			return (List<?>) getGlobalPortalsMethodHandle.invoke(level);
+		}
+		catch (Throwable e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+	
+	//endregion
+	
+	
+	
+	//===========//
+	// overrides //
+	//===========//
+	//region
+	
+	@Override
+	public boolean isRenderingPortal()
+	{
+		try
+		{
+			if (isRenderingMethodHandle == null)
+			{
+				isRenderingMethodHandle = MethodHandles.lookup().findStatic(
+					getPortalRenderingClass(),
+					"isRendering", MethodType.methodType(Boolean.TYPE)
+				);
+			}
+			
+			return (boolean) isRenderingMethodHandle.invoke();
+		}
+		catch (Throwable e)
+		{
+			throw new RuntimeException(e);
+		}
+	}
+	
+	@Override
+	public boolean wasPortalRecentlyVisible()
+	{
+		// I did consider setting portalVisible to true whenever PortalRendering::isRendering was true instead,
+		// but that would still render fading immediately after startup before entering the portal at least once.
+		// This is more robust, but slightly worse for performance. Still, people can just turn fading off if they have issues.
+		boolean isPortalVisible = isPortalVisibleRightNow();
+		if (isPortalVisible)
+		{
+			lastPortalMsTime = System.currentTimeMillis();
+			portalVisible = true;
+		}
+		else if (portalVisible)
+		{
+			if (System.currentTimeMillis() - lastPortalMsTime > 1000)
+			{
+				portalVisible = false;
+			}
+		}
+		
+		// Simply checking portal visibility right now is not sufficient, that will still render the fading on top of the portal.
+		// Instead, we check if a portal was rendered during the last second or so.
+		return portalVisible;
+	}
+	
+	/** Essentially reimplements PortalRenderer::getPortalsToRender because it did not exist in 1.16. */
+	private boolean isPortalVisibleRightNow()
+	{
+		Supplier<?> frustumSupplier = getFrustumSupplier();
+		if (frustumSupplier == null)
+		{
+			return false;
+		}
+		
+		for (Object portal : getGlobalPortals(getClientLevel()))
+		{
+			if (!shouldSkipRenderingPortal(portal, frustumSupplier))
+			{
+				return true;
+			}
+		}
+		
+		for (Object entity : getEntitiesForRendering())
+		{
+			if (isPortalObject(entity)
+				&& !shouldSkipRenderingPortal(entity, frustumSupplier))
+			{
+				return true;
+			}
+		}
+		
+		return false;
+	}
+	private static boolean isPortalObject(Object object) { return getPortalClass().isInstance(object); }
+	
+	
+	//endregion
+	
+	@Override
+	public String getModName() { return "Immersive Portals"; }
+	
+	
+	
+	//=======//
+	// event //
+	//=======//
+	//region
+	
+	private static class BeforeRenderEvent extends DhApiBeforeRenderEvent
+	{
+		@NotNull
+		private final IImmersivePortalsAccessor immersivePortals;
+		
+		
+		public BeforeRenderEvent(@NotNull IImmersivePortalsAccessor portalAccessor) { this.immersivePortals = portalAccessor; }
+		
+		
+		@Override
+		public void beforeRender(DhApiCancelableEventParam<DhApiRenderParam> event)
+		{
+			// needed because otherwise DH doesn't render to the level anyway
+			// and will probably render the level the player is currently in instead
+			if (this.immersivePortals.isRenderingPortal())
+			{
+				event.cancelEvent();
+			}
+		}
+		
+	}
+	
+	//endregion
+	
+	
+	
+}

core/src/main/java/com/seibel/distanthorizons/core/wrapperInterfaces/render/renderPass/IDhGenericRenderer.java

@@ -23,10 +23,14 @@ import com.seibel.distanthorizons.api.interfaces.render.IDhApiCustomRenderRegist
 import com.seibel.distanthorizons.core.render.RenderParams;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 
-public interface IDhGenericRenderer extends IDhApiCustomRenderRegister
+public interface IDhGenericRenderer extends IDhApiCustomRenderRegister, AutoCloseable
 {
 	void render(RenderParams renderEventParam, IProfilerWrapper profiler, boolean renderingWithSsao);
 	
 	String getVboRenderDebugMenuString();
 	
+	@Override void close(); // override to remove "throws exception"
+	
+	
+	
 }

core/src/main/java/com/seibel/distanthorizons/core/wrapperInterfaces/world/IClientLevelWrapper.java

@@ -20,6 +20,7 @@
 package com.seibel.distanthorizons.core.wrapperInterfaces.world;
 
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.enums.EDhDirection;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import org.jetbrains.annotations.Nullable;
@@ -29,6 +30,9 @@ import java.awt.*;
 public interface IClientLevelWrapper extends ILevelWrapper
 {
 	
+	/** used to track when this level was last used for Immersive portals support */
+	void markAccessed();
+	
 	@Nullable
 	IServerLevelWrapper tryGetServerSideWrapper();
 	
@@ -39,4 +43,6 @@ public interface IClientLevelWrapper extends ILevelWrapper
 	
 	Color getCloudColor(float tickDelta);
 	
+	float getShade(EDhDirection lodDirection);
+	
 }

core/src/main/resources/assets/distanthorizons/lang/en_us.json

@@ -28,7 +28,10 @@
     "API LOCK",
   "distanthorizons.general.disabledByApi.@tooltip":
     "This option is controlled by another mod via DH's API \nso it cannot be changed via the UI or config file.",
-
+  "distanthorizons.general.unsupportedMcVersion":
+    "VER LOCK",
+  "distanthorizons.general.unsupportedMcVersion.@tooltip":
+    "DH doesn't support changing this option on this version of Minecraft. \nAny config file or API set values will be ignored.",
 
 
 
@@ -188,11 +191,11 @@
     "If true non terrain objects will be rendered in DH's terrain. \nThis includes beacon beams and clouds.",
   "distanthorizons.config.client.advanced.graphics.genericRendering.enableBeaconRendering":
     "Enable Beacon Rendering",
-  "distanthorizons.config.client.advanced.graphics.genericRendering.beaconRenderHeight": 
+  "distanthorizons.config.client.advanced.graphics.genericRendering.beaconRenderHeight":
     "Beacon render height",
   "distanthorizons.config.client.advanced.graphics.genericRendering.beaconRenderHeight.@tooltip":
     "Sets the maximum height at which beacons will render. \nThis will only affect new beacons coming into LOD render distance. \nBeacons currently visible in LOD chunks will not be affected.",
-  "distanthorizons.config.client.advanced.graphics.genericRendering.expandDistantBeacons": 
+  "distanthorizons.config.client.advanced.graphics.genericRendering.expandDistantBeacons":
     "Expand Distant Beacons",
   "distanthorizons.config.client.advanced.graphics.genericRendering.expandDistantBeacons.@tooltip":
     "If true LOD beacon beams will be rendered wider at extreme distances, \nmaking them easier to see. \nIf false all LOD beacon beams will only ever be 1 block wide.",
@@ -533,6 +536,26 @@
 
 
 
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging":
+    "Position Finder",
+
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderEnable":
+    "Enable Position Finder",
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderDetailLevel":
+    "Absolute Detail Level",
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderXPos":
+    "Pos X",
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderZPos":
+    "Pos Z",
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderMinBlockY":
+    "Min Block Y",
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderMaxBlockY":
+    "Max Block Y",
+  "distanthorizons.config.client.advanced.debugging.positionFinderDebugging.positionFinderMarginPercent":
+    "Margin %",
+    
+
+
   "distanthorizons.config.client.advanced.debugging.f3Screen":
     "F3 Screen",
 

core/src/test/java/tests/PooledDataSourceCheckoutTest.java

@@ -39,7 +39,13 @@ import org.junit.Test;
 public class PooledDataSourceCheckoutTest
 {
 	
-	@Test
+	/**
+	 * commented out for now since it has
+	 * a chance of breaking if any other tests
+	 * using the same pools run at the same time
+	 * or before this one.
+	 */
+	//@Test
 	public void TestCheckouts()
 	{
 		// something like this should probably be called before starting the test to ensure

core/src/test/java/tests/QuadTreeTest.java

@@ -57,7 +57,7 @@ public class QuadTreeTest
 	public void BasicPositiveQuadTreeTest()
 	{
 		AbstractTestTreeParams treeParams = new LargeTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
 		Assert.assertTrue("Tree min/max detail level out of expected bounds: " + tree, tree.treeRootDetailLevel >= 10 && tree.treeLeafDetailLevel <= 10 - 4);
 		
 		
@@ -93,7 +93,7 @@ public class QuadTreeTest
 	public void BasicNegativeQuadTreeTest()
 	{
 		AbstractTestTreeParams treeParams = new LargeTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), DhBlockPos2D.ZERO, LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), DhBlockPos2D.ZERO, LodUtil.BLOCK_DETAIL_LEVEL);
 		
 		
 		// root node //
@@ -128,7 +128,7 @@ public class QuadTreeTest
 	public void OutOfBoundsQuadTreeTest()
 	{
 		AbstractTestTreeParams treeParams = new LargeTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), new DhBlockPos2D(0, 0), LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), new DhBlockPos2D(0, 0), LodUtil.BLOCK_DETAIL_LEVEL);
 		Assert.assertEquals("tree diameter incorrect", treeParams.getWidthInBlocks(), tree.diameterInBlocks());
 		
 		
@@ -170,7 +170,7 @@ public class QuadTreeTest
 	public void outOfBoundsInTreeTest()
 	{
 		// very specific tree parameters to match test results
-		QuadTree<Integer> tree = new QuadTree<>(512, new DhBlockPos2D(125, -516), (byte) 6);
+		QuadTree<Integer> tree = new QuadTree<>(512, 8, new DhBlockPos2D(125, -516), (byte) 6);
 		Assert.assertEquals("Test may need to be re-calculated for different max detail level.", 9, tree.treeRootDetailLevel);
 		
 		
@@ -192,7 +192,7 @@ public class QuadTreeTest
 	public void QuadTreeRootAlignedMovingTest()
 	{
 		AbstractTestTreeParams treeParams = new LargeTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
 		
 		int pseudoRootNodeWidthInBlocks = BitShiftUtil.powerOfTwo(10);
 		
@@ -210,7 +210,7 @@ public class QuadTreeTest
 		testSet(tree, ne, 3);
 		testSet(tree, sw, 4);
 		testSet(tree, se, 5);
-		Assert.assertEquals("incorrect leaf node count", tree.leafNodeCount(), 4);
+		Assert.assertEquals("incorrect leaf node count", 4, tree.leafNodeCount());
 		
 		
 		// fake move //
@@ -237,7 +237,7 @@ public class QuadTreeTest
 		testGet(tree, ne, 3);
 		testGet(tree, sw, 4);
 		testGet(tree, se, 5);
-		Assert.assertEquals("incorrect leaf node count", tree.leafNodeCount(), 4);
+		Assert.assertEquals("incorrect leaf node count", 4,  tree.leafNodeCount());
 		
 		
 		
@@ -252,7 +252,7 @@ public class QuadTreeTest
 		testGet(tree, sw, null, IndexOutOfBoundsException.class);
 		testGet(tree, se, null, IndexOutOfBoundsException.class);
 		
-		Assert.assertEquals("incorrect leaf node count", tree.leafNodeCount(), 0);
+		Assert.assertEquals("incorrect leaf node count", 0, tree.leafNodeCount());
 		
 		
 		
@@ -276,7 +276,7 @@ public class QuadTreeTest
 		DhBlockPos2D edgeMoveBlockPos = new DhBlockPos2D(pseudoRootNodeWidthInBlocks - (treeParams.getWidthInRootNodes() * pseudoRootNodeWidthInBlocks), 0);
 		tree.setCenterBlockPos(edgeMoveBlockPos);
 		Assert.assertEquals("Tree center incorrect", edgeMoveBlockPos, tree.getCenterBlockPos());
-		Assert.assertEquals("incorrect leaf node count", 2, tree.leafNodeCount());
+		Assert.assertEquals("incorrect leaf node count", 0, tree.leafNodeCount());
 		
 	}
 	
@@ -284,7 +284,7 @@ public class QuadTreeTest
 	public void QuadTreeIterationTest()
 	{
 		AbstractTestTreeParams treeParams = new LargeTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
 		
 		
 		// (pseudo) root nodes //
@@ -336,7 +336,7 @@ public class QuadTreeTest
 	public void QuadTreeIterationFilterTest()
 	{
 		AbstractTestTreeParams treeParams = new TinyTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), (byte)0);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), (byte)0);
 		
 		
 		
@@ -418,7 +418,10 @@ public class QuadTreeTest
 		
 		
 	}
-	private static <T> void assertFilterCount(QuadTree<T> tree, String message, int expectedNodeCount, @Nullable QuadTree.INodeIteratorStoppingFunc<T> stoppingFilterFunc)
+	private static <T> void assertFilterCount(
+		QuadTree<T> tree, String message, 
+		int expectedNodeCount, 
+		@Nullable QuadTree.INodeIteratorStoppingFunc<T> stoppingFilterFunc)
 	{
 		ArrayList<String> foundNodePositionStrings = new ArrayList<>();
 		
@@ -532,7 +535,7 @@ public class QuadTreeTest
 	public void CenteredGridListIterationTest()
 	{
 		AbstractTestTreeParams treeParams = new TinyTestTree();
-		final QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
+		final QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
 		testSet(tree, DhSectionPos.encode(tree.treeRootDetailLevel, 0, 0), 0);
 		
 		// confirm the root node were added
@@ -573,18 +576,18 @@ public class QuadTreeTest
 		AbstractTestTreeParams treeParams = new TinyTestTree();
 		
 		// exactly inside (5*0,0)
-		testGridListRootCount(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), 1);
+		testGridListRootCount(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), 1);
 		
 		// offset across (5*-1,0) and (5*0,0)
-		testGridListRootCount(treeParams.getWidthInBlocks(), new DhBlockPos2D(-treeParams.getWidthInBlocks() / 4, treeParams.getPositiveEdgeCenterPos().z), 2);
+		testGridListRootCount(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), new DhBlockPos2D(-treeParams.getWidthInBlocks() / 4, treeParams.getPositiveEdgeCenterPos().z), 2);
 		
 		// offset across the origin: (5*0,0), (5*-1,0), (5*0,-1), and (5*-1,-1)
-		testGridListRootCount(treeParams.getWidthInBlocks(), DhBlockPos2D.ZERO, 4);
+		testGridListRootCount(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), DhBlockPos2D.ZERO, 4);
 		
 	}
-	private static void testGridListRootCount(int treeWidth, DhBlockPos2D treeMovePos, int expectedRootNodeCount)
+	private static void testGridListRootCount(int treeWidth, int treeDistanceForNodeClearing, DhBlockPos2D treeMovePos, int expectedRootNodeCount)
 	{
-		final QuadTree<Integer> tree = new QuadTree<>(treeWidth, DhBlockPos2D.ZERO, LodUtil.BLOCK_DETAIL_LEVEL);
+		final QuadTree<Integer> tree = new QuadTree<>(treeWidth, treeDistanceForNodeClearing, DhBlockPos2D.ZERO, LodUtil.BLOCK_DETAIL_LEVEL);
 		Assert.assertEquals("tree creation failed, incorrect initial position", DhBlockPos2D.ZERO, tree.getCenterBlockPos());
 		
 		tree.setCenterBlockPos(treeMovePos);
@@ -615,7 +618,7 @@ public class QuadTreeTest
 	public void TinyGridAlignedTreeTest()
 	{
 		AbstractTestTreeParams treeParams = new MediumTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), treeParams.getPositiveEdgeCenterPos(), LodUtil.BLOCK_DETAIL_LEVEL);
 		// minimum size tree should be 3 root nodes wide
 		Assert.assertEquals("incorrect tree node width", 3, tree.ringListWidth());
 		Assert.assertEquals("incorrect tree width", treeParams.getWidthInBlocks(), tree.diameterInBlocks());
@@ -644,7 +647,7 @@ public class QuadTreeTest
 	public void TinyGridOffsetTreeTest()
 	{
 		AbstractTestTreeParams treeParams = new MediumTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), new DhBlockPos2D(0, 0), LodUtil.BLOCK_DETAIL_LEVEL);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), new DhBlockPos2D(0, 0), LodUtil.BLOCK_DETAIL_LEVEL);
 		// minimum size tree should be 3 root nodes wide
 		Assert.assertEquals("incorrect tree node width", 3, tree.ringListWidth());
 		Assert.assertEquals("incorrect tree width", treeParams.getWidthInBlocks(), tree.diameterInBlocks());
@@ -683,7 +686,7 @@ public class QuadTreeTest
 	public void TreeDetailLevelLimitTest()
 	{
 		AbstractTestTreeParams treeParams = new MediumTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), new DhBlockPos2D(0, 0), (byte) 8);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), new DhBlockPos2D(0, 0), (byte) 8);
 		Assert.assertEquals("Test detail level's need to be adjusted. This isn't necessarily a failed test.", 10, tree.treeRootDetailLevel);
 		
 		// valid detail levels
@@ -705,7 +708,7 @@ public class QuadTreeTest
 	public void QuadNodeDetailLimitTest()
 	{
 		AbstractTestTreeParams treeParams = new MediumTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), new DhBlockPos2D(0, 0), (byte) 6);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), new DhBlockPos2D(0, 0), (byte) 6);
 		Assert.assertEquals("Test detail level's need to be adjusted. This isn't necessarily a failed test.", 10, tree.treeRootDetailLevel);
 		
 		// create the root node
@@ -817,8 +820,7 @@ public class QuadTreeTest
 	@Test
 	public void quadNodeChildPositionOutOfBoundsTest()
 	{
-		int treeWidthInBlocks = 64;
-		QuadTree<Integer> tree = new QuadTree<>(treeWidthInBlocks, new DhBlockPos2D(-2, 0), (byte) 0);
+		QuadTree<Integer> tree = new QuadTree<>(64, 1, new DhBlockPos2D(-2, 0), (byte) 0);
 		
 		
 		
@@ -865,7 +867,7 @@ public class QuadTreeTest
 	public void toStringTest()
 	{
 		AbstractTestTreeParams treeParams = new MediumTestTree();
-		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), new DhBlockPos2D(0, 0), (byte) 6);
+		QuadTree<Integer> tree = new QuadTree<>(treeParams.getWidthInBlocks(), treeParams.getBlockDistanceForNodeClearing(), new DhBlockPos2D(0, 0), (byte) 6);
 		
 		String treeString = tree.toString();
 		Assert.assertNotNull(treeString);
@@ -929,25 +931,28 @@ public class QuadTreeTest
 	private abstract static class AbstractTestTreeParams
 	{
 		public abstract int getWidthInBlocks();
+		public abstract int getBlockDistanceForNodeClearing();
 		
 		/** the tree should be slightly larger than the width in blocks to account for offset centers */
 		public int getWidthInRootNodes() { return MathUtil.log2(this.getWidthInBlocks()) + 2; }
 		/** the top (root) detail level in the tree */
-		public byte getMinDetailLevel() { return (byte) MathUtil.log2(this.getWidthInBlocks()); }
+		public byte getRootDetailLevel() { return (byte) MathUtil.log2(this.getWidthInBlocks()); }
 		/** @return the block pos so that the tree's negative corner lines up with (0,0) */
-		public DhBlockPos2D getPositiveEdgeCenterPos() { return new DhBlockPos2D(BitShiftUtil.powerOfTwo(this.getMinDetailLevel()) / 2, BitShiftUtil.powerOfTwo(this.getMinDetailLevel()) / 2); }
+		public DhBlockPos2D getPositiveEdgeCenterPos() { return new DhBlockPos2D(BitShiftUtil.powerOfTwo(this.getRootDetailLevel()) / 2, BitShiftUtil.powerOfTwo(this.getRootDetailLevel()) / 2); }
 		
 	}
 	
 	private static class LargeTestTree extends AbstractTestTreeParams
 	{
 		public int getWidthInBlocks() { return 8192; }
+		public int getBlockDistanceForNodeClearing() { return 16; }
 		
 	}
 	
 	private static class MediumTestTree extends AbstractTestTreeParams
 	{
 		public int getWidthInBlocks() { return 1024; }
+		public int getBlockDistanceForNodeClearing() { return 4; }
 		
 	}
 	
@@ -955,6 +960,7 @@ public class QuadTreeTest
 	{
 		// top detail level = 6
 		public int getWidthInBlocks() { return 32; }
+		public int getBlockDistanceForNodeClearing() { return 1; }
 		
 	}