Finish adding simple frustum culling

src/main/java/com/seibel/lod/objects/RegionPos.java

@@ -62,15 +62,16 @@ public class RegionPos
 		z = Math.floorDiv(pos.z, LodUtil.REGION_WIDTH_IN_CHUNKS);
 	}
 	
-	
+	/** Returns the ChunkPos at the center of this region */
 	public ChunkPos chunkPos()
 	{
-		return new ChunkPos(x * LodUtil.REGION_WIDTH_IN_CHUNKS, z * LodUtil.REGION_WIDTH_IN_CHUNKS);
+		return new ChunkPos((x * LodUtil.REGION_WIDTH_IN_CHUNKS) + LodUtil.REGION_WIDTH_IN_CHUNKS/2, (z * LodUtil.REGION_WIDTH_IN_CHUNKS) + LodUtil.REGION_WIDTH_IN_CHUNKS/2);
 	}
 	
+	/** Returns the BlockPos at the center of this region */
 	public BlockPos blockPos()
 	{
-		return chunkPos().getWorldPosition();
+		return chunkPos().getWorldPosition().offset(LodUtil.CHUNK_WIDTH/2, 0, LodUtil.CHUNK_WIDTH/2);
 	}
 	
 	

src/main/java/com/seibel/lod/render/LodRenderer.java

@@ -319,21 +319,18 @@ public class LodRenderer
 
         if (vbos != null)
         {
-        	int rendered = 0;
-        	int skipped = 0;
-        	
-        	Vector3d cameraDir = mc.cameraEntity.getLookAngle();
+        	Vector3d cameraDir = mc.cameraEntity.getLookAngle().normalize();
         	
         	// used to determine what type of fog to render
         	int halfWidth = vbos.length/2;
         	int quarterWidth = vbos.length/4;
         	
-            for (int i = 0; i < vbos.length; i++)
+        	for (int i = 0; i < vbos.length; i++)
             {
                 for (int j = 0; j < vbos.length; j++)
                 {
                 	RegionPos vboPos = new RegionPos(i + lodDim.getCenterX() - lodDim.getWidth()/2, j + lodDim.getCenterZ() - lodDim.getWidth()/2);
-	            	if (RenderUtil.isRegionInViewFrustum(player.blockPosition(), cameraDir, vboPos.blockPos()))
+            		if (RenderUtil.isRegionInViewFrustum(mc.cameraEntity.blockPosition(), cameraDir, vboPos.blockPos()))
 	            	{
 	                	if ((i > halfWidth - quarterWidth && i < halfWidth + quarterWidth) && (j > halfWidth - quarterWidth && j < halfWidth + quarterWidth))
 	                		setupFog(fogSettings.near.distance, fogSettings.near.quality);
@@ -342,16 +339,9 @@ public class LodRenderer
 	                    
 	                	
 	            		sendLodsToGpuAndDraw(vbos[i][j], modelViewMatrix);
-	            		rendered++;
 	                }
-	            	else
-	            	{
-	            		skipped++;
-	            	}
                 }
             }
-            
-            ClientProxy.LOGGER.info(rendered + " - " + skipped);
         }
 
 
@@ -389,7 +379,6 @@ public class LodRenderer
     }
     
     
-    
 	/**
      * This is where the actual drawing happens.
      *

src/main/java/com/seibel/lod/render/RenderUtil.java

@@ -110,7 +110,7 @@ public class RenderUtil
 	
 	
 	/**
-	 * Returns true if one of the regions 4 corners is in front
+	 * Returns true if one of the region's 4 corners is in front
 	 * of the camera.
 	 */
 	public static boolean isRegionInViewFrustum(BlockPos playerBlockPos, Vector3d cameraDir, BlockPos vboCenterPos)
@@ -124,17 +124,17 @@ public class RenderUtil
 		
     	int halfRegionWidth = LodUtil.REGION_WIDTH / 2;
     	
-    	Vector3d vboSeVec = new Vector3d(vboCenterVec.x + halfRegionWidth, 0, vboCenterVec.z + halfRegionWidth).normalize();
-    	Vector3d vboSwVec = new Vector3d(vboCenterVec.x - halfRegionWidth, 0, vboCenterVec.z + halfRegionWidth).normalize();
-    	Vector3d vboNwVec = new Vector3d(vboCenterVec.x - halfRegionWidth, 0, vboCenterVec.z - halfRegionWidth).normalize();
-    	Vector3d vboNeVec = new Vector3d(vboCenterVec.x + halfRegionWidth, 0, vboCenterVec.z - halfRegionWidth).normalize();
+    	// calculate the 4 corners
+    	Vector3d vboSeVec = new Vector3d(vboCenterVec.x + halfRegionWidth, vboCenterVec.y, vboCenterVec.z + halfRegionWidth);//.normalize();
+    	Vector3d vboSwVec = new Vector3d(vboCenterVec.x - halfRegionWidth, vboCenterVec.y, vboCenterVec.z + halfRegionWidth);//.normalize();
+    	Vector3d vboNwVec = new Vector3d(vboCenterVec.x - halfRegionWidth, vboCenterVec.y, vboCenterVec.z - halfRegionWidth);//.normalize();
+    	Vector3d vboNeVec = new Vector3d(vboCenterVec.x + halfRegionWidth, vboCenterVec.y, vboCenterVec.z - halfRegionWidth);//.normalize();
     	
+    	// if any corner is visible, this region should be rendered
     	return isNormalizedVectorInViewFrustum(vboSeVec, cameraDir) ||
     			isNormalizedVectorInViewFrustum(vboSwVec, cameraDir) ||
     			isNormalizedVectorInViewFrustum(vboNwVec, cameraDir) ||
     			isNormalizedVectorInViewFrustum(vboNeVec, cameraDir);
-    	
-//    	return isNormalizedVectorInViewFrustum(vboCenterVec.normalize(), cameraDir);
 	}
     
 	/**
@@ -143,8 +143,9 @@ public class RenderUtil
 	 */
     private static boolean isNormalizedVectorInViewFrustum(Vector3d objectVector, Vector3d cameraDir)
 	{
-    	// take the dot product
-    	double dot = objectVector.dot(cameraDir);
-    	return dot > 0;
+    	// the -0.1 is to offer a slight buffer so we are
+    	// more likely to render LODs and thus, hopefully prevent
+    	// flickering or odd disappearences
+    	return objectVector.dot(cameraDir) > -0.1;
 	}
 }