Cull beacons based on X/Z distance instead of 3D distance

core/src/main/java/com/seibel/distanthorizons/core/render/renderer/generic/BeaconRenderHandler.java

@@ -307,9 +307,7 @@ public class BeaconRenderHandler
 					{
 						Thread.sleep(MAX_CULLING_FREQUENCY_IN_MS);
 					}
-					catch (InterruptedException ignore)
-					{
-					}
+					catch (InterruptedException ignore) { }
 					
 					try
 					{
@@ -331,7 +329,7 @@ public class BeaconRenderHandler
 						for (DhApiRenderableBox box : this.fullBeaconBoxList)
 						{
 							// if a beacon is outside the vanilla render distance render it
-							double distance = Vec3d.getDistance(cameraPos, box.minPos);
+							double distance = Vec3d.getHorizontalDistance(cameraPos, box.minPos);
 							if (distance > mcRenderDistance)
 							{
 								this.beaconBoxGroup.add(box);

core/src/main/java/com/seibel/distanthorizons/core/util/math/Vec3d.java

@@ -164,5 +164,11 @@ public class Vec3d extends DhApiVec3d
 				+ Math.pow(a.y - b.y, 2)
 				+ Math.pow(a.z - b.z, 2);
 	}
+	/** Gets the distance between points A and B, ignoring Y height. */
+	public static double getHorizontalDistance(DhApiVec3d a, DhApiVec3d b)
+	{
+		return Math.sqrt(Math.pow(a.x - b.x, 2)
+				+ Math.pow(a.z - b.z, 2));
+	}
 	
 }