diff --git a/examples/OpenGL/CMakeLists.txt b/examples/OpenGL/CMakeLists.txt
index 2cc544c9..0f243852 100644
--- a/examples/OpenGL/CMakeLists.txt
+++ b/examples/OpenGL/CMakeLists.txt
@@ -16,7 +16,6 @@ SET(CMAKE_DEBUG_POSTFIX "_d")
 SOURCE_GROUP("Sources" FILES ${SRC_FILES})
 #SOURCE_GROUP("Headers" FILES ${INC_FILES})
 
-FIND_PACKAGE(Boost REQUIRED)
 FIND_PACKAGE(OpenGL REQUIRED)
 
 IF (WIN32)
diff --git a/library/include/PolyVoxCore/BlockVolume.h b/library/include/PolyVoxCore/BlockVolume.h
index 2229a20d..3d599920 100644
--- a/library/include/PolyVoxCore/BlockVolume.h
+++ b/library/include/PolyVoxCore/BlockVolume.h
@@ -54,6 +54,7 @@ namespace PolyVox
 		bool containsPoint(const Vector3DInt32& pos, uint16 boundary) const;
 		BlockVolumeIterator<VoxelType> firstVoxel(void);
 		void idle(uint32 uAmount);
+		bool isRegionHomogenous(const Region& region);
 		BlockVolumeIterator<VoxelType> lastVoxel(void);
 
 	private:
diff --git a/library/include/PolyVoxCore/BlockVolume.inl b/library/include/PolyVoxCore/BlockVolume.inl
index edc389aa..f075e5a1 100644
--- a/library/include/PolyVoxCore/BlockVolume.inl
+++ b/library/include/PolyVoxCore/BlockVolume.inl
@@ -21,6 +21,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 #pragma region Headers
 #include "Block.h"
+#include "BlockVolumeIterator.h"
 #include "Region.h"
 #include "Vector.h"
 
@@ -204,6 +205,28 @@ namespace PolyVox
 	{
 	}	
 
+	template <typename VoxelType>
+	bool BlockVolume<VoxelType>::isRegionHomogenous(const Region& region)
+	{
+		BlockVolumeIterator<VoxelType> iter(*this);
+		iter.setValidRegion(region);
+		iter.setPosition(static_cast<Vector3DInt16>(region.getLowerCorner()));
+
+		VoxelType tFirst = iter.getVoxel();
+		iter.moveForwardInRegionXYZ();
+
+		do
+		{
+			VoxelType tCurrent = iter.getVoxel();
+			if(tCurrent != tFirst)
+			{
+				return false;
+			}
+		}while(iter.moveForwardInRegionXYZ());
+
+		return true;
+	}
+
 	template <typename VoxelType>
 	BlockVolumeIterator<VoxelType> BlockVolume<VoxelType>::lastVoxel(void)
 	{
diff --git a/library/source/PolyVoxUtil/VolumeChangeTracker.cpp b/library/source/PolyVoxUtil/VolumeChangeTracker.cpp
index 587d6fed..a239330b 100644
--- a/library/source/PolyVoxUtil/VolumeChangeTracker.cpp
+++ b/library/source/PolyVoxUtil/VolumeChangeTracker.cpp
@@ -56,8 +56,8 @@ namespace PolyVox
 		volRegionUpToDate = new LinearVolume<bool>(PolyVox::logBase2(POLYVOX_VOLUME_SIDE_LENGTH_IN_REGIONS));
 	}
 
-	
 
+	//Return changed regions - cropped to volume
 	void VolumeChangeTracker::getChangedRegions(std::list<Region>& listToFill) const
 	{
 		//Clear the list
@@ -82,7 +82,10 @@ namespace PolyVox
 						const uint16 lastY = firstY + POLYVOX_REGION_SIDE_LENGTH;
 						const uint16 lastZ = firstZ + POLYVOX_REGION_SIDE_LENGTH;
 
-						listToFill.push_back(Region(Vector3DInt32(firstX, firstY, firstZ), Vector3DInt32(lastX, lastY, lastZ)));
+						Region region(Vector3DInt32(firstX, firstY, firstZ), Vector3DInt32(lastX, lastY, lastZ));
+						region.cropTo(volumeData->getEnclosingRegion());
+
+						listToFill.push_back(region);
 					}
 				}
 			}