diff --git a/include/SurfaceExtractors.h b/include/SurfaceExtractors.h
index ead8f2cc..f8debade 100644
--- a/include/SurfaceExtractors.h
+++ b/include/SurfaceExtractors.h
@@ -33,7 +33,7 @@ namespace PolyVox
 	void generateRoughMeshDataForRegion(BlockVolume<boost::uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch, IndexedSurfacePatch* multiMaterialPatch);
 	Vector3DFloat computeNormal(BlockVolume<boost::uint8_t>* volumeData, const Vector3DFloat& position, NormalGenerationMethod normalGenerationMethod);
 
-	void generateSmoothMeshDataForRegion(BlockVolume<boost::uint8_t>* volumeData, boost::uint16_t regionX, boost::uint16_t regionY, boost::uint16_t regionZ, IndexedSurfacePatch* singleMaterialPatch, IndexedSurfacePatch* multiMaterialPatch);
+	void generateSmoothMeshDataForRegion(BlockVolume<boost::uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch, IndexedSurfacePatch* multiMaterialPatch);
 	Vector3DFloat computeSmoothNormal(BlockVolume<boost::uint8_t>* volumeData, const Vector3DFloat& position, NormalGenerationMethod normalGenerationMethod);
 }
 
diff --git a/include/VolumeIterator.h b/include/VolumeIterator.h
index e7dbc3b5..8a74ca65 100644
--- a/include/VolumeIterator.h
+++ b/include/VolumeIterator.h
@@ -50,6 +50,7 @@ namespace PolyVox
 		VoxelType getVoxel(void) const;			
 
 		void setPosition(boost::uint16_t xPos, boost::uint16_t yPos, boost::uint16_t zPos);
+		void setValidRegion(const Region& region);
 		void setValidRegion(boost::uint16_t xFirst, boost::uint16_t yFirst, boost::uint16_t zFirst, boost::uint16_t xLast, boost::uint16_t yLast, boost::uint16_t zLast);
 		void setVoxel(VoxelType tValue);	
 
diff --git a/include/VolumeIterator.inl b/include/VolumeIterator.inl
index 956febb6..7f174c14 100644
--- a/include/VolumeIterator.inl
+++ b/include/VolumeIterator.inl
@@ -189,6 +189,12 @@ namespace PolyVox
 		mCurrentVoxel = currentBlock->m_tData + mVoxelIndexInBlock;
 	}
 
+	template <typename VoxelType>
+	void VolumeIterator<VoxelType>::setValidRegion(const Region& region)
+	{
+		setValidRegion(region.getLowerCorner().x(),region.getLowerCorner().y(),region.getLowerCorner().z(),region.getUpperCorner().x(),region.getUpperCorner().y(),region.getUpperCorner().z());
+	}
+
 	template <typename VoxelType>
 	void VolumeIterator<VoxelType>::setValidRegion(boost::uint16_t xFirst, boost::uint16_t yFirst, boost::uint16_t zFirst, boost::uint16_t xLast, boost::uint16_t yLast, boost::uint16_t zLast)
 	{
diff --git a/source/SurfaceExtractors.cpp b/source/SurfaceExtractors.cpp
index 22adcc72..b01d553c 100644
--- a/source/SurfaceExtractors.cpp
+++ b/source/SurfaceExtractors.cpp
@@ -19,27 +19,20 @@ namespace PolyVox
 		regVolume.setUpperCorner(regVolume.getUpperCorner() - Vector3DInt32(1,1,1));
 		region.cropTo(regVolume);
 
-		const uint16_t firstX = region.getLowerCorner().x();
-		const uint16_t firstY = region.getLowerCorner().y();
-		const uint16_t firstZ = region.getLowerCorner().z();
-		const uint16_t lastX = region.getUpperCorner().x();
-		const uint16_t lastY = region.getUpperCorner().y();
-		const uint16_t lastZ = region.getUpperCorner().z();
-
 		//Offset from lower block corner
-		const Vector3DFloat offset(firstX,firstY,firstZ);
+		const Vector3DFloat offset = static_cast<Vector3DFloat>(region.getLowerCorner());
 
 		Vector3DFloat vertlist[12];
 		uint8_t vertMaterials[12];
 		VolumeIterator<boost::uint8_t> volIter(*volumeData);
-		volIter.setValidRegion(firstX,firstY,firstZ,lastX,lastY,lastZ);
+		volIter.setValidRegion(region);
 
 		//////////////////////////////////////////////////////////////////////////
 		//Get mesh data
 		//////////////////////////////////////////////////////////////////////////
 
 		//Iterate over each cell in the region
-		for(volIter.setPosition(firstX,firstY,firstZ);volIter.isValidForRegion();volIter.moveForwardInRegion())
+		for(volIter.setPosition(region.getLowerCorner().x(),region.getLowerCorner().y(), region.getLowerCorner().z());volIter.isValidForRegion();volIter.moveForwardInRegion())
 		{		
 			//Current position
 			const uint16_t x = volIter.getPosX();
@@ -416,23 +409,21 @@ namespace PolyVox
 		return result;
 	}
 
-	void generateSmoothMeshDataForRegion(BlockVolume<uint8_t>* volumeData, uint16_t regionX, uint16_t regionY, uint16_t regionZ, IndexedSurfacePatch* singleMaterialPatch, IndexedSurfacePatch* multiMaterialPatch)
+	void generateSmoothMeshDataForRegion(BlockVolume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch, IndexedSurfacePatch* multiMaterialPatch)
 	{	
-		//First and last voxels in the region
-		const uint16_t firstX = regionX * POLYVOX_REGION_SIDE_LENGTH;
-		const uint16_t firstY = regionY * POLYVOX_REGION_SIDE_LENGTH;
-		const uint16_t firstZ = regionZ * POLYVOX_REGION_SIDE_LENGTH;
-		const uint16_t lastX = (std::min)(firstX + POLYVOX_REGION_SIDE_LENGTH-1,volumeData->getSideLength()-2);
-		const uint16_t lastY = (std::min)(firstY + POLYVOX_REGION_SIDE_LENGTH-1,volumeData->getSideLength()-2);
-		const uint16_t lastZ = (std::min)(firstZ + POLYVOX_REGION_SIDE_LENGTH-1,volumeData->getSideLength()-2);
+		//When generating the mesh for a region we actually look one voxel outside it in the
+		// back, bottom, right direction. Protect against access violations by cropping region here
+		Region regVolume = volumeData->getEnclosingRegion();
+		regVolume.setUpperCorner(regVolume.getUpperCorner() - Vector3DInt32(1,1,1));
+		region.cropTo(regVolume);
 
 		//Offset from lower block corner
-		const Vector3DFloat offset(firstX,firstY,firstZ);
+		const Vector3DFloat offset = static_cast<Vector3DFloat>(region.getLowerCorner());
 
 		Vector3DFloat vertlist[12];
 		uint8_t vertMaterials[12];
 		VolumeIterator<boost::uint8_t> volIter(*volumeData);
-		volIter.setValidRegion(firstX,firstY,firstZ,lastX,lastY,lastZ);
+		volIter.setValidRegion(region);
 
 		const float threshold = 0.5f;
 
@@ -441,7 +432,7 @@ namespace PolyVox
 		//////////////////////////////////////////////////////////////////////////
 
 		//Iterate over each cell in the region
-		for(volIter.setPosition(firstX,firstY,firstZ);volIter.isValidForRegion();volIter.moveForwardInRegion())
+		for(volIter.setPosition(region.getLowerCorner().x(),region.getLowerCorner().y(), region.getLowerCorner().z());volIter.isValidForRegion();volIter.moveForwardInRegion())
 		{		
 			//Current position
 			const uint16_t x = volIter.getPosX();