diff --git a/library/PolyVoxCore/include/MaterialDensityPair.h b/library/PolyVoxCore/include/MaterialDensityPair.h
index 1c4f0c73..4377c132 100644
--- a/library/PolyVoxCore/include/MaterialDensityPair.h
+++ b/library/PolyVoxCore/include/MaterialDensityPair.h
@@ -54,7 +54,7 @@ namespace PolyVox
 
 		static Type getMaxDensity() throw();
 		static Type getMinDensity() throw();
-		static Type getMidDensity() throw();
+		static Type getThreshold() throw();
 
 	private:
 		Type m_uMaterial : NoOfMaterialBits;
diff --git a/library/PolyVoxCore/include/MaterialDensityPair.inl b/library/PolyVoxCore/include/MaterialDensityPair.inl
index a63d6959..2533595d 100644
--- a/library/PolyVoxCore/include/MaterialDensityPair.inl
+++ b/library/PolyVoxCore/include/MaterialDensityPair.inl
@@ -107,7 +107,7 @@ namespace PolyVox
 	}
 
 	template <typename Type, uint8_t NoOfMaterialBits, uint8_t NoOfDensityBits>
-	Type  MaterialDensityPair<Type, NoOfMaterialBits, NoOfDensityBits>::getMidDensity() throw()
+	Type  MaterialDensityPair<Type, NoOfMaterialBits, NoOfDensityBits>::getThreshold() throw()
 	{
 		return  0x01 << (NoOfDensityBits - 1);
 	}
diff --git a/library/PolyVoxCore/include/SurfaceExtractor.inl b/library/PolyVoxCore/include/SurfaceExtractor.inl
index b8a3703e..538dfb22 100644
--- a/library/PolyVoxCore/include/SurfaceExtractor.inl
+++ b/library/PolyVoxCore/include/SurfaceExtractor.inl
@@ -259,7 +259,7 @@ namespace PolyVox
 
 					iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexY | iPreviousCubeIndexZ;
 
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 				else //previous X not available
 				{
@@ -277,8 +277,8 @@ namespace PolyVox
 
 					iCubeIndex = iPreviousCubeIndexY | iPreviousCubeIndexZ;
 
-					if (v011.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 64;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v011.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 64;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 			}
 			else //previous Y not available
@@ -299,8 +299,8 @@ namespace PolyVox
 
 					iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexZ;
 
-					if (v101.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 32;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v101.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 32;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 				else //previous X not available
 				{
@@ -313,10 +313,10 @@ namespace PolyVox
 					uint8_t iPreviousCubeIndexZ = pPreviousBitmask[uXRegSpace][uYRegSpace];
 					iCubeIndex = iPreviousCubeIndexZ >> 4;
 
-					if (v001.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 16;
-					if (v101.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 32;
-					if (v011.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 64;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v001.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 16;
+					if (v101.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 32;
+					if (v011.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 64;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 			}
 		}
@@ -341,8 +341,8 @@ namespace PolyVox
 
 					iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexY;
 
-					if (v110.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 8;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v110.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 8;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 				else //previous X not available
 				{
@@ -359,10 +359,10 @@ namespace PolyVox
 
 					iCubeIndex = iPreviousCubeIndexY;
 
-					if (v010.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 4;
-					if (v110.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 8;
-					if (v011.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 64;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v010.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 4;
+					if (v110.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 8;
+					if (v011.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 64;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 			}
 			else //previous Y not available
@@ -382,10 +382,10 @@ namespace PolyVox
 
 					iCubeIndex = iPreviousCubeIndexX;
 
-					if (v100.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 2;	
-					if (v110.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 8;
-					if (v101.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 32;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v100.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 2;	
+					if (v110.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 8;
+					if (v101.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 32;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 				else //previous X not available
 				{
@@ -399,14 +399,14 @@ namespace PolyVox
 					v011 = m_sampVolume.peekVoxel0px1py1pz();
 					v111 = m_sampVolume.peekVoxel1px1py1pz();
 
-					if (v000.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 1;
-					if (v100.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 2;
-					if (v010.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 4;
-					if (v110.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 8;
-					if (v001.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 16;
-					if (v101.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 32;
-					if (v011.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 64;
-					if (v111.getDensity() < VoxelType::getMidDensity()) iCubeIndex |= 128;
+					if (v000.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 1;
+					if (v100.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 2;
+					if (v010.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 4;
+					if (v110.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 8;
+					if (v001.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 16;
+					if (v101.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 32;
+					if (v011.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 64;
+					if (v111.getDensity() < VoxelType::getThreshold()) iCubeIndex |= 128;
 				}
 			}
 		}
@@ -472,7 +472,7 @@ namespace PolyVox
 					const Vector3DFloat n100 = computeCentralDifferenceGradient(m_sampVolume);
 
 					//float fInterp = static_cast<float>(v100.getDensity() - VoxelType::getMinDensity()) / static_cast<float>(VoxelType::getMaxDensity() - VoxelType::getMinDensity());
-					float fInterp = static_cast<float>(VoxelType::getMidDensity() - v000.getDensity()) / static_cast<float>(v100.getDensity() - v000.getDensity());
+					float fInterp = static_cast<float>(VoxelType::getThreshold() - v000.getDensity()) / static_cast<float>(v100.getDensity() - v000.getDensity());
 					//fInterp = 0.5f;
 
 					const Vector3DFloat v3dPosition(static_cast<float>(uXVolSpace - m_regInputCropped.getLowerCorner().getX()) + fInterp, static_cast<float>(uYVolSpace - m_regInputCropped.getLowerCorner().getY()), static_cast<float>(uZVolSpace - m_regInputCropped.getLowerCorner().getZ()));
@@ -500,7 +500,7 @@ namespace PolyVox
 					const VoxelType v010 = m_sampVolume.getVoxel();
 					const Vector3DFloat n010 = computeCentralDifferenceGradient(m_sampVolume);
 
-					float fInterp = static_cast<float>(VoxelType::getMidDensity() - v000.getDensity()) / static_cast<float>(v010.getDensity() - v000.getDensity());
+					float fInterp = static_cast<float>(VoxelType::getThreshold() - v000.getDensity()) / static_cast<float>(v010.getDensity() - v000.getDensity());
 					//fInterp = 0.5f;
 
 					const Vector3DFloat v3dPosition(static_cast<float>(uXVolSpace - m_regInputCropped.getLowerCorner().getX()), static_cast<float>(uYVolSpace - m_regInputCropped.getLowerCorner().getY()) + fInterp, static_cast<float>(uZVolSpace - m_regInputCropped.getLowerCorner().getZ()));
@@ -528,7 +528,7 @@ namespace PolyVox
 					const VoxelType v001 = m_sampVolume.getVoxel();
 					const Vector3DFloat n001 = computeCentralDifferenceGradient(m_sampVolume);
 
-					float fInterp = static_cast<float>(VoxelType::getMidDensity() - v000.getDensity()) / static_cast<float>(v001.getDensity() - v000.getDensity());
+					float fInterp = static_cast<float>(VoxelType::getThreshold() - v000.getDensity()) / static_cast<float>(v001.getDensity() - v000.getDensity());
 					//fInterp = 0.5f;
 
 					const Vector3DFloat v3dPosition(static_cast<float>(uXVolSpace - m_regInputCropped.getLowerCorner().getX()), static_cast<float>(uYVolSpace - m_regInputCropped.getLowerCorner().getY()), static_cast<float>(uZVolSpace - m_regInputCropped.getLowerCorner().getZ()) + fInterp);