Templatised SurfaceMesh class on vertex type.

Replaced 'SurfaceVertex' with PositionMaterial and PositionMaterialNormal classes.
Different surface extractors can now work with different vertex types.

library/PolyVoxCore/include/CubicSurfaceExtractorWithNormals.h

@@ -0,0 +1,58 @@
+/*******************************************************************************
+Copyright (c) 2005-2009 David Williams
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution. 	
+*******************************************************************************/
+
+#ifndef __PolyVox_CubicSurfaceExtractorWithNormals_H__
+#define __PolyVox_CubicSurfaceExtractorWithNormals_H__
+
+#include "PolyVoxForwardDeclarations.h"
+#include "VolumeSampler.h"
+
+#include "PolyVoxImpl/TypeDef.h"
+
+namespace PolyVox
+{
+	template <typename VoxelType>
+	class CubicSurfaceExtractorWithNormals
+	{
+	public:
+		CubicSurfaceExtractorWithNormals(Volume<VoxelType>* volData, Region region, SurfaceMesh<PositionMaterialNormal>* result);
+
+		void execute();
+
+	private:
+		//The volume data and a sampler to access it.
+		Volume<VoxelType>* m_volData;
+		VolumeSampler<VoxelType> m_sampVolume;
+
+		//The surface patch we are currently filling.
+		SurfaceMesh<PositionMaterialNormal>* m_meshCurrent;
+
+		//Information about the region we are currently processing
+		Region m_regSizeInVoxels;
+		Region m_regSizeInCells;
+	};
+}
+
+#include "CubicSurfaceExtractorWithNormals.inl"
+
+#endif