Working version of mesh decimation code which acts directly on vertex/index buffers.

Also initial work on a 'dynamic' mesh for simplification... but this probably won't be needed now.

library/PolyVoxCore/include/Mesh.h

@@ -0,0 +1,61 @@
+#pragma region License
+/*******************************************************************************
+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. 	
+*******************************************************************************/
+#pragma endregion
+
+#ifndef __PolyVox_Mesh_H__
+#define __PolyVox_Mesh_H__
+
+#include "MeshEdge.h"
+#include "MeshFace.h"
+#include "MeshVertex.h"
+
+#include "PolyVoxImpl/TypeDef.h"
+
+#include <set>
+
+namespace PolyVox
+{
+	class POLYVOXCORE_API Mesh
+	{
+	public:
+
+		void buildFromISP(IndexedSurfacePatch* pIsp);
+		void fillISP(IndexedSurfacePatch* pIsp);
+		void matchEdgePairs(void);
+		void computeEdgeCosts(void);
+
+		void removeEdge(MeshEdge* pMeshEdge);
+
+		void decimateAll(void);
+		bool decimateOne(void);
+
+		bool isSane(void);
+
+		std::set<MeshEdge*> m_edges;
+		std::set<MeshFace*> m_faces;
+		std::set<MeshVertex*> m_vertices;
+	};
+}
+
+#endif