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.
2010-02-02 23:18:17 +00:00
parent 5c8dd011e7
commit 89c48cdc27
16 changed files with 1445 additions and 24 deletions
--- a/library/PolyVoxCore/source/MeshEdge.cpp
+++ b/library/PolyVoxCore/source/MeshEdge.cpp
@ -0,0 +1,158 @@
+#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
+
+#include "MeshEdge.h"
+
+#include "Mesh.h"
+#include "MeshFace.h"
+#include "MeshVertex.h"
+#include "SurfaceVertex.h"
+
+#include <set>
+
+namespace PolyVox
+{
+
+	bool operator==(const MeshEdge& lhs, const MeshEdge& rhs)
+	{
+		return lhs.m_pSrc == rhs.m_pSrc && lhs.m_pDest == rhs.m_pDest;
+	}
+
+	bool operator<(const MeshEdge& lhs, const MeshEdge& rhs)
+	{
+		if(lhs == rhs)
+			return false;
+
+		if (lhs.m_pSrc < rhs.m_pSrc)
+			return true;
+		if (rhs.m_pSrc < lhs.m_pSrc)
+			return false;
+
+		if (lhs.m_pDest < rhs.m_pDest)
+			return true;
+		if (rhs.m_pDest < lhs.m_pDest)
+			return false;
+
+		return false;
+	}
+
+	MeshEdge::MeshEdge()
+	{
+		m_pOtherEdge = 0;
+		m_pNextEdge = 0;
+		m_pPreviousEdge = 0;
+
+		m_pSrc = 0;
+		m_pDest = 0;
+
+		m_pFace = 0;
+
+		m_fCost = 1000000.0f;
+	}
+
+	void MeshEdge::computeEdgeCost(Mesh* pParentMesh)
+	{
+		SurfaceVertex v0Data = m_pSrc->m_vertexData;
+		SurfaceVertex v1Data = m_pDest->m_vertexData;
+
+		m_fCost = 1000000.0f;
+
+		//For now, don't collapse vertices on material edges...
+		if(v0Data.isOnMaterialEdge() || v1Data.isOnMaterialEdge())
+		{
+			return;
+		}
+
+		//...or those on geometry (region) edges.
+		if(v0Data.isOnGeometryEdge() || v1Data.isOnGeometryEdge())
+		{
+			return;
+		}
+
+		//Check the normals are within the threshold.
+		if(v0Data.getNormal().dot(v1Data.getNormal()) < 0.999)
+		{
+			return;
+		}
+
+		//Test for face flips
+		for(std::set<MeshFace*>::iterator faceIter = pParentMesh->m_faces.begin(); faceIter != pParentMesh->m_faces.end(); faceIter++)
+		{
+			if((*faceIter)->collapseFlipsFace(this))
+			{
+				return;
+			}
+		}
+
+		m_fCost = 0.0f;
+		return;
+	}
+
+	bool MeshEdge::isSane(void)
+	{
+		if(m_pSrc == 0)
+		{
+			std::cout << "SANITY CHECK FAIL: Edge has no source vertex" << std::endl;
+			return false;
+		}
+
+		if(m_pDest == 0)
+		{
+			std::cout << "SANITY CHECK FAIL: Edge has no destination vertex" << std::endl;
+			return false;
+		}
+
+		if(m_pFace == 0)
+		{
+			std::cout << "SANITY CHECK FAIL: Edge has no face attached" << std::endl;
+			return false;
+		}
+
+		//Check loops
+		if(this !=  m_pNextEdge->m_pNextEdge->m_pNextEdge)
+		{
+			std::cout << "SANITY CHECK FAIL: Next edge loop is broken" << std::endl;
+			return false;
+		}
+
+		if(this !=  m_pPreviousEdge->m_pPreviousEdge->m_pPreviousEdge)
+		{
+			std::cout << "SANITY CHECK FAIL: Previous edge loop is broken" << std::endl;
+			return false;
+		}
+
+		//Make sure the other edge points back here
+		if(m_pOtherEdge != 0)
+		{
+			if(this !=  m_pOtherEdge->m_pOtherEdge)
+			{
+				std::cout << "SANITY CHECK FAIL: Other edge exists but does not point back here." << std::endl;
+				return false;
+			}
+		}
+
+		return true;
+	}
+}