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Work on mesh decimation.

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This commit is contained in:
David Williams 2007-08-18 11:18:33 +00:00
parent 90cf3d7c9a
commit 5d22ae6e8c
1 changed files with 50 additions and 55 deletions
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95
source/PolyVoxSceneManager.cpp
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@ -943,7 +943,9 @@ namespace Ogre
//Decimate mesh
//////////////////////////////////////////////////////////////////////////
mergeVertices6(vertexData, indexData);
//Ogre::LogManager::getSingleton().logMessage("Before merge: vertices = " + Ogre::StringConverter::toString(vertexData[4].size()) + ", triangles = " + Ogre::StringConverter::toString(indexData[4].size()/3));
//mergeVertices6(vertexData, indexData);
//Ogre::LogManager::getSingleton().logMessage("After merge: vertices = " + Ogre::StringConverter::toString(vertexData[4].size()) + ", triangles = " + Ogre::StringConverter::toString(indexData[4].size()/3));
}
void PolyVoxSceneManager::mergeVertices6(std::vector< std::vector<Vertex> >& vertexData, std::vector< std::vector<Triangle> >& indexData) const
@ -953,7 +955,7 @@ namespace Ogre
if(vertexData[material].empty())
continue;
Ogre::LogManager::getSingleton().logMessage("Material = " + Ogre::StringConverter::toString(material) + " No of vertices = " + Ogre::StringConverter::toString(vertexData[material].size()));
//Ogre::LogManager::getSingleton().logMessage("Material = " + Ogre::StringConverter::toString(material) + " No of vertices = " + Ogre::StringConverter::toString(vertexData[material].size()));
std::vector< std::set<uint> > connectedVertices;
connectedVertices.resize(vertexData[material].size());
@ -971,14 +973,11 @@ namespace Ogre
connectedVertices[vertexCt].erase(vertexCt);
}
std::vector< bool > vertexIsFixed;
vertexIsFixed.resize(vertexData[material].size());
std::vector< uint > initialConnections;
initialConnections.resize(vertexData[material].size());
for(uint vertexCt = 0; vertexCt < vertexData[material].size(); vertexCt++)
{
if(connectedVertices[vertexCt].size() < 6)
vertexIsFixed[vertexCt] = true;
else
vertexIsFixed[vertexCt] = false;
initialConnections[vertexCt] = connectedVertices[vertexCt].size();
}
/*std::vector<uint> noOfEdges; //0 means not on ege, 1 means edge, 2 or more means corner
@ -1003,74 +1002,70 @@ namespace Ogre
noOfEdges[vertexCt] |= 32;
}*/
for(uint u = 0; u < 16; u++)
for(uint u = 0; u < 50; u++)
{
//FIXME - this is innefficient! iterating over ever vertex, even though one material might just use a few of them.
for(uint vertexCt = 0; vertexCt < vertexData[material].size(); vertexCt++)
{
//if((initialConnections[vertexCt] == 6) || (initialConnections[vertexCt] == initialConnections[*connectedIter]))
{
if(vertexIsFixed[vertexCt])
{
continue;
}
if(verticesArePlanar3(vertexCt, connectedVertices[vertexCt], vertexData[material]))
{
//FIXME - I'm not hapy that we have to use rbegin() here rather than begin().
//Surely it should be possible to merge with any vertex? Not just the last one?
std::set<uint>::iterator connectedIter = connectedVertices[vertexCt].begin();
for(uint triCt = 0; triCt < indexData[material].size(); triCt++)
{
//if(vertexIsFixed[indexData[material][triCt].v0] == false)
/*for(uint triCt = 0; triCt < indexData[material].size(); triCt++)
{
if(indexData[material][triCt].v0 == vertexCt)
{
indexData[material][triCt].v0 = *connectedIter;
}
//if(vertexIsFixed[indexData[material][triCt].v1] == false)
{
if(indexData[material][triCt].v1 == vertexCt)
{
indexData[material][triCt].v1 = *connectedIter;
}
//if(vertexIsFixed[indexData[material][triCt].v2] == false)
{
if(indexData[material][triCt].v2 == vertexCt)
{
indexData[material][triCt].v2 = *connectedIter;
}
/*}
else
{
if((indexData[material][triCt].v0 == vertexCt) && (noOfEdges[indexData[material][triCt].v0] == noOfEdges[vertexCt]))
indexData[material][triCt].v0 = *connectedIter;
if((indexData[material][triCt].v1 == vertexCt) && (noOfEdges[indexData[material][triCt].v1] == noOfEdges[vertexCt]))
indexData[material][triCt].v1 = *connectedIter;
if((indexData[material][triCt].v2 == vertexCt) && (noOfEdges[indexData[material][triCt].v2] == noOfEdges[vertexCt]))
indexData[material][triCt].v2 = *connectedIter;
}*/
}
}
}
}
}
}
//Hide degenerate triangles
/*for(uint triCt = 0; triCt < indexData.size(); triCt++)
for(uint innerVertexCt = 0; innerVertexCt < vertexData[material].size(); innerVertexCt++)
{
if((indexData[material][triCt].v0 == indexData[material][triCt].v1) && (indexData[material][triCt].v1 == indexData[material][triCt].v2))
if(vertexData[material][innerVertexCt].position.distance(vertexData[material][vertexCt].position) < 0.1)
{
indexData[material][triCt].v0 = 0;
indexData[material][triCt].v1 = 0;
indexData[material][triCt].v2 = 0;
if((initialConnections[innerVertexCt] == 6) || (initialConnections[innerVertexCt] == initialConnections[*connectedIter]))
vertexData[material][innerVertexCt].position = vertexData[material][*connectedIter].position;
}
}
}
}
}
}
//Delete degenerate triangles
std::vector<Vertex> resultingVertexData;
std::vector<Triangle> resultingIndexData;
for(uint triCt = 0; triCt < indexData[material].size(); triCt++)
{
if((indexData[material][triCt].v0 != indexData[material][triCt].v1) || (indexData[material][triCt].v1 != indexData[material][triCt].v2))
{
uint pos = resultingVertexData.size();
resultingVertexData.push_back(vertexData[material][indexData[material][triCt].v0]);
resultingVertexData.push_back(vertexData[material][indexData[material][triCt].v1]);
resultingVertexData.push_back(vertexData[material][indexData[material][triCt].v2]);
Triangle triangle(pos, pos+1, pos+2);
resultingIndexData.push_back(triangle);
}
}
vertexData[material] = resultingVertexData;
indexData[material] = resultingIndexData;
}
}*/
}
bool PolyVoxSceneManager::verticesArePlanar3(uint uCurrentVertex, std::set<uint> setConnectedVertices, std::vector<Vertex>& vertexData) const
{
//FIXME - specially handle the case where they are all the same.
//This is happening a lot after many vertices have been moved round?
bool allXMatch = true;
bool allYMatch = true;
bool allZMatch = true;