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Brought back extractSubset from Thermite. Fixed to work with PositionMaterial vertices. Also made it a free function.

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This commit is contained in:
David Williams
2011-01-23 17:41:06 +00:00
parent c1ebed678e
commit ae3ac704e4
3 changed files with 73 additions and 3 deletions
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67
library/PolyVoxCore/include/SurfaceMesh.inl
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@ -394,4 +394,71 @@ namespace PolyVox
m_vecTriangleIndices[triCt] = newPos[m_vecTriangleIndices[triCt]];
}
}
//Currently a free function - think where this needs to go.
template <typename VertexType>
polyvox_shared_ptr< SurfaceMesh<VertexType> > extractSubset(SurfaceMesh<VertexType>& inputMesh, std::set<uint8_t> setMaterials)
{
polyvox_shared_ptr< SurfaceMesh<VertexType> > result(new SurfaceMesh<VertexType>);
if(inputMesh.m_vecVertices.size() == 0) //FIXME - I don't think we should need this test, but I have seen crashes otherwise...
{
return result;
}
assert(inputMesh.m_vecLodRecords.size() == 1);
if(inputMesh.m_vecLodRecords.size() != 1)
{
//If we have done progressive LOD then it's too late to split into subsets.
return result;
}
std::vector<int32_t> indexMap(inputMesh.m_vecVertices.size());
std::fill(indexMap.begin(), indexMap.end(), -1);
for(uint32_t triCt = 0; triCt < inputMesh.m_vecTriangleIndices.size(); triCt += 3)
{
VertexType& v0 = inputMesh.m_vecVertices[inputMesh.m_vecTriangleIndices[triCt]];
VertexType& v1 = inputMesh.m_vecVertices[inputMesh.m_vecTriangleIndices[triCt + 1]];
VertexType& v2 = inputMesh.m_vecVertices[inputMesh.m_vecTriangleIndices[triCt + 2]];
if(
(setMaterials.find(v0.getMaterial()) != setMaterials.end()) ||
(setMaterials.find(v1.getMaterial()) != setMaterials.end()) ||
(setMaterials.find(v2.getMaterial()) != setMaterials.end()))
{
uint32_t i0;
if(indexMap[inputMesh.m_vecTriangleIndices[triCt]] == -1)
{
indexMap[inputMesh.m_vecTriangleIndices[triCt]] = result->addVertex(v0);
}
i0 = indexMap[inputMesh.m_vecTriangleIndices[triCt]];
uint32_t i1;
if(indexMap[inputMesh.m_vecTriangleIndices[triCt+1]] == -1)
{
indexMap[inputMesh.m_vecTriangleIndices[triCt+1]] = result->addVertex(v1);
}
i1 = indexMap[inputMesh.m_vecTriangleIndices[triCt+1]];
uint32_t i2;
if(indexMap[inputMesh.m_vecTriangleIndices[triCt+2]] == -1)
{
indexMap[inputMesh.m_vecTriangleIndices[triCt+2]] = result->addVertex(v2);
}
i2 = indexMap[inputMesh.m_vecTriangleIndices[triCt+2]];
result->addTriangle(i0,i1,i2);
}
}
result->m_vecLodRecords.clear();
LodRecord lodRecord;
lodRecord.beginIndex = 0;
lodRecord.endIndex = result->getNoOfIndices();
result->m_vecLodRecords.push_back(lodRecord);
return result;
}
}