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Improved extractSubset() to generate more memory efficient meshes.

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This commit is contained in:
David Williams 2009-11-05 20:56:36 +00:00
parent e820b3de6e
commit a1f5d4dc73
1 changed files with 41 additions and 10 deletions
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51
library/PolyVoxCore/source/IndexedSurfacePatch.cpp
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@ -313,28 +313,59 @@ namespace PolyVox
return result;
}
for(vector<uint32_t>::iterator iterIndex = m_vecTriangleIndices.begin(); iterIndex != m_vecTriangleIndices.end();)
assert(m_vecLodRecords.size() == 1);
if(m_vecLodRecords.size() != 1)
{
SurfaceVertex& v0 = m_vecVertices[*iterIndex];
iterIndex++;
SurfaceVertex& v1 = m_vecVertices[*iterIndex];
iterIndex++;
SurfaceVertex& v2 = m_vecVertices[*iterIndex];
iterIndex++;
//If we have done progressive LOD then it's too late to split into subsets.
return result;
}
std::vector<int32_t> indexMap(m_vecVertices.size());
std::fill(indexMap.begin(), indexMap.end(), -1);
for(uint32_t triCt = 0; triCt < m_vecTriangleIndices.size(); triCt += 3)
{
SurfaceVertex& v0 = m_vecVertices[m_vecTriangleIndices[triCt]];
SurfaceVertex& v1 = m_vecVertices[m_vecTriangleIndices[triCt + 1]];
SurfaceVertex& v2 = m_vecVertices[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 = result->addVertex(v0);
uint32_t i1 = result->addVertex(v1);
uint32_t i2 = result->addVertex(v2);
uint32_t i0;
if(indexMap[m_vecTriangleIndices[triCt]] == -1)
{
indexMap[m_vecTriangleIndices[triCt]] = result->addVertex(v0);
}
i0 = indexMap[m_vecTriangleIndices[triCt]];
uint32_t i1;
if(indexMap[m_vecTriangleIndices[triCt+1]] == -1)
{
indexMap[m_vecTriangleIndices[triCt+1]] = result->addVertex(v1);
}
i1 = indexMap[m_vecTriangleIndices[triCt+1]];
uint32_t i2;
if(indexMap[m_vecTriangleIndices[triCt+2]] == -1)
{
indexMap[m_vecTriangleIndices[triCt+2]] = result->addVertex(v2);
}
i2 = indexMap[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;
}