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Initial version of mesh decimation.

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This commit is contained in:
David Williams
2008-06-10 21:45:38 +00:00
parent f8a090abba
commit 33cb721cc0
7 changed files with 324 additions and 3 deletions
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1
PolyVoxCore/include/BlockVolumeIterator.h
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@ -44,6 +44,7 @@ namespace PolyVox
bool operator>=(const BlockVolumeIterator& rhs);
float getAveragedVoxel(boost::uint16_t size) const;
VoxelType getMaxedVoxel(void) const;
boost::uint16_t getPosX(void) const;
boost::uint16_t getPosY(void) const;
boost::uint16_t getPosZ(void) const;

15
PolyVoxCore/include/BlockVolumeIterator.inl
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@ -136,6 +136,21 @@ namespace PolyVox
return sum;
}
template <typename VoxelType>
VoxelType BlockVolumeIterator<VoxelType>::getMaxedVoxel(void) const
{
VoxelType tValue = getVoxel();
tValue = (std::max)(tValue, peekVoxel1px0py0pz());
tValue = (std::max)(tValue, peekVoxel0px1py0pz());
tValue = (std::max)(tValue, peekVoxel1px1py0pz());
tValue = (std::max)(tValue, peekVoxel0px0py1pz());
tValue = (std::max)(tValue, peekVoxel1px0py1pz());
tValue = (std::max)(tValue, peekVoxel0px1py1pz());
tValue = (std::max)(tValue, peekVoxel1px1py1pz());
return tValue;
}
template <typename VoxelType>
boost::uint16_t BlockVolumeIterator<VoxelType>::getPosX(void) const
{

3
PolyVoxCore/include/GradientEstimators.h
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@ -32,6 +32,9 @@ namespace PolyVox
template <typename VoxelType>
Vector3DFloat computeSmoothCentralDifferenceGradient(BlockVolumeIterator<VoxelType>& volIter);
template <typename VoxelType>
Vector3DFloat computeDecimatedCentralDifferenceGradient(BlockVolumeIterator<VoxelType>& volIter);
template <typename VoxelType>
Vector3DFloat computeSobelGradient(const BlockVolumeIterator<VoxelType>& volIter);
}

25
PolyVoxCore/include/GradientEstimators.inl
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@ -42,6 +42,31 @@ namespace PolyVox
);
}
template <typename VoxelType>
Vector3DFloat computeDecimatedCentralDifferenceGradient(const BlockVolumeIterator<VoxelType>& volIter)
{
const uint16_t x = volIter.getPosX();
const uint16_t y = volIter.getPosY();
const uint16_t z = volIter.getPosZ();
//FIXME - bitwise way of doing this?
VoxelType voxel1nx = volIter.getVoxelAt(x-2, y ,z ) > 0 ? 1: 0;
VoxelType voxel1px = volIter.getVoxelAt(x-2, y ,z ) > 0 ? 1: 0;
VoxelType voxel1ny = volIter.getVoxelAt(x , y-2,z ) > 0 ? 1: 0;
VoxelType voxel1py = volIter.getVoxelAt(x , y-2,z ) > 0 ? 1: 0;
VoxelType voxel1nz = volIter.getVoxelAt(x , y ,z-2) > 0 ? 1: 0;
VoxelType voxel1pz = volIter.getVoxelAt(x , y ,z-2) > 0 ? 1: 0;
return Vector3DFloat
(
static_cast<float>(voxel1px) - static_cast<float>(voxel1nx),
static_cast<float>(voxel1py) - static_cast<float>(voxel1ny),
static_cast<float>(voxel1pz) - static_cast<float>(voxel1nz)
);
}
template <typename VoxelType>
Vector3DFloat computeSmoothCentralDifferenceGradient(BlockVolumeIterator<VoxelType>& volIter)
{

2
PolyVoxCore/include/SurfaceExtractors.h
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@ -49,6 +49,8 @@ namespace PolyVox
POLYVOX_API void generateSmoothMeshDataForRegion(BlockVolume<boost::uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch);
POLYVOX_API Vector3DFloat computeSmoothNormal(BlockVolume<boost::uint8_t>* volumeData, const Vector3DFloat& position, NormalGenerationMethod normalGenerationMethod);
POLYVOX_API void generateDecimatedMeshDataForRegion(BlockVolume<boost::uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch);
}
#endif