Rather ugly split of some code into a separate function, to keep the main loop as small and simple as possible. To be tidied up shortly.
This commit is contained in:
David Williams
parent
e0ce93acb1
commit
13be35aac9
@ -159,7 +159,7 @@ namespace PolyVox
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private:
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//Compute the cell bitmask for a particular slice in z.
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void computeBitmaskForSlice();
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void generateMeshForCell(uint32_t uXRegSpace, uint32_t uYRegSpace, uint32_t uZRegSpace, typename VolumeType::Sampler& sampler, typename VolumeType::VoxelType v111, uint8_t iCubeIndex, Array3DInt32& pIndicesX, Array3DInt32& pIndicesY, Array3DInt32& pIndicesZ, int32_t iXVolSpace, int32_t iYVolSpace, int32_t iZVolSpace);
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////////////////////////////////////////////////////////////////////////////////
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// NOTE: These two functions are in the .h file rather than the .inl due to an apparent bug in VC2010.
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@ -42,18 +42,6 @@ namespace PolyVox
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Timer timer;
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m_meshCurrent->clear();
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computeBitmaskForSlice();
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m_meshCurrent->setOffset(m_regSizeInVoxels.getLowerCorner());
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POLYVOX_LOG_TRACE("Marching cubes surface extraction took ", timer.elapsedTimeInMilliSeconds(),
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"ms (Region size = ", m_regSizeInVoxels.getWidthInVoxels(), "x", m_regSizeInVoxels.getHeightInVoxels(),
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"x", m_regSizeInVoxels.getDepthInVoxels(), ")");
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}
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template<typename VolumeType, typename MeshType, typename ControllerType>
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void MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::computeBitmaskForSlice()
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{
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const uint32_t uArrayWidth = m_regSizeInVoxels.getUpperX() - m_regSizeInVoxels.getLowerX() + 2;
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const uint32_t uArrayHeight = m_regSizeInVoxels.getUpperY() - m_regSizeInVoxels.getLowerY() + 2;
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const uint32_t uArrayDepth = m_regSizeInVoxels.getUpperZ() - m_regSizeInVoxels.getLowerZ() + 2;
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@ -130,196 +118,208 @@ namespace PolyVox
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/* Cube is entirely in/out of the surface */
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if (edgeTable[iCubeIndex] != 0)
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{
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generateMeshForCell(uXRegSpace, uYRegSpace, uZRegSpace, sampler, v111, iCubeIndex, pIndicesX, pIndicesY, pIndicesZ, iXVolSpace, iYVolSpace, iZVolSpace);
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}
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// These three might not have been sampled, as v111 is the only one we sample every iteration.
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typename VolumeType::VoxelType v110 = sampler.peekVoxel0px0py1nz();
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typename VolumeType::VoxelType v101 = sampler.peekVoxel0px1ny0pz();
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typename VolumeType::VoxelType v011 = sampler.peekVoxel1nx0py0pz();
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const Vector3DFloat n000 = computeCentralDifferenceGradient(sampler);
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/* Find the vertices where the surface intersects the cube */
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if ((edgeTable[iCubeIndex] & 64) && (uXRegSpace > 0))
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{
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sampler.moveNegativeX();
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POLYVOX_ASSERT(v011 != v111, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n100 = computeCentralDifferenceGradient(sampler);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v011)) / static_cast<float>(m_controller.convertToDensity(v111) - m_controller.convertToDensity(v011));
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const Vector3DFloat v3dPosition(static_cast<float>(uXRegSpace - 1) + fInterp, static_cast<float>(uYRegSpace), static_cast<float>(uZRegSpace));
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const Vector3DUint16 v3dScaledPosition(static_cast<uint16_t>(v3dPosition.getX() * 256.0f), static_cast<uint16_t>(v3dPosition.getY() * 256.0f), static_cast<uint16_t>(v3dPosition.getZ() * 256.0f));
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Vector3DFloat v3dNormal = (n100*fInterp) + (n000*(1 - fInterp));
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// The gradient for a voxel can be zero (e.g. solid voxel surrounded by empty ones) and so
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// the interpolated normal can also be zero (e.g. a grid of alternating solid and empty voxels).
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if (v3dNormal.lengthSquared() > 0.000001f)
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{
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v3dNormal.normalise();
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}
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// Allow the controller to decide how the material should be derived from the voxels.
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const typename VolumeType::VoxelType uMaterial = m_controller.blendMaterials(v011, v111, fInterp);
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MarchingCubesVertex<typename VolumeType::VoxelType> surfaceVertex;
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surfaceVertex.encodedPosition = v3dScaledPosition;
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surfaceVertex.encodedNormal = encodeNormal(v3dNormal);
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surfaceVertex.data = uMaterial;
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const uint32_t uLastVertexIndex = m_meshCurrent->addVertex(surfaceVertex);
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pIndicesX(uXRegSpace, uYRegSpace, uZRegSpace) = uLastVertexIndex;
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sampler.movePositiveX();
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}
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if ((edgeTable[iCubeIndex] & 32) && (uYRegSpace > 0))
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{
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sampler.moveNegativeY();
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POLYVOX_ASSERT(v101 != v111, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n010 = computeCentralDifferenceGradient(sampler);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v101)) / static_cast<float>(m_controller.convertToDensity(v111) - m_controller.convertToDensity(v101));
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const Vector3DFloat v3dPosition(static_cast<float>(uXRegSpace), static_cast<float>(uYRegSpace - 1) + fInterp, static_cast<float>(uZRegSpace));
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const Vector3DUint16 v3dScaledPosition(static_cast<uint16_t>(v3dPosition.getX() * 256.0f), static_cast<uint16_t>(v3dPosition.getY() * 256.0f), static_cast<uint16_t>(v3dPosition.getZ() * 256.0f));
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Vector3DFloat v3dNormal = (n010*fInterp) + (n000*(1 - fInterp));
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// The gradient for a voxel can be zero (e.g. solid voxel surrounded by empty ones) and so
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// the interpolated normal can also be zero (e.g. a grid of alternating solid and empty voxels).
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if (v3dNormal.lengthSquared() > 0.000001f)
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{
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v3dNormal.normalise();
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}
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// Allow the controller to decide how the material should be derived from the voxels.
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const typename VolumeType::VoxelType uMaterial = m_controller.blendMaterials(v101, v111, fInterp);
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MarchingCubesVertex<typename VolumeType::VoxelType> surfaceVertex;
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surfaceVertex.encodedPosition = v3dScaledPosition;
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surfaceVertex.encodedNormal = encodeNormal(v3dNormal);
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surfaceVertex.data = uMaterial;
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uint32_t uLastVertexIndex = m_meshCurrent->addVertex(surfaceVertex);
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pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace) = uLastVertexIndex;
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sampler.movePositiveY();
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}
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if ((edgeTable[iCubeIndex] & 1024) && (uZRegSpace > 0))
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{
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sampler.moveNegativeZ();
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POLYVOX_ASSERT(v110 != v111, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n001 = computeCentralDifferenceGradient(sampler);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v110)) / static_cast<float>(m_controller.convertToDensity(v111) - m_controller.convertToDensity(v110));
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const Vector3DFloat v3dPosition(static_cast<float>(uXRegSpace), static_cast<float>(uYRegSpace), static_cast<float>(uZRegSpace - 1) + fInterp);
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const Vector3DUint16 v3dScaledPosition(static_cast<uint16_t>(v3dPosition.getX() * 256.0f), static_cast<uint16_t>(v3dPosition.getY() * 256.0f), static_cast<uint16_t>(v3dPosition.getZ() * 256.0f));
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Vector3DFloat v3dNormal = (n001*fInterp) + (n000*(1 - fInterp));
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// The gradient for a voxel can be zero (e.g. solid voxel surrounded by empty ones) and so
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// the interpolated normal can also be zero (e.g. a grid of alternating solid and empty voxels).
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if (v3dNormal.lengthSquared() > 0.000001f)
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{
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v3dNormal.normalise();
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}
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// Allow the controller to decide how the material should be derived from the voxels.
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const typename VolumeType::VoxelType uMaterial = m_controller.blendMaterials(v110, v111, fInterp);
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MarchingCubesVertex<typename VolumeType::VoxelType> surfaceVertex;
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surfaceVertex.encodedPosition = v3dScaledPosition;
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surfaceVertex.encodedNormal = encodeNormal(v3dNormal);
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surfaceVertex.data = uMaterial;
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const uint32_t uLastVertexIndex = m_meshCurrent->addVertex(surfaceVertex);
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pIndicesZ(uXRegSpace, uYRegSpace, uZRegSpace) = uLastVertexIndex;
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sampler.movePositiveZ();
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}
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// Now output the indices. For the first row, column or slice there aren't
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// any (the region size in cells is one less than the region size in voxels)
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if ((uXRegSpace != 0) && (uYRegSpace != 0) && (uZRegSpace != 0))
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{
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int32_t indlist[12];
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sampler.setPosition(iXVolSpace, iYVolSpace, iZVolSpace);
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/* Cube is entirely in/out of the surface */
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if (edgeTable[iCubeIndex] != 0)
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{
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/* Find the vertices where the surface intersects the cube */
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if (edgeTable[iCubeIndex] & 1)
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{
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indlist[0] = pIndicesX(uXRegSpace, uYRegSpace - 1, uZRegSpace - 1);
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}
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if (edgeTable[iCubeIndex] & 2)
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{
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indlist[1] = pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace - 1);
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}
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if (edgeTable[iCubeIndex] & 4)
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{
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indlist[2] = pIndicesX(uXRegSpace, uYRegSpace, uZRegSpace - 1);
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}
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if (edgeTable[iCubeIndex] & 8)
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{
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indlist[3] = pIndicesY(uXRegSpace - 1, uYRegSpace, uZRegSpace - 1);
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}
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if (edgeTable[iCubeIndex] & 16)
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{
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indlist[4] = pIndicesX(uXRegSpace, uYRegSpace - 1, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 32)
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{
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indlist[5] = pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 64)
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{
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indlist[6] = pIndicesX(uXRegSpace, uYRegSpace, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 128)
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{
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indlist[7] = pIndicesY(uXRegSpace - 1, uYRegSpace, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 256)
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{
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indlist[8] = pIndicesZ(uXRegSpace - 1, uYRegSpace - 1, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 512)
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{
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indlist[9] = pIndicesZ(uXRegSpace, uYRegSpace - 1, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 1024)
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{
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indlist[10] = pIndicesZ(uXRegSpace, uYRegSpace, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 2048)
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{
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indlist[11] = pIndicesZ(uXRegSpace - 1, uYRegSpace, uZRegSpace);
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}
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for (int i = 0; triTable[iCubeIndex][i] != -1; i += 3)
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{
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const int32_t ind0 = indlist[triTable[iCubeIndex][i]];
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const int32_t ind1 = indlist[triTable[iCubeIndex][i + 1]];
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const int32_t ind2 = indlist[triTable[iCubeIndex][i + 2]];
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if ((ind0 != -1) && (ind1 != -1) && (ind2 != -1))
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{
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m_meshCurrent->addTriangle(ind0, ind1, ind2);
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}
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} // For each triangle
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}
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}
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} // For each cell
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sampler.movePositiveX();
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} // For X
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startOfRow.movePositiveY();
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} // For Y
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startOfSlice.movePositiveZ();
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} // For Z
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m_meshCurrent->setOffset(m_regSizeInVoxels.getLowerCorner());
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POLYVOX_LOG_TRACE("Marching cubes surface extraction took ", timer.elapsedTimeInMilliSeconds(),
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"ms (Region size = ", m_regSizeInVoxels.getWidthInVoxels(), "x", m_regSizeInVoxels.getHeightInVoxels(),
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"x", m_regSizeInVoxels.getDepthInVoxels(), ")");
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}
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template<typename VolumeType, typename MeshType, typename ControllerType>
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void MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::generateMeshForCell(uint32_t uXRegSpace, uint32_t uYRegSpace, uint32_t uZRegSpace, typename VolumeType::Sampler& sampler, typename VolumeType::VoxelType v111, uint8_t iCubeIndex, Array3DInt32& pIndicesX, Array3DInt32& pIndicesY, Array3DInt32& pIndicesZ, int32_t iXVolSpace, int32_t iYVolSpace, int32_t iZVolSpace)
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{
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// These three might not have been sampled, as v111 is the only one we sample every iteration.
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typename VolumeType::VoxelType v110 = sampler.peekVoxel0px0py1nz();
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typename VolumeType::VoxelType v101 = sampler.peekVoxel0px1ny0pz();
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typename VolumeType::VoxelType v011 = sampler.peekVoxel1nx0py0pz();
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const Vector3DFloat n000 = computeCentralDifferenceGradient(sampler);
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/* Find the vertices where the surface intersects the cube */
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if ((edgeTable[iCubeIndex] & 64) && (uXRegSpace > 0))
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{
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sampler.moveNegativeX();
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POLYVOX_ASSERT(v011 != v111, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n100 = computeCentralDifferenceGradient(sampler);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v011)) / static_cast<float>(m_controller.convertToDensity(v111) - m_controller.convertToDensity(v011));
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const Vector3DFloat v3dPosition(static_cast<float>(uXRegSpace - 1) + fInterp, static_cast<float>(uYRegSpace), static_cast<float>(uZRegSpace));
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const Vector3DUint16 v3dScaledPosition(static_cast<uint16_t>(v3dPosition.getX() * 256.0f), static_cast<uint16_t>(v3dPosition.getY() * 256.0f), static_cast<uint16_t>(v3dPosition.getZ() * 256.0f));
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Vector3DFloat v3dNormal = (n100*fInterp) + (n000*(1 - fInterp));
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// The gradient for a voxel can be zero (e.g. solid voxel surrounded by empty ones) and so
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// the interpolated normal can also be zero (e.g. a grid of alternating solid and empty voxels).
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if (v3dNormal.lengthSquared() > 0.000001f)
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{
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v3dNormal.normalise();
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}
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// Allow the controller to decide how the material should be derived from the voxels.
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const typename VolumeType::VoxelType uMaterial = m_controller.blendMaterials(v011, v111, fInterp);
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MarchingCubesVertex<typename VolumeType::VoxelType> surfaceVertex;
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surfaceVertex.encodedPosition = v3dScaledPosition;
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surfaceVertex.encodedNormal = encodeNormal(v3dNormal);
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surfaceVertex.data = uMaterial;
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const uint32_t uLastVertexIndex = m_meshCurrent->addVertex(surfaceVertex);
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pIndicesX(uXRegSpace, uYRegSpace, uZRegSpace) = uLastVertexIndex;
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sampler.movePositiveX();
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}
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if ((edgeTable[iCubeIndex] & 32) && (uYRegSpace > 0))
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{
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sampler.moveNegativeY();
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POLYVOX_ASSERT(v101 != v111, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n010 = computeCentralDifferenceGradient(sampler);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v101)) / static_cast<float>(m_controller.convertToDensity(v111) - m_controller.convertToDensity(v101));
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const Vector3DFloat v3dPosition(static_cast<float>(uXRegSpace), static_cast<float>(uYRegSpace - 1) + fInterp, static_cast<float>(uZRegSpace));
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const Vector3DUint16 v3dScaledPosition(static_cast<uint16_t>(v3dPosition.getX() * 256.0f), static_cast<uint16_t>(v3dPosition.getY() * 256.0f), static_cast<uint16_t>(v3dPosition.getZ() * 256.0f));
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Vector3DFloat v3dNormal = (n010*fInterp) + (n000*(1 - fInterp));
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// The gradient for a voxel can be zero (e.g. solid voxel surrounded by empty ones) and so
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// the interpolated normal can also be zero (e.g. a grid of alternating solid and empty voxels).
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if (v3dNormal.lengthSquared() > 0.000001f)
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{
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v3dNormal.normalise();
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}
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// Allow the controller to decide how the material should be derived from the voxels.
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const typename VolumeType::VoxelType uMaterial = m_controller.blendMaterials(v101, v111, fInterp);
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MarchingCubesVertex<typename VolumeType::VoxelType> surfaceVertex;
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surfaceVertex.encodedPosition = v3dScaledPosition;
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surfaceVertex.encodedNormal = encodeNormal(v3dNormal);
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surfaceVertex.data = uMaterial;
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uint32_t uLastVertexIndex = m_meshCurrent->addVertex(surfaceVertex);
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pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace) = uLastVertexIndex;
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sampler.movePositiveY();
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}
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if ((edgeTable[iCubeIndex] & 1024) && (uZRegSpace > 0))
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{
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sampler.moveNegativeZ();
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POLYVOX_ASSERT(v110 != v111, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n001 = computeCentralDifferenceGradient(sampler);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v110)) / static_cast<float>(m_controller.convertToDensity(v111) - m_controller.convertToDensity(v110));
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const Vector3DFloat v3dPosition(static_cast<float>(uXRegSpace), static_cast<float>(uYRegSpace), static_cast<float>(uZRegSpace - 1) + fInterp);
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const Vector3DUint16 v3dScaledPosition(static_cast<uint16_t>(v3dPosition.getX() * 256.0f), static_cast<uint16_t>(v3dPosition.getY() * 256.0f), static_cast<uint16_t>(v3dPosition.getZ() * 256.0f));
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Vector3DFloat v3dNormal = (n001*fInterp) + (n000*(1 - fInterp));
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// The gradient for a voxel can be zero (e.g. solid voxel surrounded by empty ones) and so
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// the interpolated normal can also be zero (e.g. a grid of alternating solid and empty voxels).
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if (v3dNormal.lengthSquared() > 0.000001f)
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{
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v3dNormal.normalise();
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}
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// Allow the controller to decide how the material should be derived from the voxels.
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const typename VolumeType::VoxelType uMaterial = m_controller.blendMaterials(v110, v111, fInterp);
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MarchingCubesVertex<typename VolumeType::VoxelType> surfaceVertex;
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surfaceVertex.encodedPosition = v3dScaledPosition;
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surfaceVertex.encodedNormal = encodeNormal(v3dNormal);
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surfaceVertex.data = uMaterial;
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const uint32_t uLastVertexIndex = m_meshCurrent->addVertex(surfaceVertex);
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pIndicesZ(uXRegSpace, uYRegSpace, uZRegSpace) = uLastVertexIndex;
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sampler.movePositiveZ();
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}
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// Now output the indices. For the first row, column or slice there aren't
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// any (the region size in cells is one less than the region size in voxels)
|
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if ((uXRegSpace != 0) && (uYRegSpace != 0) && (uZRegSpace != 0))
|
||||
{
|
||||
|
||||
int32_t indlist[12];
|
||||
|
||||
sampler.setPosition(iXVolSpace, iYVolSpace, iZVolSpace);
|
||||
|
||||
/* Cube is entirely in/out of the surface */
|
||||
if (edgeTable[iCubeIndex] != 0)
|
||||
{
|
||||
|
||||
/* Find the vertices where the surface intersects the cube */
|
||||
if (edgeTable[iCubeIndex] & 1)
|
||||
{
|
||||
indlist[0] = pIndicesX(uXRegSpace, uYRegSpace - 1, uZRegSpace - 1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 2)
|
||||
{
|
||||
indlist[1] = pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace - 1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 4)
|
||||
{
|
||||
indlist[2] = pIndicesX(uXRegSpace, uYRegSpace, uZRegSpace - 1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 8)
|
||||
{
|
||||
indlist[3] = pIndicesY(uXRegSpace - 1, uYRegSpace, uZRegSpace - 1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 16)
|
||||
{
|
||||
indlist[4] = pIndicesX(uXRegSpace, uYRegSpace - 1, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 32)
|
||||
{
|
||||
indlist[5] = pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 64)
|
||||
{
|
||||
indlist[6] = pIndicesX(uXRegSpace, uYRegSpace, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 128)
|
||||
{
|
||||
indlist[7] = pIndicesY(uXRegSpace - 1, uYRegSpace, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 256)
|
||||
{
|
||||
indlist[8] = pIndicesZ(uXRegSpace - 1, uYRegSpace - 1, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 512)
|
||||
{
|
||||
indlist[9] = pIndicesZ(uXRegSpace, uYRegSpace - 1, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 1024)
|
||||
{
|
||||
indlist[10] = pIndicesZ(uXRegSpace, uYRegSpace, uZRegSpace);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 2048)
|
||||
{
|
||||
indlist[11] = pIndicesZ(uXRegSpace - 1, uYRegSpace, uZRegSpace);
|
||||
}
|
||||
|
||||
for (int i = 0; triTable[iCubeIndex][i] != -1; i += 3)
|
||||
{
|
||||
const int32_t ind0 = indlist[triTable[iCubeIndex][i]];
|
||||
const int32_t ind1 = indlist[triTable[iCubeIndex][i + 1]];
|
||||
const int32_t ind2 = indlist[triTable[iCubeIndex][i + 2]];
|
||||
|
||||
if ((ind0 != -1) && (ind1 != -1) && (ind2 != -1))
|
||||
{
|
||||
m_meshCurrent->addTriangle(ind0, ind1, ind2);
|
||||
}
|
||||
} // For each triangle
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user