398 lines
18 KiB
C++
398 lines
18 KiB
C++
/*******************************************************************************
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Copyright (c) 2005-2009 David Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#include "PolyVox/Impl/Timer.h"
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namespace PolyVox
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{
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template<typename VolumeType, typename MeshType, typename ControllerType>
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MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::MarchingCubesSurfaceExtractor(VolumeType* volData, Region region, MeshType* result, ControllerType controller)
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:m_volData(volData)
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,m_sampVolume(volData)
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,m_meshCurrent(result)
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,m_regSizeInVoxels(region)
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,m_controller(controller)
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,m_tThreshold(m_controller.getThreshold())
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{
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POLYVOX_THROW_IF(m_meshCurrent == nullptr, std::invalid_argument, "Provided mesh cannot be null");
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//m_regSizeInVoxels.cropTo(m_volData->getEnclosingRegion());
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m_regSizeInCells = m_regSizeInVoxels;
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m_regSizeInCells.setUpperCorner(m_regSizeInCells.getUpperCorner() - Vector3DInt32(1,1,1));
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}
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template<typename VolumeType, typename MeshType, typename ControllerType>
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void MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::execute()
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{
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Timer timer;
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m_meshCurrent->clear();
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const uint32_t uArrayWidth = m_regSizeInVoxels.getUpperX() - m_regSizeInVoxels.getLowerX() + 1;
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const uint32_t uArrayHeight = m_regSizeInVoxels.getUpperY() - m_regSizeInVoxels.getLowerY() + 1;
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const uint32_t uArrayDepth = m_regSizeInVoxels.getUpperZ() - m_regSizeInVoxels.getLowerZ() + 1;
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//For edge indices
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Array3DInt32 pIndicesX(uArrayWidth, uArrayHeight, uArrayDepth);
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Array3DInt32 pIndicesY(uArrayWidth, uArrayHeight, uArrayDepth);
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Array3DInt32 pIndicesZ(uArrayWidth, uArrayHeight, uArrayDepth);
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memset(pIndicesX.getRawData(), 0xff, pIndicesX.getNoOfElements() * 4);
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memset(pIndicesY.getRawData(), 0xff, pIndicesY.getNoOfElements() * 4);
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memset(pIndicesZ.getRawData(), 0xff, pIndicesZ.getNoOfElements() * 4);
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Array3DUint8 pBitmask(uArrayWidth, uArrayHeight, uArrayDepth);
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//Create a region corresponding to the first slice
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m_regSlicePrevious = m_regSizeInVoxels;
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Vector3DInt32 v3dUpperCorner = m_regSlicePrevious.getUpperCorner();
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v3dUpperCorner.setZ(m_regSlicePrevious.getLowerZ()); //Set the upper z to the lower z to make it one slice thick.
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m_regSlicePrevious.setUpperCorner(v3dUpperCorner);
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m_regSliceCurrent = m_regSlicePrevious;
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computeBitmaskForSlice<true>(pBitmask);
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generateVerticesForSlice(pBitmask, pIndicesX, pIndicesY, pIndicesZ);
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m_regSlicePrevious = m_regSliceCurrent;
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m_regSliceCurrent.shift(Vector3DInt32(0,0,1));
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//Process the other slices (previous slice is available)
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for(int32_t uSlice = 1; uSlice <= m_regSizeInVoxels.getUpperZ() - m_regSizeInVoxels.getLowerZ(); uSlice++)
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{
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generateIndicesForSlice(pBitmask, pIndicesX, pIndicesY, pIndicesZ);
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m_regSlicePrevious = m_regSliceCurrent;
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m_regSliceCurrent.shift(Vector3DInt32(0,0,1));
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}
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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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template<bool isPrevZAvail>
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void MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::computeBitmaskForSlice(Array3DUint8& pBitmask)
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{
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const int32_t iMaxXVolSpace = m_regSizeInVoxels.getUpperX();
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const int32_t iMaxYVolSpace = m_regSizeInVoxels.getUpperY();
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const int32_t iMaxZVolSpace = m_regSizeInVoxels.getUpperZ();
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for (int32_t iZVolSpace = m_regSliceCurrent.getLowerZ(); iZVolSpace <= iMaxZVolSpace; iZVolSpace++)
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{
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uint32_t uZRegSpace = iZVolSpace - m_regSizeInVoxels.getLowerZ();
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//Process all remaining elemnents of the slice. In this case, previous x and y values are always available
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for (int32_t iYVolSpace = m_regSliceCurrent.getLowerY(); iYVolSpace <= iMaxYVolSpace; iYVolSpace++)
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{
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m_sampVolume.setPosition(m_regSliceCurrent.getLowerX(), iYVolSpace, iZVolSpace);
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for (int32_t iXVolSpace = m_regSliceCurrent.getLowerX(); iXVolSpace <= iMaxXVolSpace; iXVolSpace++)
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{
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uint32_t uXRegSpace = iXVolSpace - m_regSizeInVoxels.getLowerX();
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uint32_t uYRegSpace = iYVolSpace - m_regSizeInVoxels.getLowerY();
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m_sampVolume.movePositiveX();
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m_sampVolume.setPosition(iXVolSpace, iYVolSpace, iZVolSpace);
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uint8_t iCubeIndex = 0;
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typename VolumeType::VoxelType v000 = m_sampVolume.getVoxel();
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typename VolumeType::VoxelType v100 = m_sampVolume.peekVoxel1px0py0pz();
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typename VolumeType::VoxelType v010 = m_sampVolume.peekVoxel0px1py0pz();
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typename VolumeType::VoxelType v110 = m_sampVolume.peekVoxel1px1py0pz();
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typename VolumeType::VoxelType v001 = m_sampVolume.peekVoxel0px0py1pz();
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typename VolumeType::VoxelType v101 = m_sampVolume.peekVoxel1px0py1pz();
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typename VolumeType::VoxelType v011 = m_sampVolume.peekVoxel0px1py1pz();
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typename VolumeType::VoxelType v111 = m_sampVolume.peekVoxel1px1py1pz();
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/*typename VolumeType::VoxelType v000 = m_sampVolume.peekVoxel0px0py1nz();
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typename VolumeType::VoxelType v100 = m_sampVolume.peekVoxel1px0py1nz();
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typename VolumeType::VoxelType v010 = m_sampVolume.peekVoxel0px1py1nz();
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typename VolumeType::VoxelType v110 = m_sampVolume.peekVoxel1px1py1nz();
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typename VolumeType::VoxelType v001 = m_sampVolume.peekVoxel0px0py0pz();
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typename VolumeType::VoxelType v101 = m_sampVolume.peekVoxel1px0py0pz();
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typename VolumeType::VoxelType v011 = m_sampVolume.peekVoxel0px1py0pz();
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typename VolumeType::VoxelType v111 = m_sampVolume.peekVoxel1px1py0pz();*/
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if (m_controller.convertToDensity(v000) < m_tThreshold) iCubeIndex |= 1;
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if (m_controller.convertToDensity(v100) < m_tThreshold) iCubeIndex |= 2;
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if (m_controller.convertToDensity(v010) < m_tThreshold) iCubeIndex |= 4;
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if (m_controller.convertToDensity(v110) < m_tThreshold) iCubeIndex |= 8;
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if (m_controller.convertToDensity(v001) < m_tThreshold) iCubeIndex |= 16;
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if (m_controller.convertToDensity(v101) < m_tThreshold) iCubeIndex |= 32;
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if (m_controller.convertToDensity(v011) < m_tThreshold) iCubeIndex |= 64;
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if (m_controller.convertToDensity(v111) < m_tThreshold) iCubeIndex |= 128;
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//Save the bitmask
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pBitmask(uXRegSpace, uYRegSpace, uZRegSpace) = iCubeIndex;
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}
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}
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}
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}
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template<typename VolumeType, typename MeshType, typename ControllerType>
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void MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::generateVerticesForSlice(const Array3DUint8& pBitmask,
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Array3DInt32& pIndicesX,
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Array3DInt32& pIndicesY,
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Array3DInt32& pIndicesZ)
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{
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for (int32_t iZVolSpace = m_regSliceCurrent.getLowerZ(); iZVolSpace <= m_regSizeInVoxels.getUpperZ(); iZVolSpace++)
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{
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uint32_t uZRegSpace = iZVolSpace - m_regSizeInVoxels.getLowerZ();
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for (int32_t iYVolSpace = m_regSliceCurrent.getLowerY(); iYVolSpace <= m_regSizeInVoxels.getUpperY(); iYVolSpace++)
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{
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const uint32_t uYRegSpace = iYVolSpace - m_regSizeInVoxels.getLowerY();
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for (int32_t iXVolSpace = m_regSliceCurrent.getLowerX(); iXVolSpace <= m_regSizeInVoxels.getUpperX(); iXVolSpace++)
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{
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//Current position
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const uint32_t uXRegSpace = iXVolSpace - m_regSizeInVoxels.getLowerX();
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//Determine the index into the edge table which tells us which vertices are inside of the surface
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const uint8_t iCubeIndex = pBitmask(uXRegSpace, uYRegSpace, uZRegSpace);
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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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continue;
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}
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//Check whether the generated vertex will lie on the edge of the region
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m_sampVolume.setPosition(iXVolSpace, iYVolSpace, iZVolSpace);
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const typename VolumeType::VoxelType v000 = m_sampVolume.getVoxel();
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const Vector3DFloat n000 = computeCentralDifferenceGradient(m_sampVolume);
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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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m_sampVolume.movePositiveX();
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const typename VolumeType::VoxelType v100 = m_sampVolume.getVoxel();
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POLYVOX_ASSERT(v000 != v100, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n100 = computeCentralDifferenceGradient(m_sampVolume);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v000)) / static_cast<float>(m_controller.convertToDensity(v100) - m_controller.convertToDensity(v000));
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const Vector3DFloat v3dPosition(static_cast<float>(iXVolSpace - m_regSizeInVoxels.getLowerX()) + fInterp, static_cast<float>(iYVolSpace - m_regSizeInVoxels.getLowerY()), static_cast<float>(iZVolSpace - m_regSizeInCells.getLowerZ()));
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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(v000, v100, 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(iXVolSpace - m_regSizeInVoxels.getLowerX(), iYVolSpace - m_regSizeInVoxels.getLowerY(), iZVolSpace - m_regSizeInVoxels.getLowerZ()) = uLastVertexIndex;
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m_sampVolume.moveNegativeX();
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}
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if (edgeTable[iCubeIndex] & 8)
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{
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m_sampVolume.movePositiveY();
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const typename VolumeType::VoxelType v010 = m_sampVolume.getVoxel();
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POLYVOX_ASSERT(v000 != v010, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n010 = computeCentralDifferenceGradient(m_sampVolume);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v000)) / static_cast<float>(m_controller.convertToDensity(v010) - m_controller.convertToDensity(v000));
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const Vector3DFloat v3dPosition(static_cast<float>(iXVolSpace - m_regSizeInVoxels.getLowerX()), static_cast<float>(iYVolSpace - m_regSizeInVoxels.getLowerY()) + fInterp, static_cast<float>(iZVolSpace - m_regSizeInVoxels.getLowerZ()));
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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(v000, v010, 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(iXVolSpace - m_regSizeInVoxels.getLowerX(), iYVolSpace - m_regSizeInVoxels.getLowerY(), iZVolSpace - m_regSizeInVoxels.getLowerZ()) = uLastVertexIndex;
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m_sampVolume.moveNegativeY();
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}
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if (edgeTable[iCubeIndex] & 256)
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{
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m_sampVolume.movePositiveZ();
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const typename VolumeType::VoxelType v001 = m_sampVolume.getVoxel();
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POLYVOX_ASSERT(v000 != v001, "Attempting to insert vertex between two voxels with the same value");
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const Vector3DFloat n001 = computeCentralDifferenceGradient(m_sampVolume);
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const float fInterp = static_cast<float>(m_tThreshold - m_controller.convertToDensity(v000)) / static_cast<float>(m_controller.convertToDensity(v001) - m_controller.convertToDensity(v000));
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const Vector3DFloat v3dPosition(static_cast<float>(iXVolSpace - m_regSizeInVoxels.getLowerX()), static_cast<float>(iYVolSpace - m_regSizeInVoxels.getLowerY()), static_cast<float>(iZVolSpace - m_regSizeInVoxels.getLowerZ()) + 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(v000, v001, 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(iXVolSpace - m_regSizeInVoxels.getLowerX(), iYVolSpace - m_regSizeInVoxels.getLowerY(), iZVolSpace - m_regSizeInVoxels.getLowerZ()) = uLastVertexIndex;
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m_sampVolume.moveNegativeZ();
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}
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}//For each cell
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}
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}
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}
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template<typename VolumeType, typename MeshType, typename ControllerType>
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void MarchingCubesSurfaceExtractor<VolumeType, MeshType, ControllerType>::generateIndicesForSlice(const Array3DUint8& pBitmask,
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const Array3DInt32& pIndicesX,
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const Array3DInt32& pIndicesY,
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const Array3DInt32& pIndicesZ)
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{
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int32_t indlist[12];
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for(int i = 0; i < 12; i++)
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{
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indlist[i] = -1;
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}
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const int32_t iZVolSpace = m_regSlicePrevious.getLowerZ();
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for(int32_t iYVolSpace = m_regSlicePrevious.getLowerY(); iYVolSpace <= m_regSizeInCells.getUpperY(); iYVolSpace++)
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{
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for(int32_t iXVolSpace = m_regSlicePrevious.getLowerX(); iXVolSpace <= m_regSizeInCells.getUpperX(); iXVolSpace++)
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{
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m_sampVolume.setPosition(iXVolSpace,iYVolSpace,iZVolSpace);
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//Current position
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const uint32_t uXRegSpace = m_sampVolume.getPosition().getX() - m_regSizeInVoxels.getLowerX();
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const uint32_t uYRegSpace = m_sampVolume.getPosition().getY() - m_regSizeInVoxels.getLowerY();
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const uint32_t uZRegSpace = m_sampVolume.getPosition().getZ() - m_regSizeInVoxels.getLowerZ();
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//Determine the index into the edge table which tells us which vertices are inside of the surface
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const uint8_t iCubeIndex = pBitmask(uXRegSpace, uYRegSpace, uZRegSpace);
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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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continue;
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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, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 2)
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{
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indlist[1] = pIndicesY(uXRegSpace + 1, uYRegSpace, uZRegSpace);
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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 + 1, uZRegSpace);
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}
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if (edgeTable[iCubeIndex] & 8)
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{
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indlist[3] = pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace);
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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, uZRegSpace + 1);
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}
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if (edgeTable[iCubeIndex] & 32)
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{
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indlist[5] = pIndicesY(uXRegSpace + 1, uYRegSpace, uZRegSpace + 1);
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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 + 1, uZRegSpace + 1);
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}
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if (edgeTable[iCubeIndex] & 128)
|
|
{
|
|
indlist[7] = pIndicesY(uXRegSpace, uYRegSpace, uZRegSpace + 1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 256)
|
|
{
|
|
indlist[8] = pIndicesZ(uXRegSpace, uYRegSpace, uZRegSpace);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 512)
|
|
{
|
|
indlist[9] = pIndicesZ(uXRegSpace + 1, uYRegSpace, uZRegSpace);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 1024)
|
|
{
|
|
indlist[10] = pIndicesZ(uXRegSpace + 1, uYRegSpace + 1, uZRegSpace);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 2048)
|
|
{
|
|
indlist[11] = pIndicesZ(uXRegSpace, uYRegSpace + 1, 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
|
|
}//For each cell
|
|
}
|
|
}
|
|
}
|