Added decimated mesh support to new surface extractor. Integrated with Thermite.
This commit is contained in:
David Williams
parent
c1737416a6
commit
3acd9e5553
@ -4,6 +4,7 @@
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#include "GradientEstimators.h"
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#include "SurfaceAdjusters.h"
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#include "SurfaceExtractor.h"
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//Some namespaces we need
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using namespace std;
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@ -37,6 +38,9 @@ void OpenGLWidget::setVolume(PolyVox::Volume<PolyVox::uint8_t>* volData)
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m_uVolumeHeightInRegions = volData->getHeight() / m_uRegionSideLength;
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m_uVolumeDepthInRegions = volData->getDepth() / m_uRegionSideLength;
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SurfaceExtractor surfaceExtractor(*volData);
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surfaceExtractor.setLodLevel(0);
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//Our volume is broken down into cuboid regions, and we create one mesh for each region.
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//This three-level for loop iterates over each region.
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for(PolyVox::uint16_t uRegionZ = 0; uRegionZ < m_uVolumeDepthInRegions; ++uRegionZ)
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@ -64,7 +68,8 @@ void OpenGLWidget::setVolume(PolyVox::Volume<PolyVox::uint8_t>* volData)
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Vector3DInt32 regUpperCorner(regionEndX, regionEndY, regionEndZ);
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//Extract the surface for this region
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extractSurface(m_volData, 0, PolyVox::Region(regLowerCorner, regUpperCorner), ispCurrent);
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//extractSurface(m_volData, 0, PolyVox::Region(regLowerCorner, regUpperCorner), ispCurrent);
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surfaceExtractor.extractSurfaceForRegion(PolyVox::Region(regLowerCorner, regUpperCorner), ispCurrent);
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//computeNormalsForVertices(m_volData, *ispCurrent, SOBEL_SMOOTHED);
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//*ispCurrent = getSmoothedSurface(*ispCurrent);
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@ -38,6 +38,7 @@ namespace PolyVox
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class IndexedSurfacePatch;
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class Region;
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class SurfaceVertex;
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class SurfaceExtractor;
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//---------- Vector ----------
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template <uint32_t Size, typename Type> class Vector;
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@ -51,10 +51,17 @@ namespace PolyVox
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uint32_t getIndex(uint32_t x, uint32_t y, uint32_t regionWidth);
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void extractFastSurfaceImpl(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch);
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uint32_t computeRoughBitmaskForSlice(VolumeIterator<uint8_t>& volIter, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask);
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void generateRoughIndicesForSlice(VolumeIterator<uint8_t>& volIter, const Region& regSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t* bitmask0, uint8_t* bitmask1, int32_t vertexIndicesX0[],int32_t vertexIndicesY0[],int32_t vertexIndicesZ0[], int32_t vertexIndicesX1[],int32_t vertexIndicesY1[],int32_t vertexIndicesZ1[]);
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void generateRoughVerticesForSlice(VolumeIterator<uint8_t>& volIter, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[]);
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void extractSurfaceForRegionLevel0(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch);
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uint32_t computeBitmaskForSliceLevel0(VolumeIterator<uint8_t>& volIter, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask);
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void generateIndicesForSliceLevel0(VolumeIterator<uint8_t>& volIter, const Region& regSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t* bitmask0, uint8_t* bitmask1, int32_t vertexIndicesX0[],int32_t vertexIndicesY0[],int32_t vertexIndicesZ0[], int32_t vertexIndicesX1[],int32_t vertexIndicesY1[],int32_t vertexIndicesZ1[]);
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void generateVerticesForSliceLevel0(VolumeIterator<uint8_t>& volIter, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[]);
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uint32_t getDecimatedIndex(uint32_t x, uint32_t y, uint32_t regionWidth);
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void extractDecimatedSurfaceImpl(Volume<uint8_t>* volumeData, uint8_t uLevel, Region region, IndexedSurfacePatch* singleMaterialPatch);
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uint32_t computeDecimatedBitmaskForSlice(VolumeIterator<uint8_t>& volIter, uint8_t uLevel, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask);
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void generateDecimatedIndicesForSlice(VolumeIterator<uint8_t>& volIter, uint8_t uLevel, const Region& regSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t* bitmask0, uint8_t* bitmask1, int32_t vertexIndicesX0[],int32_t vertexIndicesY0[],int32_t vertexIndicesZ0[], int32_t vertexIndicesX1[],int32_t vertexIndicesY1[],int32_t vertexIndicesZ1[]);
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void generateDecimatedVerticesForSlice(VolumeIterator<uint8_t>& volIter, uint8_t uLevel, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[]);
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};
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}
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@ -25,12 +25,27 @@ namespace PolyVox
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void SurfaceExtractor::extractSurfaceForRegion(Region region, IndexedSurfacePatch* singleMaterialPatch)
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{
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extractFastSurfaceImpl(&m_volData, region, singleMaterialPatch);
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if(m_uLodLevel == 0)
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{
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extractSurfaceForRegionLevel0(&m_volData, region, singleMaterialPatch);
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}
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else
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{
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extractDecimatedSurfaceImpl(&m_volData, m_uLodLevel, region, singleMaterialPatch);
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}
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singleMaterialPatch->m_v3dRegionPosition = region.getLowerCorner();
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}
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void SurfaceExtractor::extractFastSurfaceImpl(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch)
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uint32_t SurfaceExtractor::getIndex(uint32_t x, uint32_t y, uint32_t regionWidth)
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{
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return x + (y * (regionWidth+1));
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}
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////////////////////////////////////////////////////////////////////////////////
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// Level 0
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////////////////////////////////////////////////////////////////////////////////
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void SurfaceExtractor::extractSurfaceForRegionLevel0(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch)
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{
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singleMaterialPatch->clear();
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@ -63,11 +78,11 @@ namespace PolyVox
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VolumeIterator<uint8_t> volIter(*volumeData);
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//Compute bitmask for initial slice
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uint32_t uNoOfNonEmptyCellsForSlice0 = computeRoughBitmaskForSlice(volIter, regSlice0, offset, bitmask0, 0);
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uint32_t uNoOfNonEmptyCellsForSlice0 = computeBitmaskForSliceLevel0(volIter, regSlice0, offset, bitmask0, 0);
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if(uNoOfNonEmptyCellsForSlice0 != 0)
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{
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//If there were some non-empty cells then generate initial slice vertices for them
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generateRoughVerticesForSlice(volIter,regSlice0, offset, bitmask0, singleMaterialPatch, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0);
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generateVerticesForSliceLevel0(volIter,regSlice0, offset, bitmask0, singleMaterialPatch, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0);
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}
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for(uint32_t uSlice = 0; ((uSlice < region.depth()) && (uSlice + offset.getZ() < region.getUpperCorner().getZ())); ++uSlice)
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@ -75,16 +90,16 @@ namespace PolyVox
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Region regSlice1(regSlice0);
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regSlice1.shift(Vector3DInt32(0,0,1));
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uint32_t uNoOfNonEmptyCellsForSlice1 = computeRoughBitmaskForSlice(volIter, regSlice1, offset, bitmask1, bitmask0);
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uint32_t uNoOfNonEmptyCellsForSlice1 = computeBitmaskForSliceLevel0(volIter, regSlice1, offset, bitmask1, bitmask0);
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if(uNoOfNonEmptyCellsForSlice1 != 0)
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{
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generateRoughVerticesForSlice(volIter,regSlice1, offset, bitmask1, singleMaterialPatch, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
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generateVerticesForSliceLevel0(volIter,regSlice1, offset, bitmask1, singleMaterialPatch, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
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}
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if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0))
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{
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generateRoughIndicesForSlice(volIter, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
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generateIndicesForSliceLevel0(volIter, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
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}
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std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1);
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@ -106,12 +121,7 @@ namespace PolyVox
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delete[] vertexIndicesZ1;
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}
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uint32_t SurfaceExtractor::getIndex(uint32_t x, uint32_t y, uint32_t regionWidth)
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{
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return x + (y * (regionWidth+1));
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}
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uint32_t SurfaceExtractor::computeRoughBitmaskForSlice(VolumeIterator<uint8_t>& volIter, const Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, uint8_t* previousBitmask)
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uint32_t SurfaceExtractor::computeBitmaskForSliceLevel0(VolumeIterator<uint8_t>& volIter, const Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, uint8_t* previousBitmask)
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{
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uint32_t uNoOfNonEmptyCells = 0;
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@ -349,7 +359,7 @@ namespace PolyVox
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return uNoOfNonEmptyCells;
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}
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void SurfaceExtractor::generateRoughVerticesForSlice(VolumeIterator<uint8_t>& volIter, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[])
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void SurfaceExtractor::generateVerticesForSliceLevel0(VolumeIterator<uint8_t>& volIter, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[])
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{
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//Iterate over each cell in the region
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for(uint16_t uYVolSpace = regSlice.getLowerCorner().getY(); uYVolSpace <= regSlice.getUpperCorner().getY(); uYVolSpace++)
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@ -424,7 +434,7 @@ namespace PolyVox
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}
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}
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void SurfaceExtractor::generateRoughIndicesForSlice(VolumeIterator<uint8_t>& volIter, const Region& regSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t* bitmask0, uint8_t* bitmask1, int32_t vertexIndicesX0[],int32_t vertexIndicesY0[],int32_t vertexIndicesZ0[], int32_t vertexIndicesX1[],int32_t vertexIndicesY1[],int32_t vertexIndicesZ1[])
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void SurfaceExtractor::generateIndicesForSliceLevel0(VolumeIterator<uint8_t>& volIter, const Region& regSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t* bitmask0, uint8_t* bitmask1, int32_t vertexIndicesX0[],int32_t vertexIndicesY0[],int32_t vertexIndicesZ0[], int32_t vertexIndicesX1[],int32_t vertexIndicesY1[],int32_t vertexIndicesZ1[])
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{
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uint32_t indlist[12];
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@ -535,4 +545,514 @@ namespace PolyVox
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Level 1
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////////////////////////////////////////////////////////////////////////////////
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uint32_t SurfaceExtractor::getDecimatedIndex(uint32_t x, uint32_t y , uint32_t regionWidth)
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{
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return x + (y * (regionWidth+1));
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}
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void SurfaceExtractor::extractDecimatedSurfaceImpl(Volume<uint8_t>* volumeData, uint8_t uLevel, Region region, IndexedSurfacePatch* singleMaterialPatch)
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{
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singleMaterialPatch->clear();
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//For edge indices
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//FIXME - do the slices need to be this big? Surely for a decimated mesh they can be smaller?
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//FIXME - Instead of region.width()+2 we used to use POLYVOX_REGION_SIDE_LENGTH+1
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//Normally POLYVOX_REGION_SIDE_LENGTH is the same as region.width() (often 32) but at the
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//edges of the volume it is 1 smaller. Need to think what values really belong here.
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int32_t* vertexIndicesX0 = new int32_t[(region.width()+2) * (region.height()+2)];
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int32_t* vertexIndicesY0 = new int32_t[(region.width()+2) * (region.height()+2)];
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int32_t* vertexIndicesZ0 = new int32_t[(region.width()+2) * (region.height()+2)];
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int32_t* vertexIndicesX1 = new int32_t[(region.width()+2) * (region.height()+2)];
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int32_t* vertexIndicesY1 = new int32_t[(region.width()+2) * (region.height()+2)];
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int32_t* vertexIndicesZ1 = new int32_t[(region.width()+2) * (region.height()+2)];
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//Cell bitmasks
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uint8_t* bitmask0 = new uint8_t[(region.width()+2) * (region.height()+2)];
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uint8_t* bitmask1 = new uint8_t[(region.width()+2) * (region.height()+2)];
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const uint8_t uStepSize = uLevel == 0 ? 1 : 1 << uLevel;
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//When generating the mesh for a region we actually look outside it in the
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// back, bottom, right direction. Protect against access violations by cropping region here
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Region regVolume = volumeData->getEnclosingRegion();
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regVolume.setUpperCorner(regVolume.getUpperCorner() - Vector3DInt32(2*uStepSize-1,2*uStepSize-1,2*uStepSize-1));
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region.cropTo(regVolume);
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//Offset from volume corner
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const Vector3DFloat offset = static_cast<Vector3DFloat>(region.getLowerCorner());
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//Create a region corresponding to the first slice
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Region regSlice0(region);
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Vector3DInt32 v3dUpperCorner = regSlice0.getUpperCorner();
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v3dUpperCorner.setZ(regSlice0.getLowerCorner().getZ()); //Set the upper z to the lower z to make it one slice thick.
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regSlice0.setUpperCorner(v3dUpperCorner);
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//Iterator to access the volume data
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VolumeIterator<uint8_t> volIter(*volumeData);
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//Compute bitmask for initial slice
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uint32_t uNoOfNonEmptyCellsForSlice0 = computeDecimatedBitmaskForSlice(volIter, uLevel, regSlice0, offset, bitmask0, 0);
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if(uNoOfNonEmptyCellsForSlice0 != 0)
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{
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//If there were some non-empty cells then generate initial slice vertices for them
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generateDecimatedVerticesForSlice(volIter, uLevel, regSlice0, offset, bitmask0, singleMaterialPatch, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0);
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}
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for(uint32_t uSlice = 1; ((uSlice <= region.depth()) && (uSlice + offset.getZ() <= regVolume.getUpperCorner().getZ())); uSlice += uStepSize)
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{
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Region regSlice1(regSlice0);
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regSlice1.shift(Vector3DInt32(0,0,uStepSize));
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uint32_t uNoOfNonEmptyCellsForSlice1 = computeDecimatedBitmaskForSlice(volIter, uLevel, regSlice1, offset, bitmask1, bitmask0);
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if(uNoOfNonEmptyCellsForSlice1 != 0)
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{
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generateDecimatedVerticesForSlice(volIter, uLevel, regSlice1, offset, bitmask1, singleMaterialPatch, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
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}
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if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0))
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{
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generateDecimatedIndicesForSlice(volIter, uLevel, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
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}
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std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1);
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std::swap(bitmask0, bitmask1);
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std::swap(vertexIndicesX0, vertexIndicesX1);
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std::swap(vertexIndicesY0, vertexIndicesY1);
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std::swap(vertexIndicesZ0, vertexIndicesZ1);
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regSlice0 = regSlice1;
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}
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delete[] bitmask0;
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delete[] bitmask1;
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delete[] vertexIndicesX0;
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delete[] vertexIndicesX1;
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delete[] vertexIndicesY0;
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delete[] vertexIndicesY1;
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delete[] vertexIndicesZ0;
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delete[] vertexIndicesZ1;
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/*std::vector<SurfaceVertex>::iterator iterSurfaceVertex = singleMaterialPatch->getVertices().begin();
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while(iterSurfaceVertex != singleMaterialPatch->getVertices().end())
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{
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Vector3DFloat tempNormal = computeDecimatedNormal(volumeData, static_cast<Vector3DFloat>(iterSurfaceVertex->getPosition() + offset), CENTRAL_DIFFERENCE);
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const_cast<SurfaceVertex&>(*iterSurfaceVertex).setNormal(tempNormal);
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++iterSurfaceVertex;
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}*/
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}
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uint32_t SurfaceExtractor::computeDecimatedBitmaskForSlice(VolumeIterator<uint8_t>& volIter, uint8_t uLevel, const Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, uint8_t* previousBitmask)
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{
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const uint8_t uStepSize = uLevel == 0 ? 1 : 1 << uLevel;
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uint32_t uNoOfNonEmptyCells = 0;
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//Iterate over each cell in the region
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for(uint16_t uYVolSpace = regSlice.getLowerCorner().getY(); uYVolSpace <= regSlice.getUpperCorner().getY(); uYVolSpace += uStepSize)
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{
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for(uint16_t uXVolSpace = regSlice.getLowerCorner().getX(); uXVolSpace <= regSlice.getUpperCorner().getX(); uXVolSpace += uStepSize)
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{
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uint16_t uZVolSpace = regSlice.getLowerCorner().getZ();
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//Current position
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volIter.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
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const uint16_t uXRegSpace = volIter.getPosX() - offset.getX();
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const uint16_t uYRegSpace = volIter.getPosY() - offset.getY();
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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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uint8_t iCubeIndex = 0;
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bool isPrevXAvail = uXRegSpace > 0;
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bool isPrevYAvail = uYRegSpace > 0;
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bool isPrevZAvail = previousBitmask != 0;
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if(isPrevZAvail)
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{
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if(isPrevYAvail)
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{
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if(isPrevXAvail)
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{
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volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
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const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
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//z
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uint8_t iPreviousCubeIndexZ = previousBitmask[getDecimatedIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
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iPreviousCubeIndexZ >>= 4;
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//y
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uint8_t iPreviousCubeIndexY = bitmask[getDecimatedIndex(uXRegSpace,uYRegSpace-uStepSize, regSlice.width()+1)];
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iPreviousCubeIndexY &= 192; //192 = 128 + 64
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iPreviousCubeIndexY >>= 2;
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//x
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uint8_t iPreviousCubeIndexX = bitmask[getDecimatedIndex(uXRegSpace-uStepSize,uYRegSpace, regSlice.width()+1)];
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iPreviousCubeIndexX &= 128;
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iPreviousCubeIndexX >>= 1;
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iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexY | iPreviousCubeIndexZ;
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if (v111 == 0) iCubeIndex |= 128;
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}
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else //previous X not available
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{
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volIter.setPosition(uXVolSpace,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
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const uint8_t v011 = volIter.getSubSampledVoxel(uLevel);
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volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
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const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
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//z
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uint8_t iPreviousCubeIndexZ = previousBitmask[getDecimatedIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
|
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iPreviousCubeIndexZ >>= 4;
|
||||
|
||||
//y
|
||||
uint8_t iPreviousCubeIndexY = bitmask[getDecimatedIndex(uXRegSpace,uYRegSpace-uStepSize, regSlice.width()+1)];
|
||||
iPreviousCubeIndexY &= 192; //192 = 128 + 64
|
||||
iPreviousCubeIndexY >>= 2;
|
||||
|
||||
iCubeIndex = iPreviousCubeIndexY | iPreviousCubeIndexZ;
|
||||
|
||||
if (v011 == 0) iCubeIndex |= 64;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
}
|
||||
else //previous Y not available
|
||||
{
|
||||
if(isPrevXAvail)
|
||||
{
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace,uZVolSpace+uStepSize);
|
||||
const uint8_t v101 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
//z
|
||||
uint8_t iPreviousCubeIndexZ = previousBitmask[getDecimatedIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
|
||||
iPreviousCubeIndexZ >>= 4;
|
||||
|
||||
//x
|
||||
uint8_t iPreviousCubeIndexX = bitmask[getDecimatedIndex(uXRegSpace-uStepSize,uYRegSpace, regSlice.width()+1)];
|
||||
iPreviousCubeIndexX &= 160; //160 = 128+32
|
||||
iPreviousCubeIndexX >>= 1;
|
||||
|
||||
iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexZ;
|
||||
|
||||
if (v101 == 0) iCubeIndex |= 32;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
else //previous X not available
|
||||
{
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace,uZVolSpace+uStepSize);
|
||||
const uint8_t v001 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace,uZVolSpace+uStepSize);
|
||||
const uint8_t v101 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v011 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
//z
|
||||
uint8_t iPreviousCubeIndexZ = previousBitmask[getDecimatedIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
|
||||
iCubeIndex = iPreviousCubeIndexZ >> 4;
|
||||
|
||||
if (v001 == 0) iCubeIndex |= 16;
|
||||
if (v101 == 0) iCubeIndex |= 32;
|
||||
if (v011 == 0) iCubeIndex |= 64;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
}
|
||||
}
|
||||
else //previous Z not available
|
||||
{
|
||||
if(isPrevYAvail)
|
||||
{
|
||||
if(isPrevXAvail)
|
||||
{
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace);
|
||||
const uint8_t v110 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
//y
|
||||
uint8_t iPreviousCubeIndexY = bitmask[getDecimatedIndex(uXRegSpace,uYRegSpace-uStepSize, regSlice.width()+1)];
|
||||
iPreviousCubeIndexY &= 204; //204 = 128+64+8+4
|
||||
iPreviousCubeIndexY >>= 2;
|
||||
|
||||
//x
|
||||
uint8_t iPreviousCubeIndexX = bitmask[getDecimatedIndex(uXRegSpace-uStepSize,uYRegSpace, regSlice.width()+1)];
|
||||
iPreviousCubeIndexX &= 170; //170 = 128+32+8+2
|
||||
iPreviousCubeIndexX >>= 1;
|
||||
|
||||
iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexY;
|
||||
|
||||
if (v110 == 0) iCubeIndex |= 8;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
else //previous X not available
|
||||
{
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace+uStepSize,uZVolSpace);
|
||||
const uint8_t v010 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace);
|
||||
const uint8_t v110 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v011 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
//y
|
||||
uint8_t iPreviousCubeIndexY = bitmask[getDecimatedIndex(uXRegSpace,uYRegSpace-uStepSize, regSlice.width()+1)];
|
||||
iPreviousCubeIndexY &= 204; //204 = 128+64+8+4
|
||||
iPreviousCubeIndexY >>= 2;
|
||||
|
||||
iCubeIndex = iPreviousCubeIndexY;
|
||||
|
||||
if (v010 == 0) iCubeIndex |= 4;
|
||||
if (v110 == 0) iCubeIndex |= 8;
|
||||
if (v011 == 0) iCubeIndex |= 64;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
}
|
||||
else //previous Y not available
|
||||
{
|
||||
if(isPrevXAvail)
|
||||
{
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace,uZVolSpace);
|
||||
const uint8_t v100 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace);
|
||||
const uint8_t v110 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace,uZVolSpace+uStepSize);
|
||||
const uint8_t v101 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
//x
|
||||
uint8_t iPreviousCubeIndexX = bitmask[getDecimatedIndex(uXRegSpace-uStepSize,uYRegSpace, regSlice.width()+1)];
|
||||
iPreviousCubeIndexX &= 170; //170 = 128+32+8+2
|
||||
iPreviousCubeIndexX >>= 1;
|
||||
|
||||
iCubeIndex = iPreviousCubeIndexX;
|
||||
|
||||
if (v100 == 0) iCubeIndex |= 2;
|
||||
if (v110 == 0) iCubeIndex |= 8;
|
||||
if (v101 == 0) iCubeIndex |= 32;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
else //previous X not available
|
||||
{
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
|
||||
const uint8_t v000 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace,uZVolSpace);
|
||||
const uint8_t v100 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace+uStepSize,uZVolSpace);
|
||||
const uint8_t v010 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace);
|
||||
const uint8_t v110 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace,uZVolSpace+uStepSize);
|
||||
const uint8_t v001 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace,uZVolSpace+uStepSize);
|
||||
const uint8_t v101 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v011 = volIter.getSubSampledVoxel(uLevel);
|
||||
volIter.setPosition(uXVolSpace+uStepSize,uYVolSpace+uStepSize,uZVolSpace+uStepSize);
|
||||
const uint8_t v111 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
if (v000 == 0) iCubeIndex |= 1;
|
||||
if (v100 == 0) iCubeIndex |= 2;
|
||||
if (v010 == 0) iCubeIndex |= 4;
|
||||
if (v110 == 0) iCubeIndex |= 8;
|
||||
if (v001 == 0) iCubeIndex |= 16;
|
||||
if (v101 == 0) iCubeIndex |= 32;
|
||||
if (v011 == 0) iCubeIndex |= 64;
|
||||
if (v111 == 0) iCubeIndex |= 128;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
//Save the bitmask
|
||||
bitmask[getDecimatedIndex(uXRegSpace,uYVolSpace- offset.getY(), regSlice.width()+1)] = iCubeIndex;
|
||||
|
||||
if(edgeTable[iCubeIndex] != 0)
|
||||
{
|
||||
++uNoOfNonEmptyCells;
|
||||
}
|
||||
|
||||
}//For each cell
|
||||
}
|
||||
|
||||
return uNoOfNonEmptyCells;
|
||||
}
|
||||
|
||||
void SurfaceExtractor::generateDecimatedVerticesForSlice(VolumeIterator<uint8_t>& volIter, uint8_t uLevel, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[])
|
||||
{
|
||||
const uint8_t uStepSize = uLevel == 0 ? 1 : 1 << uLevel;
|
||||
|
||||
//Iterate over each cell in the region
|
||||
for(uint16_t y = regSlice.getLowerCorner().getY(); y <= regSlice.getUpperCorner().getY(); y += uStepSize)
|
||||
{
|
||||
for(uint16_t x = regSlice.getLowerCorner().getX(); x <= regSlice.getUpperCorner().getX(); x += uStepSize)
|
||||
{
|
||||
//Current position
|
||||
const uint16_t z = regSlice.getLowerCorner().getZ();
|
||||
|
||||
volIter.setPosition(x,y,z);
|
||||
const uint8_t v000 = volIter.getSubSampledVoxel(uLevel);
|
||||
|
||||
//Determine the index into the edge table which tells us which vertices are inside of the surface
|
||||
uint8_t iCubeIndex = bitmask[getDecimatedIndex(x - offset.getX(),y - offset.getY(), regSlice.width()+1)];
|
||||
|
||||
/* Cube is entirely in/out of the surface */
|
||||
if (edgeTable[iCubeIndex] == 0)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Find the vertices where the surface intersects the cube */
|
||||
if (edgeTable[iCubeIndex] & 1)
|
||||
{
|
||||
if(x != regSlice.getUpperCorner().getX())
|
||||
{
|
||||
volIter.setPosition(x + uStepSize,y,z);
|
||||
const uint8_t v100 = volIter.getSubSampledVoxel(uLevel);
|
||||
const Vector3DFloat v3dPosition(x - offset.getX() + 0.5f * uStepSize, y - offset.getY(), z - offset.getZ());
|
||||
const Vector3DFloat v3dNormal(v000 > v100 ? 1.0f : -1.0f,0.0,0.0);
|
||||
const uint8_t uMaterial = v000 | v100; //Because one of these is 0, the or operation takes the max.
|
||||
SurfaceVertex surfaceVertex(v3dPosition, v3dNormal, uMaterial);
|
||||
uint32_t uLastVertexIndex = singleMaterialPatch->addVertex(surfaceVertex);
|
||||
vertexIndicesX[getDecimatedIndex(x - offset.getX(),y - offset.getY(), regSlice.width()+1)] = uLastVertexIndex;
|
||||
}
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 8)
|
||||
{
|
||||
if(y != regSlice.getUpperCorner().getY())
|
||||
{
|
||||
volIter.setPosition(x,y + uStepSize,z);
|
||||
const uint8_t v010 = volIter.getSubSampledVoxel(uLevel);
|
||||
const Vector3DFloat v3dPosition(x - offset.getX(), y - offset.getY() + 0.5f * uStepSize, z - offset.getZ());
|
||||
const Vector3DFloat v3dNormal(0.0,v000 > v010 ? 1.0f : -1.0f,0.0);
|
||||
const uint8_t uMaterial = v000 | v010; //Because one of these is 0, the or operation takes the max.
|
||||
SurfaceVertex surfaceVertex(v3dPosition, v3dNormal, uMaterial);
|
||||
uint32_t uLastVertexIndex = singleMaterialPatch->addVertex(surfaceVertex);
|
||||
vertexIndicesY[getDecimatedIndex(x - offset.getX(),y - offset.getY(), regSlice.width()+1)] = uLastVertexIndex;
|
||||
}
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 256)
|
||||
{
|
||||
//if(z != regSlice.getUpperCorner.getZ())
|
||||
{
|
||||
volIter.setPosition(x,y,z + uStepSize);
|
||||
const uint8_t v001 = volIter.getSubSampledVoxel(uLevel);
|
||||
const Vector3DFloat v3dPosition(x - offset.getX(), y - offset.getY(), z - offset.getZ() + 0.5f * uStepSize);
|
||||
const Vector3DFloat v3dNormal(0.0,0.0,v000 > v001 ? 1.0f : -1.0f);
|
||||
const uint8_t uMaterial = v000 | v001; //Because one of these is 0, the or operation takes the max.
|
||||
const SurfaceVertex surfaceVertex(v3dPosition, v3dNormal, uMaterial);
|
||||
uint32_t uLastVertexIndex = singleMaterialPatch->addVertex(surfaceVertex);
|
||||
vertexIndicesZ[getDecimatedIndex(x - offset.getX(),y - offset.getY(), regSlice.width()+1)] = uLastVertexIndex;
|
||||
}
|
||||
}
|
||||
}//For each cell
|
||||
}
|
||||
}
|
||||
|
||||
void SurfaceExtractor::generateDecimatedIndicesForSlice(VolumeIterator<uint8_t>& volIter, uint8_t uLevel, const Region& regSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t* bitmask0, uint8_t* bitmask1, int32_t vertexIndicesX0[],int32_t vertexIndicesY0[],int32_t vertexIndicesZ0[], int32_t vertexIndicesX1[],int32_t vertexIndicesY1[],int32_t vertexIndicesZ1[])
|
||||
{
|
||||
const uint8_t uStepSize = uLevel == 0 ? 1 : 1 << uLevel;
|
||||
uint32_t indlist[12];
|
||||
|
||||
for(uint16_t y = regSlice.getLowerCorner().getY() - offset.getY(); y < regSlice.getUpperCorner().getY() - offset.getY(); y += uStepSize)
|
||||
{
|
||||
for(uint16_t x = regSlice.getLowerCorner().getX() - offset.getX(); x < regSlice.getUpperCorner().getX() - offset.getX(); x += uStepSize)
|
||||
{
|
||||
//Current position
|
||||
const uint16_t z = regSlice.getLowerCorner().getZ() - offset.getZ();
|
||||
|
||||
//Determine the index into the edge table which tells us which vertices are inside of the surface
|
||||
uint8_t iCubeIndex = bitmask0[getDecimatedIndex(x,y, regSlice.width()+1)];
|
||||
|
||||
/* Cube is entirely in/out of the surface */
|
||||
if (edgeTable[iCubeIndex] == 0)
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
/* Find the vertices where the surface intersects the cube */
|
||||
if (edgeTable[iCubeIndex] & 1)
|
||||
{
|
||||
indlist[0] = vertexIndicesX0[getDecimatedIndex(x,y, regSlice.width()+1)];
|
||||
assert(indlist[0] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 2)
|
||||
{
|
||||
indlist[1] = vertexIndicesY0[getDecimatedIndex(x+uStepSize,y, regSlice.width()+1)];
|
||||
assert(indlist[1] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 4)
|
||||
{
|
||||
indlist[2] = vertexIndicesX0[getDecimatedIndex(x,y+uStepSize, regSlice.width()+1)];
|
||||
assert(indlist[2] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 8)
|
||||
{
|
||||
indlist[3] = vertexIndicesY0[getDecimatedIndex(x,y, regSlice.width()+1)];
|
||||
assert(indlist[3] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 16)
|
||||
{
|
||||
indlist[4] = vertexIndicesX1[getDecimatedIndex(x,y, regSlice.width()+1)];
|
||||
assert(indlist[4] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 32)
|
||||
{
|
||||
indlist[5] = vertexIndicesY1[getDecimatedIndex(x+uStepSize,y, regSlice.width()+1)];
|
||||
assert(indlist[5] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 64)
|
||||
{
|
||||
indlist[6] = vertexIndicesX1[getDecimatedIndex(x,y+uStepSize, regSlice.width()+1)];
|
||||
assert(indlist[6] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 128)
|
||||
{
|
||||
indlist[7] = vertexIndicesY1[getDecimatedIndex(x,y, regSlice.width()+1)];
|
||||
assert(indlist[7] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 256)
|
||||
{
|
||||
indlist[8] = vertexIndicesZ0[getDecimatedIndex(x,y, regSlice.width()+1)];
|
||||
assert(indlist[8] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 512)
|
||||
{
|
||||
indlist[9] = vertexIndicesZ0[getDecimatedIndex(x+uStepSize,y, regSlice.width()+1)];
|
||||
assert(indlist[9] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 1024)
|
||||
{
|
||||
indlist[10] = vertexIndicesZ0[getDecimatedIndex(x+uStepSize,y+uStepSize, regSlice.width()+1)];
|
||||
assert(indlist[10] != -1);
|
||||
}
|
||||
if (edgeTable[iCubeIndex] & 2048)
|
||||
{
|
||||
indlist[11] = vertexIndicesZ0[getDecimatedIndex(x,y+uStepSize, regSlice.width()+1)];
|
||||
assert(indlist[11] != -1);
|
||||
}
|
||||
|
||||
for (int i=0;triTable[iCubeIndex][i]!=-1;i+=3)
|
||||
{
|
||||
uint32_t ind0 = indlist[triTable[iCubeIndex][i ]];
|
||||
uint32_t ind1 = indlist[triTable[iCubeIndex][i+1]];
|
||||
uint32_t ind2 = indlist[triTable[iCubeIndex][i+2]];
|
||||
|
||||
singleMaterialPatch->addTriangle(ind0, ind1, ind2);
|
||||
}//For each triangle
|
||||
}//For each cell
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user