676 lines
25 KiB
C++
676 lines
25 KiB
C++
#include "SurfaceExtractor.h"
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#include "IndexedSurfacePatch.h"
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#include "PolyVoxImpl/MarchingCubesTables.h"
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#include "SurfaceVertex.h"
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namespace PolyVox
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{
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SurfaceExtractor::SurfaceExtractor(Volume<uint8_t>& volData)
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:m_uLodLevel(0)
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,m_volData(volData)
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,m_sampVolume(volData)
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{
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}
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uint8_t SurfaceExtractor::getLodLevel(void)
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{
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return m_uLodLevel;
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}
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void SurfaceExtractor::setLodLevel(uint8_t uLodLevel)
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{
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m_uLodLevel = uLodLevel;
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//Step size is 2^uLodLevel
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m_uStepSize = 1 << uLodLevel;
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}
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POLYVOX_SHARED_PTR<IndexedSurfacePatch> SurfaceExtractor::extractSurfaceForRegion(Region region)
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{
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//POLYVOX_SHARED_PTR<IndexedSurfacePatch> result(new IndexedSurfacePatch());
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m_ispCurrent = new IndexedSurfacePatch();
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extractSurfaceImpl(region);
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m_ispCurrent->m_Region = region;
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return POLYVOX_SHARED_PTR<IndexedSurfacePatch>(m_ispCurrent);
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}
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void SurfaceExtractor::extractSurfaceImpl(Region region)
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{
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m_ispCurrent->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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m_pPreviousVertexIndicesX = new int32_t[(region.width()+8) * (region.height()+8)];
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m_pPreviousVertexIndicesY = new int32_t[(region.width()+8) * (region.height()+8)];
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m_pPreviousVertexIndicesZ = new int32_t[(region.width()+8) * (region.height()+8)];
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m_pCurrentVertexIndicesX = new int32_t[(region.width()+8) * (region.height()+8)];
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m_pCurrentVertexIndicesY = new int32_t[(region.width()+8) * (region.height()+8)];
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m_pCurrentVertexIndicesZ = new int32_t[(region.width()+8) * (region.height()+8)];
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//Cell bitmasks
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m_pPreviousBitmask = new uint8_t[(region.width()+8) * (region.height()+8)];
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m_pCurrentBitmask = new uint8_t[(region.width()+8) * (region.height()+8)];
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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 = m_volData.getEnclosingRegion();
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regVolume.setUpperCorner(regVolume.getUpperCorner() - Vector3DInt32(2*m_uStepSize-1,2*m_uStepSize-1,2*m_uStepSize-1));
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region.cropTo(regVolume);
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//m_v3dRegionOffset from volume corner
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m_v3dRegionOffset = static_cast<Vector3DFloat>(region.getLowerCorner());
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//Create a region corresponding to the first slice
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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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regSlice1 = regSlice0;
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m_uRegionWidth = region.width();
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uint32_t uNoOfNonEmptyCellsForSlice0 = 0;
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uint32_t uNoOfNonEmptyCellsForSlice1 = 0;
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bool isFirstSliceDone = false;
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for(uint32_t uSlice = 0; ((uSlice <= region.depth()) && (uSlice + m_v3dRegionOffset.getZ() <= regVolume.getUpperCorner().getZ())); uSlice += m_uStepSize)
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{
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computeBitmaskForSlice(!isFirstSliceDone);
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uNoOfNonEmptyCellsForSlice1 = m_uNoOfOccupiedCells;
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if(uNoOfNonEmptyCellsForSlice1 != 0)
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{
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generateVerticesForSlice();
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}
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if(isFirstSliceDone)
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{
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if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0))
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{
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generateIndicesForSlice();
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}
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}
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std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1);
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std::swap(m_pPreviousBitmask, m_pCurrentBitmask);
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std::swap(m_pPreviousVertexIndicesX, m_pCurrentVertexIndicesX);
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std::swap(m_pPreviousVertexIndicesY, m_pCurrentVertexIndicesY);
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std::swap(m_pPreviousVertexIndicesZ, m_pCurrentVertexIndicesZ);
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regSlice0 = regSlice1;
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regSlice1.shift(Vector3DInt32(0,0,m_uStepSize));
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isFirstSliceDone = true;
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}
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delete[] m_pPreviousBitmask;
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delete[] m_pCurrentBitmask;
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delete[] m_pPreviousVertexIndicesX;
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delete[] m_pCurrentVertexIndicesX;
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delete[] m_pPreviousVertexIndicesY;
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delete[] m_pCurrentVertexIndicesY;
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delete[] m_pPreviousVertexIndicesZ;
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delete[] m_pCurrentVertexIndicesZ;
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}
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uint32_t SurfaceExtractor::computeBitmaskForSlice(bool bIsFirstSlice)
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{
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m_uNoOfOccupiedCells = 0;
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const uint16_t uMaxXVolSpace = regSlice1.getUpperCorner().getX();
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const uint16_t uMaxYVolSpace = regSlice1.getUpperCorner().getY();
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uZVolSpace = regSlice1.getLowerCorner().getZ();
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uZRegSpace = uZVolSpace - m_v3dRegionOffset.getZ();
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//Iterate over each cell in the region
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/*for(*/uYVolSpace = regSlice1.getLowerCorner().getY();/* uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)*/
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{
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/*for(*/uXVolSpace = regSlice1.getLowerCorner().getX();/* uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)*/
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{
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uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
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uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
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//Current position
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
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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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computeBitmaskForCell(false, false, !bIsFirstSlice, m_uLodLevel);
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}//For each cell
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}
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//Iterate over each cell in the region
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for(uYVolSpace = regSlice1.getLowerCorner().getY() + m_uStepSize; uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)
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{
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/*for(*/uXVolSpace = regSlice1.getLowerCorner().getX();/* uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)*/
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{
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uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
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uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
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//Current position
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
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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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computeBitmaskForCell(false, true, !bIsFirstSlice, m_uLodLevel);
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}//For each cell
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}
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//Iterate over each cell in the region
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/*for(*/uYVolSpace = regSlice1.getLowerCorner().getY();/* uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)*/
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{
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for(uXVolSpace = regSlice1.getLowerCorner().getX() + m_uStepSize; uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)
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{
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uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
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uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
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//Current position
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
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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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computeBitmaskForCell(true, false, !bIsFirstSlice, m_uLodLevel);
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}//For each cell
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}
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//Iterate over each cell in the region
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for(uYVolSpace = regSlice1.getLowerCorner().getY() + m_uStepSize; uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)
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{
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for(uXVolSpace = regSlice1.getLowerCorner().getX() + m_uStepSize; uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)
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{
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uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
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uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
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//Current position
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
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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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computeBitmaskForCell(true, true, !bIsFirstSlice, m_uLodLevel);
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}//For each cell
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}
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return m_uNoOfOccupiedCells;
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}
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void SurfaceExtractor::computeBitmaskForCell(bool isPrevXAvail, bool isPrevYAvail, bool isPrevZAvail, uint8_t uLodLevel)
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{
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uint8_t iCubeIndex = 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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if(m_uLodLevel == 0)
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{
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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}
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//z
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uint8_t iPreviousCubeIndexZ = m_pPreviousBitmask[getIndex(uXRegSpace,uYRegSpace)];
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iPreviousCubeIndexZ >>= 4;
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//y
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uint8_t iPreviousCubeIndexY = m_pCurrentBitmask[getIndex(uXRegSpace,uYRegSpace-m_uStepSize)];
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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 = m_pCurrentBitmask[getIndex(uXRegSpace-m_uStepSize,uYRegSpace)];
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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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if(m_uLodLevel == 0)
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{
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v011 = m_sampVolume.peekVoxel0px1py1pz();
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v011 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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}
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//z
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uint8_t iPreviousCubeIndexZ = m_pPreviousBitmask[getIndex(uXRegSpace,uYRegSpace)];
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iPreviousCubeIndexZ >>= 4;
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//y
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uint8_t iPreviousCubeIndexY = m_pCurrentBitmask[getIndex(uXRegSpace,uYRegSpace-m_uStepSize)];
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iPreviousCubeIndexY &= 192; //192 = 128 + 64
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iPreviousCubeIndexY >>= 2;
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iCubeIndex = iPreviousCubeIndexY | iPreviousCubeIndexZ;
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if (v011 == 0) iCubeIndex |= 64;
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if (v111 == 0) iCubeIndex |= 128;
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}
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}
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else //previous Y not available
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{
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if(isPrevXAvail)
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{
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if(m_uLodLevel == 0)
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{
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v101 = m_sampVolume.peekVoxel1px0py1pz();
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace,uZVolSpace+m_uStepSize);
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v101 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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}
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//z
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uint8_t iPreviousCubeIndexZ = m_pPreviousBitmask[getIndex(uXRegSpace,uYRegSpace)];
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iPreviousCubeIndexZ >>= 4;
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//x
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uint8_t iPreviousCubeIndexX = m_pCurrentBitmask[getIndex(uXRegSpace-m_uStepSize,uYRegSpace)];
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iPreviousCubeIndexX &= 160; //160 = 128+32
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iPreviousCubeIndexX >>= 1;
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iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexZ;
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if (v101 == 0) iCubeIndex |= 32;
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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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if(m_uLodLevel == 0)
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{
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v001 = m_sampVolume.peekVoxel0px0py1pz();
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v101 = m_sampVolume.peekVoxel1px0py1pz();
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v011 = m_sampVolume.peekVoxel0px1py1pz();
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace+m_uStepSize);
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v001 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace,uZVolSpace+m_uStepSize);
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v101 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v011 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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}
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//z
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uint8_t iPreviousCubeIndexZ = m_pPreviousBitmask[getIndex(uXRegSpace,uYRegSpace)];
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iCubeIndex = iPreviousCubeIndexZ >> 4;
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if (v001 == 0) iCubeIndex |= 16;
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if (v101 == 0) iCubeIndex |= 32;
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if (v011 == 0) iCubeIndex |= 64;
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if (v111 == 0) iCubeIndex |= 128;
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}
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}
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}
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else //previous Z not available
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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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if(m_uLodLevel == 0)
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{
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v110 = m_sampVolume.peekVoxel1px1py0pz();
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace);
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v110 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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}
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//y
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uint8_t iPreviousCubeIndexY = m_pCurrentBitmask[getIndex(uXRegSpace,uYRegSpace-m_uStepSize)];
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iPreviousCubeIndexY &= 204; //204 = 128+64+8+4
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iPreviousCubeIndexY >>= 2;
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//x
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uint8_t iPreviousCubeIndexX = m_pCurrentBitmask[getIndex(uXRegSpace-m_uStepSize,uYRegSpace)];
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iPreviousCubeIndexX &= 170; //170 = 128+32+8+2
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iPreviousCubeIndexX >>= 1;
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iCubeIndex = iPreviousCubeIndexX | iPreviousCubeIndexY;
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if (v110 == 0) iCubeIndex |= 8;
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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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if(m_uLodLevel == 0)
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{
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v010 = m_sampVolume.peekVoxel0px1py0pz();
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v110 = m_sampVolume.peekVoxel1px1py0pz();
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v011 = m_sampVolume.peekVoxel0px1py1pz();
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace+m_uStepSize,uZVolSpace);
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v010 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace);
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v110 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v011 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
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v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
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}
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//y
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uint8_t iPreviousCubeIndexY = m_pCurrentBitmask[getIndex(uXRegSpace,uYRegSpace-m_uStepSize)];
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iPreviousCubeIndexY &= 204; //204 = 128+64+8+4
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iPreviousCubeIndexY >>= 2;
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iCubeIndex = iPreviousCubeIndexY;
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if (v010 == 0) iCubeIndex |= 4;
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if (v110 == 0) iCubeIndex |= 8;
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if (v011 == 0) iCubeIndex |= 64;
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if (v111 == 0) iCubeIndex |= 128;
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}
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}
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else //previous Y not available
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{
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if(isPrevXAvail)
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{
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if(m_uLodLevel == 0)
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{
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v100 = m_sampVolume.peekVoxel1px0py0pz();
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v110 = m_sampVolume.peekVoxel1px1py0pz();
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v101 = m_sampVolume.peekVoxel1px0py1pz();
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v111 = m_sampVolume.peekVoxel1px1py1pz();
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}
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else
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{
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m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace,uZVolSpace);
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|
v100 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace);
|
|
v110 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace,uZVolSpace+m_uStepSize);
|
|
v101 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
|
|
v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
}
|
|
|
|
//x
|
|
uint8_t iPreviousCubeIndexX = m_pCurrentBitmask[getIndex(uXRegSpace-m_uStepSize,uYRegSpace)];
|
|
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
|
|
{
|
|
if(m_uLodLevel == 0)
|
|
{
|
|
v000 = m_sampVolume.getVoxel();
|
|
v100 = m_sampVolume.peekVoxel1px0py0pz();
|
|
v010 = m_sampVolume.peekVoxel0px1py0pz();
|
|
v110 = m_sampVolume.peekVoxel1px1py0pz();
|
|
|
|
v001 = m_sampVolume.peekVoxel0px0py1pz();
|
|
v101 = m_sampVolume.peekVoxel1px0py1pz();
|
|
v011 = m_sampVolume.peekVoxel0px1py1pz();
|
|
v111 = m_sampVolume.peekVoxel1px1py1pz();
|
|
}
|
|
else
|
|
{
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
|
|
v000 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace,uZVolSpace);
|
|
v100 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace+m_uStepSize,uZVolSpace);
|
|
v010 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace);
|
|
v110 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace+m_uStepSize);
|
|
v001 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace,uZVolSpace+m_uStepSize);
|
|
v101 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
|
|
v011 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
m_sampVolume.setPosition(uXVolSpace+m_uStepSize,uYVolSpace+m_uStepSize,uZVolSpace+m_uStepSize);
|
|
v111 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
}
|
|
|
|
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
|
|
m_pCurrentBitmask[getIndex(uXRegSpace,uYVolSpace- m_v3dRegionOffset.getY())] = iCubeIndex;
|
|
|
|
if(edgeTable[iCubeIndex] != 0)
|
|
{
|
|
++m_uNoOfOccupiedCells;
|
|
}
|
|
}
|
|
|
|
void SurfaceExtractor::generateVerticesForSlice()
|
|
{
|
|
//Iterate over each cell in the region
|
|
for(uint16_t uYVolSpace = regSlice1.getLowerCorner().getY(); uYVolSpace <= regSlice1.getUpperCorner().getY(); uYVolSpace += m_uStepSize)
|
|
{
|
|
for(uint16_t uXVolSpace = regSlice1.getLowerCorner().getX(); uXVolSpace <= regSlice1.getUpperCorner().getX(); uXVolSpace += m_uStepSize)
|
|
{
|
|
uint16_t uZVolSpace = regSlice1.getLowerCorner().getZ();
|
|
|
|
//Current position
|
|
const uint16_t uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
|
|
const uint16_t uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
|
|
const uint16_t uZRegSpace = uZVolSpace - m_v3dRegionOffset.getZ();
|
|
|
|
//Current position
|
|
//const uint16_t z = regSlice.getLowerCorner().getZ();
|
|
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
|
|
const uint8_t v000 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
|
|
//Determine the index into the edge table which tells us which vertices are inside of the surface
|
|
uint8_t iCubeIndex = m_pCurrentBitmask[getIndex(uXVolSpace - m_v3dRegionOffset.getX(),uYVolSpace - m_v3dRegionOffset.getY())];
|
|
|
|
/* 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(uXVolSpace != regSlice1.getUpperCorner().getX())
|
|
{
|
|
m_sampVolume.setPosition(uXVolSpace + m_uStepSize,uYVolSpace,uZVolSpace);
|
|
const uint8_t v100 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
const Vector3DFloat v3dPosition(uXVolSpace - m_v3dRegionOffset.getX() + 0.5f * m_uStepSize, uYVolSpace - m_v3dRegionOffset.getY(), uZVolSpace - m_v3dRegionOffset.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 = m_ispCurrent->addVertex(surfaceVertex);
|
|
m_pCurrentVertexIndicesX[getIndex(uXVolSpace - m_v3dRegionOffset.getX(),uYVolSpace - m_v3dRegionOffset.getY())] = uLastVertexIndex;
|
|
}
|
|
}
|
|
if (edgeTable[iCubeIndex] & 8)
|
|
{
|
|
if(uYVolSpace != regSlice1.getUpperCorner().getY())
|
|
{
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace + m_uStepSize,uZVolSpace);
|
|
const uint8_t v010 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
const Vector3DFloat v3dPosition(uXVolSpace - m_v3dRegionOffset.getX(), uYVolSpace - m_v3dRegionOffset.getY() + 0.5f * m_uStepSize, uZVolSpace - m_v3dRegionOffset.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 = m_ispCurrent->addVertex(surfaceVertex);
|
|
m_pCurrentVertexIndicesY[getIndex(uXVolSpace - m_v3dRegionOffset.getX(),uYVolSpace - m_v3dRegionOffset.getY())] = uLastVertexIndex;
|
|
}
|
|
}
|
|
if (edgeTable[iCubeIndex] & 256)
|
|
{
|
|
//if(z != regSlice.getUpperCorner.getZ())
|
|
{
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace + m_uStepSize);
|
|
const uint8_t v001 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
|
|
const Vector3DFloat v3dPosition(uXVolSpace - m_v3dRegionOffset.getX(), uYVolSpace - m_v3dRegionOffset.getY(), uZVolSpace - m_v3dRegionOffset.getZ() + 0.5f * m_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 = m_ispCurrent->addVertex(surfaceVertex);
|
|
m_pCurrentVertexIndicesZ[getIndex(uXVolSpace - m_v3dRegionOffset.getX(),uYVolSpace - m_v3dRegionOffset.getY())] = uLastVertexIndex;
|
|
}
|
|
}
|
|
}//For each cell
|
|
}
|
|
}
|
|
|
|
void SurfaceExtractor::generateIndicesForSlice()
|
|
{
|
|
uint32_t indlist[12];
|
|
|
|
for(uint16_t uYVolSpace = regSlice0.getLowerCorner().getY(); uYVolSpace < regSlice0.getUpperCorner().getY(); uYVolSpace += m_uStepSize)
|
|
{
|
|
for(uint16_t uXVolSpace = regSlice0.getLowerCorner().getX(); uXVolSpace < regSlice0.getUpperCorner().getX(); uXVolSpace += m_uStepSize)
|
|
{
|
|
uint16_t uZVolSpace = regSlice0.getLowerCorner().getZ();
|
|
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
|
|
|
|
//Current position
|
|
const uint16_t uXRegSpace = m_sampVolume.getPosX() - m_v3dRegionOffset.getX();
|
|
const uint16_t uYRegSpace = m_sampVolume.getPosY() - m_v3dRegionOffset.getY();
|
|
const uint16_t uZRegSpace = m_sampVolume.getPosZ() - m_v3dRegionOffset.getZ();
|
|
|
|
//Determine the index into the edge table which tells us which vertices are inside of the surface
|
|
uint8_t iCubeIndex = m_pPreviousBitmask[getIndex(uXRegSpace,uYRegSpace)];
|
|
|
|
/* 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] = m_pPreviousVertexIndicesX[getIndex(uXRegSpace,uYRegSpace)];
|
|
assert(indlist[0] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 2)
|
|
{
|
|
indlist[1] = m_pPreviousVertexIndicesY[getIndex(uXRegSpace+m_uStepSize,uYRegSpace)];
|
|
assert(indlist[1] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 4)
|
|
{
|
|
indlist[2] = m_pPreviousVertexIndicesX[getIndex(uXRegSpace,uYRegSpace+m_uStepSize)];
|
|
assert(indlist[2] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 8)
|
|
{
|
|
indlist[3] = m_pPreviousVertexIndicesY[getIndex(uXRegSpace,uYRegSpace)];
|
|
assert(indlist[3] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 16)
|
|
{
|
|
indlist[4] = m_pCurrentVertexIndicesX[getIndex(uXRegSpace,uYRegSpace)];
|
|
assert(indlist[4] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 32)
|
|
{
|
|
indlist[5] = m_pCurrentVertexIndicesY[getIndex(uXRegSpace+m_uStepSize,uYRegSpace)];
|
|
assert(indlist[5] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 64)
|
|
{
|
|
indlist[6] = m_pCurrentVertexIndicesX[getIndex(uXRegSpace,uYRegSpace+m_uStepSize)];
|
|
assert(indlist[6] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 128)
|
|
{
|
|
indlist[7] = m_pCurrentVertexIndicesY[getIndex(uXRegSpace,uYRegSpace)];
|
|
assert(indlist[7] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 256)
|
|
{
|
|
indlist[8] = m_pPreviousVertexIndicesZ[getIndex(uXRegSpace,uYRegSpace)];
|
|
assert(indlist[8] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 512)
|
|
{
|
|
indlist[9] = m_pPreviousVertexIndicesZ[getIndex(uXRegSpace+m_uStepSize,uYRegSpace)];
|
|
assert(indlist[9] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 1024)
|
|
{
|
|
indlist[10] = m_pPreviousVertexIndicesZ[getIndex(uXRegSpace+m_uStepSize,uYRegSpace+m_uStepSize)];
|
|
assert(indlist[10] != -1);
|
|
}
|
|
if (edgeTable[iCubeIndex] & 2048)
|
|
{
|
|
indlist[11] = m_pPreviousVertexIndicesZ[getIndex(uXRegSpace,uYRegSpace+m_uStepSize)];
|
|
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]];
|
|
|
|
m_ispCurrent->addTriangle(ind0, ind1, ind2);
|
|
}//For each triangle
|
|
}//For each cell
|
|
}
|
|
}
|
|
} |