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Merging code for Lod0 with code for other Lod levels.

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This commit is contained in:
David Williams 2009-05-30 09:37:12 +00:00
parent 358d07b234
commit 44d1178434
3 changed files with 36 additions and 144 deletions
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6
examples/OpenGL/OpenGLWidget.cpp
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@ -38,7 +38,7 @@ void OpenGLWidget::setVolume(PolyVox::Volume<PolyVox::uint8_t>* volData)
m_uVolumeDepthInRegions = volData->getDepth() / m_uRegionSideLength; m_uVolumeDepthInRegions = volData->getDepth() / m_uRegionSideLength;
SurfaceExtractor surfaceExtractor(*volData); SurfaceExtractor surfaceExtractor(*volData);
surfaceExtractor.setLodLevel(0); surfaceExtractor.setLodLevel(1);
//Our volume is broken down into cuboid regions, and we create one mesh for each region. //Our volume is broken down into cuboid regions, and we create one mesh for each region.
//This three-level for loop iterates over each region. //This three-level for loop iterates over each region.
@ -67,9 +67,9 @@ void OpenGLWidget::setVolume(PolyVox::Volume<PolyVox::uint8_t>* volData)
//extractSurface(m_volData, 0, PolyVox::Region(regLowerCorner, regUpperCorner), ispCurrent); //extractSurface(m_volData, 0, PolyVox::Region(regLowerCorner, regUpperCorner), ispCurrent);
POLYVOX_SHARED_PTR<IndexedSurfacePatch> isp = surfaceExtractor.extractSurfaceForRegion(PolyVox::Region(regLowerCorner, regUpperCorner)); POLYVOX_SHARED_PTR<IndexedSurfacePatch> isp = surfaceExtractor.extractSurfaceForRegion(PolyVox::Region(regLowerCorner, regUpperCorner));
computeNormalsForVertices(m_volData, *(isp.get()), SOBEL_SMOOTHED); //computeNormalsForVertices(m_volData, *(isp.get()), SOBEL_SMOOTHED);
//*ispCurrent = getSmoothedSurface(*ispCurrent); //*ispCurrent = getSmoothedSurface(*ispCurrent);
isp->smooth(0.3f); //isp->smooth(0.3f);
//ispCurrent->generateAveragedFaceNormals(true); //ispCurrent->generateAveragedFaceNormals(true);

3
library/PolyVoxCore/include/SurfaceExtractor.h
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@ -53,12 +53,11 @@ namespace PolyVox
void extractSurfaceForRegionLevel0(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch); void extractSurfaceForRegionLevel0(Volume<uint8_t>* volumeData, Region region, IndexedSurfacePatch* singleMaterialPatch);
uint32_t computeBitmaskForSliceLevel0(VolumeSampler<uint8_t>& volIter, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask); uint32_t computeBitmaskForSliceLevel0(VolumeSampler<uint8_t>& volIter, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask);
void generateIndicesForSliceLevel0(VolumeSampler<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[]);
void generateVerticesForSliceLevel0(VolumeSampler<uint8_t>& volIter, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[]); void generateVerticesForSliceLevel0(VolumeSampler<uint8_t>& volIter, Region& regSlice, const Vector3DFloat& offset, uint8_t* bitmask, IndexedSurfacePatch* singleMaterialPatch,int32_t vertexIndicesX[],int32_t vertexIndicesY[],int32_t vertexIndicesZ[]);
void extractDecimatedSurfaceImpl(Volume<uint8_t>* volumeData, uint8_t uLevel, Region region, IndexedSurfacePatch* singleMaterialPatch); void extractDecimatedSurfaceImpl(Volume<uint8_t>* volumeData, uint8_t uLevel, Region region, IndexedSurfacePatch* singleMaterialPatch);
uint32_t computeDecimatedBitmaskForSlice(VolumeSampler<uint8_t>& volIter, uint8_t uLevel, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask); uint32_t computeDecimatedBitmaskForSlice(VolumeSampler<uint8_t>& volIter, uint8_t uLevel, const Region& regSlice, const Vector3DFloat& offset, uint8_t *bitmask, uint8_t *previousBitmask);
void generateDecimatedIndicesForSlice(VolumeSampler<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[]); void generateIndicesForSlice(VolumeSampler<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[]);
void generateDecimatedVerticesForSlice(VolumeSampler<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[]); void generateDecimatedVerticesForSlice(VolumeSampler<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[]);
}; };
} }

171
library/PolyVoxCore/source/SurfaceExtractor.cpp
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@ -54,16 +54,16 @@ namespace PolyVox
singleMaterialPatch->clear(); singleMaterialPatch->clear();
//For edge indices //For edge indices
int32_t* vertexIndicesX0 = new int32_t[(region.width()+2) * (region.height()+2)]; int32_t* vertexIndicesX0 = new int32_t[(region.width()+8) * (region.height()+8)];
int32_t* vertexIndicesY0 = new int32_t[(region.width()+2) * (region.height()+2)]; int32_t* vertexIndicesY0 = new int32_t[(region.width()+8) * (region.height()+8)];
int32_t* vertexIndicesZ0 = new int32_t[(region.width()+2) * (region.height()+2)]; int32_t* vertexIndicesZ0 = new int32_t[(region.width()+8) * (region.height()+8)];
int32_t* vertexIndicesX1 = new int32_t[(region.width()+2) * (region.height()+2)]; int32_t* vertexIndicesX1 = new int32_t[(region.width()+8) * (region.height()+8)];
int32_t* vertexIndicesY1 = new int32_t[(region.width()+2) * (region.height()+2)]; int32_t* vertexIndicesY1 = new int32_t[(region.width()+8) * (region.height()+8)];
int32_t* vertexIndicesZ1 = new int32_t[(region.width()+2) * (region.height()+2)]; int32_t* vertexIndicesZ1 = new int32_t[(region.width()+8) * (region.height()+8)];
//Cell bitmasks //Cell bitmasks
uint8_t* bitmask0 = new uint8_t[(region.width()+2) * (region.height()+2)]; uint8_t* bitmask0 = new uint8_t[(region.width()+8) * (region.height()+8)];
uint8_t* bitmask1 = new uint8_t[(region.width()+2) * (region.height()+2)]; uint8_t* bitmask1 = new uint8_t[(region.width()+8) * (region.height()+8)];
//When generating the mesh for a region we actually look one voxel outside it in the //When generating the mesh for a region we actually look one voxel outside it in the
// back, bottom, right direction. Protect against access violations by cropping region here // back, bottom, right direction. Protect against access violations by cropping region here
@ -103,7 +103,7 @@ namespace PolyVox
if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0)) if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0))
{ {
generateIndicesForSliceLevel0(volIter, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1); generateIndicesForSlice(volIter, 0, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
} }
std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1); std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1);
@ -438,118 +438,6 @@ namespace PolyVox
} }
} }
void SurfaceExtractor::generateIndicesForSliceLevel0(VolumeSampler<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[])
{
uint32_t indlist[12];
//Iterate over each cell in the region
for(uint16_t uYVolSpace = regSlice.getLowerCorner().getY(); uYVolSpace < regSlice.getUpperCorner().getY(); uYVolSpace++)
{
for(uint16_t uXVolSpace = regSlice.getLowerCorner().getX(); uXVolSpace < regSlice.getUpperCorner().getX(); uXVolSpace++)
{
uint16_t uZVolSpace = regSlice.getLowerCorner().getZ();
volIter.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
//Current position
const uint16_t uXRegSpace = volIter.getPosX() - offset.getX();
const uint16_t uYRegSpace = volIter.getPosY() - offset.getY();
const uint16_t uZRegSpace = volIter.getPosZ() - offset.getZ();
//Determine the index into the edge table which tells us which vertices are inside of the surface
uint8_t iCubeIndex = bitmask0[getIndex(uXRegSpace,uYRegSpace, 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[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[0] != -1);
assert(indlist[0] < 10000);
}
if (edgeTable[iCubeIndex] & 2)
{
indlist[1] = vertexIndicesY0[getIndex(uXRegSpace+1,uYRegSpace, regSlice.width()+1)];
assert(indlist[1] != -1);
assert(indlist[1] < 10000);
}
if (edgeTable[iCubeIndex] & 4)
{
indlist[2] = vertexIndicesX0[getIndex(uXRegSpace,uYRegSpace+1, regSlice.width()+1)];
assert(indlist[2] != -1);
assert(indlist[2] < 10000);
}
if (edgeTable[iCubeIndex] & 8)
{
indlist[3] = vertexIndicesY0[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[3] != -1);
assert(indlist[3] < 10000);
}
if (edgeTable[iCubeIndex] & 16)
{
indlist[4] = vertexIndicesX1[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[4] != -1);
assert(indlist[4] < 10000);
}
if (edgeTable[iCubeIndex] & 32)
{
indlist[5] = vertexIndicesY1[getIndex(uXRegSpace+1,uYRegSpace, regSlice.width()+1)];
assert(indlist[5] != -1);
assert(indlist[5] < 10000);
}
if (edgeTable[iCubeIndex] & 64)
{
indlist[6] = vertexIndicesX1[getIndex(uXRegSpace,uYRegSpace+1, regSlice.width()+1)];
assert(indlist[6] != -1);
assert(indlist[6] < 10000);
}
if (edgeTable[iCubeIndex] & 128)
{
indlist[7] = vertexIndicesY1[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[7] != -1);
assert(indlist[7] < 10000);
}
if (edgeTable[iCubeIndex] & 256)
{
indlist[8] = vertexIndicesZ0[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[8] != -1);
assert(indlist[8] < 10000);
}
if (edgeTable[iCubeIndex] & 512)
{
indlist[9] = vertexIndicesZ0[getIndex(uXRegSpace+1,uYRegSpace, regSlice.width()+1)];
assert(indlist[9] != -1);
assert(indlist[9] < 10000);
}
if (edgeTable[iCubeIndex] & 1024)
{
indlist[10] = vertexIndicesZ0[getIndex(uXRegSpace+1,uYRegSpace+1, regSlice.width()+1)];
assert(indlist[10] != -1);
assert(indlist[10] < 10000);
}
if (edgeTable[iCubeIndex] & 2048)
{
indlist[11] = vertexIndicesZ0[getIndex(uXRegSpace,uYRegSpace+1, regSlice.width()+1)];
assert(indlist[11] != -1);
assert(indlist[11] < 10000);
}
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
}
}
}
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
// Level 1 // Level 1
//////////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////////////
@ -616,7 +504,7 @@ namespace PolyVox
if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0)) if((uNoOfNonEmptyCellsForSlice0 != 0) || (uNoOfNonEmptyCellsForSlice1 != 0))
{ {
generateDecimatedIndicesForSlice(volIter, uLevel, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1); generateIndicesForSlice(volIter, uLevel, regSlice0, singleMaterialPatch, offset, bitmask0, bitmask1, vertexIndicesX0, vertexIndicesY0, vertexIndicesZ0, vertexIndicesX1, vertexIndicesY1, vertexIndicesZ1);
} }
std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1); std::swap(uNoOfNonEmptyCellsForSlice0, uNoOfNonEmptyCellsForSlice1);
@ -960,20 +848,25 @@ namespace PolyVox
} }
} }
void SurfaceExtractor::generateDecimatedIndicesForSlice(VolumeSampler<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[]) void SurfaceExtractor::generateIndicesForSlice(VolumeSampler<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; const uint8_t uStepSize = uLevel == 0 ? 1 : 1 << uLevel;
uint32_t indlist[12]; uint32_t indlist[12];
for(uint16_t y = regSlice.getLowerCorner().getY() - offset.getY(); y < regSlice.getUpperCorner().getY() - offset.getY(); y += uStepSize) for(uint16_t uYVolSpace = regSlice.getLowerCorner().getY(); uYVolSpace < regSlice.getUpperCorner().getY(); uYVolSpace += uStepSize)
{ {
for(uint16_t x = regSlice.getLowerCorner().getX() - offset.getX(); x < regSlice.getUpperCorner().getX() - offset.getX(); x += uStepSize) for(uint16_t uXVolSpace = regSlice.getLowerCorner().getX(); uXVolSpace < regSlice.getUpperCorner().getX(); uXVolSpace += uStepSize)
{ {
uint16_t uZVolSpace = regSlice.getLowerCorner().getZ();
volIter.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
//Current position //Current position
const uint16_t z = regSlice.getLowerCorner().getZ() - offset.getZ(); const uint16_t uXRegSpace = volIter.getPosX() - offset.getX();
const uint16_t uYRegSpace = volIter.getPosY() - offset.getY();
const uint16_t uZRegSpace = volIter.getPosZ() - offset.getZ();
//Determine the index into the edge table which tells us which vertices are inside of the surface //Determine the index into the edge table which tells us which vertices are inside of the surface
uint8_t iCubeIndex = bitmask0[getIndex(x,y, regSlice.width()+1)]; uint8_t iCubeIndex = bitmask0[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
/* Cube is entirely in/out of the surface */ /* Cube is entirely in/out of the surface */
if (edgeTable[iCubeIndex] == 0) if (edgeTable[iCubeIndex] == 0)
@ -984,62 +877,62 @@ namespace PolyVox
/* Find the vertices where the surface intersects the cube */ /* Find the vertices where the surface intersects the cube */
if (edgeTable[iCubeIndex] & 1) if (edgeTable[iCubeIndex] & 1)
{ {
indlist[0] = vertexIndicesX0[getIndex(x,y, regSlice.width()+1)]; indlist[0] = vertexIndicesX0[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[0] != -1); assert(indlist[0] != -1);
} }
if (edgeTable[iCubeIndex] & 2) if (edgeTable[iCubeIndex] & 2)
{ {
indlist[1] = vertexIndicesY0[getIndex(x+uStepSize,y, regSlice.width()+1)]; indlist[1] = vertexIndicesY0[getIndex(uXRegSpace+uStepSize,uYRegSpace, regSlice.width()+1)];
assert(indlist[1] != -1); assert(indlist[1] != -1);
} }
if (edgeTable[iCubeIndex] & 4) if (edgeTable[iCubeIndex] & 4)
{ {
indlist[2] = vertexIndicesX0[getIndex(x,y+uStepSize, regSlice.width()+1)]; indlist[2] = vertexIndicesX0[getIndex(uXRegSpace,uYRegSpace+uStepSize, regSlice.width()+1)];
assert(indlist[2] != -1); assert(indlist[2] != -1);
} }
if (edgeTable[iCubeIndex] & 8) if (edgeTable[iCubeIndex] & 8)
{ {
indlist[3] = vertexIndicesY0[getIndex(x,y, regSlice.width()+1)]; indlist[3] = vertexIndicesY0[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[3] != -1); assert(indlist[3] != -1);
} }
if (edgeTable[iCubeIndex] & 16) if (edgeTable[iCubeIndex] & 16)
{ {
indlist[4] = vertexIndicesX1[getIndex(x,y, regSlice.width()+1)]; indlist[4] = vertexIndicesX1[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[4] != -1); assert(indlist[4] != -1);
} }
if (edgeTable[iCubeIndex] & 32) if (edgeTable[iCubeIndex] & 32)
{ {
indlist[5] = vertexIndicesY1[getIndex(x+uStepSize,y, regSlice.width()+1)]; indlist[5] = vertexIndicesY1[getIndex(uXRegSpace+uStepSize,uYRegSpace, regSlice.width()+1)];
assert(indlist[5] != -1); assert(indlist[5] != -1);
} }
if (edgeTable[iCubeIndex] & 64) if (edgeTable[iCubeIndex] & 64)
{ {
indlist[6] = vertexIndicesX1[getIndex(x,y+uStepSize, regSlice.width()+1)]; indlist[6] = vertexIndicesX1[getIndex(uXRegSpace,uYRegSpace+uStepSize, regSlice.width()+1)];
assert(indlist[6] != -1); assert(indlist[6] != -1);
} }
if (edgeTable[iCubeIndex] & 128) if (edgeTable[iCubeIndex] & 128)
{ {
indlist[7] = vertexIndicesY1[getIndex(x,y, regSlice.width()+1)]; indlist[7] = vertexIndicesY1[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[7] != -1); assert(indlist[7] != -1);
} }
if (edgeTable[iCubeIndex] & 256) if (edgeTable[iCubeIndex] & 256)
{ {
indlist[8] = vertexIndicesZ0[getIndex(x,y, regSlice.width()+1)]; indlist[8] = vertexIndicesZ0[getIndex(uXRegSpace,uYRegSpace, regSlice.width()+1)];
assert(indlist[8] != -1); assert(indlist[8] != -1);
} }
if (edgeTable[iCubeIndex] & 512) if (edgeTable[iCubeIndex] & 512)
{ {
indlist[9] = vertexIndicesZ0[getIndex(x+uStepSize,y, regSlice.width()+1)]; indlist[9] = vertexIndicesZ0[getIndex(uXRegSpace+uStepSize,uYRegSpace, regSlice.width()+1)];
assert(indlist[9] != -1); assert(indlist[9] != -1);
} }
if (edgeTable[iCubeIndex] & 1024) if (edgeTable[iCubeIndex] & 1024)
{ {
indlist[10] = vertexIndicesZ0[getIndex(x+uStepSize,y+uStepSize, regSlice.width()+1)]; indlist[10] = vertexIndicesZ0[getIndex(uXRegSpace+uStepSize,uYRegSpace+uStepSize, regSlice.width()+1)];
assert(indlist[10] != -1); assert(indlist[10] != -1);
} }
if (edgeTable[iCubeIndex] & 2048) if (edgeTable[iCubeIndex] & 2048)
{ {
indlist[11] = vertexIndicesZ0[getIndex(x,y+uStepSize, regSlice.width()+1)]; indlist[11] = vertexIndicesZ0[getIndex(uXRegSpace,uYRegSpace+uStepSize, regSlice.width()+1)];
assert(indlist[11] != -1); assert(indlist[11] != -1);
} }