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New marching cubes implementation - computeBitmaskForSlice is now only called once per slice.

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This commit is contained in:
David Williams
2008-06-05 18:28:21 +00:00
parent 63b2c5ccb0
commit 8bf6f4d08d
2 changed files with 28 additions and 20 deletions
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46
source/SurfaceExtractors.cpp
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@ -53,15 +53,34 @@ namespace PolyVox
//Offset from region corner
const Vector3DFloat offset = static_cast<Vector3DFloat>(region.getLowerCorner());
//Cell bitmasks
boost::uint8_t bitmask0[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
boost::uint8_t bitmask1[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
memset(bitmask0, 0x00, sizeof(bitmask0));
memset(bitmask1, 0x00, sizeof(bitmask1));
Region regFirstSlice(region);
regFirstSlice.setUpperCorner(Vector3DInt32(regFirstSlice.getUpperCorner().getX(),regFirstSlice.getUpperCorner().getY(),regFirstSlice.getLowerCorner().getZ()));
BlockVolumeIterator<boost::uint8_t> volIter(*volumeData);
computeBitmaskForSlice(volIter, regFirstSlice, offset, bitmask0);
for(boost::uint32_t uSlice = 0; ((uSlice <= 15) && (uSlice + offset.getZ() < region.getUpperCorner().getZ())); ++uSlice)
{
Vector3DInt32 lowerCorner = Vector3DInt32(region.getLowerCorner().getX(), region.getLowerCorner().getY(), region.getLowerCorner().getZ() + uSlice);
Vector3DInt32 upperCorner = Vector3DInt32(region.getUpperCorner().getX(), region.getUpperCorner().getY(), region.getLowerCorner().getZ() + uSlice + 1);
Region regTwoSlice(lowerCorner, upperCorner);
generateExperimentalMeshDataForRegionSlice(volIter, regTwoSlice, singleMaterialPatch, offset);
Region regSecondSlice(regTwoSlice);
regSecondSlice.setLowerCorner(regSecondSlice.getLowerCorner() + Vector3DInt32(0,0,1));
computeBitmaskForSlice(volIter, regSecondSlice, offset, bitmask1);
generateExperimentalMeshDataForRegionSlice(volIter, regTwoSlice, singleMaterialPatch, offset, bitmask0, bitmask1);
memcpy(bitmask0, bitmask1, sizeof(bitmask0));
memset(bitmask1, 0, sizeof(bitmask1));
}
@ -74,7 +93,7 @@ namespace PolyVox
}
}
void generateExperimentalMeshDataForRegionSlice(BlockVolumeIterator<uint8_t>& volIter, Region regTwoSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset)
void generateExperimentalMeshDataForRegionSlice(BlockVolumeIterator<uint8_t>& volIter, Region regTwoSlice, IndexedSurfacePatch* singleMaterialPatch, const Vector3DFloat& offset, uint8_t bitmask0[][POLYVOX_REGION_SIDE_LENGTH+1], uint8_t bitmask1[][POLYVOX_REGION_SIDE_LENGTH+1])
{
//For edge indices
boost::int32_t vertexIndicesX[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
@ -82,28 +101,16 @@ namespace PolyVox
boost::int32_t vertexIndicesZ[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
memset(vertexIndicesX,0xFF,sizeof(vertexIndicesX)); //0xFF is -1 as two's complement - this may not be portable...
memset(vertexIndicesY,0xFF,sizeof(vertexIndicesY));
memset(vertexIndicesZ,0xFF,sizeof(vertexIndicesZ));
//Cell bitmasks
boost::uint8_t bitmask0[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
boost::uint8_t bitmask1[POLYVOX_REGION_SIDE_LENGTH+1][POLYVOX_REGION_SIDE_LENGTH+1];
memset(bitmask0, 0x00, sizeof(bitmask0));
memset(bitmask1, 0x00, sizeof(bitmask1));
memset(vertexIndicesZ,0xFF,sizeof(vertexIndicesZ));
Region regFirstSlice(regTwoSlice);
regFirstSlice.setUpperCorner(regFirstSlice.getUpperCorner() - Vector3DInt32(0,0,1));
Region regSecondSlice(regTwoSlice);
regSecondSlice.setLowerCorner(regSecondSlice.getLowerCorner() + Vector3DInt32(0,0,1));
//////////////////////////////////////////////////////////////////////////
// Compute bitmasks
//////////////////////////////////////////////////////////////////////////
computeBitmaskForSlice(volIter, regFirstSlice, offset, bitmask0);
computeBitmaskForSlice(volIter, regSecondSlice, offset, bitmask1);
//////////////////////////////////////////////////////////////////////////
//Get mesh data
//Generate vertices
//////////////////////////////////////////////////////////////////////////
Vector3DFloat vertlist[12];
@ -237,15 +244,16 @@ namespace PolyVox
}
}while(volIter.moveForwardInRegionXYZ());//For each cell
//////////////////////////////////////////////////////////////
// Set the indices
//////////////////////////////////////////////////////////////
boost::uint32_t indlist[12];
//Iterate over each cell in the region
regTwoSlice.setUpperCorner(regTwoSlice.getUpperCorner() - Vector3DInt32(1,1,1));
volIter.setPosition(regTwoSlice.getLowerCorner().getX(),regTwoSlice.getLowerCorner().getY(), regTwoSlice.getLowerCorner().getZ());
volIter.setValidRegion(regTwoSlice);
regFirstSlice.setUpperCorner(regFirstSlice.getUpperCorner() - Vector3DInt32(1,1,0));
volIter.setPosition(regFirstSlice.getLowerCorner().getX(),regFirstSlice.getLowerCorner().getY(), regFirstSlice.getLowerCorner().getZ());
volIter.setValidRegion(regFirstSlice);
//while(volIter.moveForwardInRegionXYZ())
do
{