AnotherFoxGuy/polyvox
1
0
Fork 0
Code Issues Pull Requests Activity

Added comments.

Browse Source
This commit is contained in:
David Williams 2015-05-25 16:45:52 +02:00
parent b353cd1ce8
commit e0ce93acb1
1 changed files with 17 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
include/PolyVox/MarchingCubesSurfaceExtractor.inl
View File

@ -97,23 +97,32 @@ namespace PolyVox
uint8_t iCubeIndex = 0;
uint8_t iPreviousCubeIndexX = uPreviousCell;
iPreviousCubeIndexX &= 170; //170 = 128+32+8+2
iPreviousCubeIndexX >>= 1;
iCubeIndex |= iPreviousCubeIndexX;
// Four bits of our cube index are obtained by looking at the cube index for
// the previous slice and copying four of those bits into their new positions.
uint8_t iPreviousCubeIndexZ = pPreviousSliceBitmask(uXRegSpace, uYRegSpace);
iPreviousCubeIndexZ >>= 4;
iCubeIndex |= iPreviousCubeIndexZ;
// Two bits of our cube index are obtained by looking at the cube index for
// the previous row and copying two of those bits into their new positions.
uint8_t iPreviousCubeIndexY = pPreviousRowBitmask(uXRegSpace);
iPreviousCubeIndexY &= 204; //204 = 128+64+8+4
iPreviousCubeIndexY >>= 2;
iCubeIndex |= iPreviousCubeIndexY;
uint8_t iPreviousCubeIndexZ = pPreviousSliceBitmask(uXRegSpace, uYRegSpace);
iPreviousCubeIndexZ >>= 4;
iCubeIndex |= iPreviousCubeIndexZ;
// One bit of our cube index are obtained by looking at the cube index for
// the previous cell and copying one of those bits into it's new position.
uint8_t iPreviousCubeIndexX = uPreviousCell;
iPreviousCubeIndexX &= 170; //170 = 128+32+8+2
iPreviousCubeIndexX >>= 1;
iCubeIndex |= iPreviousCubeIndexX;
typename VolumeType::VoxelType v111 = sampler.peekVoxel0px0py0pz();
// The last bit of our cube index is obtained by looking
// at the relevant voxel and comparing it to the threshold
typename VolumeType::VoxelType v111 = sampler.getVoxel();
if (m_controller.convertToDensity(v111) < m_tThreshold) iCubeIndex |= 128;
// The current value becomes the previous value, ready for the next iteration.
uPreviousCell = iCubeIndex;
pPreviousRowBitmask(uXRegSpace) = iCubeIndex;
pPreviousSliceBitmask(uXRegSpace, uYRegSpace) = iCubeIndex;