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Optimised order in which slice elements are processed.

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This commit is contained in:
David Williams 2009-06-03 21:02:15 +00:00
parent cd0f8529ca
commit 57eed6e901
1 changed files with 23 additions and 45 deletions
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68
library/PolyVoxCore/source/SurfaceExtractor.cpp
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@ -131,58 +131,40 @@ namespace PolyVox
uZVolSpace = regSlice1.getLowerCorner().getZ();
uZRegSpace = uZVolSpace - m_v3dRegionOffset.getZ();
//Iterate over each cell in the region
/*for(*/uYVolSpace = regSlice1.getLowerCorner().getY();/* uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)*/
{
/*for(*/uXVolSpace = regSlice1.getLowerCorner().getX();/* uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)*/
{
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
//Process the lower left corner
uYVolSpace = regSlice1.getLowerCorner().getY();
uXVolSpace = regSlice1.getLowerCorner().getX();
//Current position
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
//Determine the index into the edge table which tells us which vertices are inside of the surface
computeBitmaskForCell(false, false, !bIsFirstSlice, m_uLodLevel);
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
computeBitmaskForCell(false, false, !bIsFirstSlice, m_uLodLevel);
}//For each cell
}
//Iterate over each cell in the region
//Process the edge where x is minimal.
uXVolSpace = regSlice1.getLowerCorner().getX();
for(uYVolSpace = regSlice1.getLowerCorner().getY() + m_uStepSize; uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)
{
/*for(*/uXVolSpace = regSlice1.getLowerCorner().getX();/* uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)*/
{
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
//Current position
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
//Determine the index into the edge table which tells us which vertices are inside of the surface
computeBitmaskForCell(false, true, !bIsFirstSlice, m_uLodLevel);
}//For each cell
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
computeBitmaskForCell(false, true, !bIsFirstSlice, m_uLodLevel);
}
//Iterate over each cell in the region
/*for(*/uYVolSpace = regSlice1.getLowerCorner().getY();/* uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)*/
{
for(uXVolSpace = regSlice1.getLowerCorner().getX() + m_uStepSize; uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)
{
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
//Process the edge where y is minimal.
uYVolSpace = regSlice1.getLowerCorner().getY();
for(uXVolSpace = regSlice1.getLowerCorner().getX() + m_uStepSize; uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)
{
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
//Current position
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
//Determine the index into the edge table which tells us which vertices are inside of the surface
computeBitmaskForCell(true, false, !bIsFirstSlice, m_uLodLevel);
}//For each cell
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
computeBitmaskForCell(true, false, !bIsFirstSlice, m_uLodLevel);
}
//Iterate over each cell in the region
//Process all remaining elemnents of the slice. In this case, previous x and y values are always available
for(uYVolSpace = regSlice1.getLowerCorner().getY() + m_uStepSize; uYVolSpace <= uMaxYVolSpace; uYVolSpace += m_uStepSize)
{
for(uXVolSpace = regSlice1.getLowerCorner().getX() + m_uStepSize; uXVolSpace <= uMaxXVolSpace; uXVolSpace += m_uStepSize)
@ -190,13 +172,9 @@ namespace PolyVox
uXRegSpace = uXVolSpace - m_v3dRegionOffset.getX();
uYRegSpace = uYVolSpace - m_v3dRegionOffset.getY();
//Current position
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
//Determine the index into the edge table which tells us which vertices are inside of the surface
computeBitmaskForCell(true, true, !bIsFirstSlice, m_uLodLevel);
}//For each cell
}
}
return m_uNoOfOccupiedCells;