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Vertices now know whether they are on the edge of an indexed surface patch. This allows improved smoothing.

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This commit is contained in:
David Williams
2009-07-23 16:54:46 +00:00
parent ab906a03f6
commit e5d38b597e
6 changed files with 36 additions and 20 deletions
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20
library/PolyVoxCore/source/SurfaceExtractor.cpp
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@ -554,17 +554,21 @@ namespace PolyVox
void SurfaceExtractor::generateVerticesForSlice()
{
uint16_t uZVolSpace = m_regSliceCurrent.getLowerCorner().getZ();
const uint16_t uZRegSpace = uZVolSpace - m_regInputCropped.getLowerCorner().getZ();
bool isZEdge = ((uZVolSpace == m_regInputCropped.getLowerCorner().getZ()) || (uZVolSpace == m_regInputCropped.getUpperCorner().getZ()));
//Iterate over each cell in the region
for(uint16_t uYVolSpace = m_regSliceCurrent.getLowerCorner().getY(); uYVolSpace <= m_regSliceCurrent.getUpperCorner().getY(); uYVolSpace += m_uStepSize)
{
const uint16_t uYRegSpace = uYVolSpace - m_regInputCropped.getLowerCorner().getY();
bool isYEdge = ((uYVolSpace == m_regInputCropped.getLowerCorner().getY()) || (uYVolSpace == m_regInputCropped.getUpperCorner().getY()));
for(uint16_t uXVolSpace = m_regSliceCurrent.getLowerCorner().getX(); uXVolSpace <= m_regSliceCurrent.getUpperCorner().getX(); uXVolSpace += m_uStepSize)
{
uint16_t uZVolSpace = m_regSliceCurrent.getLowerCorner().getZ();
//Current position
const uint16_t uXRegSpace = uXVolSpace - m_regInputCropped.getLowerCorner().getX();
const uint16_t uYRegSpace = uYVolSpace - m_regInputCropped.getLowerCorner().getY();
const uint16_t uZRegSpace = uZVolSpace - m_regInputCropped.getLowerCorner().getZ();
bool isXEdge = ((uXVolSpace == m_regInputCropped.getLowerCorner().getX()) || (uXVolSpace == m_regInputCropped.getUpperCorner().getX()));
//Determine the index into the edge table which tells us which vertices are inside of the surface
uint8_t iCubeIndex = m_pCurrentBitmask[getIndex(uXRegSpace,uYRegSpace)];
@ -575,6 +579,9 @@ namespace PolyVox
continue;
}
//Check whether the generated vertex will lie on the edge of the region
m_sampVolume.setPosition(uXVolSpace,uYVolSpace,uZVolSpace);
const uint8_t v000 = m_sampVolume.getSubSampledVoxel(m_uLodLevel);
@ -587,6 +594,7 @@ namespace PolyVox
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);
surfaceVertex.setEdgeVertex(isXEdge || isYEdge || isZEdge);
uint32_t uLastVertexIndex = m_ispCurrent->addVertex(surfaceVertex);
m_pCurrentVertexIndicesX[getIndex(uXVolSpace - m_regInputCropped.getLowerCorner().getX(),uYVolSpace - m_regInputCropped.getLowerCorner().getY())] = uLastVertexIndex;
}
@ -598,6 +606,7 @@ namespace PolyVox
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);
surfaceVertex.setEdgeVertex(isXEdge || isYEdge || isZEdge);
uint32_t uLastVertexIndex = m_ispCurrent->addVertex(surfaceVertex);
m_pCurrentVertexIndicesY[getIndex(uXVolSpace - m_regInputCropped.getLowerCorner().getX(),uYVolSpace - m_regInputCropped.getLowerCorner().getY())] = uLastVertexIndex;
}
@ -608,7 +617,8 @@ namespace PolyVox
const Vector3DFloat v3dPosition(uXVolSpace - m_regInputCropped.getLowerCorner().getX(), uYVolSpace - m_regInputCropped.getLowerCorner().getY(), uZVolSpace - m_regInputCropped.getLowerCorner().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);
SurfaceVertex surfaceVertex(v3dPosition, v3dNormal, uMaterial);
surfaceVertex.setEdgeVertex(isXEdge || isYEdge || isZEdge);
uint32_t uLastVertexIndex = m_ispCurrent->addVertex(surfaceVertex);
m_pCurrentVertexIndicesZ[getIndex(uXVolSpace - m_regInputCropped.getLowerCorner().getX(),uYVolSpace - m_regInputCropped.getLowerCorner().getY())] = uLastVertexIndex;
}