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Work on decimation code.

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This commit is contained in:
David Williams 2010-02-19 23:09:35 +00:00
parent 9aee0d26d2
commit 3ed74a982c
1 changed files with 25 additions and 17 deletions
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42
library/PolyVoxCore/source/IndexedSurfacePatch.cpp
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@ -633,28 +633,36 @@ namespace PolyVox
} }
} }
//...or those on geometry (region) edges. // Vertices on the geometrical edge of surface meshes need special handling.
/*if(m_vecVertices[v0].isOnGeometryEdge() || m_vecVertices[v1].isOnGeometryEdge()) // We check for this by whether any of the edge flags are set.
if(m_vecVertices[v0].m_bFlags.any() || m_vecVertices[v1].m_bFlags.any())
{ {
continue; // Assume we can't collapse until we prove otherwise...
}*/ bool bCollapseGeometryEdgePair = false;
// In theory it seems we should also allow edge vertices to collapse onto other edge vertices, // We can collapse normal vertices onto edge vertices, and edge vertices
// and also onto corner vertices.But a corner vertex shouldn't collapse onto another corner? // onto corner vertices, but not vice-versa. Hence we check whether all
// the edge flags in the source vertex are also set in the destination vertex.
if(isSubset(m_vecVertices[v0].m_bFlags, m_vecVertices[v1].m_bFlags))
{
// In general adjacent regions surface meshes may collapse differently
// and this can cause cracks. We solve this by only allowing the collapse
// is the normals are exactly the same. We do not use the user provided
// tolerence here (but do allow for floating point error).
if(m_vecVertices[v0].getNormal().dot(m_vecVertices[v1].getNormal()) > 0.999)
{
// Ok, this pair can collapse.
bCollapseGeometryEdgePair = true;
}
}
//After holiday, consider using the following line so that 'internal' vertices can collapse onto // Use the result.
//edges (but not vice-versa) and edges can collapse onto corners (but not vice-versa). if(!bCollapseGeometryEdgePair)
//FIXME - Stop corners collapsing onto corners! {
if(isSubset(m_vecVertices[v0].m_bFlags, m_vecVertices[v1].m_bFlags) == false) continue;
{ }
continue;
} }
/*if((m_vecVertices[v0].getNoOfGeometryEdges()) >= (m_vecVertices[v1].getNoOfGeometryEdges()))
{
continue;
}*/
//Check the normals are within the threashold. //Check the normals are within the threashold.
if(m_vecVertices[v0].getNormal().dot(m_vecVertices[v1].getNormal()) < fMinDotProductForCollapse) if(m_vecVertices[v0].getNormal().dot(m_vecVertices[v1].getNormal()) < fMinDotProductForCollapse)
{ {