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Rewrite SwapEdge to fix problems with borders

This commit is contained in:
Massimiliano Corsini 2005-12-19 13:47:26 +00:00
parent ebf6ae99a4
commit 009f633576
1 changed files with 31 additions and 15 deletions
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46
vcg/simplex/face/topology.h
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@ -24,6 +24,9 @@
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$Log: not supported by cvs2svn $ $Log: not supported by cvs2svn $
Revision 1.25 2005/12/16 11:01:26 corsini
Remove trivial warnings
Revision 1.24 2005/12/16 10:47:48 corsini Revision 1.24 2005/12/16 10:47:48 corsini
Add further comment to FlipEdge Add further comment to FlipEdge
@ -279,31 +282,44 @@ bool CheckOrientation(FaceType &f, int z)
template <class FaceType> template <class FaceType>
void SwapEdge(FaceType &f, const int z) void SwapEdge(FaceType &f, const int z)
{ {
// store information to preserve topology // swap V0(z) with V1(z)
int z0 = z; swap(f.V0(z), f.V1(z));
int z1 = (z+1)%3;
int z2 = (z+2)%3;
FaceType *g1p = f.FFp(z1);
FaceType *g2p = f.FFp(z2);
int g1i = f.FFi(z1);
int g2i = f.FFi(z2);
// swap V0(z0) with V1(z0)
swap(f.V0(z0), f.V1(z0));
if(f.HasFFAdjacency()) if(f.HasFFAdjacency())
{ {
// store information to preserve topology
int z1 = (z+1)%3;
int z2 = (z+2)%3;
FaceType *g1p = f.FFp(z1);
FaceType *g2p = f.FFp(z2);
int g1i = f.FFi(z1);
int g2i = f.FFi(z2);
// g0 face topology is not affected by the swap // g0 face topology is not affected by the swap
if (g1p != &f) if (g1p != &f)
g1p->FFi(g1i) = f.FFi(z2); {
g1p->FFi(g1i) = z2;
f.FFi(z2) = g1i;
}
else
{
f.FFi(z2) = z2;
}
if (g2p != &f) if (g2p != &f)
g2p->FFi(g2i) = f.FFi(z1); {
g2p->FFi(g2i) = z1;
f.FFi(z1) = g2i;
}
else
{
f.FFi(z1) = z1;
}
// finalize swap // finalize swap
swap(f.FFp(z1), f.FFp(z2)); f.FFp(z1) = g2p;
swap(f.FFi(z1), f.FFi(z2)); f.FFp(z2) = g1p;
} }
} }