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rewrote checkflip edge.

This commit is contained in:
Paolo Cignoni 2010-10-01 20:27:30 +00:00
parent 8370978230
commit f83dc8b993
1 changed files with 18 additions and 11 deletions
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29
vcg/simplex/face/topology.h
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@ -363,35 +363,42 @@ void SwapEdge(FaceType &f, const int z)
template <class FaceType>
static bool CheckFlipEdge(FaceType &f, int z)
{
if (z<0 || z>2)
return false;
typedef typename FaceType::VertexType VertexType;
typedef typename vcg::face::Pos< FaceType > PosType;
if (z<0 || z>2) return false;
// boundary edges cannot be flipped
if (face::IsBorder(f, z))
return false;
if (face::IsBorder(f, z)) return false;
FaceType *g = f.FFp(z);
int w = f.FFi(z);
// check if the vertices of the edge are the same
// e.g. the mesh has to be well oriented
if (g->V(w)!=f.V1(z) || g->V1(w)!=f.V(z) )
return false;
// check if the flipped edge is already present in the mesh
typedef typename FaceType::VertexType VertexType;
VertexType *f_v2 = f.V2(z);
// f_v2 and g_v2 are the vertices of the new edge
VertexType *f_v2 = f.V2(z);
VertexType *g_v2 = g->V2(w);
if (f_v2 == g_v2)
return false;
vcg::face::Pos< FaceType > pos(&f, (z+2)%3, f.V2(z));
// just a sanity check. If this happens the mesh is not manifold.
if (f_v2 == g_v2) return false;
// Now walk around f_v2, one of the two vertexes of the new edge
// and check that it does not already exists.
PosType pos(&f, (z+2)%3, f_v2);
PosType startPos=pos;
do
{
pos.NextE();
if (g_v2==pos.f->V1(pos.z))
if (g_v2 == pos.VFlip())
return false;
}
while (&f!=pos.f);
while (pos != startPos);
return true;
}