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Rewrote and commented the function that given a face pointer it follows the chain of non-faux edges. Now it supports the case of meshes with face with ALL edges faux (isolated faces in a polygon).

This commit is contained in:
Paolo Cignoni 2012-05-28 11:30:37 +00:00
parent 6254246a05
commit 75ebfa9d5a
1 changed files with 35 additions and 29 deletions
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64
vcg/complex/algorithms/polygon_support.h
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@ -141,36 +141,42 @@ namespace vcg
} }
} }
static void ExtractPolygon(typename TriMeshType::FacePointer tfi, std::vector<typename TriMeshType::VertexPointer> &vs){
vs.clear();
// find a non tagged edge
int se = -1;
for(int i=0; i<3; i++) if (!( tfi->IsF(i))) { se = i; break;}
assert(se!=-1); // else, all faux edges!
// initialize a pos on the first non faux edge
typename TriMeshType::VertexPointer v0 = tfi->V(se);
vcg::face::JumpingPos<typename TriMeshType::FaceType> p;
p.F() = tfi;
p.E() = se;
p.V() = p.F()->V(p.F()->Next(se));
p.FlipE();
vs.push_back(p.F()->V(se)); // Given a facepointer, it build a vector with all the vertex pointer
// around the polygonal face determined by the current FAUX-EDGE markings
int guard = 0; // It assumes that the mesh is 2Manifold and has FF adjacency already computed
do{ // NOTE: All the faces touched are marked as visited. (so for example you can avoid to get twice the same polygon)
while(p.F()->IsF(p.E())) { p.FlipF(); p.FlipE(); p.F()->SetV(); if (guard++>10) break;} static void ExtractPolygon(typename TriMeshType::FacePointer tfp, std::vector<typename TriMeshType::VertexPointer> &vs)
if (guard++>10) break; {
vs.push_back(p.F()->V(p.E())); vs.clear();
p.FlipV(); // find a non tagged edge
p.FlipE(); int se = -1;
} while( p.V() != v0 ); for(int i=0; i<3; i++) if (!( tfp->IsF(i))) { se = i; break;}
}
// all faux edges return an empty vertex vector!
if(se==-1) return;
// initialize a pos on the first non faux edge
typename TriMeshType::VertexPointer v0 = tfp->V(se);
vcg::face::Pos<typename TriMeshType::FaceType> p(tfp,se,v0);
vcg::face::Pos<typename TriMeshType::FaceType> start(p);
do
{
assert(!p.F()->IsF(p.E()));
vs.push_back(p.F()->V(p.E()));
p.FlipE();
while( p.F()->IsF(p.E()) )
{
p.F()->SetV();
p.FlipF();
p.FlipE();
}
p.FlipV();
} while(p!=start);
}
}; // end of struct }; // end of struct
}} // end namespace vcg::tri }} // end namespace vcg::tri