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Again refactored and commented the ExtractPolygon

This commit is contained in:
Paolo Cignoni 2014-05-21 13:35:54 +00:00
parent 7c93452e94
commit 34fb35c6c7
1 changed files with 20 additions and 13 deletions
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33
vcg/complex/algorithms/polygon_support.h
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@ -148,45 +148,52 @@ namespace tri {
if(tri::HasPerFaceQuality(tm) && tri::HasPerFaceQuality(pm)) pfi->Q()=tfi->Q();
}
}
// Given a facepointer, it build a vector with all the vertex pointer
// around the polygonal face determined by the current FAUX-EDGE markings
// It assumes that the mesh is 2Manifold and has FF adjacency already computed
// NOTE: All the faces touched are marked as visited. (so for example you can avoid to get twice the same polygon)
/// \brief Collect tris and verts of a polygonal face marked by FauxEdges
///
/// Given a face pointer, it builds a vector with all the face and vertex pointers
/// around the polygonal face determined by the current FAUX-EDGE markings.
/// It assumes that the mesh is 2Manifold and has FF adjacency already computed
/// per face visited flag cleared.
/// NOTE: All the faces touched are marked as visited and it assumes that you
/// do not call this function on a visited face.
static void ExtractPolygon(typename TriMeshType::FacePointer tfp,
std::vector<typename TriMeshType::VertexPointer> &vs,
std::vector<typename TriMeshType::FacePointer> &fs)
{
vs.clear();
fs.clear();
// find a non tagged edge
// find a non faux edge
int se = -1;
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;
if(tfp->IsV()) return;
// initialize a pos on the first non faux edge
typename TriMeshType::VertexPointer v0 = tfp->V(se);
face::Pos<typename TriMeshType::FaceType> start(tfp,se,tfp->V(se));
face::Pos<typename TriMeshType::FaceType> p(start);
face::Pos<typename TriMeshType::FaceType> p(tfp,se,v0);
face::Pos<typename TriMeshType::FaceType> start(p);
fs.push_back(p.F());
p.F()->SetV();
do
{
assert(!p.F()->IsF(p.E()));
vs.push_back(p.F()->V(p.E()));
vs.push_back(p.V());
p.FlipE();
while( p.F()->IsF(p.E()) )
{
if(!p.F()->IsV()) fs.push_back(p.F());
p.F()->SetV();
p.FlipF();
if(!p.F()->IsV()) {
fs.push_back(p.F());
p.F()->SetV();
}
p.FlipE();
}
p.FlipV();
} while(p!=start);
assert(vs.size() == fs.size()+2);
}
static void ExtractPolygon(typename TriMeshType::FacePointer tfp, std::vector<typename TriMeshType::VertexPointer> &vs)
{