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get birth faces indices in ImportFromPolyMesh function

This commit is contained in:
alemuntoni 2021-07-07 16:45:15 +02:00
parent 0f320aa671
commit a282947a72
1 changed files with 54 additions and 37 deletions
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91
vcg/complex/algorithms/polygon_support.h
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@ -74,46 +74,63 @@ namespace tri {
}
}
/**
Import a trianglemesh from a polygon mesh
**/
static void ImportFromPolyMesh(TriMeshType & tm, PolyMeshType & pm)
{
tri::RequirePolygonalMesh(pm);
std::vector<typename PolyMeshType::CoordType> points;
/**
* @brief Import a trianglemesh from a polygon mesh
* @param tm: output triangle mesh
* @param pm: input polygonal mesh
* @param birthFaces: a mapping that tells, for each face of the triangle mesh,
* which one is its birth face in the polygonal mesh.
*/
static void ImportFromPolyMesh(TriMeshType& tm, PolyMeshType& pm, std::vector<unsigned int>& birthFaces)
{
birthFaces.clear();
birthFaces.reserve(pm.FN()); //at least the same face number of the polymesh
tri::RequirePolygonalMesh(pm);
std::vector<typename PolyMeshType::CoordType> points;
// the vertices are the same, simply import them
PolyVertexIterator vi;
TriVertexIterator tvi = Allocator<TriMeshType>::AddVertices(tm,pm.vert.size());
int cnt = 0;
for(tvi = tm.vert.begin(),vi = pm.vert.begin(); tvi != tm.vert.end(); ++tvi,++vi,++cnt)
if(!(*vi).IsD()) (*tvi).ImportData(*vi); else tri::Allocator<TriMeshType>::DeleteVertex(tm,(*tvi));
// the vertices are the same, simply import them
PolyVertexIterator vi;
TriVertexIterator tvi = Allocator<TriMeshType>::AddVertices(tm,pm.vert.size());
int cnt = 0;
for(tvi = tm.vert.begin(),vi = pm.vert.begin(); tvi != tm.vert.end(); ++tvi,++vi,++cnt)
if(!(*vi).IsD()) (*tvi).ImportData(*vi); else tri::Allocator<TriMeshType>::DeleteVertex(tm,(*tvi));
for(PolyFaceIterator fi = pm.face.begin(); fi != pm.face.end(); ++fi)
{
if(!((*fi).IsD())){
points.clear();
for(int i = 0; i < (*fi).VN(); ++i) {
typename PolyMeshType::VertexType * v = (*fi).V(i);
points.push_back(v->P());
}
std::vector<int> faces;
TessellatePlanarPolygon3(points,faces);
for(size_t i = 0; i<faces.size();i+=3){
TriFaceIterator tfi = Allocator<TriMeshType>::AddFace(tm,
tri::Index(pm,(*fi).V( faces[i+0] )),
tri::Index(pm,(*fi).V( faces[i+1] )),
tri::Index(pm,(*fi).V( faces[i+2] )) );
for(PolyFaceIterator fi = pm.face.begin(); fi != pm.face.end(); ++fi)
{
if(!((*fi).IsD())){
points.clear();
for(int i = 0; i < (*fi).VN(); ++i) {
typename PolyMeshType::VertexType * v = (*fi).V(i);
points.push_back(v->P());
}
std::vector<int> faces;
TessellatePlanarPolygon3(points,faces);
tfi->ImportData(*fi);
// set the F flags
if( (faces[i ]+1)%points.size() != size_t(faces[i+1])) (*tfi).SetF(0);
if( (faces[i+1]+1)%points.size() != size_t(faces[i+2])) (*tfi).SetF(1);
if( (faces[i+2]+1)%points.size() != size_t(faces[i ])) (*tfi).SetF(2);
}
}
}
}
//all the faces we add in tm have as a birth face fi
birthFaces.insert(birthFaces.end(), faces.size()/3, tri::Index(pm, *fi));
for(size_t i = 0; i<faces.size();i+=3){
TriFaceIterator tfi = Allocator<TriMeshType>::AddFace(
tm,
tri::Index(pm,(*fi).V( faces[i+0] )),
tri::Index(pm,(*fi).V( faces[i+1] )),
tri::Index(pm,(*fi).V( faces[i+2] )) );
tfi->ImportData(*fi);
// set the F flags
if( (faces[i ]+1)%points.size() != size_t(faces[i+1])) (*tfi).SetF(0);
if( (faces[i+1]+1)%points.size() != size_t(faces[i+2])) (*tfi).SetF(1);
if( (faces[i+2]+1)%points.size() != size_t(faces[i ])) (*tfi).SetF(2);
}
}
}
}
static void ImportFromPolyMesh(TriMeshType & tm, PolyMeshType & pm)
{
std::vector<unsigned int> dummyVector;
ImportFromPolyMesh(tm, pm, dummyVector);
}
/**