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Refactored and commented. Now can also cut along non faux edges

This commit is contained in:
Paolo Cignoni 2016-04-02 08:30:24 +00:00
parent a989737e26
commit 298714ccea
1 changed files with 87 additions and 101 deletions
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70
vcg/complex/algorithms/crease_cut.h
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@ -28,68 +28,55 @@
namespace vcg {
namespace tri {
/*
Crease Angle
Assume che:
la mesh abbia la topologia ff
la mesh non abbia complex (o se li aveva fossero stati detached)
Abbia le normali per faccia normalizzate!!
Prende una mesh e duplica tutti gli edge le cui normali nelle facce incidenti formano un angolo maggiore
di <angle> (espresso in rad).
foreach face
foreach unvisited vert vi
scan the star of triangles around vi duplicating vi each time we encounter a crease angle.
the new (and old) vertexes are put in a std::vector that is swapped with the original one at the end.
Si tiene un vettore di interi 3 *fn che dice l'indice del vertice puntato da ogni faccia.
quando si scandisce la stella intorno ad un vertici, per ogni wedge si scrive l'indice del vertice corrsipondente.
/** \brief Open a mesh cutting all the edges where the two faces make an angle *larger* than the indicated threshold
*/
template<class MESH_TYPE>
void CreaseCut(MESH_TYPE &m, float angleRad)
{
typedef typename MESH_TYPE::CoordType CoordType;
typedef typename MESH_TYPE::ScalarType ScalarType;
typedef typename MESH_TYPE::VertexType VertexType;
typedef typename MESH_TYPE::VertexPointer VertexPointer;
typedef typename MESH_TYPE::VertexIterator VertexIterator;
tri::UpdateFlags<MESH_TYPE>::FaceFauxSignedCrease(m, -angleRad, angleRad);
CutMeshAlongNonFauxEdges(m);
}
/**
* \brief Open a mesh along non-faux edges
*
* Duplicate exisiting vertices so that non-faux edges become boundary edges.
* It assume FF topology and manifoldness.
* The idea is that we scan faces around each vertex duplicating it each time we encounter a marked edge.
*
*/
template<class MESH_TYPE>
void CutMeshAlongNonFauxEdges(MESH_TYPE &m)
{
typedef typename MESH_TYPE::FaceIterator FaceIterator;
typedef typename MESH_TYPE::FaceType FaceType;
typedef typename MESH_TYPE::FacePointer FacePointer;
tri::Allocator<MESH_TYPE>::CompactVertexVector(m);
tri::Allocator<MESH_TYPE>::CompactFaceVector(m);
tri::UpdateNormal<MESH_TYPE>::NormalizePerFace(m);
assert(tri::HasFFAdjacency(m));
typename MESH_TYPE::ScalarType cosangle=math::Cos(angleRad);
tri::RequireFFAdjacency(m);
tri::UpdateFlags<MESH_TYPE>::VertexClearV(m);
std::vector<int> indVec(m.fn*3,-1);
int newVertexCounter=m.vn;
int startVn=m.vn;
for(FaceIterator fi=m.face.begin();fi!=m.face.end();++fi)
{
for(int j=0;j<3;++j)
if(!(*fi).V(j)->IsV() ) // foreach unvisited vertex we loop around it searching for creases.
{
(*fi).V(j)->SetV();
face::JumpingPos<FaceType> iPos(&*fi,j,(*fi).V(j));
size_t vertInd = Index(m,iPos.v); //
size_t vertInd = Index(m, iPos.V());
bool isBorderVertex = iPos.FindBorder(); // for border vertex we start from the border.
face::JumpingPos<FaceType> startPos=iPos;
if(!isBorderVertex) // for internal vertex we search the first crease and start from it
{
do {
ScalarType dotProd = iPos.FFlip()->cN().dot(iPos.f->N());
bool creaseFlag = !iPos.IsFaux();
iPos.NextFE();
if(dotProd<cosangle) break;
if(creaseFlag) break;
} while (startPos!=iPos);
startPos=iPos; // the found crease become the new starting pos.
}
@ -98,11 +85,10 @@ void CreaseCut(MESH_TYPE &m, float angleRad)
int curVertexCounter =vertInd;
do { // The real Loop
ScalarType dotProd=iPos.FFlip()->cN().dot(iPos.f->N()); // test normal with the next face (fflip)
size_t faceInd = Index(m,iPos.f);
size_t faceInd = Index(m,iPos.F());
indVec[faceInd*3+ iPos.VInd()] = curVertexCounter;
if(dotProd<cosangle)
if(!iPos.IsFaux())
{ //qDebug(" Crease FOUND");
++locCreaseCounter;
curVertexCounter=newVertexCounter;
@ -111,16 +97,17 @@ void CreaseCut(MESH_TYPE &m, float angleRad)
iPos.NextFE();
} while (startPos!=iPos);
if(locCreaseCounter>0 && (!isBorderVertex) ) newVertexCounter--;
//printf("For vertex %i found %i creases\n",vertInd,locCreaseCounter);
}
} // end foreach face/vert
// A questo punto ho un vettore che mi direbbe per ogni faccia quale vertice devo mettere. Dopo che ho aggiunto i vertici necessari,
// rifaccio il giro delle facce
//qDebug("adding %i vert for %i crease edges ",newVertexCounter-m.vn, creaseCounter);
// Now the indVec vector contains for each the new index of each vertex (duplicated as necessary)
// We do a second loop to copy split vertexes into new positions
tri::Allocator<MESH_TYPE>::AddVertices(m,newVertexCounter-m.vn);
tri::UpdateFlags<MESH_TYPE>::VertexClearV(m);
for(FaceIterator fi=m.face.begin();fi!=m.face.end();++fi)
for(int j=0;j<3;++j) // foreach unvisited vertex
for(int j=0;j<3;++j)
{
size_t faceInd = Index(m, *fi);
size_t vertInd = Index(m, (*fi).V(j));
@ -134,7 +121,6 @@ void CreaseCut(MESH_TYPE &m, float angleRad)
(*fi).V(j) = & m.vert[curVertexInd];
}
}
tri::UpdateNormal<MESH_TYPE>::PerVertexFromCurrentFaceNormal(m);
}
} // end namespace tri