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Improved Documentation for FlipEdge

This commit is contained in:
Paolo Cignoni 2016-12-16 23:54:57 +01:00
parent 32680eac28
commit c0a99c8b3a
1 changed files with 29 additions and 13 deletions
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38
vcg/simplex/face/topology.h
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@ -566,10 +566,10 @@ bool CheckFlipEdgeNormal(FaceType &f, const int z, const float angleRad)
assert((NewDiag1 != NewDiag0) && (NewDiag1 != OldDiag0) && (NewDiag1 != OldDiag1));
CoordType oldN0 = NormalizedNormal( NewDiag0->cP(),OldDiag0->cP(),OldDiag1->cP());
CoordType oldN1 = NormalizedNormal( NewDiag1->cP(),OldDiag1->cP(),OldDiag0->cP());
CoordType newN0 = NormalizedNormal( OldDiag0->cP(),NewDiag1->cP(),NewDiag0->cP());
CoordType newN1 = NormalizedNormal( OldDiag1->cP(),NewDiag0->cP(),NewDiag1->cP());
CoordType oldN0 = Normal( NewDiag0->cP(),OldDiag0->cP(),OldDiag1->cP()).Normalize();
CoordType oldN1 = Normal( NewDiag1->cP(),OldDiag1->cP(),OldDiag0->cP()).Normalize();
CoordType newN0 = Normal( OldDiag0->cP(),NewDiag1->cP(),NewDiag0->cP()).Normalize();
CoordType newN1 = Normal( OldDiag1->cP(),NewDiag0->cP(),NewDiag1->cP()).Normalize();
if(AngleN(oldN0,newN0) > angleRad) return false;
if(AngleN(oldN0,newN1) > angleRad) return false;
if(AngleN(oldN1,newN0) > angleRad) return false;
@ -629,13 +629,28 @@ bool CheckFlipEdge(FaceType &f, int z)
/*!
* Flip the z-th edge of the face f.
* Check for topological correctness first using <CODE>CheckFlipFace()</CODE>.
* Check for topological correctness first using <CODE>CheckFlipEdge()</CODE>.
* \param f pointer to the face
* \param z the edge index
*
* Note: For <em>edge flip</em> we intend the swap of the diagonal of the rectangle
* Note: For <em>edge flip</em> we intend the swap of the diagonal of the quadrilater
* formed by the face \a f and the face adjacent to the specified edge.
*
* 0__________ 2 0__________2
* -> 1|\ | | /|1
* | \ g | | g / |
* | \ | |w / |
* | f z\w | | / f z|
* | \ | | / |
* |__________\|1 <- 1|/__________|
* 2 0 2 0
*
* Note that, after an operation FlipEdge(f,z)
* to topologically revert it should be sufficient to do FlipEdge(f,z+1)
* (even if the mesh is actually different: f and g will be swapped)
*
*/
template <class FaceType>
void FlipEdge(FaceType &f, const int z)
{
@ -644,12 +659,12 @@ void FlipEdge(FaceType &f, const int z)
assert( !IsBorder(f,z) );
assert( face::IsManifold<FaceType>(f, z));
FaceType *g = f.FFp(z);
int w = f.FFi(z);
FaceType *g = f.FFp(z); // The other face
int w = f.FFi(z); // and other side
assert( g->V(w) == f.V1(z) );
assert( g->V1(w)== f.V(z) );
assert( g->V2(w)!= f.V(z) );
assert( g->V0(w) == f.V1(z) );
assert( g->V1(w) == f.V0(z) );
assert( g->V2(w) != f.V0(z) );
assert( g->V2(w) != f.V1(z) );
assert( g->V2(w) != f.V2(z) );
@ -685,6 +700,7 @@ void FlipEdge(FaceType &f, const int z)
g->FFp(w)->FFp( g->FFi(w) ) = g;
g->FFp(w)->FFi( g->FFi(w) ) = w;
}
}
template <class FaceType>