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Solved bug about aliasing when resampling with signed distance thin and long triangles.

This commit is contained in:
Paolo Cignoni 2009-04-10 15:05:49 +00:00
parent 47dc2ecd6c
commit 0c61619049
1 changed files with 23 additions and 12 deletions
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35
vcg/complex/trimesh/create/resampler.h
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@ -177,21 +177,31 @@ template <class OLD_MESH_TYPE,class NEW_MESH_TYPE, class FLT, class DISTFUNCTOR
else assert(0);
assert(retIP); // this should happen only if the starting mesh has degenerate faces.
closestNormV = (f->V(0)->cN())*pip[0] + (f->V(1)->cN())*pip[1] + (f->V(2)->cN())*pip[2] ;
closestNormF = f->cN() ;
const float InterpolationEpsilon = 0.00001f;
int zeroCnt=0;
if(pip[0]<InterpolationEpsilon) ++zeroCnt;
if(pip[1]<InterpolationEpsilon) ++zeroCnt;
if(pip[2]<InterpolationEpsilon) ++zeroCnt;
assert(zeroCnt<3);
Point3f dir=(testPt-closestPt).Normalize();
// Note that the two signs could be discordant.
// Always choose the best one according to where the nearest point falls.
float signBest;
// Compute test if the point see the surface normal from inside or outside
// Surface normal for improved robustness is computed both by face and interpolated from vertices.
float signV = dir.dot(closestNormV) ;
float signF = dir.dot(closestNormF) ;
// Note that the two signs could be discordant.
// Always choose the best one according to the magnitude.
float signBest;
if(fabs(signV) > fabs(signF)) signBest = signV;
else signBest = signF;
if(zeroCnt>0) // we Not are in the middle of the face so the face normal is NOT reliable.
{
closestNormV = (f->V(0)->cN())*pip[0] + (f->V(1)->cN())*pip[1] + (f->V(2)->cN())*pip[2] ;
signBest = dir.dot(closestNormV) ;
}
else
{
closestNormF = f->cN() ;
signBest = dir.dot(closestNormF) ;
}
if(signBest<0) dist=-dist;
@ -320,7 +330,8 @@ template <class OLD_MESH_TYPE,class NEW_MESH_TYPE, class FLT, class DISTFUNCTOR
_oldM=&old_mesh;
// the following two steps are required to be sure that the point-face distance without precomputed data works well.
tri::UpdateNormals<Old_Mesh>::PerVertexNormalizedPerFaceNormalized(old_mesh);
tri::UpdateNormals<Old_Mesh>::PerFaceNormalized(old_mesh);
tri::UpdateNormals<Old_Mesh>::PerVertexAngleWeighted(old_mesh);
tri::UpdateFlags<Old_Mesh>::FaceProjection(old_mesh);
int _size=(int)old_mesh.fn*100;