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Added two methods for computing normals of polygonal meshes.

This commit is contained in:
giorgiomarcias 2014-05-20 15:55:58 +00:00
parent 2b3bb02be0
commit 1803989930
1 changed files with 26 additions and 0 deletions
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26
vcg/complex/algorithms/update/normal.h
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@ -165,6 +165,24 @@ static void PerFace(ComputeMeshType &m)
face::ComputeNormal(*f); face::ComputeNormal(*f);
} }
/// \brief computePerPolygonalFace computes the normal of each polygonal face.
///
/// Not normalized. Use PerPolygonalFaceNormalized() or call NormalizePerFace() if you need unit length per face normals.
static void PerPolygonalFace(ComputeMeshType &m) {
// check input type mesh
if (!HasPerFaceNormal(m))
throw vcg::MissingComponentException("PerFaceNormal");
// for each face
for(FaceIterator f = m.face.begin(); f != m.face.end(); f++)
if (!f->IsD()) {
f->N().SetZero();
for (int v = 0; v < f->VN(); v++)
f->N() += f->V(v)->P() ^ f->V((v+1)%f->VN())->P();
}
}
/// \brief Calculates the vertex normal by averaging the current per-face normals. /// \brief Calculates the vertex normal by averaging the current per-face normals.
/** /**
The normal of a vertex v is the average of the un-normalized normals of the faces incident on v. The normal of a vertex v is the average of the un-normalized normals of the faces incident on v.
@ -252,6 +270,14 @@ static void PerFaceNormalized(ComputeMeshType &m)
NormalizePerFace(m); NormalizePerFace(m);
} }
/// \brief Equivalent to PerPolygonalFace() and NormalizePerFace()
static void PerPolygonalFaceNormalized(ComputeMeshType &m) {
// compute normals
PerPolygonalFace(m);
// normalize them
NormalizePerFace(m);
}
/// \brief Equivalent to PerVertex() and PerFace(). /// \brief Equivalent to PerVertex() and PerFace().
static void PerVertexPerFace(ComputeMeshType &m) static void PerVertexPerFace(ComputeMeshType &m)
{ {