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add calc_normal method for all elements returning calc_face_normal, average of vertex normals, calc_halfedge_normal, and calc_vertex_normal_correct respectively

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This commit is contained in:
Max Lyon
2019-12-06 11:16:34 +01:00
parent a1a82331e3
commit 6284fb4fc9
2 changed files with 48 additions and 0 deletions
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17
src/OpenMesh/Core/Mesh/PolyMeshT.hh
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@@ -271,6 +271,10 @@ public:
/** Calculate normal vector for face (_p0, _p1, _p2). */
Normal calc_face_normal(const Point& _p0, const Point& _p1,
const Point& _p2) const;
/// same as calc_face_normal
Normal calc_normal(FaceHandle _fh) const;
/// calculates the average of the vertices defining _fh
void calc_face_centroid(FaceHandle _fh, Point& _pt) const {
_pt = calc_face_centroid(_fh);
@@ -323,6 +327,8 @@ public:
*/
virtual Normal calc_halfedge_normal(HalfedgeHandle _heh, const double _feature_angle = 0.8) const;
/// same as calc_halfedge_normal
Normal calc_normal(HalfedgeHandle, const double _feature_angle = 0.8) const;
/** identifies feature edges w.r.t. the minimal dihedral angle for feature edges (in radians) */
/** and the status feature tag */
@@ -368,6 +374,8 @@ public:
void calc_vertex_normal_correct(VertexHandle _vh, Normal& _n) const;
void calc_vertex_normal_loop(VertexHandle _vh, Normal& _n) const;
/// same as calc_vertex_normal_correct
Normal calc_normal(VertexHandle _vh) const;
//@}
@@ -437,6 +445,15 @@ public:
return calc_edge_midpoint(this->halfedge_handle(_eh, 0));
}
/// calculated and returns the average of the two vertex normals
Normal calc_normal(EdgeHandle _eh) const
{
HalfedgeHandle _heh = this->halfedge_handle(_eh, 0);
VertexHandle vh0 = this->from_vertex_handle(_heh);
VertexHandle vh1 = this->to_vertex_handle(_heh);
return 0.5 * (this->calc_normal(vh0) + this->calc_normal(vh1));
}
/** defines a consistent representation of a sector geometry:
the halfedge _in_heh defines the sector orientation
the vertex pointed by _in_heh defines the sector center