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don't do collinear test for a triangle to be collapsed

This commit is contained in:
Sébastien Loriot 2023-08-17 15:02:48 +02:00
parent d0b188bf41
commit 5cc58a4080
1 changed files with 2 additions and 1 deletions
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3
Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Snapping/snap.h
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@ -134,6 +134,7 @@ void simplify_range(HalfedgeRange& halfedge_range,
{ {
const halfedge_descriptor prev_h = prev(h, tm); const halfedge_descriptor prev_h = prev(h, tm);
const halfedge_descriptor next_h = next(h, tm); const halfedge_descriptor next_h = next(h, tm);
const halfedge_descriptor prev_oh = prev(opposite(h, tm), tm);
// check that the border has at least 4 edges not to create degenerate volumes // check that the border has at least 4 edges not to create degenerate volumes
if(border_size(h, tm) >= 4) if(border_size(h, tm) >= 4)
@ -156,7 +157,7 @@ void simplify_range(HalfedgeRange& halfedge_range,
bool do_collapse = true; bool do_collapse = true;
for(halfedge_descriptor he : halfedges_around_target(h, tm)) for(halfedge_descriptor he : halfedges_around_target(h, tm))
{ {
if(he != h && if(he != prev_oh && // ignore the triangle incident to h that will disappear
!is_border(he, tm) && !is_border(he, tm) &&
collinear(get(vpm, source(he, tm)), new_p, get(vpm, target(next(he,tm),tm)))) collinear(get(vpm, source(he, tm)), new_p, get(vpm, target(next(he,tm),tm))))
{ {