Commit: 54ad5766669a23976b9a9fab379bb44ba740c9be
Author: Campbell Barton
Date: Fri Sep 4 01:56:51 2015 +1000
Branches: master
https://developer.blender.org/rB54ad5766669a23976b9a9fab379bb44ba740c9be
Small tri intersect fails when not normalized
Logic was ok, but would run into precision issues.
===================================================================
M source/blender/blenlib/intern/math_geom.c
===================================================================
diff --git a/source/blender/blenlib/intern/math_geom.c
b/source/blender/blenlib/intern/math_geom.c
index 65625db..feb9f7d 100644
--- a/source/blender/blenlib/intern/math_geom.c
+++ b/source/blender/blenlib/intern/math_geom.c
@@ -1600,8 +1600,9 @@ bool isect_tri_tri_epsilon_v3(
BLI_assert((r_i1 != NULL) == (r_i2 != NULL));
- cross_tri_v3(no_a, UNPACK3(tri_pair[0]));
- cross_tri_v3(no_b, UNPACK3(tri_pair[1]));
+ /* normalizing is needed for small triangles T46007 */
+ normal_tri_v3(no_a, UNPACK3(tri_pair[0]));
+ normal_tri_v3(no_b, UNPACK3(tri_pair[1]));
if (isect_plane_plane_v3(plane_co, plane_no, t_a0, no_a, t_b0, no_b)) {
/**
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