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Math Lib: replace epsilon with check against zero

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line-tri intersection depended on scale, The check made small triangles & lines fail.
So just check for divide by zero as ray-cast currently does.
This commit is contained in:
Campbell Barton
2014-08-17 08:38:24 +10:00
parent fe2b461398
commit f789d0b606
1 changed files with 2 additions and 2 deletions
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4
source/blender/blenlib/intern/math_geom.c
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@@ -977,7 +977,7 @@ bool isect_line_tri_v3(const float p1[3], const float p2[3],
cross_v3_v3v3(p, d, e2);
a = dot_v3v3(e1, p);
if ((a > -0.000001f) && (a < 0.000001f)) return 0;
if (a == 0.0f) return 0;
f = 1.0f / a;
sub_v3_v3v3(s, p1, v0);
@@ -1016,7 +1016,7 @@ bool isect_line_tri_epsilon_v3(const float p1[3], const float p2[3],
cross_v3_v3v3(p, d, e2);
a = dot_v3v3(e1, p);
if ((a > -0.000001f) && (a < 0.000001f)) return 0;
if (a == 0.0f) return 0;
f = 1.0f / a;
sub_v3_v3v3(s, p1, v0);