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Fix #21458: tangent space normal maps didn't work correct in some

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cases due to recent fix to avoid division by zero.
This commit is contained in:
Brecht Van Lommel 2010-03-05 15:36:05 +00:00
parent 422241c4e6
commit bf4d8ffe3a
1 changed files with 5 additions and 3 deletions
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8
source/blender/blenlib/intern/math_geom.c
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@ -1852,10 +1852,12 @@ void tangent_from_uv(float *uv1, float *uv2, float *uv3, float *co1, float *co2,
float s2= uv3[0] - uv1[0]; float s2= uv3[0] - uv1[0];
float t1= uv2[1] - uv1[1]; float t1= uv2[1] - uv1[1];
float t2= uv3[1] - uv1[1]; float t2= uv3[1] - uv1[1];
float det= (s1 * t2 - s2 * t1);
if(s1 && s2 && t1 && t2) { /* otherwise 'tang' becomes nan */ if(det != 0.0f) { /* otherwise 'tang' becomes nan */
float tangv[3], ct[3], e1[3], e2[3], det; float tangv[3], ct[3], e1[3], e2[3];
det= 1.0f / (s1 * t2 - s2 * t1);
det= 1.0f/det;
/* normals in render are inversed... */ /* normals in render are inversed... */
sub_v3_v3v3(e1, co1, co2); sub_v3_v3v3(e1, co1, co2);