diff options
Diffstat (limited to 'source/blender/blenlib/intern/math_geom.c')
| -rw-r--r-- | source/blender/blenlib/intern/math_geom.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/math_geom.c b/source/blender/blenlib/intern/math_geom.c index 3a0187584ff..a360148182d 100644 --- a/source/blender/blenlib/intern/math_geom.c +++ b/source/blender/blenlib/intern/math_geom.c @@ -50,6 +50,21 @@ void cent_quad_v3(float cent[3], const float v1[3], const float v2[3], const flo cent[2] = 0.25f * (v1[2] + v2[2] + v3[2] + v4[2]); } +void cross_tri_v3(float n[3], const float v1[3], const float v2[3], const float v3[3]) +{ + float n1[3], n2[3]; + + n1[0] = v1[0] - v2[0]; + n2[0] = v2[0] - v3[0]; + n1[1] = v1[1] - v2[1]; + n2[1] = v2[1] - v3[1]; + n1[2] = v1[2] - v2[2]; + n2[2] = v2[2] - v3[2]; + n[0] = n1[1] * n2[2] - n1[2] * n2[1]; + n[1] = n1[2] * n2[0] - n1[0] * n2[2]; + n[2] = n1[0] * n2[1] - n1[1] * n2[0]; +} + float normal_tri_v3(float n[3], const float v1[3], const float v2[3], const float v3[3]) { float n1[3], n2[3]; |