diff options
Diffstat (limited to 'source/blender/blenlib/intern/math_vector.c')
| -rw-r--r-- | source/blender/blenlib/intern/math_vector.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/math_vector.c b/source/blender/blenlib/intern/math_vector.c index d939576904e..5cda1c0b81f 100644 --- a/source/blender/blenlib/intern/math_vector.c +++ b/source/blender/blenlib/intern/math_vector.c @@ -136,6 +136,19 @@ float angle_v3v3v3(const float v1[3], const float v2[3], const float v3[3]) return angle_normalized_v3v3(vec1, vec2); } +/* Quicker than full angle computation */ +float cos_v3v3v3(const float p1[3], const float p2[3], const float p3[3]) +{ + float vec1[3], vec2[3]; + + sub_v3_v3v3(vec1, p2, p1); + sub_v3_v3v3(vec2, p2, p3); + normalize_v3(vec1); + normalize_v3(vec2); + + return dot_v3v3(vec1, vec2); +} + /* Return the shortest angle in radians between the 2 vectors */ float angle_v3v3(const float v1[3], const float v2[3]) { |