diff options
Diffstat (limited to 'source/blender/blenlib/intern/arithb.c')
| -rw-r--r-- | source/blender/blenlib/intern/arithb.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/arithb.c b/source/blender/blenlib/intern/arithb.c index ad1dc1ca12c..970d8f7d0de 100644 --- a/source/blender/blenlib/intern/arithb.c +++ b/source/blender/blenlib/intern/arithb.c @@ -2969,6 +2969,19 @@ void VecRotToQuat( float *vec, float phi, float *quat) } } +/* get a direction from 3 vectors that wont depend + * on the distance between the points */ +void Vec3ToTangent(float *v, float *v1, float *v2, float *v3) +{ + float d_12[3], d_23[3]; + VecSubf(d_12, v2, v1); + VecSubf(d_23, v3, v2); + Normalize(d_12); + Normalize(d_23); + VecAddf(v, d_12, d_23); + Normalize(v); +} + /* Return the angle in degrees between vecs 1-2 and 2-3 in degrees If v1 is a shoulder, v2 is the elbow and v3 is the hand, this would return the angle at the elbow */ |