utility vector functions for flipping one vector about another:

  nicer then interp_v3_v3v3(v, v1, v2, -1.0f);

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_vector.h b/source/blender/blenlib/BLI_math_vector.h
index f4572afec84..e9217728eae 100644
--- a/source/blender/blenlib/BLI_math_vector.h
+++ b/source/blender/blenlib/BLI_math_vector.h
@@ -171,6 +171,10 @@ void mid_v3_v3v3(float r[3], const float a[3], const float b[3]);
 void mid_v2_v2v2(float r[2], const float a[2], const float b[2]);
 void mid_v3_v3v3v3(float v[3], const float v1[3], const float v2[3], const float v3[3]);
 
+void flip_v4_v4v4(float v[4], const float v1[4], const float v2[4]);
+void flip_v3_v3v3(float v[3], const float v1[3], const float v2[3]);
+void flip_v2_v2v2(float v[2], const float v1[2], const float v2[2]);
+
 /********************************* Comparison ********************************/
 
 MINLINE int is_zero_v3(const float a[3]);