Math Lib: signed versions of quaternion angle

There was no simple way to get the shortest quaternion angle.

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_math_rotation.h b/source/blender/blenlib/BLI_math_rotation.h
index e059327a490..1f206e5e234 100644
--- a/source/blender/blenlib/BLI_math_rotation.h
+++ b/source/blender/blenlib/BLI_math_rotation.h
@@ -97,6 +97,11 @@ float angle_normalized_qtqt(const float q1[4], const float q2[4]);
 float angle_qt(const float q[4]);
 float angle_qtqt(const float q1[4], const float q2[4]);
 
+float angle_signed_normalized_qt(const float q[4]);
+float angle_signed_normalized_qtqt(const float q1[4], const float q2[4]);
+float angle_signed_qt(const float q[4]);
+float angle_signed_qtqt(const float q1[4], const float q2[4]);
+
 /* TODO: don't what this is, but it's not the same as mat3_to_quat */
 void mat3_to_quat_is_ok(float q[4], float mat[3][3]);