Sybren A. Stüvel
0342fb5d20
Fix division by zero when `BKE_bone_parent_transform_invert()` inverts a scale vector with zero components. Zero values in the to-be-inverted vector are now simply skipped, i.e. remain zero after inversion. This at least ensures that `invert_v3_safe(invert_v3_safe(vector))` results in the same vector. This commit does NOT fix the conceptual problem that an inversion of a potentially non-invertible vector is relied upon. It just avoids the division by zero.