Blender Git Commit Log

Git Commits -> Revision a0e2370

October 15, 2021, 10:21 (GMT)
Fix precision issues and a bug in vec_roll_to_mat3_normalized.

When the input vector gets close to -Y, y and theta becomes totally
unreliable. It is thus necessary to compute the result in a different
way based on x and z. The code already had a special case, but:

- The threshold for using the special case was way too low.
- The special case was not precise enough to extend the threshold.
- The special case math had a sign error, resulting in a jump.

This adds tests for the computation precision and fixes the issues
by adjusting the threshold, and replacing the special case with one
based on a quadratic Taylor expansion of sqrt instead of linear.

Replacing the special case fixes the bug and results in a compatibility
break, requiring versioning for the roll of affected bones.

Differential Revision:

Commit Details:

Full Hash: a0e23700707ffecd7818ef8f0874eefbc81561c5
Parent Commit: e2cb81a
Lines Changed: +203, -25

4 Modified Paths:

/source/blender/blenkernel/BKE_blender_version.h (+1, -1) (Diff)
/source/blender/blenkernel/intern/armature.c (+25, -20) (Diff)
/source/blender/blenkernel/intern/ (+63, -4) (Diff)
/source/blender/blenloader/intern/versioning_300.c (+114, -0) (Diff)
By: Miika HämäläinenLast update: Nov-07-2014 14:18MiikaHweb | 2003-2021