Blender Git Commit Log

Git Commits -> Revision b5c3f26

Revision b5c3f26 by Alexander Gavrilov (master)
January 18, 2021, 17:08 (GMT)
Armature: fix B-Bone deformation blending artifacts with Preserve Volume.

The double quaternion blending method in addition to the deformation
matrix of each bone requires their rest matrices. For ordinary bones
this literally should use the bone rest matrix without any ambiguity.

However, it was also using the bone rest matrix for all of its
B-Bone segments, which is incorrect and causes strange deformation
in some cases involving extreme non-uniform scale, especially
at boundaries between different B-Bones. There is also a similar
known issue that happens with scale at bending joints, and this
fix reduces the distortion when both bones are B-Bones.

This changes both the Armature modifier and the Armature constraint
to use the actual segment rest matrices. Unlike bones, these can have
scale even in rest pose, so normalization is required.

Differential Revision: https://developer.blender.org/D10003

Commit Details:

Full Hash: b5c3f26cba81c969a42255e689a26c1b7c89115b
Parent Commit: 5e0ef4e
Lines Changed: +26, -9

2 Modified Paths:

/source/blender/blenkernel/intern/armature.c (+5, -1) (Diff)
/source/blender/blenkernel/intern/constraint.c (+21, -8) (Diff)
By: Miika HämäläinenLast update: Nov-07-2014 14:18MiikaHweb | 2003-2021