Gimbal/Normal Rotation of bones does not work as expected on bones that have Child Of Constraint #43756
Labels
No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset Browser
Interest
Asset Browser Project Overview
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
EEVEE & Viewport
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
EEVEE & Viewport
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Priority
High
Priority
Low
Priority
Normal
Priority
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
No Milestone
No project
No Assignees
3 Participants
Notifications
Due Date
No due date set.
Dependencies
No dependencies set.
Reference: blender/blender#43756
Loading…
Reference in New Issue
No description provided.
Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Version: 2.73 (Linux 64-bit)
How to reproduce:
It is useful in rigging to use a Child Of constraint to make a bone inherit its rotation from a bone other than its immediate parent (often one further up the bone chain). However It appears that the Gimbal/Normal transform does not take into account the visual transform created by the Child Of constraint. Weirdly, turning on the Location axes for the Child Of constraint seems to solve this problem, however this makes no sense and can cause separate issues for unconnected bones.
How can this be solved?
Example File: RotationTransformBug.blend
Changed status to: 'Open'
Added subscriber: @rocketman
Added subscribers: @mont29, @JulianEisel
This is caused by
61d1477415
. I don't know much about this rigging stuff, but it seems that the current behaviour is exactly what is wanted and the mentioned commit makes sure this is the case, or this is just one of the corner cases/limitation which can't be handled correctly, as Bastien described in the commit log. So the Oscar goes to @mont29 :) He should know how it's supposed to work.Changed status from 'Open' to: 'Archived'
That kind of stuff is just not supported when using partial parenting… Our constraint system needs a complete rework, this is an old known TODO, currently is is just not always possible to get a valid inverse of constraint's transform in complex spaces/transformations (we'd need a dynamic callback, instead of a mere static matrix). As we saw here with
61d1477415
, fixing one case breaks another one…