NLA Solo/Muting doesn't force rest pose on muted tracks #87487
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Reference: blender/blender#87487
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GT 710/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.65
Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash:
02948a2cabWorked: (newest version of Blender that worked as expected)
Short description of error
In case of no key frames in the solo track, the armature should go to the rest pose because the other key frames in the other "muted" tracks must have no effect at all.
Instead, the bones positions and rotation is stuck at the frame where I pressed the star icon. Or maybe they keep their visual position and rotation at the frame where I pressed the start icon.
It only works properly for the Orange action (the Edited action). I mean the action that has not been pushed down yet. Otherwise, it doesn't go to the rest pose.
Exact steps for others to reproduce the error
Download my file. You may have a look at the rest pose so that you know the original pose which has the shape of T.
Note: Each action is related to a specific arm and the orange action (edited action) is related to the most upper bone in the base (vertical) spine.
My file: bug of start solo.blend
Added subscriber: @MikeBlenderLover
Added subscriber: @wilsonharry
This comment was removed by @wilsonharry
Added subscriber: @dfelinto
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Sorry this has been lying around for some time.
I can confirm the behavior (though it has been like that for ages).
The same is true for muting even (same effect: pose of muted track is kept, not returning to restpose).
The system of evaluating the nla stack works by collecting a bunch of channels that are touched by unmuted tracks/actions and then flushes those.
At no point are we "starting" from the rest pose and build up on it.
As a result, poses that are not touched by unmuted tracks/actions just remain as they were.
This might very well be a conscious decision (e.g. for performance reasons), but to me this is unexpected behavior (this is not what I would expect from a
mute/solosystem).Therefor, I will set this to confirmed,
Animation/Riggingmodule might decide to close this as working as designed...Solo (Star Icon) doesn't force rest pose.to NLA Solo/Muting doesn't force rest pose on muted tracksAdded subscriber: @wbmoss_dev
@wbmoss_dev : is this expected behavior?
Added subscriber: @LucianoMunoz
FYI, here is a response from @LucianoMunoz (basically: this is expected behavior):
https://blender.chat/channel/animation-module?msg=EwGGDfQvFww2fqtLZ
Its totally what I would expect, If I want to go to rest pose there is a button for that.
on top of that, this is useful behaviour.
Changed status from 'Confirmed' to: 'Needs Developer To Reproduce'
OK, maybe this is not a bug then.
Will set to
Needs Information from Developersto get a confirming opinion on that.This is the intended behavior, and is consistent with how animation behaves elsewhere in Blender. Even outside of the NLA, when animation is muted, deleted, etc., the pose/transforms/values remain.