NLA corrupt animation when adding armature strips. #84774

New Issue

Aleksandr · 2021-01-16T13:16:44+01:00

Aleksandr commented

2021-01-16 13:16:44 +01:00

System Information
Operating system: Linux-4.15.0-132-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.102.04

Blender Version
Broken: version: 2.83.10, branch: master, commit date: 2020-12-07 14:09, hash: b439a15544
Worked: (newest version of Blender that worked as expected)

Short description of error

My goal was simple as that: just merge two actions in one. But I found that is impossible and even more of that - this operation corrupt my keys in action. See the video.

1. I do not why NLA didn't work as expected
2. NLA change my action without baking

Same trouble in 2.83.10 and 2.90.

Exact steps for others to reproduce the error
Open my blend file - add strips to NLA - switch on armature in NLA - take in account difference from source action and constrains has same configurations- switch off armature in NLA - open action "Reload" in action editor - check the issue
NLA_Bug.blend
Screencast-2021-01-16_14.45.04.mp4

**System Information** Operating system: Linux-4.15.0-132-generic-x86_64-with-debian-buster-sid 64 Bits Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.102.04 **Blender Version** Broken: version: 2.83.10, branch: master, commit date: 2020-12-07 14:09, hash: `b439a15544` Worked: (newest version of Blender that worked as expected) **Short description of error** My goal was simple as that: just merge two actions in one. But I found that is impossible and even more of that - this operation corrupt my keys in action. See the video. **1.** I do not why NLA didn't work as expected **2.** NLA change my action without baking Same trouble in 2.83.10 and 2.90. **Exact steps for others to reproduce the error** Open my blend file - add strips to NLA - switch on armature in NLA - take in account difference from source action and constrains has same configurations- switch off armature in NLA - open action "Reload" in action editor - check the issue [NLA_Bug.blend](https://archive.blender.org/developer/F9581829/NLA_Bug.blend) [Screencast-2021-01-16_14.45.04.mp4](https://archive.blender.org/developer/F9581830/Screencast-2021-01-16_14.45.04.mp4)

Aleksandr commented

2021-01-16 13:16:44 +01:00

Added subscriber: @viadvena

Philipp Oeser commented

2021-01-26 17:26:05 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-01-26 17:26:05 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2021-01-26 17:26:05 +01:00

Thx for the report and the corresponding video.

NLA didn't work as expected

open action "Reload" in action editor - check the issue

Sorry for not getting it right away, but could you try to explain in a bit more detail what I should be looking at?

which bone specifically behaves differently than before?
or are keyframes altered? timing? spacing?

Sorry if this sounds obvious [ it is not for me - might need more coffee :) ].

Thx for the report and the corresponding video. > NLA didn't work as expected > open action "Reload" in action editor - check the issue Sorry for not getting it right away, but could you try to explain in a bit more detail what I should be looking at? - which bone specifically behaves differently than before? - or are keyframes altered? timing? spacing? Sorry if this sounds obvious [ it is not for me - might need more coffee :) ].

Aleksandr commented

2021-01-27 07:18:51 +01:00

Sure @lichtwerk. This shown in 0:59 of this video. When I switch off armature in NLA bones keeps incorrect poses in keyframes produced by NLA. Before I started use NLA bones have proper poses which I marked in the video.

Philipp Oeser commented

2021-01-28 18:42:18 +01:00

Changed status from 'Needs User Info' to: 'Needs Triage'

Wayde Moss commented

2021-05-13 02:02:46 +02:00

Added subscriber: @wbmoss_dev

Wayde Moss commented

2021-05-13 02:02:46 +02:00

Changed status from 'Needs Triage' to: 'Resolved'

Wayde Moss closed this issue

2021-05-13 02:02:46 +02:00

Wayde Moss self-assigned this 2021-05-13 02:02:46 +02:00

Wayde Moss commented

2021-05-13 02:02:46 +02:00

This is not a bug, just a misunderstanding. The Reload animation has no animation fcurves for the root_CTRL. The Fire animation has root_CTRL animation and it isn't placed at the origin.

Without using the NLA, when you switch actions, properties are not reset to default transforms. Changing between Fire and Reload works as expected. Now, NLA blends vertically, not horizontally and it always resets all animated properties to default values before blending. That means root_CTRL will be placed at the origin for Reload, which some of the arm controls are children of. That seemingly "corrupts" the animation. The fix here is to ensure all controls are keyed before adding the action to the NLA. Or you can place the Reload strip above the Fire strip (so root_CTRL is properly placed), then insert the root_Ctrl keys then you can move the strips to be adjacent again.

This is not a bug, just a misunderstanding. The Reload animation has no animation fcurves for the root_CTRL. The Fire animation has root_CTRL animation and it isn't placed at the origin. Without using the NLA, when you switch actions, properties are not reset to default transforms. Changing between Fire and Reload works as expected. Now, NLA blends vertically, not horizontally and it always resets all animated properties to default values before blending. That means root_CTRL will be placed at the origin for Reload, which some of the arm controls are children of. That seemingly "corrupts" the animation. The fix here is to ensure all controls are keyed before adding the action to the NLA. Or you can place the Reload strip above the Fire strip (so root_CTRL is properly placed), then insert the root_Ctrl keys then you can move the strips to be adjacent again.

Aleksandr commented

2021-05-13 18:32:44 +02:00

@wbmoss_dev Thanks a lot for helping me figure this out! Now all gears are rolling right.

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NLA corrupt animation when adding armature strips. #84774