Animation: Exiting NLA tweak mode on empty action corrupts entire NLA track #102518

New Issue

Colin Basnett · 2022-11-15T06:03:03+01:00

Colin Basnett commented

2022-11-15 06:03:03 +01:00

System Information
Operating system: Windows 11
Graphics card: NVIDIA RTX 3060 Ti

Blender Version
Broken: 3.3.0, 3.5.0
Worked: Unknown

Short description of error

When tweaking a strip on the NLA, if the user deletes all the keyframes of the action being tweaked, when the user exits tweak mode, all other NLA strips on that track will be moved in an unexpected and undesirable way.

tweakbug.mp4

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

Open the attached .blend file
Delete the keyframes on the track being tweaked.
Exit tweak mode by pressing Tab.
Observe that the NLA strips have been moved.

tweakbug.blend

**System Information** Operating system: Windows 11 Graphics card: NVIDIA RTX 3060 Ti **Blender Version** Broken: 3.3.0, 3.5.0 Worked: Unknown **Short description of error** When tweaking a strip on the NLA, if the user deletes all the keyframes of the action being tweaked, when the user exits tweak mode, all other NLA strips on that track will be moved in an unexpected and undesirable way. [tweakbug.mp4](https://archive.blender.org/developer/F13915592/tweakbug.mp4) **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). 1. Open the attached .blend file 2. Delete the keyframes on the track being tweaked. 3. Exit tweak mode by pressing Tab. 4. Observe that the NLA strips have been moved. [tweakbug.blend](https://archive.blender.org/developer/F13915591/tweakbug.blend)

Colin Basnett commented

2022-11-15 06:03:03 +01:00

Added subscriber: @cmbasnett

Brad Clark commented

2022-11-15 16:50:41 +01:00

Added subscriber: @BClark

Brad Clark commented

2022-11-15 16:50:41 +01:00

Is this when Sync is on?

Brad Clark commented

2022-11-15 19:33:49 +01:00

IF you turn off sync length then it works fine, doesn't move.
If it is the first clip on the track and you remove it, the clip goes to 0 but stays on the start frame of the strip.

IF it is the second or a strip that is after another strip on a track, with sync on, then it moves the strip to the end of the previous strip

IF you turn off sync length then it works fine, doesn't move. If it is the first clip on the track and you remove it, the clip goes to 0 but stays on the start frame of the strip. IF it is the second or a strip that is after another strip on a track, with sync on, then it moves the strip to the end of the previous strip

Colin Basnett commented

2022-11-15 20:58:39 +01:00

Thanks for following up and investigating more @RiggingDojo.

It's probably worth it to ask what we even want to happen if the strip's action ends up with no keyframes after tweaking. Should we maybe just remove the strip entirely?

Thanks for following up and investigating more @RiggingDojo. It's probably worth it to ask what we even want to happen if the strip's action ends up with no keyframes after tweaking. Should we maybe just remove the strip entirely?

Philipp Oeser commented

2022-11-18 13:10:17 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-11-18 13:10:17 +01:00

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

Philipp Oeser commented

2022-11-18 13:10:17 +01:00

In #102518#1446441, @BClark wrote:
IF it is the second or a strip that is after another strip on a track, with sync on, then it moves the strip to the end of the previous strip

Why is CubeAction moved as well then?

(will confirm for now, seems unexpected to me -- and also requires a design in regards to what @cmbasnett said [whether to remove empty strips entirely]

> In #102518#1446441, @BClark wrote: > IF it is the second or a strip that is after another strip on a track, with sync on, then it moves the strip to the end of the previous strip Why is `CubeAction` moved as well then? (will confirm for now, seems unexpected to me -- and also requires a design in regards to what @cmbasnett said [whether to remove empty strips entirely]

Brad Clark commented

2022-11-18 16:29:11 +01:00

We discussed this and the strip shouldn't be removed. It should act like it does if it is the only or first strip, if sync is on and keys are removed.

Brad Clark commented

2022-11-18 16:29:52 +01:00

"Why is CubeAction moved as well then?"

That I don't know, I couldn't get that to reproduce.

"Why is CubeAction moved as well then?" That I don't know, I couldn't get that to reproduce.

Philipp Oeser removed the

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Animation: Exiting NLA tweak mode on empty action corrupts entire NLA track #102518