Wierd behaviour on UI List update on baked action #121307

New Issue

blenderboi · 2024-05-01T16:26:59+02:00

blenderboi commented

2024-05-01 16:26:59 +02:00

System Information
Operating system: Linux-6.8.7-arch1-2-x86_64-with-glibc2.39 64 Bits, WAYLAND UI
Graphics card: Mesa Intel(R) UHD Graphics 630 (CFL GT2) Intel 4.6 (Core Profile) Mesa 24.0.6-arch1.2

Blender Version
Broken: version: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: e1743a0317bc
Worked: (newest version of Blender that worked as expected)

Short description of error
I encounter a very wierd problem, after baked my actions with anim_utils baking function, the actions become "bugged out" when use in very specific way in script

when I have a property group with a pointer property pointing to Action type, when use with collection property and UIList, and if I use update function for index on the UIList, if i change the action to the "bugged out" action, when I click in UI list, it will act unexpectedly

Exact steps for others to reproduce the error

here is the step

Download and open the Blend Flle
Run the Script in the Blend File
Go to Properties -> Object -> UIList Panel
---- Problem here ----
Click each Item in the list, the expected behaviour is that the object should switch its action to the action in the list and the active index should be the clicked slot, but the active index behave unpredictably
Try changing up the action in the list, or adding more item to the list and click around, this only happen on some of the action
The Action that have problem are baked using function from bpy_extras.anim_utils

You can refer to the attached video for more context

**System Information** Operating system: Linux-6.8.7-arch1-2-x86_64-with-glibc2.39 64 Bits, WAYLAND UI Graphics card: Mesa Intel(R) UHD Graphics 630 (CFL GT2) Intel 4.6 (Core Profile) Mesa 24.0.6-arch1.2 **Blender Version** Broken: version: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: `e1743a0317bc` Worked: (newest version of Blender that worked as expected) **Short description of error** I encounter a very wierd problem, after baked my actions with anim_utils baking function, the actions become "bugged out" when use in very specific way in script when I have a property group with a pointer property pointing to Action type, when use with collection property and UIList, and if I use update function for index on the UIList, if i change the action to the "bugged out" action, when I click in UI list, it will act unexpectedly **Exact steps for others to reproduce the error** here is the step 1. Download and open the Blend Flle 2. Run the Script in the Blend File 3. Go to Properties -> Object -> UIList Panel ---- Problem here ---- 4. Click each Item in the list, the expected behaviour is that the object should switch its action to the action in the list and the active index should be the clicked slot, but the active index behave unpredictably 5. Try changing up the action in the list, or adding more item to the list and click around, this only happen on some of the action 6. The Action that have problem are baked using function from bpy_extras.anim_utils You can refer to the attached video for more context

bug.mp4

6.5 MiB

BugTest.blend

1.1 MiB

👀 1

blenderboi added the

labels 2024-05-01 16:27:00 +02:00

Sybren A. Stüvel commented

2024-05-01 18:55:48 +02:00

Please write out the steps to reproduce. It is much more time-consuming to watch a video, pause it, scrub back & forth, etc. than it is to read some text.

Also videos cannot be indexed by the search engine, so people won't be able to find your description when searching for it.

the actions become "bugged out"

It would help to have a more objective description of the issue.

when use in very specific way in script

It would help to know what this specific way is.

Please write out the steps to reproduce. It is much more time-consuming to watch a video, pause it, scrub back & forth, etc. than it is to read some text. Also videos cannot be indexed by the search engine, so people won't be able to find your description when searching for it. > the actions become "bugged out" It would help to have a more objective description of the issue. > when use in very specific way in script It would help to know what this specific way is.

Brad Clark commented

2024-05-01 21:09:40 +02:00

:) Already asked him to write out the steps, he said he will.

blenderboi commented

2024-05-01 23:12:32 +02:00

Sorry for the trouble

here is the step

Download and open the Blend Flle
Run the Script in the Blend File
Go to Properties -> Object -> UIList Panel
---- Problem here ----
Click each Item in the list, the expected behaviour is that the object should switch its action to the action in the list and the active index should be the clicked slot, but the active index behave unpredictably
Try changing up the action in the list, or adding more item to the list and click around, this only happen on some of the action
The Action that have problem are baked using function from bpy_extras.anim_utils

I hope that is descriptive enough

Sorry for the trouble here is the step 1. Download and open the Blend Flle 2. Run the Script in the Blend File 3. Go to Properties -> Object -> UIList Panel ---- Problem here ---- 4. Click each Item in the list, the expected behaviour is that the object should switch its action to the action in the list and the active index should be the clicked slot, but the active index behave unpredictably 5. Try changing up the action in the list, or adding more item to the list and click around, this only happen on some of the action 6. The Action that have problem are baked using function from bpy_extras.anim_utils I hope that is descriptive enough

Sybren A. Stüvel commented

2024-05-02 12:18:18 +02:00

It took some digging, but I found the culprit. Baking the custom properties also bakes the current value of object.action_settings_index. So switching to the baked action will immediately switch back to whatever was assigned to action_settings_index at the time of baking. Action1 also animated that property, so switching to that one will also potentially cause an immediate switch to another slot.

This is not an issue with Blender. Hope the analysis helps ;-)

It took some digging, but I found the culprit. Baking the custom properties also bakes the current value of `object.action_settings_index`. So switching to the baked action will immediately switch back to whatever was assigned to `action_settings_index` at the time of baking. `Action1` also animated that property, so switching to that one will also potentially cause an immediate switch to another slot. This is not an issue with Blender. Hope the analysis helps ;-)

Sybren A. Stüvel closed this issue

2024-05-02 12:18:22 +02:00

Blender Bot added

and removed

labels 2024-05-02 12:18:23 +02:00

blenderboi commented

2024-05-02 13:26:41 +02:00

Ahh, Thank you very much

blenderboi commented

2024-05-02 13:46:40 +02:00

If the Property is do not have {"ANIMATABLE"} and bake action bake that property, would that be consider a bug?

Sybren A. Stüvel commented

2024-05-02 14:13:23 +02:00

I'd say so, yes. Please report :)

Fin O'Riordan commented

2024-05-02 15:00:23 +02:00

I think {"ANIMATABLE"} is the default

Sybren A. Stüvel commented

2024-05-03 15:24:20 +02:00

Hence the request for a separate bug report (because it's another issue) -- then we can also double-check that the properties in question really have that flag explicitly cleared, and we have a clear example file that we can use as a basis for automated tests to prevent this from happening in the future.

Brad Clark commented

2024-05-03 16:40:39 +02:00

This thread by the way is a great example of why it is important to properly log something, to the follow up work and then continue to explore until it is resolved to help everyone.

blenderboi commented

2024-05-04 01:09:52 +02:00

#121349

I Already made the separate bug report, not sure if I should share it here

Sometimes i'm a little hesitant to post bug report as I can't tell if its a expected behaviour, or a bug, or just purely my mistake

https://projects.blender.org/blender/blender/issues/121349 I Already made the separate bug report, not sure if I should share it here Sometimes i'm a little hesitant to post bug report as I can't tell if its a expected behaviour, or a bug, or just purely my mistake

Sybren A. Stüvel commented

2024-05-06 10:40:04 +02:00

@blenderboi2018 if you think it's a bug, it's usually best to just report it as one. It's easy to close a report as duplicate of another, but it's much harder to disentangle a single report that's actually trying to discuss multiple issues at the same time.

And also you're always welcome in #animation-module on Blender Chat to check whether the issue you're facing is really a bug report. If it's simple to answer you'll get an answer, and sometimes the answer might be "please report it so that we can have a better look" :)

@blenderboi2018 if you think it's a bug, it's usually best to just report it as one. It's easy to close a report as duplicate of another, but it's much harder to disentangle a single report that's actually trying to discuss multiple issues at the same time. And also you're always welcome in [#animation-module on Blender Chat](https://blender.chat/channel/animation-module) to check whether the issue you're facing is really a bug report. If it's simple to answer you'll get an answer, and sometimes the answer might be "please report it so that we can have a better look" :)

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Wierd behaviour on UI List update on baked action #121307