Regression: Can no longer set evaluated data in python for attributes #113621

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Jacob Merrill · 2023-10-12T18:13:27+02:00

Jacob Merrill commented

2023-10-12 18:13:27 +02:00

System Information
Operating system: win 11
Graphics card: Nvidia 3060

Blender Version
Broken: 4.1
Worked:4.0
Short description of error
using a modal operator or upbge in the past - if we set evaluated attributes they would propigate into a sim
allowing interaction - now it's now working.

Exact steps for others to reproduce the error
start timeline to run sim - start modal and left click
in 4.0 the particle moves - not in 4.1

**System Information** Operating system: win 11 Graphics card: Nvidia 3060 **Blender Version** Broken: 4.1 Worked:4.0 **Short description of error** using a modal operator or upbge in the past - if we set evaluated attributes they would propigate into a sim allowing interaction - now it's now working. **Exact steps for others to reproduce the error** start timeline to run sim - start modal and left click in 4.0 the particle moves - not in 4.1

modal_test.blend

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2023-10-12 09-12-06.mp4

5.5 MiB

Jacob Merrill added the

labels 2023-10-12 18:13:27 +02:00

Richard Antalik commented

2023-10-12 23:43:55 +02:00

The script doesn't seem to work in 4.0 here either.
With cube selected I get:

Python: Traceback (most recent call last):
  File "/home/me/Desktop/bugs/113621.blend/operator_modal.py", line 20, in modal
AttributeError: 'NoneType' object has no attribute 'attributes'

The script doesn't seem to work in 4.0 here either. With cube selected I get: ``` Python: Traceback (most recent call last): File "/home/me/Desktop/bugs/113621.blend/operator_modal.py", line 20, in modal AttributeError: 'NoneType' object has no attribute 'attributes' ```

Jacob Merrill commented

2023-10-13 01:04:45 +02:00

the cube is a single vertex on the scene (not the empty)

here it is working in LTS 3.6

the cube is a single vertex on the scene (not the empty) here it is working in LTS 3.6

2023-10-12 16-03-49.mp4

1.7 MiB

Jacob Merrill commented

2023-10-13 01:05:36 +02:00

space bar to start sim - click modal operator - left click to push - 'Run' will appear in bottom of screen when it 'pushes'

Jacob Merrill commented

2023-10-14 00:16:37 +02:00

@iss can we poke the simulation module*

Richard Antalik commented

2023-10-14 01:09:28 +02:00

Ah somehow I missed instruction to start playback... I can confirm script working in 3.6. From looking at the code and node setup it looks, like it should work, so will confirm.

Richard Antalik added

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labels 2023-10-14 01:09:43 +02:00

Iliya Katushenock commented

2023-10-14 13:57:30 +02:00

Why you try to write data to evaluated object? This will be deleted and re evaluated on next update call.

Jacob Merrill commented

2023-10-14 21:04:53 +02:00

to interact with running simulation using a modal operator or to use py to basically run a sim yourself and cache it.

I use UPBGE at the moment instead of a modal operator but the concept is the same.

(this scene is not using bullet physics at all* I am using geometry nodes)

we have openXR for input and the modal system now*

to interact with running simulation using a modal operator or to use py to basically run a sim yourself and cache it. I use UPBGE at the moment instead of a modal operator but the concept is the same. (this scene is not using bullet physics at all* I am using geometry nodes) we have openXR for input and the modal system now*

2023-10-14 12-03-17.mp4

5.2 MiB

Jacob Merrill changed title from ~~Can no longer set evaluated data in python for attributes~~ to Regression: Can no longer set evaluated data in python for attributes

2023-10-15 19:13:01 +02:00

Jacob Merrill commented

2023-10-15 19:13:50 +02:00

in a sim - the evaluated data from this frame becomes the initial values for the next frame @mod_moder

Hans Goudey commented

2023-10-16 14:45:43 +02:00

This is most likely a change from 34b4487844.
The fact that you could write to an evaluated geometry and change the original was a bug though, so this is expected.
Thanks anyway for the report.

This is most likely a change from 34b44878449d67a56fd2a2b850cb04af5a23ca56. The fact that you could write to an evaluated geometry and change the original was a bug though, so this is expected. Thanks anyway for the report.

Hans Goudey closed this issue

2023-10-16 14:45:46 +02:00

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labels 2023-10-16 14:45:56 +02:00

Jacob Merrill commented

2023-10-16 14:48:58 +02:00

Since input is not wrapped - I wrapped it myself and now that is gone.

now we have no way to interact with a running sim in a modal operator
(I guess we can set inputs on another mesh - but I am back to workarounds.....)

Since input is not wrapped - I wrapped it myself and now that is gone. now we have no way to interact with a running sim in a modal operator (I guess we can set inputs on another mesh - but I am back to workarounds.....)

Jacob Merrill reopened this issue

2023-10-16 14:49:01 +02:00

Blender Bot added

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labels 2023-10-16 14:49:03 +02:00

Iliya Katushenock commented

2023-10-16 14:53:07 +02:00

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

Iliya Katushenock closed this issue

2023-10-16 14:53:10 +02:00

Blender Bot added

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labels 2023-10-16 14:53:13 +02:00

Jacob Merrill commented

2023-10-16 15:38:00 +02:00

For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug

functionality that existed was removed.

it was a bug*

> For more information on why this isn't considered a bug, visit: https://wiki.blender.org/wiki/Reference/Not_a_bug functionality that existed was removed. it was a bug*

Jacob Merrill commented

2023-10-16 19:43:45 +02:00

a feature was removed that was working between versions without discussion - this is a regression*

I have a resolution - perhaps only use evaluated attributes if the evaluated object is tagged to be used

eval_ob.update_tag()

bpy.types.ID.update_tag *

a feature was removed that was working between versions without discussion - this is a regression* I have a resolution - perhaps only use evaluated attributes if the evaluated object is tagged to be used eval_ob.update_tag() bpy.types.ID.update_tag *

Jacob Merrill reopened this issue

2023-10-16 19:43:48 +02:00

Iliya Katushenock closed this issue

2023-10-16 19:44:14 +02:00

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labels 2023-10-16 19:44:44 +02:00

Jacob Merrill commented

2023-10-16 20:48:12 +02:00

@ideasman42 / py module owner - do we not want I/O from python to simulations?

Jacob Merrill commented

2023-10-17 02:25:08 +02:00

can we just merge this and close it into #112150 ??

can we just merge this and close it into https://projects.blender.org/blender/blender/issues/112150 ??

Philipp Oeser commented

2023-10-17 09:37:03 +02:00

@JacobMerrill-1 : this is already referenced from #112150

I will tag it as a duplicate as well, but for gitea, there will be no "real" connection between the two reports other than the reference that is already there...)

@JacobMerrill-1 : this is already referenced from #112150 ![image](/attachments/698927ba-076e-4853-9c41-f4de6ecb38d6) I will tag it as a duplicate as well, but for gitea, there will be no "real" connection between the two reports other than the reference that is already there...)

image.png

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Philipp Oeser added

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Hans Goudey commented

2023-10-17 09:38:10 +02:00

This is not a duplicate of #112150, they are unrelated.

Hans Goudey added

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labels 2023-10-17 09:38:29 +02:00

Philipp Oeser commented

2023-10-17 09:47:27 +02:00

This is not a duplicate of #112150, they are unrelated.

Ah, eh... yeah, not a duplicate. Coffee, please :)

> This is not a duplicate of #112150, they are unrelated. Ah, eh... yeah, not a duplicate. Coffee, please :)

Jacob Merrill commented

2023-10-17 14:16:39 +02:00

#111514 says that #112150 is the fix for this is - how is that unrelated @HooglyBoogly ?

https://projects.blender.org/blender/blender/pulls/111514 says that https://projects.blender.org/blender/blender/issues/112150 is the fix for this is - how is that unrelated @HooglyBoogly ?

Jacques Lucke referenced this issue

2024-02-06 11:52:05 +01:00

Blender LTS: Maintenance Task 3.6 #109399

Pratik Borhade referenced this issue

2024-02-06 12:11:43 +01:00

Cannot undo python opeartor that writes to curve attribute - if #114173

Philipp Oeser referenced this issue

2024-02-14 12:15:30 +01:00

Fix #109670: attribute shared between geometries even when edited (backport to 3.6) #115234

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