Can not get eval obj's attribute in get/set function #99964

New Issue

yonghao lv · 2022-07-25T12:35:40+02:00

yonghao lv commented

2022-07-25 12:35:40 +02:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.96

Blender Version
Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-07-24 19:33, hash: 6db059e3d7
Worked: 3.2.1 / 3.3.0 7-10 build

Short description of error
2022-07-25 18-23-39.mp4

when using this script to get object's attribute in a property's get/set function, it didn't work

def get_mesh_obj_attrs(context, obj, deps=None) -> dict:
    """

    :param obj:bpy.types.Object
    :param attr:
    :return:list
    """
    attr_dict = dict()

    depsg_eval = deps if deps else context.evaluated_depsgraph_get()  # deps 由外部传入，防止冻结
    depsg_eval.update()
    obj_eval = obj.evaluated_get(depsg_eval)

    for name, attr in obj_eval.data.attributes.items():
        attr_data = attr.data
        attr_dict[name] = [v.value for v in attr_data.values()]

    print(attr_dict)

    return attr_dict

Exact steps for others to reproduce the error
I need some time to clean up the code and upload the smallest file

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.96 **Blender Version** Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-07-24 19:33, hash: `6db059e3d7` Worked: 3.2.1 / 3.3.0 7-10 build **Short description of error** [2022-07-25 18-23-39.mp4](https://archive.blender.org/developer/F13314736/2022-07-25_18-23-39.mp4) when using this script to get object's attribute in a property's get/set function, it didn't work ``` def get_mesh_obj_attrs(context, obj, deps=None) -> dict: """ :param obj:bpy.types.Object :param attr: :return:list """ attr_dict = dict() depsg_eval = deps if deps else context.evaluated_depsgraph_get() # deps 由外部传入，防止冻结 depsg_eval.update() obj_eval = obj.evaluated_get(depsg_eval) for name, attr in obj_eval.data.attributes.items(): attr_data = attr.data attr_dict[name] = [v.value for v in attr_data.values()] print(attr_dict) return attr_dict ``` **Exact steps for others to reproduce the error** I need some time to clean up the code and upload the smallest file

yonghao lv commented

2022-07-25 12:35:40 +02:00

Added subscriber: @1029910278

Germano Cavalcante commented

2022-07-26 00:21:44 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-07-26 00:21:44 +02:00

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

Germano Cavalcante commented

2022-07-26 00:21:44 +02:00

Thanks for the report, but in order to forward it to the developers, we need a reliable way to reproduce the issue.

So please provide a simple .blend file or script showing the problem.

A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Thanks for the report, but in order to forward it to the developers, we need a reliable way to reproduce the issue. So please provide a simple .blend file or script showing the problem. A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

yonghao lv commented

2022-07-27 06:16:39 +02:00

The first test file from my code. I am not sure it cause this error directly, it work fine in my addon but crash blender when select a object(to read its attribute) here
ERROR (bpy.rna): C:\Users\blender\git\blender-vdev\blender.git\source\blender\python\intern\bpy_rna.c:7392 pyrna_srna_Subtype: failed to register 'Attribute'

Reproduce

run the script
select the last mesh object
get_geo_obj_attr.blend
get_geo_obj_attr.crash.txt

I will write a get/set examle later

The first test file from my code. I am not sure it cause this error directly, it work fine in my addon but crash blender when select a object(to read its attribute) here `ERROR (bpy.rna): C:\Users\blender\git\blender-vdev\blender.git\source\blender\python\intern\bpy_rna.c:7392 pyrna_srna_Subtype: failed to register 'Attribute'` Reproduce 1. run the script 2. select the last mesh object [get_geo_obj_attr.blend](https://archive.blender.org/developer/F13321214/get_geo_obj_attr.blend) [get_geo_obj_attr.crash.txt](https://archive.blender.org/developer/F13321215/get_geo_obj_attr.crash.txt) I will write a get/set examle later

yonghao lv commented

2022-07-27 07:21:22 +02:00

The second file, this is how it work get_geo_obj_attr2.blend

run the script
go to console to slide the test value
select the 'Cube', you can see its value print in console
select the 'Cube.001' who reference from a curve object , it will not get the attribute in console (nodegroup: transfrom attribute from curve to mesh by index, it works well in 3.2)

PS: I set the depsgragh to a global value becauese I found that if I call 2 context.eval_depsgraph_get at a same time will freeze blender forver (like 2 drawing function call at the same time)

The second file, this is how it work [get_geo_obj_attr2.blend](https://archive.blender.org/developer/F13321385/get_geo_obj_attr2.blend) 1. run the script 2. go to console to slide the test value 3. select the 'Cube', you can see its value print in console 4. select the 'Cube.001' who reference from a curve object , it will not get the attribute in console (nodegroup: transfrom attribute from curve to mesh by index, it works well in 3.2) PS: I set the depsgragh to a global value becauese I found that if I call 2 context.eval_depsgraph_get at a same time will freeze blender forver (like 2 drawing function call at the same time)

Germano Cavalcante commented

2022-07-28 16:09:44 +02:00

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

Omar Emara commented

2022-08-02 09:24:35 +02:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-08-02 09:24:35 +02:00

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

Omar Emara commented

2022-08-02 09:24:35 +02:00

In your second file, if I connect the Domain Size node to the bezier curve geometry output, it prints the attributes as expected. Could this be the issue or was this just a mistake while preparing the file?

Regardless, I don't think using with contexts and depsgraphs in RNA setter and getter functions is safe.

In your second file, if I connect the Domain Size node to the bezier curve geometry output, it prints the attributes as expected. Could this be the issue or was this just a mistake while preparing the file? Regardless, I don't think using with contexts and depsgraphs in RNA setter and getter functions is safe.

yonghao lv commented

2022-08-05 22:19:02 +02:00

oh, maybe I shound check the file again. I will check it out asap

yonghao lv commented

2022-08-05 22:22:31 +02:00

Is there an other to get attribute generated from geo node attribute without using depsgraphs?

yonghao lv commented

2022-08-05 22:33:04 +02:00

In #99964#1398428, @OmarEmaraDev wrote:
In your second file, if I connect the Domain Size node to the bezier curve geometry output, it prints the attributes as expected. Could this be the issue or was this just a mistake while preparing the file?

Regardless, I don't think using with contexts and depsgraphs in RNA setter and getter functions is safe.

Yes, It need to link to the output. It was a mistake sorry.
I found the true problem is the obj must be link to the scene so that it can print attribute in 3.3/3.4(It didn't to link to the scene in 3.2)

3.4 with obj unlink

3.4 with obj link

> In #99964#1398428, @OmarEmaraDev wrote: > In your second file, if I connect the Domain Size node to the bezier curve geometry output, it prints the attributes as expected. Could this be the issue or was this just a mistake while preparing the file? > > Regardless, I don't think using with contexts and depsgraphs in RNA setter and getter functions is safe. Yes, It need to link to the output. It was a mistake sorry. I found the true problem is the obj must be link to the scene so that it can print attribute in 3.3/3.4(It didn't to link to the scene in 3.2) 3.4 with obj unlink ![image.png](https://archive.blender.org/developer/F13338504/image.png) 3.4 with obj link ![image.png](https://archive.blender.org/developer/F13338510/image.png)

Omar Emara commented

2022-08-07 14:47:02 +02:00

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

Omar Emara commented

2022-08-15 12:27:16 +02:00

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

Omar Emara commented

2022-08-15 12:27:16 +02:00

Can you clarify your last point? Which object wasn't linked to the scene? The one named Motion Control-MotionPath? Is that in the second file you shared?

Can you clarify your last point? Which object wasn't linked to the scene? The one named `Motion Control-MotionPath`? Is that in the second file you shared?

yonghao lv commented

2022-08-17 12:31:04 +02:00

get_geo_obj_attr2 (1).blend1
upload again

[get_geo_obj_attr2 (1).blend1](https://archive.blender.org/developer/F13396671/get_geo_obj_attr2__1_.blend1) upload again

Omar Emara commented

2022-08-17 14:12:17 +02:00

I still don't understand the issue. It prints {'factor': [0.0, 0.9999999403953552], 'length': [0.0, 0.0]} for me when Cube.001 is selected, which means the attributes are correctly retrieved.

Can you clarify this?

Can you clarify your last point? Which object wasn't linked to the scene? The one named Motion Control-MotionPath? Is that in the second file you shared?

I still don't understand the issue. It prints `{'factor': [0.0, 0.9999999403953552], 'length': [0.0, 0.0]}` for me when `Cube.001` is selected, which means the attributes are correctly retrieved. Can you clarify this? > Can you clarify your last point? Which object wasn't linked to the scene? The one named `Motion Control-MotionPath`? Is that in the second file you shared?

yonghao lv commented

2022-08-19 17:26:14 +02:00

In #99964#1405126, @OmarEmaraDev wrote:
I still don't understand the issue. It prints {'factor': [0.0, 0.9999999403953552], 'length': [0.0, 0.0]} for me when Cube.001 is selected, which means the attributes are correctly retrieved.

Can you clarify this?

Can you clarify your last point? Which object wasn't linked to the scene? The one named Motion Control-MotionPath? Is that in the second file you shared?

check this file get_geo_obj_attr2 (1).blend1 and run the script
Problem: in 3.2 and early 3.3 , attribute can be printed while the object is not linked to the scene, but in later 3,3 and 3.4 , object must be linked to the scene so that the attribute can be printed

> In #99964#1405126, @OmarEmaraDev wrote: > I still don't understand the issue. It prints `{'factor': [0.0, 0.9999999403953552], 'length': [0.0, 0.0]}` for me when `Cube.001` is selected, which means the attributes are correctly retrieved. > > Can you clarify this? > >> Can you clarify your last point? Which object wasn't linked to the scene? The one named `Motion Control-MotionPath`? Is that in the second file you shared? check this file [get_geo_obj_attr2 (1).blend1](https://archive.blender.org/developer/F13396671/get_geo_obj_attr2__1_.blend1) and run the script Problem: in 3.2 and early 3.3 , attribute can be printed while the object is not linked to the scene, but in later 3,3 and 3.4 , object must be linked to the scene so that the attribute can be printed

Omar Emara commented

2022-08-19 17:34:42 +02:00

I suspect the 3.3/3.4 behavior is the more correct one, since unlinked objects will not be evaluated because they don't affect anything. So wouldn't this be expected?
What is the use case for evaluating an unlinked object?

I suspect the 3.3/3.4 behavior is the more correct one, since unlinked objects will not be evaluated because they don't affect anything. So wouldn't this be expected? What is the use case for evaluating an unlinked object?

yonghao lv commented

2022-08-25 03:45:50 +02:00

So what I expect is I can read bpy.data.objects's attributes without linking them to the scene. If we can read their location, we shounld be able to read their attirbute.
Seems now the deps graph no longer consider the object not link to the scene?

So what I expect is I can read bpy.data.objects's attributes without linking them to the scene. If we can read their location, we shounld be able to read their attirbute. Seems now the deps graph no longer consider the object not link to the scene?

Omar Emara commented

2022-08-25 07:44:56 +02:00

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

Philipp Oeser commented

2022-08-30 13:59:23 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-08-30 13:59:23 +02:00

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

Philipp Oeser commented

2022-08-30 13:59:23 +02:00

Situation is unclear for me.

In #99964#1406179, @1029910278 wrote:
check this file get_geo_obj_attr2 (1).blend1 and run the script
Problem: in 3.2 and early 3.3 , attribute can be printed while the object is not linked to the scene, but in later 3,3 and 3.4 , object must be linked to the scene so that the attribute can be printed

I dont see a difference in 3.2 vs. master, selecting Cube.001 after running the script and changing the test_value will equally print an empty dict {}
What am I doing wrong?

Situation is unclear for me. > In #99964#1406179, @1029910278 wrote: > check this file [get_geo_obj_attr2 (1).blend1](https://archive.blender.org/developer/F13396671/get_geo_obj_attr2__1_.blend1) and run the script > Problem: in 3.2 and early 3.3 , attribute can be printed while the object is not linked to the scene, but in later 3,3 and 3.4 , object must be linked to the scene so that the attribute can be printed I dont see a difference in 3.2 vs. master, selecting `Cube.001` after running the script and changing the test_value will equally print an empty dict {} What am I doing wrong?

Philipp Oeser commented

2022-09-06 13:56:19 +02:00

poke ^

yonghao lv commented

2022-09-12 19:19:51 +02:00

sorry, busy for moving house last week. I will give an respond tomorrow

Philipp Oeser commented

2022-09-28 09:39:12 +02:00

one more poke ^

Philipp Oeser commented

2022-10-09 14:21:51 +02:00

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

Philipp Oeser closed this issue

2022-10-09 14:21:51 +02:00

Philipp Oeser commented

2022-10-09 14:21:51 +02:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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

Can not get eval obj's attribute in get/set function #99964