Crash with python script #51014

New Issue

Geoffrey Bantle · 2017-03-20T22:30:50+01:00

Geoffrey Bantle commented

2017-03-20 22:30:50 +01:00

System Information:

Windows 7 Enterprise 64 bit
Blender 2.78c 64 bit official windows build

To reproduce:

Open the file crash_noise.blend

Run the python script in the text editor

On my system this results in Blender crashing with the message:
"Error: EXCEPTION_ACCESS_VIOLATION"

Note:

The python function "split_non_manifold_vertices" is called in a loop to help reproduce the crash more consistently on release builds. Without the loop it crashes very consistently the first time executing the function while running a debug build in the visual studio 2013 debugger.crash_noise.zip

System Information: Windows 7 Enterprise 64 bit Blender 2.78c 64 bit official windows build To reproduce: Open the file crash_noise.blend Run the python script in the text editor On my system this results in Blender crashing with the message: "Error: EXCEPTION_ACCESS_VIOLATION" Note: The python function "split_non_manifold_vertices" is called in a loop to help reproduce the crash more consistently on release builds. Without the loop it crashes very consistently the first time executing the function while running a debug build in the visual studio 2013 debugger.[crash_noise.zip](https://archive.blender.org/developer/F517038/crash_noise.zip)

Geoffrey Bantle commented

2017-03-20 22:30:50 +01:00

Changed status to: 'Open'

Geoffrey Bantle commented

2017-03-20 22:30:50 +01:00

Added subscriber: @gbantle-3

Germano Cavalcante commented

2017-03-20 23:36:37 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2017-03-20 23:36:37 +01:00

Changed status from 'Open' to: 'Archived'

Germano Cavalcante closed this issue

2017-03-20 23:36:37 +01:00

Germano Cavalcante self-assigned this 2017-03-20 23:36:37 +01:00

Germano Cavalcante commented

2017-03-20 23:36:37 +01:00

It is dangerous to work with scripts that add and delete many elements of a bmesh.
But I think the problem is in this part:

(...)
    idx_layer = bm.faces.layers.int.get("kmt_original_idx")
    for face in bm.faces:
        face.index = face[idx_layer]
(...)

Using a layer as id does not seem right.
And I'm not sure, but I think face.index is read_only.

Anyway. This seems to be a problem in the script.

It is dangerous to work with scripts that add and delete many elements of a bmesh. But I think the problem is in this part: ``` (...) idx_layer = bm.faces.layers.int.get("kmt_original_idx") for face in bm.faces: face.index = face[idx_layer] (...) ``` Using a layer as id does not seem right. And I'm not sure, but I think face.index is read_only. Anyway. This seems to be a problem in the script.

Geoffrey Bantle commented

2017-03-21 15:42:35 +01:00

Thanks for the prompt response!

I was hoping you could clarify something, you say that face.index is read only, but there are several examples in the documentation of modifying it. Specifically the documentation for sort() and index_update() on this page shows that the face indices can be modified in much the way I am doing in the python snippet I submitted.

https://docs.blender.org/api/2.78b/bmesh.types.html#bmesh.types.BMFaceSeq

Is there an error in the documentation? If so should I file a bug report/issue for them?

Thanks for the prompt response! I was hoping you could clarify something, you say that face.index is read only, but there are several examples in the documentation of modifying it. Specifically the documentation for sort() and index_update() on this page shows that the face indices can be modified in much the way I am doing in the python snippet I submitted. https://docs.blender.org/api/2.78b/bmesh.types.html#bmesh.types.BMFaceSeq Is there an error in the documentation? If so should I file a bug report/issue for them?

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Crash with python script #51014