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Crash creating "position" attribute with the wrong type while in Edit mode #107232

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opened 2023-04-22 03:12:26 +02:00 by Thomas Barlow · 4 comments
Thomas Barlow commented 2023-04-22 03:12:26 +02:00
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System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.41

Blender Version
Broken: 3.5.0 and 3.6.0 Alpha, branch: main, commit date: 2023-04-20 23:46, hash: 5721b34e5364
Worked:

Short description of error
While in Edit mode, attempting to create an attribute called "position" that has type not set to "FLOAT_VECTOR" will crash Blender.

I couldn't get any other attributes to crash when added while in Edit mode.
Creating the "position" attribute with the correct type, but incorrect domain does not cause a crash either.

I can't imagine a use case for users wanting to do this, but it came up while I was determining the extent of #107228 and isn't really the same issue.

Exact steps for others to reproduce the error

  1. Select a mesh object
  2. Enter Edit Mode
  3. Either:
    1. Run bpy.context.object.data.attributes.new("position", "FLOAT", "POINT") from the Python Console
    2. Create a new attribute called "position" using the bpy.ops.geometry.attribute_add operator and set the Data Type to anything other than Vector: image
**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.41 **Blender Version** Broken: 3.5.0 and 3.6.0 Alpha, branch: main, commit date: 2023-04-20 23:46, hash: `5721b34e5364` Worked: **Short description of error** While in Edit mode, attempting to create an attribute called `"position"` that has type not set to `"FLOAT_VECTOR"` will crash Blender. I couldn't get any other attributes to crash when added while in Edit mode. Creating the `"position"` attribute with the correct type, but incorrect domain does not cause a crash either. I can't imagine a use case for users wanting to do this, but it came up while I was determining the extent of https://projects.blender.org/blender/blender/issues/107228 and isn't really the same issue. **Exact steps for others to reproduce the error** 1. Select a mesh object 1. Enter Edit Mode 1. Either: 1. Run `bpy.context.object.data.attributes.new("position", "FLOAT", "POINT")` from the Python Console 1. Create a new attribute called "position" using the `bpy.ops.geometry.attribute_add` operator and set the `Data Type` to anything other than `Vector`: ![image](/attachments/13556957-8f36-47b0-8088-a9c53a2c8397)
image.png
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Thomas Barlow added the
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 labels 2023-04-22 03:12:27 +02:00
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 label 2023-04-22 10:02:12 +02:00
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Philipp Oeser commented 2024-02-16 14:42:21 +01:00
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The crash is because positions are always accessed/treated as CD_PROP_FLOAT3 / float3 around code [without checking], but this is not a given if we let users create "builtin" attributes with other types.

@HooglyBoogly : shouldnt we really guard against creating attributes with used builtin names?

Here is another unfortunate case:

  • even if you create the "position" attribute with the correct type (Vector) in editmode, that will complete wipe/destroy the original coords
  • looks like this then:

image

going into objectmode afterwards then makes your mesh collapse.

Does the whole issue deserve High priority?
(will raise for the moment to get the crash out of the way, feel free to lower again though...)

The crash is because positions are always accessed/treated as `CD_PROP_FLOAT3` / `float3` around code [without checking], but this is not a given if we let users create "builtin" attributes with other types. @HooglyBoogly : shouldnt we really guard against creating attributes with used builtin names? Here is another unfortunate case: - even if you create the "position" attribute with the correct type (Vector) in editmode, that will complete wipe/destroy the original coords - looks like this then: ![image](/attachments/64297c32-b604-4282-81c4-c65d4c838b2a) going into objectmode afterwards then makes your mesh collapse. Does the whole issue deserve High priority? (will raise for the moment to get the crash out of the way, feel free to lower again though...)
image.png
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Hans Goudey commented 2024-02-16 14:49:57 +01:00
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shouldnt we really guard against creating attributes with used builtin names?

Yes, we should. The difference in builtin attributes between BMesh and other areas is a problem area.

You sort of have to go out of your way to do this though, which is why I didn't prioritize making it safer so far. But other perspectives make sense too.

> shouldnt we really guard against creating attributes with used builtin names? Yes, we should. The difference in builtin attributes between BMesh and other areas is a problem area. You sort of have to go out of your way to do this though, which is why I didn't prioritize making it safer so far. But other perspectives make sense too.
Hans Goudey added
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 labels 2024-02-16 14:52:44 +01:00
Hans Goudey self-assigned this 2024-03-05 22:30:45 +01:00
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Philipp Oeser commented 2024-03-07 08:38:42 +01:00
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I assume we want this bckported to 3.6 LTS @HooglyBoogly ?

I assume we want this bckported to 3.6 LTS @HooglyBoogly ?
Hans Goudey commented 2024-03-07 14:01:52 +01:00
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Sure, couldn't hurt, it's a pretty simple change.

Sure, couldn't hurt, it's a pretty simple change.
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Reference: blender/blender#107232
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