Regression: Activating DynTopo creates a hidden sculpt mask attribute that gets duplicated with every activation #119426

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Tolkfan · 2024-03-13T16:24:21+01:00

Tolkfan commented

2024-03-13 16:24:21 +01:00

System Information
Operating system: Windows 10
Graphics card: Nvidia

Blender Version
Broken: 4.1 (Beta 13 Mar 03:20 6b81fbced817)
Worked: 4.0

Short description of error

When DynTopo is activated on an object, a hidden .sculpt_mask attribute is immediately created (not normal behavior) and then duplicated with each activation (definitely not normal behavior).

This .sculpt_mask attribute triggers the DynTopo warning every time you try to turn on Dyntopo. It also disables DynTopo every time you switch between objects with Alt+Q. Then you have to turn on Dyntopo on the object again, which creates a new duplicate, and pretty soon you end up with a lot of invisible duplicates... not to mention the constant Dyntopo warning popups.

The duplicates are not removed with the bpy.ops.mesh.customdata_mask_clear() operator in Data tab -> Geometry Data
The .sculpt_mask attribute is already present on the default cube, but not on a newly created one.

Exact steps for others to reproduce the error

starting from the default cube
on the cube, toggle DynTopo on and off a few times
Check the cube's attribute list in the python console, there will be .sculpt_mask duplicates for every time you toggled Dyntopo

**System Information** Operating system: Windows 10 Graphics card: Nvidia **Blender Version** Broken: 4.1 (Beta 13 Mar 03:20 `6b81fbced817`) Worked: 4.0 **Short description of error** When DynTopo is activated on an object, a hidden `.sculpt_mask` attribute is immediately created (not normal behavior) and then duplicated with each activation (definitely not normal behavior). This `.sculpt_mask` attribute triggers the DynTopo warning every time you try to turn on Dyntopo. It also disables DynTopo every time you switch between objects with Alt+Q. Then you have to turn on Dyntopo on the object again, which creates a new duplicate, and pretty soon you end up with a lot of invisible duplicates... not to mention the constant Dyntopo warning popups. The duplicates are not removed with the `bpy.ops.mesh.customdata_mask_clear()` operator in Data tab -> Geometry Data The `.sculpt_mask` attribute is already present on the default cube, but not on a newly created one. **Exact steps for others to reproduce the error** - starting from the default cube - on the cube, toggle DynTopo on and off a few times - Check the cube's attribute list in the python console, there will be `.sculpt_mask` duplicates for every time you toggled Dyntopo

sculpt_mask_dupli.jpg

22 KiB