Evaluated_depsgraph_get() freeze when curve deform present #73516

New Issue

Konstantins Visnevskis · 2020-01-30T22:06:00+01:00

2020-01-30 22:06:00 +01:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 580/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35

Blender Version
Broken: version: 2.83 (sub 2), branch: master, commit date: 2020-01-30 11:04, hash: 2142288eae

Short description of error
Porting a rig script from 2.79.
AFAI understand, now to read the evaluated mesh data one has to pass Depsgraph to bm.From_object(), which seems to require Evaluated_depsgraph_get().
And that seems to freeze Blender when called from a driver on a scene containing a curve deform.
Tested with builds of 2.81, 2.83 alpha

Exact steps for others to reproduce the error
test.blend

Open the file allowing scripts -> Freeze

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 580/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.35 **Blender Version** Broken: version: 2.83 (sub 2), branch: master, commit date: 2020-01-30 11:04, hash: `2142288eae` **Short description of error** Porting a rig script from 2.79. AFAI understand, now to read the evaluated mesh data one has to pass Depsgraph to bm.From_object(), which seems to require Evaluated_depsgraph_get(). And that seems to freeze Blender when called from a driver on a scene containing a curve deform. Tested with builds of 2.81, 2.83 alpha **Exact steps for others to reproduce the error** [test.blend](https://archive.blender.org/developer/F8313914/test.blend) - Open the file allowing scripts -> Freeze

Konstantins Visnevskis commented

2020-01-30 22:06:00 +01:00

Added subscriber: @KonstantinsVisnevskis

Joseph Brandenburg commented

2020-02-03 03:11:04 +01:00

Added subscriber: @Josephbburg

Joseph Brandenburg commented

2020-02-03 03:11:04 +01:00

I can confirm the freeze. It seems reasonable that you wouldn't be able to update the depsgraph in the process of updating the depsgraph... seems like that should lead to an infinite recursion situation.

Using the current depsgraph: dg = bpy.context.view_layer.depsgraph doesn't freeze Blender. I think maybe using bpy.data.meshes.new_from_object() might be what you want, also. (https://docs.blender.org/api/current/bpy.types.BlendDataMeshes.html?highlight=new_from_object#bpy.types.BlendDataMeshes.new_from_object)

I don't think this is a bug.

I can confirm the freeze. It seems reasonable that you wouldn't be able to update the depsgraph in the process of updating the depsgraph... seems like that should lead to an infinite recursion situation. Using the current depsgraph: `dg = bpy.context.view_layer.depsgraph` doesn't freeze Blender. I think maybe using `bpy.data.meshes.new_from_object()` might be what you want, also. (https://docs.blender.org/api/current/bpy.types.BlendDataMeshes.html?highlight=new_from_object#bpy.types.BlendDataMeshes.new_from_object) I don't think this is a bug.

Brecht Van Lommel commented

2020-02-03 12:09:24 +01:00

Added subscriber: @brecht