RuntimeError when baking multiple dynamic paint surfaces in a script #117186

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Ryan Guy · 2024-01-16T22:58:09+01:00

Ryan Guy commented

2024-01-16 22:58:09 +01:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.99

Blender Version
Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-16 15:56, hash: da6b45f9b831
Worked:

Short description of error
I am trying to run a script to bake multiple dynamic paint surfaces as an image sequence but am receiving an error, crash, or incomplete caches upon running the script.

In this setup I have two objects with a dynamic paint canvas added. Each canvas contains two DynamicPaintSurfaces and each is set to output an image sequence to a different cache path. This is the script being used to bake the dynamic paint surfaces:

import bpy

objects = [bpy.data.objects["CanvasObject1"], bpy.data.objects["CanvasObject2"]]
for obj in objects:
    bpy.ops.object.select_all(action='DESELECT')
    bpy.context.view_layer.objects.active = obj
    
    dpaint_modifier = obj.modifiers[0]
    canvas_surfaces = dpaint_modifier.canvas_settings.canvas_surfaces
    for idx in range(len(canvas_surfaces)):
        canvas_surfaces.active_index = idx
        
        print("Begin baking surface: ", bpy.context.view_layer.objects.active.name, canvas_surfaces[canvas_surfaces.active_index].name)
        bpy.ops.dpaint.bake()
        print("Finished baking surface")

When running the script, there seems to be different random outcomes:

A RuntimeError is displayed:

Begin baking surface:  CanvasObject1 Surface_1_1
Finished baking surface
Begin baking surface:  CanvasObject1 Surface_1_2
Finished baking surface
Traceback (most recent call last):
  File "C:\Users\ryanl\Downloads\dpaint_bake_error.blend\Text", line 5, in <module>
  File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 103, in __call__
    _BPyOpsSubModOp._view_layer_update(context)
  File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 68, in _view_layer_update
    view_layer.update()
RuntimeError: Error: Dependency graph update requested during evaluation

Error: Python: Traceback (most recent call last):
  File "C:\Users\ryanl\Downloads\dpaint_bake_error.blend\Text", line 5, in <module>
  File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 103, in __call__
    _BPyOpsSubModOp._view_layer_update(context)
  File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 68, in _view_layer_update
    view_layer.update()
RuntimeError: Error: Dependency graph update requested during evaluation

Blender crashes with an EXCEPTION_ACCESS_VIOLATION. Crash log: dpaint_bake_error.crash.txt
Sometimes the script runs to completion, but not all four unique cache path directories have been generated/baked. Sometimes the script will appear to complete, but Blender hangs and becomes unresponsive.

Exact steps for others to reproduce the error

Attached is a Blend file containing the setup and script: dpaint_bake_error.blend

Open Blend file
Run the script, multiple times if needed

Result: RuntimeError or other outcomes mentioned above.

Let me know if anything else is needed, or if I am misusing the Python API within the script.

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.99 **Blender Version** Broken: version: 4.1.0 Alpha, branch: main, commit date: 2024-01-16 15:56, hash: `da6b45f9b831` Worked: **Short description of error** I am trying to run a script to bake multiple dynamic paint surfaces as an image sequence but am receiving an error, crash, or incomplete caches upon running the script. In this setup I have two objects with a dynamic paint canvas added. Each canvas contains two DynamicPaintSurfaces and each is set to output an image sequence to a different cache path. This is the script being used to bake the dynamic paint surfaces: ```Py import bpy objects = [bpy.data.objects["CanvasObject1"], bpy.data.objects["CanvasObject2"]] for obj in objects: bpy.ops.object.select_all(action='DESELECT') bpy.context.view_layer.objects.active = obj dpaint_modifier = obj.modifiers[0] canvas_surfaces = dpaint_modifier.canvas_settings.canvas_surfaces for idx in range(len(canvas_surfaces)): canvas_surfaces.active_index = idx print("Begin baking surface: ", bpy.context.view_layer.objects.active.name, canvas_surfaces[canvas_surfaces.active_index].name) bpy.ops.dpaint.bake() print("Finished baking surface") ``` When running the script, there seems to be different random outcomes: 1. A RuntimeError is displayed: ``` Begin baking surface: CanvasObject1 Surface_1_1 Finished baking surface Begin baking surface: CanvasObject1 Surface_1_2 Finished baking surface Traceback (most recent call last): File "C:\Users\ryanl\Downloads\dpaint_bake_error.blend\Text", line 5, in <module> File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 103, in __call__ _BPyOpsSubModOp._view_layer_update(context) File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 68, in _view_layer_update view_layer.update() RuntimeError: Error: Dependency graph update requested during evaluation Error: Python: Traceback (most recent call last): File "C:\Users\ryanl\Downloads\dpaint_bake_error.blend\Text", line 5, in <module> File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 103, in __call__ _BPyOpsSubModOp._view_layer_update(context) File "C:\Program Files\blender\4.1.0-alpha+main.da6b45f9b831-windows.amd64-release\4.1\scripts\modules\bpy\ops.py", line 68, in _view_layer_update view_layer.update() RuntimeError: Error: Dependency graph update requested during evaluation ``` 2. Blender crashes with an EXCEPTION_ACCESS_VIOLATION. Crash log: [dpaint_bake_error.crash.txt](/attachments/c93b3b47-6614-43c3-a6c9-4651b9f94747) 3. Sometimes the script runs to completion, but not all four unique cache path directories have been generated/baked. Sometimes the script will appear to complete, but Blender hangs and becomes unresponsive. **Exact steps for others to reproduce the error** Attached is a Blend file containing the setup and script: [dpaint_bake_error.blend](/attachments/25148b5c-c7a6-4550-9067-72878a2fde7f) 1. Open Blend file 2. Run the script, multiple times if needed Result: RuntimeError or other outcomes mentioned above. Let me know if anything else is needed, or if I am misusing the Python API within the script.

dpaint_bake_error.crash.txt

64 KiB

dpaint_bake_error.blend

926 KiB

Ryan Guy added the

labels 2024-01-16 22:58:10 +01:00

Pratik Borhade commented

2024-01-17 08:26:01 +01:00

Thanks for the report. Can confirm when baking more than one paint-surface. Looks like changing active_index caused this. Because error is triggered prior to second bake function.
Maybe expected behavior since this is terminated when update was sent to viewlayer but depsgraph evaluation wasn't completed

Thanks for the report. Can confirm when baking more than one paint-surface. Looks like changing `active_index` caused this. Because error is triggered prior to second bake function. Maybe expected behavior since this is terminated when update was sent to viewlayer but depsgraph evaluation wasn't completed

Pratik Borhade added

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RuntimeError when baking multiple dynamic paint surfaces in a script #117186