Python: Grease Pencil frame not updating when frame number is changed #99524

New Issue

Falk David · 2022-07-07T16:31:56+02:00

Falk David commented

2022-07-07 16:31:56 +02:00

System Information
Operating system: Linux-5.15.0-10037-tuxedo-x86_64-with-glibc2.35 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.129.06

Blender Version
Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-07-07 14:01, hash: 59e1009f10
Broken: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691
Worked: (unkown)

Short description of error
When changing the frame_number of a grease pencil frame, the grease pencil object is not updated correctly. The frame stays where it previously was.

Exact steps for others to reproduce the error

Open the attached .blend file
Run the python script

Scrub the timeline to see that frame 9 still shows up at frame 9 in the 3d viewport even though it should be at frame 19. It does correctly show in the dopesheet however.

greasepencil_frame_update_bug.blend

**System Information** Operating system: Linux-5.15.0-10037-tuxedo-x86_64-with-glibc2.35 64 Bits Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 470.129.06 **Blender Version** Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-07-07 14:01, hash: `59e1009f10` Broken: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691 Worked: (unkown) **Short description of error** When changing the `frame_number` of a grease pencil frame, the grease pencil object is not updated correctly. The frame stays where it previously was. **Exact steps for others to reproduce the error** - Open the attached `.blend` file - Run the python script # Scrub the timeline to see that frame 9 still shows up at frame 9 **in the 3d viewport** even though it should be at frame 19. It does correctly show in the dopesheet however. [greasepencil_frame_update_bug.blend](https://archive.blender.org/developer/F13265598/greasepencil_frame_update_bug.blend)

Falk David commented

2022-07-07 16:31:56 +02:00

Added subscriber: @filedescriptor

blender-admin commented

2022-07-07 16:36:21 +02:00

This issue was referenced by 60e2dfd1e8

This issue was referenced by 60e2dfd1e84e78cd3d182c94e0548869d6108351

Nick Alberelli commented

2022-07-07 16:39:45 +02:00

Added subscriber: @TinyNick

Germano Cavalcante commented

2022-07-07 23:40:41 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-07-07 23:40:41 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Germano Cavalcante commented

2022-07-07 23:40:41 +02:00

Adding the line bpy.data.grease pencil["Stroke"].update tag() seems to partially solve the problem.
I wonder if this update tag should be done directly in RNA (as seen by using rna_GPencil_update on other properties).
It looks more like an API design issue. Should the prop call the update functions automatically or let the coder handle it?

(in my opinion it should be the first case).

Adding the line `bpy.data.grease pencil["Stroke"].update tag()` seems to partially solve the problem. I wonder if this update tag should be done directly in RNA (as seen by using `rna_GPencil_update` on other properties). It looks more like an API design issue. Should the prop call the update functions automatically or let the coder handle it? (in my opinion it should be the first case).

Antonio Vazquez commented

2022-07-12 13:21:03 +02:00

Added subscriber: @antoniov

Antonio Vazquez commented

2022-07-12 13:21:03 +02:00

I don't see any problem updating in RNA directly as @filedescriptor made... not sure if he tested to see if any performance issue, if not...the fix LGTM.

Germano Cavalcante commented

2022-07-12 14:26:02 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Falk David commented

2022-08-23 13:54:16 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Falk David closed this issue

2022-08-23 13:54:16 +02:00

Falk David self-assigned this 2022-08-23 13:54:16 +02:00

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Python: Grease Pencil frame not updating when frame number is changed #99524

Scrub the timeline to see that frame 9 still shows up at frame 9 in the 3d viewport even though it should be at frame 19. It does correctly show in the dopesheet however.