Grease Pencil: python generated strokes flicker and crash #75144

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Cody Winchester · 2020-03-27T20:49:38+01:00

Cody Winchester commented

2020-03-27 20:49:38 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59

Blender Version
Broken: version: 2.83 (sub 11), branch: master, commit date: 2020-03-27 00:47, hash: e1ee4dff8d
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]
When generating grease pencil strokes with python the results in the 2.83 master build refactor are unstable. They visually glitch and often lead to crashes.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
Test GP Generate.blend
The attached blend file has 2 scripts. 1 that generates random strokes and 1 that copies the existing stable grease pencil object and all of it's strokes/settings. These scripts worked fine before the refactor.

Both result in a grease pencil object that when animated, sculpted, or edited have crazy spiky flickering. The thickness flickers all over the place and the triangles flash in and out.

Eventually if enough sculpting is done it will end up crashing.

The only way to fix it I have found is to join it with another GP object that was created and manually drawn. Then you have to delete the drawn stroke and re-add any modifiers that you setup.

2020-03-27 14-46-10.mp4

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59 **Blender Version** Broken: version: 2.83 (sub 11), branch: master, commit date: 2020-03-27 00:47, hash: `e1ee4dff8d` Worked: (newest version of Blender that worked as expected) **Short description of error** [Please fill out a short description of the error here] When generating grease pencil strokes with python the results in the 2.83 master build refactor are unstable. They visually glitch and often lead to crashes. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] [Test GP Generate.blend](https://archive.blender.org/developer/F8430818/Test_GP_Generate.blend) The attached blend file has 2 scripts. 1 that generates random strokes and 1 that copies the existing stable grease pencil object and all of it's strokes/settings. These scripts worked fine before the refactor. Both result in a grease pencil object that when animated, sculpted, or edited have crazy spiky flickering. The thickness flickers all over the place and the triangles flash in and out. Eventually if enough sculpting is done it will end up crashing. The only way to fix it I have found is to join it with another GP object that was created and manually drawn. Then you have to delete the drawn stroke and re-add any modifiers that you setup. [2020-03-27 14-46-10.mp4](https://archive.blender.org/developer/F8430825/2020-03-27_14-46-10.mp4)

Cody Winchester commented

2020-03-27 20:49:38 +01:00

Added subscriber: @CodyWinchester

blender-admin commented

2020-03-27 20:49:38 +01:00

#74671 was marked as duplicate of this issue

Antonio Vazquez commented

2020-03-27 21:28:22 +01:00

Added subscriber: @antoniov

Antonio Vazquez self-assigned this 2020-03-27 21:28:22 +01:00

Antonio Vazquez commented

2020-03-27 21:28:22 +01:00

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

Antonio Vazquez commented

2020-03-27 21:28:22 +01:00

The glitches in the fill is a bug that we are working #74663

I will take a look at the crash.

The glitches in the fill is a bug that we are working #74663 I will take a look at the crash.

Antonio Vazquez was unassigned by Cody Winchester

2020-03-28 05:25:39 +01:00

Cody Winchester self-assigned this 2020-03-28 05:25:39 +01:00

Cody Winchester commented

2020-03-28 05:25:39 +01:00

In #75144#899077, @antoniov wrote:
The glitches in the fill is a bug that we are working #74663

I will take a look at the crash.

One thing to note is that bug you linked is on grease pencil strokes with a fill material. The materials I have on mine have fill turned off and they still show up when the flicker happens.

> In #75144#899077, @antoniov wrote: > The glitches in the fill is a bug that we are working #74663 > > I will take a look at the crash. One thing to note is that bug you linked is on grease pencil strokes with a fill material. The materials I have on mine have fill turned off and they still show up when the flicker happens.

Antonio Vazquez commented

2020-03-28 09:33:18 +01:00

Yes, the flickering is general, but more visible with fill.