GPencil: Strokes cannot be erased, sculpted or painted #76950

New Issue

Andry · 2020-05-21T22:45:50+02:00

Andry commented

2020-05-21 22:45:50 +02:00

System Information
Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits
Graphics card: NVIDIA GeForce GT 750M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-12.0.23 355.11.10.50.10.103

Blender Version
Broken: version: 2.90 (sub 2), branch: master, commit date: 2020-05-18 23:33, hash: 7bd07c9f5a
Worked: (newest version of Blender that worked as expected)

Short description of error
At some point during the drawing process in a GP object, the eraser can't erase the lines anymore. All layers and colors are unlocked and there is only one keyframe.
But after switching to edit mode and moving some points manually, these points are erasable again.

Exact steps for others to reproduce the error

Select the GPencil object
Go to draw mode
Select the eraser tool and try to erase the drawing. RESULT : nothing happens
Go to edit mode
Select a few random points of the drawing with the selection tool and move the points. Validate the new position
Go to draw mode
Select the eraser tool and try to erase the whole drawing. RESULT : {F8546840}only the lines with the moved points are erased

**System Information** Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits Graphics card: NVIDIA GeForce GT 750M OpenGL Engine NVIDIA Corporation 4.1 NVIDIA-12.0.23 355.11.10.50.10.103 **Blender Version** Broken: version: 2.90 (sub 2), branch: master, commit date: 2020-05-18 23:33, hash: `7bd07c9f5a` Worked: (newest version of Blender that worked as expected) **Short description of error** At some point during the drawing process in a GP object, the eraser can't erase the lines anymore. All layers and colors are unlocked and there is only one keyframe. But after switching to edit mode and moving some points manually, these points are erasable again. **Exact steps for others to reproduce the error** 1. Select the GPencil object 2. Go to draw mode 3. Select the eraser tool and try to erase the drawing. RESULT : nothing happens 6. Go to edit mode 7. Select a few random points of the drawing with the selection tool and move the points. Validate the new position 8. Go to draw mode 9. Select the eraser tool and try to erase the whole drawing. RESULT : {[F8546840](https://archive.blender.org/developer/F8546840/greasepencil_eraser_bug.blend)}only the lines with the moved points are erased

Andry commented

2020-05-21 22:45:50 +02:00

Added subscriber: @Dedouze

ronsn commented

2020-05-21 22:50:20 +02:00

Added subscriber: @ronsn

ronsn commented

2020-05-21 22:50:20 +02:00

@Dedouze Can you reattach your .blend file? It seems to be broken in the wysiwyg editor.

Andry commented

2020-05-21 23:02:18 +02:00

greasepencil eraser bug.blend

Ah yeah. Good luck !

[greasepencil eraser bug.blend](https://archive.blender.org/developer/F8546856/greasepencil_eraser_bug.blend) Ah yeah. Good luck !

Antonio Vazquez self-assigned this 2020-05-22 08:41:55 +02:00

Antonio Vazquez commented

2020-05-22 08:49:25 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Antonio Vazquez commented

2020-05-22 08:49:25 +02:00

@Dedouze Do you remember what you were doing when the problem started?

Antonio Vazquez changed title from ~~Greasepencil strokes not erasable until moved in edit mode~~ to GPencil: Strokes cannot be erased, sculpted or painted

2020-05-22 09:57:49 +02:00

Antonio Vazquez commented

2020-05-22 10:02:25 +02:00

The problem is related to the internal stroke bounding box used to determine if the brush collides with the stroke. As the bounding box is outdated, the brush cannot determine if the brush collides with stroke and any brush related operation does not work.

As a quick fix, just enter in Edit mode, select all, move the strokes and cancel and return to Draw mode. This operation will update the bounding box.

The point here is try to find what operation produced the outdate of the bounding box.

The problem is related to the internal stroke bounding box used to determine if the brush collides with the stroke. As the bounding box is outdated, the brush cannot determine if the brush collides with stroke and any brush related operation does not work. As a quick fix, just enter in Edit mode, select all, move the strokes and cancel and return to Draw mode. This operation will update the bounding box. The point here is try to find what operation produced the outdate of the bounding box.

Antonio Vazquez commented

2020-05-22 10:03:49 +02:00

@Dedouze Could you try to reproduce the problem and determine the steps? Fix the issue is very simple if we know where.

Antonio Vazquez commented

2020-07-02 22:51:35 +02:00

@Dedouze Did you find a way to reproduce it? have you found again the bug?

ronsn commented

2020-07-03 00:25:04 +02:00

@Dedouze And: I remember you did a live stream some time ago, but I didn't watch it. Maybe you did some more and maybe the issue occurred in one of the streams? Then we could watch it and see what causes the issue.

Andry commented

2020-07-03 11:16:44 +02:00

I think i reproduced it once by using the symmetry modifier to create a drawing and then clock on apply for the modifier, but i couldn’t reproduce it another time, so maybe there is something else. I have some live recordings also but i don’t remember the occurence on the bug on it. Let me check again today, i will tell you if i find a recording.
Thanks for your help!

I think i reproduced it once by using the symmetry modifier to create a drawing and then clock on apply for the modifier, but i couldn’t reproduce it another time, so maybe there is something else. I have some live recordings also but i don’t remember the occurence on the bug on it. Let me check again today, i will tell you if i find a recording. Thanks for your help!

Antonio Vazquez commented

2020-08-18 16:40:53 +02:00

Closed as duplicate of #79651

Antonio Vazquez closed this issue

2020-08-18 16:40:53 +02:00

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GPencil: Strokes cannot be erased, sculpted or painted #76950