Grease Pencil: Crash when trying to sculpt on object with Dot Dash modifier #102684
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Reference: blender/blender#102684
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System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: Radeon RX 570 Series ATI Technologies Inc. 4.5.0 Core Profile Context 22.11.1.221110
Blender Version
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2022-11-21 01:31, hash:
7a6cdeb242
Worked: 3.0?
I'm not sure I can say it worked. While it doesn't crash sculpting still doesn't work as expected.
Short description of error
Blender crashes when I try to sculpt on Grease Pencil object with Dot Dash modifier.
Stroke.crash.txt
Exact steps for others to reproduce the error
Stroke.blend
Added subscriber: @persun
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Can confirm, will check
Added subscriber: @antoniov
Can confirm too... I guess is the orig pointer is not set to NULL... testing.
This issue was referenced by
17fd81fb9b
This issue was referenced by
8c82d4cbf6
Sculpting only works if the
Edit Mode
/show_in_editmode
option is disabled.I think there is a general issue with generative GP modifiers with the
Edit Mode
/show_in_editmode
option: these show evaluated points that can be edited (as if an On Cage option - like the one for generative mesh modifiers - was enabled) but also e.g. theDot Dash
modifier does not draw the original stroke edit points at all anymore > so you cant actually use editmode with that modifier (and theshow_in_editmode
option). This all seems very wrong.Then we also have the
Subdivide
modifier (which draws a mixture of original points - which can be edited - and evaluated points - which cannot be edited and draw in a different color -). Think this needs a general design of some sort.Changed status from 'Confirmed' to: 'Resolved'
Regarding the crash: this broke between good
e86c2f7288
and bad7f4ee97b9e
, will bisect if that helps.The generated points are always gray color, so these points are not editable. Anyway, this is something we want to revieww for GP 3.0.
OK,
8c82d4cbf6
actually solved the issue of not being able to sculpt with theshow_in_editmode
option.However, the following is not true (for the
Dot Dash
modifier):These generated points are never drawn for this modifier.
In addition, using selection mask (of any type) is not working with this modifier.
@antoniov : want a new report?
@lichtwerk This is a complex problem. The Modifier generates new points and we set the reference to the original points to allow the transformation, but to use Mask and to be drawn the point, it needs to be an original point. As the points are all evaluated, you cannot select them, so you cannot use any masking because its base in the selection.
It is not only an issue in sculptmode, editmode also does not draw any points to edit with this modifier (
show_in_editmode
ON)Looks like this is not included in 3.3 updates or marked for backport?
Added the fix to #100749 (Blender LTS: Maintenance Task 3.3) (not 100% sure it is backportable)