Grease Pencil - Straight line at beginning of stroke #80087
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Reference: blender/blender#80087
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System Information
Operating system: Mac OS Mojave
Graphics card: Intel UHD Graphics
Tablet: Wacom Cintiq
Blender Version
Broken: 2.83.0
When making fast strokes, there is delay that causes a straight line. Most noticeable when drawing quick circles. It seems to be there's a delay between starting the cursor pressing down and starting the stroke.
Based on the default startup, adjusting setting doesn't change the behaviour. The straight line is present with all brushes.
Added subscriber: @LukeCoalman
#91693 was marked as duplicate of this issue
#76550 was marked as duplicate of this issue
Added subscriber: @antoniov
I cannot reproduce on Windows.
I cannot help too much here, I haven't Mac hardware for testing.
Added subscriber: @iss
Similar reports: #79425, #78856
I don't know if this is helpful but I actually found the same thing happening when trying to draw with the mouse. It happened less, but I was still able to get it to happen.
Changed status from 'Needs Triage' to: 'Confirmed'
I can reproduce this on windows, so I can test fix, possibly debug this with some help.
To reproduce I think it is necessary to click LMB while moving mouse relatively quickly.
I would guess this would be bug or limitation on event handling side though. I have seen similar report where moving vertex with mouse would result in different position as to where LMB was released. This could result in 2 sample long delay, but this one looks to be much greater.
In this image I tried to start drawing at the line while moving mouse at relatively constant speed (automation would help here definitely)
3 strokes on right were made with Brush > Advanced > Input Samples set to 10, next 3 strokes on left were made with Input Samples set to 0. Strokes are made diagonally on purpose though I am not sure if there is any agorithm to detect straight lines and optimize number of samples.
So this may be gpencil issue as well because the "delay" may be caused by not interpolating start of stroke, which could be done retroactively.
That is a lot of guesswork though, @antoniov what do you think?
Added subscriber: @donaldradams2
Hey guys, I've just posted to the related issue a possible workaround / cause of this problem. Looks like it is affected by screen resolution.
https://developer.blender.org/T79425#1004990
Grease Pencil - Straight line at beginning of stroke (MacOS)to Grease Pencil - Straight line at beginning of strokeAdded subscriber: @HooglyBoogly
Not sure why this was tagged to the UI module.
If I'm missing just add it back though.
I thought that this may be issue in event handling, but I think it's unlikely.
Added subscriber: @jenkm
@iss one more duplicate #76550 (GPencil: Line bug at the beginning)
@jenkm You are rolling today :) I will merge #76550 here since this one is confirmed.
Added subscribers: @Ssenkya, @PrototypeNM1, @dupoxy, @ankitm
@iss if you want to rule out Windows Event (Ghost) handling, you can set the Tablet API to Windows Ink in a nightly build (requires restarting Blender). I'm confident that API is not missing any events.
Also make sure you can't recreate the behavior in another drawing app, this rules out tablet driver/hardware issues.
Just google "straight line at beginning of stroke" :)
It's something to do with "Double Click":
https://cdn.wacom.com/u/productsupport/drivers/win/professional/releasenotes/Windows_6.3.33.html
https://docs.krita.org/en/user_manual/drawing_tablets.html#wacom-double-click-sensitivity-straight-starts-of-lines
Tested turning off "Double Click" on Wacom setting on Mac it didn't seem to change it at all.
Checked drivers, and Mac drivers don't have the same temporary fix that is in the Windows driver release notes.
https://cdn.wacom.com/u/productsupport/drivers/mac/professional/releasenotes/Mac_6.3.41.html
Added subscriber: @etufo2
For Windows 10 users:
This has bugged me for the longest time as well! It's really put me off using Grease Pencil in production. Someone mentioned Windows Ink and that reminded me of all the issues it can cause with tablets and various drawing apps.
I have an old Wacom Intuos Pro 4, so I turned off "Use Windows Ink" and now that initial straight line is reduced a whole lot.
Try turning that option off and see if it helps.
Added subscriber: @toot-4
win10: Who cannot repeat, the "tutorial" is specially a bit in slowmo (and a mouse and a tablet without a difference. )
(the main thing is to jerk the pen forward and at the end finish with this movement ~~~ (reducing the amplitude))
bugDrawWacomWin10.mp4
*Tip from message about Windows Ink on / off not working.
@etufo2 You should also try using Windows Ink in Blender (the Tablet API setting in preferences, restart after changing) instead of disabling Windows Ink for the tablet. Wintab (the default) has issues with jagged lines when drawing.
OMW, That works so much better! It even respects the pen pressure properly! Thanks for the help.
Added subscriber: @r83617
I registered just to tell that nothing here works. I have windows 10 x64, even in the newest 2.93 there is this bug. I use mouse. My specs are laptop with Intel(R) Pentium(R) CPU N3710 @ 1.60GHz, Radeon 530. Maybe it happens on a lower end pcs. Is there any extra information I can provide to explore this bug? Blender 2021-09-24 22-30-27.mp4
@r83617
please create a new bug report and tagEdit: actually don't bother. Issues with jagged lines for mouse input are unfortunately not solvable on Windows for the time being. If you're curious why the author of paint.net explained a bit of the problem here.@PrototypeNM1.