Grease Pencil pressure sensitivity issue with Adesso Cyber tablet T12 #60967

New Issue

Jason Memm · 2019-01-29T03:59:06+01:00

Jason Memm commented

2019-01-29 03:59:06 +01:00

System Information
Operating system: Windows 10 x64
Graphics card: none

Blender Version
Broken: 2.80 BETA 1b6da95ccb

Short description of error

I ran into an issue with any brush I select, where after I draw a line and let go, Blender thinks I pushed the pen down all the way and leaves a large pen stroke there, or it will slant up to where my pen left the tablet surface. This doesn’t happen every time usually, just like every other. I tried my tablet on other software (Pencil2D) and this does not happen.

Exact steps for others to reproduce the error

I opened the 2D template from the splash screen and began using the tablet to draw, switching from the pencil, to pen, to marker, etc... from time to time.

**System Information** Operating system: Windows 10 x64 Graphics card: none **Blender Version** Broken: 2.80 BETA 1b6da95ccb11 **Short description of error** I ran into an issue with any brush I select, where after I draw a line and let go, Blender thinks I pushed the pen down all the way and leaves a large pen stroke there, or it will slant up to where my pen left the tablet surface. This doesn’t happen every time usually, just like every other. I tried my tablet on other software (Pencil2D) and this does not happen. ![Capture.PNG](https://archive.blender.org/developer/F6438522/Capture.PNG) **Exact steps for others to reproduce the error** I opened the 2D template from the splash screen and began using the tablet to draw, switching from the pencil, to pen, to marker, etc... from time to time.

Jason Memm commented

2019-01-29 03:59:06 +01:00

Added subscriber: @JasonMemm

Sebastian Parborg commented

2019-01-29 13:28:20 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-01-29 13:28:20 +01:00

Does this happen with the latest blender beta?

Jason Memm commented

2019-01-30 01:19:46 +01:00

Yes, I just downloaded the recent one: January 29, 02:29:54 - 957b4547ae Blender 2.8 x64, and the above error still occurs.

Yes, I just downloaded the recent one: January 29, 02:29:54 - 957b4547aeeb Blender 2.8 x64, and the above error still occurs.

Sebastian Parborg commented

2019-01-30 01:26:07 +01:00

Added subscriber: @ChristopherPeerman

Sebastian Parborg commented

2019-01-30 01:26:07 +01:00

@ChristopherPeerman any ideas?

Christopher Peerman commented

2019-01-30 07:58:53 +01:00

Currently Blender uses WM_MOUSExxx and WM_xBUTTON events, as well as WM_POINTERUPDATE events where the pressure is processed. If the last WM_POINTERUPDATE event percieved the pen was off the screen before a WM_xBUTTONUP it may have set the pressure to full (the logic is so that users can remove the pen and draw with the mouse). I'm currently in the process of adding support for more of the WM_POINTERxxx events which should hopefully fix this.

Christopher Peerman was assigned by Sebastian Parborg

2019-01-30 11:06:22 +01:00

Sebastian Parborg commented

2019-01-30 11:06:22 +01:00

I'll assign this to you them. I hope it's ok.

Christopher Peerman commented

2019-01-30 13:37:48 +01:00

Thanks :)

Christopher Peerman commented

2019-02-04 16:32:58 +01:00

Just to give an update to this. I've been working on this and I hope to have something put up for code review later this week. The new version uses the WM_POINTERxxx messages for Touch and Stylus and the GetPointerInfo, GetPointerPenInfo and GetPointerTouch info. So far it seems to be working well, I've just got a little more work to do with it and spend some time testing it. I also hope that this implementation will also fix issues some users have seen on Windows 8.