Start of a brush stroke always results with maximum pen pressure using Wintab and Windows Ink, latest 2.93 alpha and Huion WH1409 v2. #85747

New Issue

Steffen Hartmann · 2021-02-17T19:10:34+01:00

Steffen Hartmann commented

2021-02-17 19:10:34 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon RX 580 Series ATI Technologies Inc. 4.5.14758 Core Profile Context 21.2.2 27.20.14535.1000

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-16 23:15, hash: 461d4fc1aa
Worked: 2.91

Short description of error
Starting a brush stroke always results in maximum pen pressure, even tho i use low pressure. Bug in Wintab and WIndows Ink but Windows Ink also gives no brushstroke except the initial maximum pen pressure dot. See video.2021-02-17 19-00-25.mp4

All drivers are up to date.

EDIT: EDIT: I restarted my PC and it seems Windows Ink is working fine now. Proper pen pressure and no pressure spikes but instead Wintab gives me full pen pressure all the time. Weird...

Exact steps for others to reproduce the error
Use a Huion tablet and sculpt something

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Radeon RX 580 Series ATI Technologies Inc. 4.5.14758 Core Profile Context 21.2.2 27.20.14535.1000 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-16 23:15, hash: `461d4fc1aa` Worked: 2.91 **Short description of error** Starting a brush stroke always results in maximum pen pressure, even tho i use low pressure. Bug in Wintab and WIndows Ink but Windows Ink also gives no brushstroke except the initial maximum pen pressure dot. See video.[2021-02-17 19-00-25.mp4](https://archive.blender.org/developer/F9812865/2021-02-17_19-00-25.mp4) All drivers are up to date. **EDIT: EDIT: I restarted my PC and it seems Windows Ink is working fine now. Proper pen pressure and no pressure spikes but instead Wintab gives me full pen pressure all the time. Weird...** **Exact steps for others to reproduce the error** Use a Huion tablet and sculpt something

Steffen Hartmann commented

2021-02-17 19:10:34 +01:00

Added subscriber: @Harti

blender-admin commented

2021-02-17 19:10:34 +01:00

#85760 was marked as duplicate of this issue

Steffen Hartmann commented

2021-02-17 19:11:06 +01:00

Added subscriber: @PrototypeNM1

Steffen Hartmann commented

2021-02-17 19:11:06 +01:00

@PrototypeNM1 Thats probably something for you

Steffen Hartmann commented

2021-02-17 19:28:09 +01:00

EDIT: I restarted my PC and it seems Windows Ink is working fine now. Proper pen pressure and no pressure spikes but instead Wintab gives me full pen pressure all the time. Weird...

Nicholas Rishel commented

2021-02-17 21:21:44 +01:00

Full pen pressure is a sign that the tablet is not being recognized (it's just acting as a mouse). I reverted the tablet handling to what existed in Blender 2.91 so it's surprising that it's not working now.

Note that Blender may need to be restarted after changing the Tablet API. Also could you find an old paste link from your prior issues so I can see what Wintab was doing at the time?

Full pen pressure is a sign that the tablet is not being recognized (it's just acting as a mouse). I reverted the tablet handling to what existed in Blender 2.91 so it's surprising that it's not working now. Note that Blender may need to be restarted after changing the Tablet API. Also could you find an old paste link from your prior issues so I can see what Wintab was doing at the time?

Steffen Hartmann commented

2021-02-18 12:04:00 +01:00

@PrototypeNM1 https://developer.blender.org/P1760

https://developer.blender.org/P1793

@PrototypeNM1 https://developer.blender.org/P1760 https://developer.blender.org/P1793

Philipp Oeser commented

2021-02-18 15:08:19 +01:00

Added subscribers: @Phigon, @lichtwerk

Nicholas Rishel commented

2021-02-18 19:00:29 +01:00

@Harti just to confirm, if you change the Tablet API and restart Blender, is that enough to make pressure work (until you change the API again)? Or does it require a full restart?

The issue of full pen pressure at the start is impractical to fix. Wintab works by bolting pressure and tilt information onto normal Windows mouse input, instead of using the position provided by Wintab. These two systems are not synchronized (also not practical to synchronize).

Older versions of Blender hid this problem decently well, but it's re-exposed again because high frequency mouse input breaks the heuristic which hid the problem.

@Harti just to confirm, if you change the Tablet API and restart Blender, is that enough to make pressure work (until you change the API again)? Or does it require a full restart? The issue of full pen pressure at the start is impractical to fix. Wintab works by bolting pressure and tilt information onto normal Windows mouse input, instead of using the position provided by Wintab. These two systems are not synchronized (also not practical to synchronize). Older versions of Blender hid this problem decently well, but it's re-exposed again because high frequency mouse input breaks the heuristic which hid the problem.

Steffen Hartmann commented

2021-02-18 21:26:03 +01:00

I only tested Windows Ink today and everything worked fine (except one or two pen pressure spike hickups - i believe). Will test more tomorrow. Haven't changed tablet API today.

Ovionis commented

2021-02-18 22:09:40 +01:00

I don't know what high frequency mouse input is but it sounds like something I'd rather not have.

Philipp Oeser commented

2021-02-22 11:44:00 +01:00

Looks like this is now handled in {#85844}?

Will merge these report (@PrototypeNM1 : correct me if I am wrong)

Looks like this is now handled in {#85844}? Will merge these report (@PrototypeNM1 : correct me if I am wrong)

Philipp Oeser commented

2021-02-22 11:44:17 +01:00

Closed as duplicate of #85844

Philipp Oeser closed this issue

2021-02-22 11:44:17 +01:00

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Start of a brush stroke always results with maximum pen pressure using Wintab and Windows Ink, latest 2.93 alpha and Huion WH1409 v2. #85747