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Maniphest T85844

Stylus pressure splike on first dab
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.92.0 Release Candidate, branch: master, commit date: 2021-02-19 18:02, hash: rBb1142858d4ca
Worked: 2.91.2

Short description of error
When using stylus(me wacom CTL-690),the first dab of a stroke has a too high pressure amount regardless of the actual pressure input.
The left stroke of each pair in the following pictures is drawn within Blender 2.92.0 and the right one is 2.91.2:

As what I have tested,sculpting,texture paint,weight paint and grease pencil all get influenced.

Exact steps for others to reproduce the error
OS Conditon: WIN 10 |Blender: 2.92.0 Candidate|Tablet: Wacom CTL-690

  • Using stylus to draw a stroke in sculpt mode , texture paint mode , weight paint mode or grease pencil draw mode .Try having the pressure initially low,then the first dab drawn should get a high pressure amount which is false.

In case,this is the blend file which is used to capture the pictures above:

BugReport.blend1 MBDownload

Revisions and Commits

rB Blender
rBee4f30650967 Fix T85844: high pressure at start of line.
D10507rB37afeb7eaa8c Fix T85844: high pressure at start of line.

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Event Timeline

炎臻 (PrettyFireNOI7) created this task.Sun, Feb 21, 2:44 PM
炎臻 (PrettyFireNOI7) updated the task description. (Show Details)
炎臻 (PrettyFireNOI7) mentioned this in T85733: Spikes when using tablet.Mon, Feb 22, 3:03 AM
Nicholas Rishel (nicholas_rishel) changed the task status from Needs Triage to Confirmed.EditedMon, Feb 22, 4:34 AM
Nicholas Rishel (nicholas_rishel) triaged this task as Low priority.
Nicholas Rishel (nicholas_rishel) added a subscriber: Nicholas Rishel (nicholas_rishel).

Note to anyone looking into this issue:

This issue is a result of Win32 mouse input not being synchronized with Wintab pressure. This has been an issue before 2.92, and has reappeared because the heuristics which discourage it from happening no longer work as well because Win32 mouse input was modified to support more accurate mouse movement (smooth lines when drawing).

There is no good long term fix, the issue is how Wintab works and the compromises to support current workflows in Blender.

The fix for this issue is to use Windows Ink (may require restarting Blender).

炎臻 (PrettyFireNOI7) added a comment.Mon, Feb 22, 7:20 AM

This issue might needs other stylus or Wacom tablet users.I can't find a way to enable Windows Ink only while keeping my tablet functioning.
"Use Windows Ink" setting in Wacom driver can't fix this problem and possibly my tablet is too old to work correctly without Wacom driver.

炎臻 (PrettyFireNOI7) mentioned this in T85863: Pressure sensitive brushes have an initial hard mark in the beginning.Mon, Feb 22, 7:25 AM
Nicholas Rishel (nicholas_rishel) merged a task: T85863: Pressure sensitive brushes have an initial hard mark in the beginning.Mon, Feb 22, 8:31 AM
Nicholas Rishel (nicholas_rishel) added a subscriber: kursad k (kursadk).
Philipp Oeser (lichtwerk) mentioned this in T85851: First press of the pen gives wrong result.Mon, Feb 22, 11:37 AM
Philipp Oeser (lichtwerk) merged a task: T85851: First press of the pen gives wrong result.
Philipp Oeser (lichtwerk) added subscribers: Roman (roman13), Philipp Oeser (lichtwerk).
Philipp Oeser (lichtwerk) mentioned this in T85747: Start of a brush stroke always results with maximum pen pressure using Wintab and Windows Ink, latest 2.93 alpha and Huion WH1409 v2..Mon, Feb 22, 11:44 AM
Philipp Oeser (lichtwerk) merged a task: T85747: Start of a brush stroke always results with maximum pen pressure using Wintab and Windows Ink, latest 2.93 alpha and Huion WH1409 v2..
Philipp Oeser (lichtwerk) added subscribers: Steffen Hartmann (Harti), Ovionis (Phigon).
Philipp Oeser (lichtwerk) added subscribers: Dalai Felinto (dfelinto), Brecht Van Lommel (brecht).Mon, Feb 22, 11:46 AM

@Nicholas Rishel (nicholas_rishel) : is this really Low priority?
(Looks like this is a regression?)

CC @Brecht Van Lommel (brecht)
CC @Dalai Felinto (dfelinto)

Brecht Van Lommel (brecht) raised the priority of this task from Low to High.Mon, Feb 22, 12:14 PM

@Nicholas Rishel (nicholas_rishel) please revert all high frequency mouse input changes as well then.

Correct tablet input is more important than high frequency mouse input.

Brecht Van Lommel (brecht) edited projects, added BF Blender (2.92), Platform: Windows; removed BF Blender.Mon, Feb 22, 12:14 PM
Dalai Felinto (dfelinto) moved this task from Backlog to bcon4: Show Stoppers on the BF Blender (2.92) board.Mon, Feb 22, 1:05 PM
kursad k (kursadk) added a comment.Mon, Feb 22, 5:09 PM
In T85844#1116568, @炎臻 (PrettyFireNOI7) wrote:

This issue might needs other stylus or Wacom tablet users.I can't find a way to enable Windows Ink only while keeping my tablet functioning.
"Use Windows Ink" setting in Wacom driver can't fix this problem and possibly my tablet is too old to work correctly without Wacom driver.

Blender offers an option to choose "Windows Ink" under "Input" settings, see if you are able to change it.

kursad k (kursadk) added a comment.EditedMon, Feb 22, 5:13 PM

>>! In T85844#1116544, @Nicholas Rishel (nicholas_rishel) wrote:

Note to anyone looking into this issue:

This issue is a result of Win32 mouse input not being synchronized with Wintab pressure. This has been an issue before 2.92, and has reappeared because the heuristics which discourage it from happening no longer work as well because Win32 mouse input was modified to support more accurate mouse movement (smooth lines when drawing).

There is no good long term fix, the issue is how Wintab works and the compromises to support current workflows in Blender.

The fix for this issue is to use Windows Ink (may require restarting Blender).

I do not think that Windows Ink can handle multiple devices properly , as in using Blender with one device initially (Intuos pro) then turning on another device and keep using the open Blender in another device (Wacom Cintiq). My tests show that Blender cant utilize the pressure when I change to Wacom Cintiq while Windows Ink is the main driver.

Can Windows Ink in Blender handle transient usages between multiple pen devices like this in the same opened session?

Nicholas Rishel (nicholas_rishel) added a parent task: T85874: Fix remaining tablet regression issues.Mon, Feb 22, 5:54 PM
Nicholas Rishel (nicholas_rishel) claimed this task.Mon, Feb 22, 7:44 PM
炎臻 (PrettyFireNOI7) added a comment.EditedTue, Feb 23, 3:16 AM
In T85844#1117075, @kursad k (kursadk) wrote:
In T85844#1116568, @炎臻 (PrettyFireNOI7) wrote:

This issue might needs other stylus or Wacom tablet users.I can't find a way to enable Windows Ink only while keeping my tablet functioning.
"Use Windows Ink" setting in Wacom driver can't fix this problem and possibly my tablet is too old to work correctly without Wacom driver.

Blender offers an option to choose "Windows Ink" under "Input" settings, see if you are able to change it.

Thank you for the information,had never known there is a setting.I got a solution currently from that and this solves the pressure first-spike and the drawing glitches(T85733) for my Wacom CTL-690.

After changing Blender Tablet API from "Aotomatic" to "Windows Ink" in the preference (restarting Blender might be needed):
If Blender the application is specified in the Wacom driver,make sure the "Use Windows Ink" check box is on in the Mapping tab,according to Wacom Guide this setting will let the tablet get the proper pressure input ( if the setting is not checked,stylus will have no pressure in Blender) :
If Blender is not specified in the Wacom driver,check "Use Windows Ink" setting in the "All Other Applications" Mapping tab.
Issue happens while the Tablet API in Blender is set to Wintab.

Nicholas Rishel (nicholas_rishel) added a comment.Tue, Feb 23, 6:25 AM

All: this build reverts changes to that caused this issue. Please +1 if this fixes things for you or comment if there is still an issue.

炎臻 (PrettyFireNOI7) added a comment.Tue, Feb 23, 8:12 AM
In T85844#1117427, @Nicholas Rishel (nicholas_rishel) wrote:

All: this build reverts changes to that caused this issue. Please +1 if this fixes things for you or comment if there is still an issue.

Glitches(T85733) are gone for me (Tablet API changed to Wintab/Automatic).
The pressure error is still there when I use Wintab/Automatic Tablet API.

Falk David (filedescriptor) mentioned this in T85902: Grease Pencil default pencil in 2.92RC look and feel like ink unlike in 2.91.2.Tue, Feb 23, 10:48 AM
Falk David (filedescriptor) mentioned this in T85901: Brush Radius Pressure Sensitivity In Texture Paint Not Working.
Nicholas Rishel (nicholas_rishel) merged a task: T85902: Grease Pencil default pencil in 2.92RC look and feel like ink unlike in 2.91.2.Tue, Feb 23, 5:43 PM
Nicholas Rishel (nicholas_rishel) merged a task: T85901: Brush Radius Pressure Sensitivity In Texture Paint Not Working.
Nicholas Rishel (nicholas_rishel) added subscribers: Jeannot Landry (Jeannot), Falk David (filedescriptor).
Nicholas Rishel (nicholas_rishel) added a subscriber: Jerome (BlenderPretender).
Nicholas Rishel (nicholas_rishel) added a comment.EditedTue, Feb 23, 6:14 PM

Updated build to test, I don't think it will fix the issue but it would rule out a large section of code as the problem.

Edit: the above build should fix things.

Nicholas Rishel (nicholas_rishel) mentioned this in D10507: Revert high fequency mouse input for Windows..Tue, Feb 23, 7:41 PM
Jerome (BlenderPretender) added a comment.Tue, Feb 23, 7:49 PM

Falk David, I tried the test build provided on the referenced task (T85844) and the problem with the pressure sensitivity was resolved.

Nicholas Rishel, I downloaded the test build provided by your link on task (T85844) at: https://blender.community/c/graphicall/lsbbbc/.
Please be advised, my virus scanner found and deleted two files from that build. Attached is a screen capture of the files that were deleted. I do not know if those are standard Blender files or actually malicious as the scanner suggests. Just be advised.

Nicholas Rishel (nicholas_rishel) closed this task as Resolved by committing rB37afeb7eaa8c: Fix T85844: high pressure at start of line..Tue, Feb 23, 8:31 PM
Nicholas Rishel (nicholas_rishel) added a commit: rB37afeb7eaa8c: Fix T85844: high pressure at start of line..
Nicholas Rishel (nicholas_rishel) added a commit: rBee4f30650967: Fix T85844: high pressure at start of line..Tue, Feb 23, 10:31 PM
炎臻 (PrettyFireNOI7) mentioned this in T85983: Reapparing of stylus glithces and pressure issue.Thu, Feb 25, 1:57 PM