Graphics Pen Tablet Input Broken with version 2.77 and 2.77a #48129
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Reference: blender/blender#48129
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System Information
Windows 7
Nvidia Gefore GTX 970 (driver version 10.18.13.6451)
Monoprice 8" x 6" Graphics Tablet (#13653) (UGTizer Driver version 6.1.7600.16385)
Driver links: http://driverlibs.com/download/PenTablet-Device
http://driverlibs.com/download/PenTablet-TabletPC-driver
Blender Version
Broken: 2.77a 2016-04-05 18:12 Hash:
abf6f08Worked: 2.76b 2015-Nov-04 07:53:43
After starting Blender 2.77(a), the every cursor input with the pen tablet (in absolute positioning mode) locks the cursor to one position (2.77 the coordinates are 0,0 and 2.77a the coordinates are 1476,0). Using the mouse will move the cursor away from these coordinates but every subsequent pen tablet input will lock the cursor back to the listed coordinates. If any of the buttons of the Pen are depressed, the cursor will move to the actual coordinates but this will not allow cursor input.
Link to Screen Captures
http://imgur.com/a/17OMN (Note the "Mouse Pos" application window)
Exact steps for others to reproduce the error
Changed status to: 'Open'
Added subscriber: @neuone
Added subscriber: @tompov
I don't know, if it's a similar porblem with my wacom tablet, I had a few days ago:
Here it was caused by no longer existing blender-app.exe in latest Blenderversions.
My Blender specific Wacomsettings pointed to this file. After changing this target to blender.exe all was fine again.
Added subscriber: @JulianEisel
That would make sense, @neuone, can you confirm that this works?
The tablet I'm using doesn't have any application specific settings so I don't think that is the issue.
@tompov and @JulianEisel I may have found the source of the bug. It looks like the functions GHOST_WindowWin32.processWin32TabletInitEvent() and GHOST_WindowWin32.processWin32TabletEvent() functions weren't parsing the cursor X,Y,Z locations (they weren't defined in GHOST_WindowWin32.h). I'm going to do some further testing before I submit any changes but right now my tablet is working with my debug build.
Added subscriber: @mont29
@neuone any news on this one?
@mont29 unfortunately no. I've been too busy with work to devote any time to this bug this week. It seems like tablet input hasn't been completely fleshed out in GHOST. This problem seems to be tied to how blender grabs and processes a system tablet or mouse event, even when blender is not the application that is in focus. I have found only one application that can maintain control of a system tablet event while Blender is running: the tablet driver settings panel. When I defined the PACKETDATA PK_X, PK_Y, and PK_Z GHOST stopped hijacking the cursor. This lead to the discovery of another bug (not really a bug, more of a lack of implementation) though: the cursor wrap/warp functions don't know how to handle input from an absolute positioning device and the warp/wrap funtions cause the cursor delta to change more rapidly. Say you're translating in X just a few units, when the cursor moves out of the viewport, the translation will shoot up an order of magnitude.
This bug will probably require the attention of someone more knowledgeable than myself.
Added subscriber: @brecht
Changed status from 'Open' to: 'Archived'
Pressure input on Windows has been completely changed since this was reported. Closing under the assumption that this was fixed, can reopen if it's not the case.