Touch on Gizmos can return invalid cursor coordinates #59836
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Reference: blender/blender#59836
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Blender Version
version: 2.80 (sub 39), branch: blender2.7, commit date: 2018-12-23 21:42, hash:
e5e885d0ec, type: Releasebuild date: 23/12/2018, 17:14
platform: Windows
Short description of error
When using a pen, as in a Microsoft Surface or similar device, using the camera Gizmos and moving the pen outside the 3D viewport seems to return null/invalid coordinates, and it breaks. They can ONLY be used inside the 3D viewport. It's an absolute deal breaker for touch screen users (Surface, Wacom, etc)
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Any default .blender. On a touch device using a stylus pen, click on a Gizmo (axis, zoom, or drag) and move the pen outside the 3D viewport.
When using a regular mouse the cursor gets hidden and it works as intended.
Added subscriber: @Evigmae
#68543 was marked as duplicate of this issue
Added subscribers: @brecht, @ZedDB
@brecht anyone I can assign this to?
Added subscribers: @JulianEisel, @ideasman42
@ZedDB, possibly @ideasman42 or @JulianEisel if it's specific to gizmos.
@Evigmae, do you have "Continuous Grab" enabled under "Preferences > Input"? Does the same issue happen when dragging on number buttons to change the value? When translating objects in the viewport? Or is it only an issue with these gizmos?
Yes, this is with "Continuous Grab" enabled, as it comes by default.
Translating objects also breaks when moving the pen/touch outside the 3D viewport.
But dragging number on sliders works fine.
However, disabling "Continuous Grab" does the trick as it lets you move the pen/touch outside the 3D viewport while still holding focus on the gizmo or object while returning a valid value.
This should be readily available information for artists using touch devices.
The issue is we need to detect if events are absolute, current code assumes tablet events are absolute but we don't yet detect touch input.
Added subscriber: @PrototypeNM1
When I tested gizmos with the Windows Ink API I could not reproduce for pen input with continuous grab. Touch is still broken.
Added subscriber: @9Laos
Heads up that I'm working on touchscreen support which will address or obviate the touch issue.
Added subscriber: @seanr
I see this on a trackpad all the time (mid-2015 MacBook Pro). It's a real problem when rotating the view (sometimes it'll completely flip the view upside-down, for example) or zooming (sudden jumps in zoom distance). This when coupled with lack of proper undo for camera and view movements is worse than annoying - it can completely break a scene setup and needs to be a high priority to fix.
Touch/Pen on Gizmos can return invalid cursor coordinatesto Touch on Gizmos can return invalid cursor coordinatesAdded subscriber: @chbug
@PrototypeNM1 Hey Nicholas, I was wondering if you're still planning to work on this, as I might give it a try otherwise, as a starter project to familiarize myself with the touch/pen API.
@chbug heads up I pm'ed you on blender.chat to follow up.
We chatted, and Nicholas found a better started project for me, so I won't follow up on this one.