[Webkit-unassigned] [Bug 217043] New: Deviceorientation controls jumping/shaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217043

            Bug ID: 217043
           Summary: Deviceorientation controls jumping/shaky
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: christopher at planimals.net

See discussed issue from a few weeks ago at https://discourse.threejs.org/t/deviceorientation-controls-are-shaky/18548/2 and link to test (on iOS) https://threejs.org/examples/misc_controls_deviceorientation

That phenomenon was noted on iOS 13 in above post, but I just observed the same/similar phenomenon in iOS 14-- extreme jumpiness in tracking as well as paint bugs (after-images of 2D HTML/DOM elements persisting on/over a canvas element even after removed from DOM).

The referenced post using ThreeJS, and my own observed issue using A-Frame.js, are both using the DeviceOrientationControls code at https://github.com/mrdoob/three.js/blob/master/examples/jsm/controls/DeviceOrientationControls.js which uses the window.DeviceOrientationEvent for tracking.

As noted by the poster at the referenced link, a restart appears to address the issue, but I confess I'd never personally encountered the problem before, and seeing it posted so recently by another on iOS 13 and now suddenly experiencing it myself on iOS 14 makes me wonder if it is a newly emergent issue.

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