Repository navigation
Grabbable product after teleportation via rig #5854
Description
Video https://video.benetou.fr/w/gXstMXhX3WqtaPd2ypiCHK on A-Frame Version: 1.8.0 (Date 2026-06-23, Commit #47a08f1c)
Behavior : position and rotation are fine while at origin. Position and rotation are off while away from origin after teleporting.
Expected behavior : identical manipulation at origin and away from it.
<a-entity id="rig" position="0 0 0">
<a-entity id="camera" position="0 1.6 0" camera look-controls></a-entity>
<a-entity id="leftHand" hand-tracking-controls="hand: left;"></a-entity>
<a-entity id="rightHand" hand-tracking-grab-controls="hand: right;"></a-entity>
</a-entity>{ key: 'h', action: 'rig.object3D.translateX(-1)'},
{ key: 'l', action: 'rig.object3D.translateX(1)'},
{ key: 'j', action: 'rig.object3D.translateZ(-1)'},
{ key: 'k', action: 'rig.object3D.translateZ(1)'},
Activity
mrxz commentedon Sep 22, 2026
I thought it might've been the
obb-collidernot thehand-tracking-grab-controlsas the latter only reparents upon grab and release. But the flying off behaviour appears to be due to numerical instability, or at least something that happens each tick. Though looking more into it, I'm not entirely sure yet.mrxz commentedon Sep 22, 2026
Found the cause, turns out the
wristObjectofhand-tracking-controlswasn't taking the world transform into account. This resulted in the wrist object always being relatively close/near the origin and acting as a "pivot" of sorts when grabbing and moving objects.I've created a PR with a fix for this #5855. Until this change gets merged and lands in a release, you can monkey-patch it: https://krabbel.dev/p/fair-chefs-boil
Utopiah commentedon Sep 22, 2026
Yep that does it, much appreciated for the explanation, the PR and even the monkey patch to test and fix instantly 🙇