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Add language to account for empty transform in XRReferenceSpaceEvent #1392

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Sep 24, 2024
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Add language to account for empty transform in XRReferenceSpaceEvent #1392

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4 changes: 3 additions & 1 deletion index.bs
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Expand Up @@ -2510,7 +2510,9 @@ dictionary XRReferenceSpaceEventInit : EventInit {

The <dfn attribute for="XRReferenceSpaceEvent">referenceSpace</dfn> attribute indicates the {{XRReferenceSpace}} that generated this event.

The <dfn attribute for="XRReferenceSpaceEvent">transform</dfn> attribute describes the post-event position and orientation of the {{XRReferenceSpaceEvent/referenceSpace}}'s [=native origin=] in the pre-event coordinate system.
The optional <dfn attribute for="XRReferenceSpaceEvent">transform</dfn> attribute describes the post-event position and orientation of the {{XRReferenceSpaceEvent/referenceSpace}}'s [=native origin=] in the pre-event coordinate system. This attribute MAY be `null` if the {{XRSystem}} can't determine the delta between the old and the new coordinate system.

NOTE: situations where {{XRReferenceSpaceEvent/referenceSpace}} or {{XRReferenceSpaceEventInit/referenceSpace}} can be when the headset was doffed and donned between 2 seperate locations. In such cases, if the experience relies on world-locked content, it should warn the user and reset the scene.

Event Types {#event-types}
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