XRReferenceSpaceEvent: transform property
The read-only XRReferenceSpaceEvent
property
transform
indicates the position and orientation of the
affected referenceSpace
's
native origin after the changes the event represents are applied. The
transform
is defined using the old coordinate system, which allows it to be
used to convert coordinates from the pre-event coordinate system to the post-event
coordinate system.
Value
An XRRigidTransform
object providing a transform that can be used to
convert coordinates from the pre-event coordinate system to the post-event coordinate
system.
Usage notes
Upon receiving a reset
event, you can apply the transform
to
cached position or orientation information to shift them into the updated coordinate
system. Alternatively, you can just discard any cached positional information and
recompute from scratch. The approach you take will depend on your needs.
For details on what causes a reset
event and how to respond, see the
reset
event's documentation.
Examples
This example handles the reset
event by walking through all the objects in
a scene, updating each object's position by multiplying it with the event's given
transform
. The scene is represented by a scene
object, with
all the objects in an array called objects
within it.
js
xrReferenceSpace.addEventListener("reset", (event) => {
for (const obj of scene.objects) {
mat4.multiply(obj.transform, obj.transform, event.transform);
}
});
Specifications
Specification |
---|
WebXR Device API # dom-xrreferencespaceevent-transform |
Browser compatibility
BCD tables only load in the browser