A WebXR Device API
XRFrame object is passed into the
requestAnimationFrame() callback function and provides access to the information needed in order to render a single frame of animation for an
XRSession describing a VR or AR scene. Events which communicate the tracking state of objects also provide an
XRFrame reference as part of their structure.
In addition to providing a reference to the
XRSession for which this frame is to be rendered, the
getViewerPose() method is provided to obtain the
XRViewerPose describing the viewer's position and orientation in space, and
getPose() can be used to create an
XRPose describing the relative position of one
XRSpace relative to another.