getPose() returns the relative position and
orientation—the pose—of one
XRSpace to that of another space.
With this, you can observe the motion of objects relative to each other and to fixed
locations throughout the scene.
For example, to get the position of a controller relative to the
viewer's head, you would compare the controller's
gripSpace to the
XRReferenceSpace of type
var xrPose = xrFrame.getPose(space, baseSpace);
XRSpace specifying the space for which to obtain an
XRPose describing the item's position and orientation.
XRSpace to use as the base or origin for the purposes of computing
the relative position and orientation.
XRPose object specifying the position and orientation, relative to
XRSpace indicated by
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