The transform
read-only attribute of the XRPose
interface is a XRRigidTransform
object providing the position and orientation of the pose relative to the base XRSpace
as specified when the pose was obtained by calling XRFrame.getPose()
.
An XRRigidTransform
which provides the position and orientation of the XRPose
relative to the XRFrame
to which this XRPose
is aligned. This is the same pose that's returned by the frame's getPose()
method.
This handler for the XRSession
event select
handles events for tracked pointers. It determines the targeted object by passing the event frame's pose into a function called findTargetUsingRay()
, then dispatches the event differently depending on the user's handedness; this is done by comparing the value of the XRInputSource
property handedness
to a value in the variable user.handedness
. If the source is a controller in the user's primary hand, a function is called on the targeted object called primaryAction()
; otherwise, it calls the targeted object's offHandAction()
function.
xrSession.addEventListener("select", (event) => {
let source = event.inputSource;
let frame = event.frame;
let targetRayPose = frame.getPose(source.targetRaySpace, myRefSpace);
let targetObject = findTargetUsingRay(targetRay.transform.matrix);
if (source.targetRayMode === "tracked-pointer") {
if (source.handedness === user.handedness) {
targetObject.primaryAction();
} else {
targetObject.offHandAction();
}
}
});