XRHitTestSource

The XRHitTestSource interface of the WebXR Device API handles hit test subscriptions. You can get an XRHitTestSource object by using the XRSession.requestHitTestSource() method.

This object doesn't itself contain hit test results, but it is used to compute hit tests for each XRFrame by calling XRFrame.getHitTestResults(), which returns XRHitTestResult objects.

Instance properties

None.

Instance methods

XRHitTestSource.cancel() Experimental

Unsubscribes from the hit test.

Examples

Getting an XRHitTestSource object for a session

Call XRSession.requestHitTestSource() to get a hit test source.

const xrSession = navigator.xr.requestSession("immersive-ar", {
  requiredFeatures: ["local", "hit-test"],
});

let hitTestSource = null;

xrSession
  .requestHitTestSource({
    space: viewerSpace, // obtained from xrSession.requestReferenceSpace("viewer");
    offsetRay: new XRRay({ y: 0.5 }),
  })
  .then((viewerHitTestSource) => {
    hitTestSource = viewerHitTestSource;
  });

// frame loop
function onXRFrame(time, xrFrame) {
  let hitTestResults = xrFrame.getHitTestResults(hitTestSource);

  // do things with the hit test results
}

Unsubscribe from hit test

To unsubscribe from a hit test source, call XRHitTestSource.cancel(). Since the object will no longer be usable, you can clean up and set the XRHitTestSource object to null.

hitTestSource.cancel();
hitTestSource = null;

Specifications

Browser compatibility

See also

• XRTransientInputHitTestSource