The XRRay interface of the WebXR Device API is a geometric ray described by an origin point and a direction vector.

XRRay objects can be passed to XRSession.requestHitTestSource() or XRSession.requestHitTestSourceForTransientInput() to perform hit testing.

XRRay() Experimental

Creates a new XRRay object.

XRRay.direction Read only Experimental

A DOMPointReadOnly representing the ray's 3-dimensional directional vector.

XRRay.matrix Read only Experimental

A transform that can be used to position objects along the XRRay. This is a 4 by 4 matrix given as a 16 element Float32Array in column major order.

XRRay.origin Read only Experimental

A DOMPointReadOnly representing the 3-dimensional point in space that the ray originates from, in meters.

None.

The XRSession.requestHitTestSource() method takes an XRRay object for its offsetRay option. In this example, the hit test source is positioned slightly above the viewer as the application has some UI elements at the bottom while wanting to maintain the perception of a centered cursor.

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;
  });

• XRSession.requestHitTestSource()
• XRHitTestResult