XRWebGLBinding: getDepthInformation() method

Limited availability

The getDepthInformation() method of the XRWebGLBinding interface returns an XRWebGLDepthInformation object containing WebGL depth information.

Syntax

getDepthInformation(view)

Parameters

• view
  • : An XRView object obtained from a viewer pose.

Return value

An XRWebGLDepthInformation object.

Exceptions

• NotSupportedError DOMException
  • : Thrown if "depth-sensing" is not in the list of enabled features for this XRSession.
• InvalidStateError DOMException
  • : Thrown if the XRFrame is not active nor animated. Obtaining depth information is only valid within the requestAnimationFrame() callback.
• InvalidStateError DOMException
  • : Thrown if the session’s depthUsage is not "gpu-optimized".

Examples

Obtaining WebGL depth information

const canvasElement = document.querySelector(".output-canvas");
const gl = canvasElement.getContext("webgl");
await gl.makeXRCompatible();

// Make sure to request a session with depth-sensing enabled
const session = navigator.xr.requestSession("immersive-ar", {
  requiredFeatures: ["depth-sensing"],
  depthSensing: {
    usagePreference: ["gpu-optimized"],
    formatPreference: ["luminance-alpha"],
  },
});

const glBinding = new XRWebGLBinding(session, gl);

// …

// Obtain depth information in an active and animated frame
function rafCallback(time, frame) {
  session.requestAnimationFrame(rafCallback);
  const pose = frame.getViewerPose(referenceSpace);
  if (pose) {
    for (const view of pose.views) {
      const depthInformation = glBinding.getDepthInformation(view);
      if (depthInformation) {
        // Do something with the depth information
        // gl.bindTexture(gl.TEXTURE_2D, depthInformation.texture);
        // …
      }
    }
  }
}

Specifications

Browser compatibility

See also

• texture