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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/XRWebGLBinding/getDepthInformation below:

XRWebGLBinding: getDepthInformation() method - Web APIs

Limited availability

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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

getDepthInformation(view)

view

An XRView object obtained from a viewer pose.

An XRWebGLDepthInformation object.

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".

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);
        // …
      }
    }
  }
}

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