The getLightEstimate() method of the XRFrame interface returns an XRLightEstimate object containing estimated lighting values for a given XRLightProbe.

lightProbe

An XRLightProbe object containing the current lighting state for the frame.

An XRLightEstimate object or null if the device cannot estimate lighting for this frame.

Given a session's XRLightProbe, the getLightEstimate() method gets an XRLightEstimate object containing the lighting values for each frame.

const lightProbe = await xrSession.requestLightProbe();

// frame loop
function onXRFrame(time, xrFrame) {
  let lightEstimate = xrFrame.getLightEstimate(lightProbe);

  // Use light estimate data to light the scene

  // Available properties
  lightEstimate.sphericalHarmonicsCoefficients;
  lightEstimate.primaryLightDirection;
  lightEstimate.primaryLightIntensity;
}

• XRLightEstimate
• XRLightProbe