XRLightEstimate: primaryLightDirection property

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

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The read-only primaryLightDirection property of the XRLightEstimate interface returns a DOMPointReadOnly representing the direction to the primary light source from the probeSpace of an XRLightProbe.


A DOMPointReadOnly object. If no estimated values from the user's environment are available, the point will be { x: 0.0, y: 1.0, z: 0.0, w: 0.0 }, representing a light shining straight down from above.


Within an XRFrame loop, you can use the primaryLightDirection and primaryLightIntensity properties to render shadows based on the most prominent light source, for example.

const lightProbe = await xrSession.requestLightProbe();

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

  // Render lights

  // Available properties


WebXR Lighting Estimation API Level 1
# dom-xrlightestimate-primarylightdirection

Browser compatibility

BCD tables only load in the browser

See also