The fillJointRadii() method of the XRFrame interface populates a Float32Array with radii for a list of hand joint spaces and returns true if successful for all spaces.

jointSpaces

An array of XRJointSpace objects for which to obtain the radii.

radii

A Float32Array that is populated with the radii of the jointSpaces.

A boolean indicating if all of the spaces have a valid pose.

TypeError

Thrown if the length of jointSpaces is larger than the number of elements in radii.

To efficiently get all radii for all 25 joints of each XRHand, you can use the fillJointRadii() method.

let radii1 = new Float32Array(25);
let radii2 = new Float32Array(25);

function onXRFrame(xrFrame, renderer) {
  let hand1 = xrFrame.session.inputSources[0].hand;
  xrFrame.fillJointRadii(hand1.values(), radii1);
  let hand2 = xrFrame.session.inputSources[1].hand;
  xrFrame.fillJointRadii(hand2.values(), radii2);
}

• XRHand
• XRJointSpace
• Float32Array