Function setAxisAngle

docs/demo/spritejs.worker.js:3971–3979

* Sets a quat from the given angle and rotation axis, * then returns it. * * @param {quat} out the receiving quaternion * @param {ReadonlyVec3} axis the axis around which to rotate * @param {Number} rad the angle in radians * @returns {quat} out

(out, axis, rad)

 **/

function setAxisAngle(out, axis, rad) {
  rad = rad * 0.5;
  var s = Math.sin(rad);
  out[0] = s * axis[0];
  out[1] = s * axis[1];
  out[2] = s * axis[2];
  out[3] = Math.cos(rad);
  return out;
}
/**
 * Gets the rotation axis and angle for a given
 *  quaternion. If a quaternion is created with