max = (out, a, b) => {
  out[0] = Math.max(a[0], b[0])
  out[1] = Math.max(a[1], b[1])
  out[2] = Math.max(a[2], b[2])
  return out
}
Returns the maximum coordinates of the given vectors.

@param {vec3} out - receiving vector
@param {vec3} a - first operand
@param {vec3} b - second operand
@returns {vec3} out
@alias module:modeling/maths/vec3.max