function max(a, b, dst) {
  dst = dst || new VecType(3);
  dst[0] = Math.max(a[0], b[0]);
  dst[1] = Math.max(a[1], b[1]);
  dst[2] = Math.max(a[2], b[2]);
  return dst;
}
Return max values of two vectors.
Given vectors a and b returns
[max(a[0], b[0]), max(a[1], b[1]), max(a[2], b[2])].
@param {module:twgl/v3.Vec3} a Operand vector.
@param {module:twgl/v3.Vec3} b Operand vector.
@param {module:twgl/v3.Vec3} [dst] vector to hold result. If not new one is created.
@return {module:twgl/v3.Vec3} The max components vector.
@memberOf module:twgl/v3