method extend

Source

void extend(Point3 point) {
  Vector3 newMin = new Vector3.zero(), newMax = new Vector3.zero();
  Vector3.min(minCorner, point, newMin);
  Vector3.max(maxCorner, point, newMax);
  minCorner = new Point3.vec(newMin);
  maxCorner = new Point3.vec(newMax);
}