public bool Intersects(FastBounds2D b)
{
var gap =
(max_x < b.min_x || b.max_x < min_x) ||
(max_y < b.min_y || b.max_y < min_y);
return(!gap);
}
public void Encapsulate(FastBounds2D fb)
{
Encapsulate(fb.min_x, fb.min_y);
Encapsulate(fb.max_x, fb.max_y);
}