public bool Overlaps(AABB aabb)
{
Vector3 diff = aabb.ClosestPoint(center) - center;
return(diff.Dot(diff) <= (radius * radius));
}
public bool Overlaps(AABB other)
{
// test for not overlapped as it exits faster
return(!(max.x < other.min.x || max.y < other.min.y ||
min.x > other.max.x || min.y > other.max.y));
}