public QuadTree()
{
root = new Node(null, new AABB(0,0,0,0), 0);
minmax = new AABB(0,0,0,0);
cols = new List<_collider>();
}
public void MakeBound(AABB nbound)
{
if (cbound == null)
cbound = new CAABB(nbound.x, nbound.y, nbound.w, nbound.h);
else cbound.aabb = nbound;
}