public Batch(List<_collider> colliders, CAABB bound)
{
this.colliders = colliders;
this.bound = bound;
}
public void MakeBound(AABB nbound)
{
if (cbound == null)
cbound = new CAABB(nbound.x, nbound.y, nbound.w, nbound.h);
else cbound.aabb = nbound;
}