T[] GetCollisionObjectsFromAChild(Vector2 checkPoint, float checkRadius, QuadtreeWithUpdate <T> child)
{
if (child._field.PointToFieldDistance(checkPoint) <= _maxRadius + checkRadius) //这里不光要考虑到检测半径，还要考虑到节点最大半径
{
return(child.CheckCollision(checkPoint, checkRadius));
}
return(new T[0]);
}
public static GameObject[] CheckCollision(Vector2 checkPoint, float checkRadius)
{
return(_quadtree.CheckCollision(checkPoint, checkRadius));
}