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mesh生成，中间挖洞

unity meshCollider 渲染面片问题踩坑

RTS框选功能

把这个脚本挂在球上就完事了using System.Collections;using System.Collections.Generic;using UnityEngine;public class ray : MonoBehaviour{ public float Speed; public Vector3 direction; public Vector3 OUT; // Start is called before the first frame upd