unity3d立方体碰撞检测（c#代码实现）

xiaoguangit 2019-08-01 原文

由于unity自带的碰撞组件特别耗费性能，网上的unity物体碰撞的c#代码实现比较少，没有适合的，只能自己写一个来用：

using System;
using System.Collections.Generic;
using UnityEngine;

namespace Assets
{
    class Class1 : MonoBehaviour
    {
        List<Action> listAction = new List<Action>();
        //用来检测碰撞的间隔时间（可以直接把检测放入update()中，不过100毫秒的定时器效果上也能实现）
        System.Timers.Timer timer = new System.Timers.Timer();
        //原坐标
        Vector3 oldPoint;
        //要移动的坐标
        Vector3 point;
        //0:待机;1:移动
        int currentState = 0;
        //是否可以移动
        bool canMove = true;

        // Use this for initialization
        void Start()
        {
            oldPoint = transform.position;
            timer.Interval = 100;
            timer.Enabled = true;
            timer.Elapsed += (a, b) => isMove(point);
        }

        // Update is called once per frame
        void Update()
        {
            foreach (Action a in listAction) {
                a();
            }
            listAction.Clear();
            point = transform.position;
            if (currentState == 1) {
                if (checkCollision()) {
                    canMove = false;
                }
            }
        }

        void isMove(Vector3 position) {
            if (oldPoint != position)
            {
                if (!canMove)
                {
                    listAction.Add(new Action(()=> gameObject.transform.position = oldPoint));
                    canMove = true;
                }
                else {
                    currentState = 1;
                    oldPoint = position;
                }
            }
            else {
                currentState = 0;
            }
        }

        bool checkCollision() {
            Vector3 zzPoint = gameObject.transform.position;
            Vector3 zzScale = gameObject.transform.localScale;
            //另一物体坐标信息
            GameObject dm = GameObject.Find("Cube (1)");
            Vector3 dmPoint = dm.transform.position;
            Vector3 dmScale = dm.transform.localScale;

            //坐标检测（当两个物体的x、y、z方向间距都小于两个物体在该方向上的长度）
            if ((Math.Abs(zzPoint.x - dmPoint.x) <= zzScale.x / 2 + dmScale.x / 2) &&
                (Math.Abs(zzPoint.y - dmPoint.y) <= zzScale.y / 2 + dmScale.y / 2) &&
                (Math.Abs(zzPoint.z - dmPoint.z) <= zzScale.z / 2 + dmScale.z / 2))
            {
                return true;
            }
            return false;
        }
    }
}