Unity---视窗坐标转化和判断物体是否出了屏幕边界

视窗坐标转世界坐标和屏幕坐标，判断物体是否还在边界内，和判断从那边出界，先看效果：

这里是直接拖动物体改变坐标来检测，从图中的打印可以清楚看到效果，旋转摄像机视角是同样的效果，下面是代码：

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class Test : MonoBehaviour
{public Transform player;public float myWidth;public float myHeight;void Start(){Debug.Log("Screen.width" + Screen.width);Debug.Log("Screen.height" + Screen.height);}void Update(){CornerPos();}void CornerPos(){/// <summary>/// 视窗坐标转世界坐标。视窗坐标是以视窗左下角（0,0）坐标为起始点，长宽为1./// </summary>Vector3 LeftUpWorldoCornerPos = Camera.main.ViewportToWorldPoint(new Vector3(0, 1, -Camera.main.transform.position.z));//视窗左上角转为世界坐标Vector3 LeftDownWorldCornerPos = Camera.main.ViewportToWorldPoint(new Vector3(0, 0, -Camera.main.transform.position.z));//视窗左下角转为世界坐标Vector3 RightUpWorldCornerPos = Camera.main.ViewportToWorldPoint(new Vector3(1, 1, -Camera.main.transform.position.z));//视窗右上角转为世界坐标Vector3 RightDownWorldCornerPos = Camera.main.ViewportToWorldPoint(new Vector3(1, 0, -Camera.main.transform.position.z));//视窗右下角转为世界坐标/// <summary>/// 视窗坐标转世界屏幕，可以手动得到其屏幕长宽/// </summary>Vector3 LeftUpScreenCornerPos = Camera.main.ViewportToScreenPoint(new Vector3(0, 1, -Camera.main.transform.position.z));//视窗左上角转为屏幕坐标Vector3 LeftDownScreenCornerPos = Camera.main.ViewportToScreenPoint(new Vector3(0, 0, -Camera.main.transform.position.z));//视窗左下角转为屏幕坐标Vector3 RightUpScreenCornerPos = Camera.main.ViewportToScreenPoint(new Vector3(1, 1, -Camera.main.transform.position.z));//视窗右上角转为屏幕坐标Vector3 RightDownScreenCornerPos = Camera.main.ViewportToScreenPoint(new Vector3(1, 0, -Camera.main.transform.position.z));//视窗右下角转屏幕界坐标myWidth = Vector3.Magnitude(LeftUpScreenCornerPos - RightUpScreenCornerPos);myHeight = Vector3.Magnitude(LeftUpScreenCornerPos - LeftDownScreenCornerPos);/// <summary>/// 视窗坐标转世界坐标。得到四个视窗中心点的世界坐标，与物体判断是否到达边界./// </summary>Vector3 upMiddlePos = Camera.main.ViewportToWorldPoint(new Vector3(0.5f, 1f, -Camera.main.transform.position.z)); //视窗上方中心转为世界坐标Vector3 downMiddlePos = Camera.main.ViewportToWorldPoint(new Vector3(0.5f, 0, -Camera.main.transform.position.z));//视窗下方中心转为世界坐标Vector3 leftMiddlePos = Camera.main.ViewportToWorldPoint(new Vector3(0, 0.5f, -Camera.main.transform.position.z));//视窗左边中心转为世界坐标Vector3 rightMiddlePos = Camera.main.ViewportToWorldPoint(new Vector3(1, 0.5f, -Camera.main.transform.position.z));//视窗右边中心转为世界坐标bool upOut = upMiddlePos.y - player.position.y <= 0 ? true : false; //与上方屏幕边缘碰到否bool downOut = downMiddlePos.y - player.position.y >= 0 ? true : false;//与下方屏幕边缘碰到否bool leftOut = leftMiddlePos.x - player.position.x >= 0 ? true : false;//与左边屏幕边缘碰到否bool rightOut = rightMiddlePos.x - player.position.x <= 0 ? true : false;//与右边屏幕边缘碰到否Debug.Log("upOut : " + upOut);Debug.Log("downOut : " + downOut);Debug.Log("leftOut : " + leftOut);Debug.Log("rightOut : " + rightOut);}
}

注释很清楚了，这里的Player就是Cube.

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