本文共 3468 字，大约阅读时间需要 11 分钟。

雾化效果的实现是通过已经生成的像素的颜色和像素到镜头的距离来确定一个常量色来实现的，使用雾化i更不会改变已经混合的像素的透明度值，只是改变了RGB的值。

Demo：

using System.Collections;using System.Collections.Generic;using UnityEngine;public class Pop : MonoBehaviour{       private float ypos1 = 0.0f;//声明边框一的位置    private float ypos2 = 0.0f;//生命边框二的位置    private float ypos3 = 0.0f;//声明边框三的位置    private float ypos4 = 0.0f;//声明边框四的位置    private bool isshowDropdownButton;//声明默认下拉按钮值    private bool isshowDropupButton;//声明回弹按钮值    public float speed = 500.0f;//声明弹出弹回速度    private string St = "FogMode";    // Start is called before the first frame update    void Start()    {               }    // Update is called once per frame    void Update()    {           if(isshowDropdownButton == true)        {               ypos1 += Time.deltaTime * speed;            ypos2 += Time.deltaTime * speed;            ypos3 += Time.deltaTime * speed;            ypos4 += Time.deltaTime * speed;            if(ypos1>=60)            {                   ypos1 = 60;            }            if(ypos2>=120)            {                   ypos2 = 120;            }            if(ypos3>=180)            {                   ypos3 = 180;            }            if(ypos4 >= 240)            {                   ypos4 = 240;            }            if(isshowDropupButton == true)            {                   ypos1 -= Time.deltaTime * speed;                ypos2 -= Time.deltaTime * speed;                ypos3 -= Time.deltaTime * speed;                ypos4 -= Time.deltaTime * speed;                if(ypos1>=0||ypos2>=0||ypos3>=0||ypos4>=0)                {                       isshowDropupButton = false;                    isshowDropdownButton = false;                    ypos1 = 0;                    ypos2 = 0;                    ypos3 = 0;                    ypos4 = 0;                }            }        }    }    private void OnGUI()    {           if(isshowDropdownButton == false)        {               if(GUI.RepeatButton(new Rect(50,0,200,60),St))            {                   isshowDropdownButton = true;            }        }        if(isshowDropdownButton == true)        {               if(GUI.Button(new Rect(50,0,200,60),St))            {                   isshowDropdownButton = false;                isshowDropupButton = true;            }            if(GUI.Button(new Rect(50,ypos1,200,60),"Linear"))            {                   isshowDropupButton = true;                isshowDropdownButton = false;                RenderSettings.fogMode = FogMode.Linear;            }            if(GUI.Button(new Rect(50,ypos2,200,60),"Exp2"))            {                   isshowDropupButton = true;                isshowDropdownButton = false;                RenderSettings.fogMode = FogMode.ExponentialSquared;            }            if(GUI.Button(new Rect(50,ypos3,200,60),"Exp"))            {                   isshowDropupButton = true;                isshowDropdownButton = false;                RenderSettings.fogMode = FogMode.Exponential;            }            if(GUI.Button(new Rect(50,ypos4,200,60),"None"))            {                   isshowDropupButton = true;                isshowDropdownButton = false;                RenderSettings.fogMode = 0;//无雾模式                St = "FogMode";            }        }            }}

实现效果如下