今天，学会怎么使用后处理来处理效果了。就像第一视角的迷雾效果，寂静岭那样满世界的白色雾气效果，可以简单的使用后处理的方式来实现一个。效果就如下面：
这里重点是我们如何使用后处理来打到这样的效果。简单点就是我们需要创建一个MonoBehaviour脚本，然后响应OnRenderImage方法
private void OnRenderImage(RenderTexture source, RenderTexture destination)第一个参数是当前屏幕的纹理，就是自动会输入进来的参数，第二个参数是我们需要进过一些列处理只会输出的纹理。后处理的过程就是处理source的过程。其中我们能使用Graphics.Blit函数使用一个材质去处理这个纹理。
Graphics.Blit(source, destination, mat);材质中就是我们自己写的Shader来进行处理了。
private void OnRenderImage(RenderTexture source, RenderTexture destination)
{
if(mat != null)
{
mat.SetColor("_Color", color);
mat.SetFloat("_Depth", depth);
mat.SetFloat("_Mul", mul);
Graphics.Blit(source, destination, mat);
}
else
{
Graphics.Blit(source, destination);
}
}这里生成迷雾的效果是使用了深度纹理，当深度纹理大于一个阈值就会混合一个颜色，深度越大，混合的颜色透明度就越高。下面是简单的Shader:
Shader "Custom/PostFogDepth"
{
Properties
{
_MainTex ("Texture", 2D) = "white" {}
_Color("Color",Color) = (1,1,1,1)
_Depth("Depth",Range(0,1)) = 0.5
_Mul ("Mul",Float) = 1
}
SubShader
{
//Cull Off ZWrite On ZTest Always
Tags { "RenderType" = "Opaque" }
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
};
struct v2f
{
float2 uv : TEXCOORD0;
float4 vertex : SV_POSITION;
};
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
return o;
}
sampler2D _MainTex;
sampler2D _CameraDepthTexture;
fixed _Depth;
fixed4 _Color;
half _Mul;
fixed4 frag(v2f i) : SV_Target
{
fixed4 col = tex2D(_MainTex, i.uv);
//fixed4 col = fixed4(0,0,0,1);
fixed d = Linear01Depth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, i.uv));
fixed f = max(d - _Depth, 0);
if (f > 0)
{
col.rgb = col.rgb*(1 - min(f * _Mul,1)) + _Color.rgb * min(f* _Mul,1);
}
return col;
}
ENDCG
}
}
}
由于摄像机的Far很远，所以深度的变化很细微，所以我这里使用了一个_Mul的参数，目的就是扩大这细微的变化。但是应该有更好的变化曲线，我这里只是简单的学习，简单的倍放已经足够了。
附上完整的CS代码：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PostFog : MonoBehaviour
{
public Material mat;
public Color color;
public float depth;
public float mul;
// Start is called before the first frame update
void Start()
{
GetComponent<Camera>().depthTextureMode = DepthTextureMode.Depth;
}
private void OnRenderImage(RenderTexture source, RenderTexture destination)
{
if(mat != null)
{
mat.SetColor("_Color", color);
mat.SetFloat("_Depth", depth);
mat.SetFloat("_Mul", mul);
Graphics.Blit(source, destination, mat);
}
else
{
Graphics.Blit(source, destination);
}
}
}
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