Unity Shader(4)——surface shader(三)

接着上篇讲，雾化也是很重要的一种表现效果。（这里根据官方文件整理，后期会补上各种原理）

1、这里的雾化效果是根据物体和屏幕中心相关，离屏幕越近，雾化效果越明显

Shader "Example/Fog via Final Color" { Properties { _MainTex ("Texture", 2D) = "white" {} _FogColor ("Fog Color", Color) = (0.3, 0.4, 0.7, 1.0) } SubShader { Tags { "RenderType" = "Opaque" } CGPROGRAM #pragma surface surf Lambert finalcolor:mycolor vertex:myvert struct Input { float2 uv_MainTex; half fog; }; void myvert (inout appdata_full v, out Input data) { UNITY_INITIALIZE_OUTPUT(Input,data); float4 hpos = UnityObjectToClipPos(v.vertex); hpos.xy/=hpos.w; data.fog = min (1, dot (hpos.xy, hpos.xy)*0.5); } fixed4 _FogColor; void mycolor (Input IN, SurfaceOutput o, inout fixed4 color) { fixed3 fogColor = _FogColor.rgb; #ifdef UNITY_PASS_FORWARDADD fogColor = 0; #endif color.rgb = lerp (color.rgb, fogColor, IN.fog); } sampler2D _MainTex; void surf (Input IN, inout SurfaceOutput o) { o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb; } ENDCG } Fallback "Diffuse" }

2、贴花

这个效果也经常用到，首先通过Tags来控制

Shader "Example/Decal" { Properties { _MainTex ("Base (RGB)", 2D) = "white" {} } SubShader { Tags { "RenderType"="Opaque" "Queue"="Geometry+1" "ForceNoShadowCasting"="True" } LOD 200 Offset -1, -1 CGPROGRAM #pragma surface surf Lambert decal:blend sampler2D _MainTex; struct Input { float2 uv_MainTex; }; void surf (Input IN, inout SurfaceOutput o) { half4 c = tex2D (_MainTex, IN.uv_MainTex); o.Albedo = c.rgb; o.Alpha = c.a; } ENDCG } }