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Unity Engine

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Unity Engine

Custom data Surface Shader example in the Built-In Render Pipeline

An example of a Surface Shader that inputs a custom color.
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Using a vertex modifier function, it is also possible to compute custom data in a vertex Shader, which then will be passed to the Surface Shader function per-pixel. The same compilation directive 
vertex:functionName
is used, but the function should take two parameters: 
inout appdata_full
and 
out Input
. You can fill in any Input member that is not a built-in value there.
참고
Custom Input members used in this way must not have names beginning with 'uv' or they won't work properly.
The example below defines a custom 
float3 customColor
member, which is computed in a vertex function:
  Shader "Example/Custom Vertex Data" {    Properties {      _MainTex ("Texture", 2D) = "white" {}    }    SubShader {      Tags { "RenderType" = "Opaque" }      CGPROGRAM      #pragma surface surf Lambert vertex:vert      struct Input {          float2 uv_MainTex;          float3 customColor;      };      void vert (inout appdata_full v, out Input o) {          UNITY_INITIALIZE_OUTPUT(Input,o);          o.customColor = abs(v.normal);      }      sampler2D _MainTex;      void surf (Input IN, inout SurfaceOutput o) {          o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;          o.Albedo *= IN.customColor;      }      ENDCG    }     Fallback "Diffuse"  }
In this example 
customColor
is set to the absolute value of the normal:

Shader example that calculates values in the vertex shader and uses them in the fragment shader.

More practical uses could be computing any per-vertex data that is not provided by built-in Input variables; or optimizing Shader computations. For example, it's possible to compute Rim lighting at the GameObject's vertices, instead of doing that in the Surface Shader per-pixel.