Vertex modifier Surface Shader example in the Built-In Render Pipeline

It is possible to use a “vertex modifier” function that will modify the incoming vertex data in the vertex ShaderA program that runs on the GPU. More info
See in Glossary. This can be used for things like procedural animation and extrusion along normals. Surface ShaderA streamlined way of writing shaders for the Built-in Render Pipeline. More info
See in Glossary compilation directive vertex:functionName is used for that, with a function that takes inout appdata_full parameter.

Here’s a Shader that moves vertices along their normals by the amount specified in the Material:

  Shader "Example/Normal Extrusion" {
    Properties {
      _MainTex ("Texture", 2D) = "white" {}
      _Amount ("Extrusion Amount", Range(-1,1)) = 0.5
    }
    SubShader {
      Tags { "RenderType" = "Opaque" }
      CGPROGRAM
      #pragma surface surf Lambert vertex:vert
      struct Input {
          float2 uv_MainTex;
      };
      float _Amount;
      void vert (inout appdata_full v) {
          v.vertex.xyz += v.normal * _Amount;
      }
      sampler2D _MainTex;
      void surf (Input IN, inout SurfaceOutput o) {
          o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
      }
      ENDCG
    } 
    Fallback "Diffuse"
  }