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Unity Engine

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Script Reference

Unity Engine

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

Example of a Surface Shader that has a custom vertex function.
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Example of a shader modifying the vertex positions.

It is possible to use a "vertex modifier" function that will modify the incoming vertex data in the vertex Shader. This can be used for things like procedural animation and extrusion along normals. Surface Shader 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"  }