Final color modifier Surface Shader example in the Built-In Render Pipeline

Important: The Built-In Render Pipeline is deprecated and will be made obsolete in a future release.

It remains supported, including bug fixes and maintenance, through the full Unity 6.7 LTS lifecycle.

The Universal Render Pipeline (URP) doesn’t support surface shaders. For more information on how to replace surface shaders in URP, refer to Convert custom shaders for URP compatibility.

It is possible to use a “final color modifier” function that will modify the final color computed by the Shader.The Surface Shader compilation directive finalcolor:functionName is used for this, with a function that takes Input IN, SurfaceOutput o, inout fixed4 color parameters.

Here’s a simple Shader that applies tint to the final color. This is different from just applying tint to the surface Albedo color: this tint will also affect any color that comes from Lightmaps, Light Probes and similar extra sources.

  Shader "Example/Tint Final Color" {
    Properties {
      _MainTex ("Texture", 2D) = "white" {}
      _ColorTint ("Tint", Color) = (1.0, 0.6, 0.6, 1.0)
    }
    SubShader {
      Tags { "RenderType" = "Opaque" }
      CGPROGRAM
      #pragma surface surf Lambert finalcolor:mycolor
      struct Input {
          float2 uv_MainTex;
      };
      fixed4 _ColorTint;
      void mycolor (Input IN, SurfaceOutput o, inout fixed4 color)
      {
          color *= _ColorTint;
      }
      sampler2D _MainTex;
      void surf (Input IN, inout SurfaceOutput o) {
           o.Albedo = tex2D (_MainTex, IN.uv_MainTex).rgb;
      }
      ENDCG
    } 
    Fallback "Diffuse"
  }

Shader example that uses the final color modifier method.

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

Decals Surface Shader example in the Built-In Render Pipeline

Unity Manual

Final color modifier Surface Shader example in the Built-In Render Pipeline