Decals Surface Shader example in the Built-In Render Pipeline
An example of a Surface Shader that renders a decal to add detail to a material.
Read time 1 minuteLast updated 10 days ago
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.
Decals are commonly used to add details to Materials at run time (for example, bullet impacts). They are especially useful in deferred rendering, because they alter the GBuffer before it is lit, therefore saving on performance.
In a typical scenario, Decals should be rendered after the opaque objects and should not be shadow casters, as seen in the ShaderLab "Tags" in the example below.
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 }}