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Fallback block in ShaderLab reference

Reference for the Fallback block in Shaderlab.
Read time 1 minuteLast updated 22 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.
For more information on migration, refer to Migrating from the Built-In Render Pipeline to the Universal Render Pipeline and Render pipeline feature comparison.
This page contains information on using a 
Fallback
block in your ShaderLab code to assign a fallback Shader object. For information on how a Shader object works, and how Unity chooses when to use a fallback, see Shader objects introduction.

Render pipeline compatibility

Feature name

Universal Render Pipeline (URP)

High Definition Render Pipeline (HDRP)

Custom SRP

Built-in Render Pipeline

ShaderLab: Fallback blockYesYesYesYes

Syntax

To assign a fallback, you place a 
Fallback
block inside a 
Shader
block.

Signature

Function

Fallback "<name>"
If no compatible SubShaders are found, use the named Shader object.
Fallback Off
Do not use a fallback Shader object in place of this one. If no compatible SubShaders are found, display the error shader.

Example

This example code demonstrates the syntax for creating a Shader object that has a named fallback.
Shader "Examples/ExampleFallback"{    SubShader    {        // Code that defines the SubShader goes here.        Pass        {                              // Code that defines the Pass goes here.        }    }    Fallback "ExampleOtherShader"}