How to adapt old surface shader to URP?

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1

I used a vetex color shader(from Probuilder) in my project, when I change to URP, the shader become invalid and turn to pink… Is there anyway to reform the shader to be valid in UPR?

The Shader:

Shader “ProBuilder/Standard Vertex Color” {
Properties {
_Color (“Color”, Color) = (1,1,1,1)
_MainTex (“Albedo (RGB)”, 2D) = “white” {}
_Glossiness (“Smoothness”, Range(0,1)) = 0.5
_Metallic (“Metallic”, Range(0,1)) = 0.0
}
SubShader {
Tags { “RenderType”=“Opaque” }
LOD 200

CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard fullforwardshadows

// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0

sampler2D _MainTex;

struct Input {
float2 uv_MainTex;
float4 vertexColor : COLOR;
};

half _Glossiness;
half _Metallic;
fixed4 _Color;

// Add instancing support for this shader. You need to check ‘Enable Instancing’ on materials that use the shader.
// See Unity - Manual: GPU instancing for more information about instancing.
// #pragma instancing_options assumeuniformscaling
UNITY_INSTANCING_BUFFER_START(Props)
// put more per-instance properties here
UNITY_INSTANCING_BUFFER_END(Props)

void surf (Input IN, inout SurfaceOutputStandard o) {
// Albedo comes from a texture tinted by color
fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color * IN.vertexColor;
o.Albedo = c.rgb;
// Metallic and smoothness come from slider variables
o.Metallic = _Metallic;
o.Smoothness = _Glossiness;
o.Alpha = c.a;
}
ENDCG
}
FallBack “Standard”
}

2

I have no experience with Probuilder so I don’t know what that shader is supposed to do/look like. But this sorta looks quite standard, so have you tried using the ‘Lit’ shader from URP instead?

PS don’t forget to use code tags for code

1 Like
3

Did you manage to convert this Surface Shader to URP? If yes, could you share please?

4

Here’s an example of a Surface Shader for URP: https://github.com/ColinLeung-NiloCat/UnityURP-SurfaceShaderSolution

5

Convert to vertex fragment by Unity create shader code function, then remove the Forward rendering directive in the shader.

This is the base, as wont cover shadows or all URP shader functionality.

After that can also try emulate the URP by looking at a shader graph export, this is more advanced

The above shader is very simple, so can also just remake in the Shader graph

6

Hey, I made an utility to automatically convert Surface Shaders to URP/HDRP shaders : Surface Shader Converter | Utilities Tools | Unity Asset Store
If you have any issues with it, send me an email and I’ll fix it.

7

I converted my surface shader using BetterShaders by Jason Booth