SurfaceShader vert function

Unity Engine
1

hello

I want to change texture UV in Vert function of Surface shader
here is Vertex\Fragment code:

I want same thing on Surface shader
how can i use this code on Surface shader code?

My purpose is change UV tiling on vertex shader of surface shader

2

Use a custom vertex function.

See the example for “Custom data computed per-vertex”:

Replace float3 customColor; with float2 customUV; and o.customColor = ... with o.customUV = v.texcoord.xy * _MainTex_ST.xy * 7 + _MainTex_ST.zw;

Alternatively you could just use tex2D(_DetailTex, IN.uv_MainTex * 7) in your surface shader and get basically the same result; exactly the same if you don’t use any texture offset.

1 Like
3

Thank you. I’ll try it

My purpose is create custom UV like Unreal mobile uv tiling solution. Its fast and solve Tiling blocky texture in Mali400 GPUs

I test on simple fragment shader and it worked
https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/CustomizedUVs/

Its unreal mobile test:
download APK:Link

1280Ă—720 270 KB

4

you help me a lot. I spend 7 hours yesterday without result and your help solve my hole problem.
thanks again.

my code:

Shader "Custom/DetailSurface" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _DetailTex ("Base (RGB)", 2D) = "white" {}
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200
       
        CGPROGRAM
        #pragma surface surf Lambert vertex:vert
        #pragma target 3.0
        sampler2D _MainTex;
        sampler2D _DetailTex;  

        struct Input {
            float2 uv_MainTex;
            float2 uv_DetailTex;
float2 customUV;       
           
        };
        void vert (inout appdata_full v, out Input o) {
          UNITY_INITIALIZE_OUTPUT(Input,o);
          o.customUV = v.texcoord.xy * 7;
      }
        void surf (Input IN, inout SurfaceOutput o) {
            half4 c = tex2D (_MainTex, IN.uv_MainTex)*tex2D (_DetailTex, IN.customUV);
            o.Albedo = c.rgb*7;

            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

result on Mali400: