Texturing Troubles in Unity Surface Shader

It sounds like you’re dealing with a common issue when it comes to handling multiple texture slots in Unity shaders. You’re right that you should be able to control the tiling and offset for both your albedo (_MainTex) and normal (_NormalTex) textures.

The key thing here is that you need to use different UVs for each texture. It seems like you’re only using the UVs for _MainTex (IN.uv_MainTex) for both textures, which is why _NormalTex isn’t reacting to the tiling and offset settings you input.

Here’s a rough idea of what you can do:

1. Define a new set of UV inputs for your normal texture in your shader’s input structure. For instance, you could add float2 uv_NormalTex;.
2. Then, when you’re doing the calculations in the shader, make sure to sample _NormalTex using this new UV set. You would write something like:

        fixed4 normalSample = tex2D(_NormalTex, IN.uv_NormalTex);
        

3. When you set the material properties in the Unity editor, you should be able to control Tiling and Offset for both the albedo and normal textures separately.

Here’s a tiny code snippet to illustrate:

    struct Input {
        float2 uv_MainTex;
        float2 uv_NormalTex; // New UV for normal texture
    };
    
    void surf(Input IN, inout SurfaceOutputStandard o) {
        fixed4 albedo = tex2D(_MainTex, IN.uv_MainTex);
        fixed4 normal = tex2D(_NormalTex, IN.uv_NormalTex);
        // do something with albedo and normal
    }
    

Also, don’t forget to define the tiling and offset parameters for your normal texture in the properties section of the shader, like this:

    _NormalTex ("Normal Map", 2D) = "white" {}
    _NormalTex_Tiling ("Normal Map Tiling", Vector) = (1, 1, 0, 0)
    

Then make sure to read the tiling and offset values in your shader code and apply them to the UVs of _NormalTex. This way, you’ll maintain the integrity of your surface shading while having complete control over your textures!

Good luck and happy coding!