mobile 2-sided diffuse shader?

does a mobile 2-sided diffuse shader exist anywhere?

 

Code (csharp):

1.  
2. // Simplified Diffuse shader. Differences from regular Diffuse one:
3. // - no Main Color
4. // - fully supports only 1 directional light. Other lights can affect it, but it will be per-vertex/SH.
5.  
6. Shader "Mobile/Diffuse" {
7. Properties {
8.     _MainTex ("Base (RGB)", 2D) = "white" {}
9. }
10. SubShader {
11.     Tags { "RenderType"="Opaque" }
12.     LOD 150
13.     Cull off
14.  
15. CGPROGRAM
16. #pragma surface surf Lambert noforwardadd
17.  
18. sampler2D _MainTex;
19.  
20. struct Input {
21.     float2 uv_MainTex;
22. };
23.  
24. void surf (Input IN, inout SurfaceOutput o) {
25.     fixed4 c = tex2D(_MainTex, IN.uv_MainTex);
26.     o.Albedo = c.rgb;
27.     o.Alpha = c.a;
28. }
29. ENDCG
30. }
31.  
32. Fallback "Mobile/VertexLit"
33. }
34.  

That should be all you need. The only thing I have added myself is "Cull off", look this up in the shader documentation to see why it works.

 

Daniel does point out a lot of good points in that blog. For simple problems (or certain unique cases), the Cull off solution is usually fine, but as it says in the blog, lighting is an issue (as Cull off will just use the lighting from the opposite side, which is probably going to look wrong in a lot of cases).

If you can add the other side of the geometry yourself in a 3D modelling package, that's probably the best solution most of the time.