Fake BRDF Samlple code for Unity3D

Prepare my future: Fake BRDF Samlple code for Unity3d (preparekim.blogspot.com)

1. Shader "Custom/TestShader" {

2. Properties {

3. _MainTex ("Base (RGB)", 2D) = "white" {}

4. _BRDFTex ("BRDF (RGB)", 2D) = ""{}

5. }

6. SubShader {

7. Tags { "RenderType"="Opaque" }

8. LOD 200

10. CGPROGRAM

11. #pragma surface surf NoLighting

12. 
    

13. sampler2D _MainTex;

14. sampler2D _BRDFTex;

15. 
    

16. struct Input {

17. float2 uv_MainTex;

18. float2 uv_BRDFTex;

19. };

20. 
    

21. void surf (Input IN, inout SurfaceOutput o) {

22. half4 c = tex2D (_MainTex, IN.uv_MainTex);

23. o.Albedo = c.rgb;

24. o.Alpha = c.a;

25. }

26. fixed4 LightingNoLighting (SurfaceOutput s, half3 lightDir, half3 viewDir, half atten){

28. half NdotL = dot(s.Normal, lightDir);

30. half NdotV = dot(s.Normal, viewDir);

32. half HalfNdotL = (NdotL*0.5f)+0.5f;

34. half4 c;

36. fixed4 ramp = tex2D (_BRDFTex,float2(NdotV,HalfNdotL));

38. c.rgb = s.Albedo * _LightColor0.rgb * ramp.rgb *( atten *2);

40. c.a = s.Alpha;

42. return c;

43. }

44. ENDCG

45. }

46. FallBack "Diffuse"

47. }