Unity Shader:bank BRDF

Back BRDF is an empirical model for simulating anisotropic gloss on metal surfaces, with formulas referring to GPU programming and CG language Spring Snow lowbrow 120-page formula (10-14)

1Shader"CUSTOM/BANK-BRDF" {2 Properties {3_ambicolor ("Main Color", Color) = (1,1,1,1)4_ak ("Ambient Coef",float) =15_diffcolor ("Diff Color", Color) = (1,1,1,1)6_DK ("Diff Coef",float) =17_speccolor ("Spec Color", Color) = (1,1,1,1)8_sk ("Sk",float) =19_SP ("Sp", Range (0,5)) =1Ten     } One  A Subshader { - Pass { - Cgprogram the#include"Unitycg.cginc" -             #pragmaVertex vert -             #pragmaFragment Frag -  + float4 _ambicolor; -             float_ak; + float4 _diffcolor; A             float_DK; at float4 _speccolor; -             float_sk; -             float_sp; -  -             structv2f { - float4 pos:position; in FLOAT3 normal:texcoord0; - FLOAT3 Light:texcoord1; to FLOAT3 View:texcoord2; + FLOAT3 Targent:texcoord3; -             }; the  * v2f Vert (Appdata_base v) { $ v2f o;Panax NotoginsengO.pos =Mul (UNITY_MATRIX_MVP, V.vertex); -O.normal =V.normal; theO.light =Objspacelightdir (V.vertex); +O.view =Objspaceviewdir (V.vertex); AO.targent =Cross (V.normal, o.view); the  +                 returno; -             } $  $ float4 Frag (v2f i): COLOR { -Float3 L =normalize (i.light); -FLOAT3 T =normalize (i.targent); theFLOAT3 v =normalize (I.view); -FLOAT3 n =normalize (i.normal);Wuyi  the                 floatlt =dot (l, t); -                 floatVT =dot (v, t); Wu                 floatNL =dot (n, l); -                 floatNV =dot (n, v); About  $FLOAT4 Ambi = _ambicolor *_ak; -FLOAT4 diff = _dk * _diffcolor *saturate (NL); -  -                 if(NL <=0|| NV <=0) A                     returnAmbi +diff; +  the                 floatp = sqrt (1-LT * lt) * sqrt (1-VT * VT)-LT *VT; -                 floatf = _sk *Pow (P, _sp); $                 floatSpec = f * _speccolor *Saturate (dot (l, N)); the  the                 returnAmbi + diff +spec; the             } the ENDCG -         } in     }  theFallBack"Diffuse" the}

The effect is as follows:

Unity Shader:bank BRDF