Unity3D ShaderLab 车辆喷漆光照模型实战

Shader "91YGame/CarOutLight" {

Properties {

_MainTint("Diffuse Tint",Color)=(1,1,1,1)

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

_SpecularColor("Specular Color",Color)=(1,1,1,1)

_SpecPower("Specular Power",Range(0.1,30))=3

_RelfCube("Reflection Cube",Cube) = ""{}

_BRDFTex("BRDF Texture",2D)=""{}

_DiffusePower("Diffuse Power",Range(0.1,10))=0.5

_FalloffPower("Falloff Spread",Range(0.1,10))=3

_ReflAmount("Reflection Amount",Range(0.1,1))=0.5

_ReflPower("Reflection Power",Range(0.1,3))=2.0

}

SubShader {

Tags { "RenderType"="Opaque" }

LOD 200

 

CGPROGRAM

#pragma surface surf CarPaint

 

sampler2D _MainTex;

sampler2D _BRDFTex;

float4 _MainTint;

float4 _SpecularColor;

fixed _SpecPower;

fixed _DiffusePower;

fixed _FalloffPower;

fixed _ReflAmount;

fixed _ReflPower;

samplerCUBE _RelfCube;

 

struct Input {

float2 uv_MainTex;

float3 worldRefl;

float viewDir;

};

 

inline fixed4 LightingCarPaint(SurfaceOutput s,fixed3 lightDir,half3 viewDir,fixed atten){

half3 h = normalize(lightDir+viewDir);

fixed diff = max(0,dot(s.Normal,lightDir));

 

float ahdn = 1-dot(h,normalize(s.Normal));

ahdn = pow(clamp(ahdn,0,1),_DiffusePower);

half4 brdf = tex2D(_BRDFTex,float2(diff,1-ahdn));

 

float nh = max(0,dot(s.Normal,h));

float spec =pow(nh,s.Specular*_SpecPower)*s.Gloss;

 

fixed4 c;

c.rgb = (s.Albedo*_LightColor0.rbg*brdf.rgb + _LightColor0.rgb*_SpecularColor.rgb*spec)*(atten*2);

c.a = s.Alpha+_LightColor0.a*_SpecularColor.a*spec*atten;

return c;

}

 

void surf (Input IN, inout SurfaceOutput o) {

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

fixed falloff = saturate(1-dot(normalize(IN.viewDir),o.Normal));

falloff = pow(falloff,_FalloffPower);

 

o.Albedo = c.rgb*_MainTint;

o.Emission = pow((texCUBE(_RelfCube,IN.worldRefl).rgb*falloff),_ReflPower)*_ReflAmount;

o.Albedo = c.rgb*_MainTint;

o.Specular = c.r;

o.Gloss =1;

o.Alpha = c.a;

}

ENDCG

} 

FallBack "Diffuse"

}