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| Shader "KajiyaKayAnisotropic"
{
Properties
{
_ShiftMap("ShiftMap", 2D) = "black" {}
_PrimaryShift("PrimaryShift", float) = 1.0
_SecondaryShift("SecondaryShift", float) = 1.0
_AlbedoMap("AlbedoMap", 2D) = "gray" {}
_SpecMask("SpecMask", 2D) = "white" {}
_SpecularColor1("SpecularColor1", Color) = (1,1,1,1)
_SpecularColor2("SpecularColor2", Color) = (1,1,1,1)
_SpecExp1("SpecExp1", float) = 100.0
_SpecExp2("SpecExp2", float) = 100.0
}
SubShader
{
Pass
{
Tags { "LightMode" = "ForwardBase" }
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_fwdbase
#include "UnityCG.cginc"
#include "AutoLight.cginc"
struct appdata
{
float4 vertex : POSITION;
float2 uv : TEXCOORD0;
float3 normal : NORMAL;
float4 tangent : TANGENT;
};
struct v2f
{
float4 vertex : SV_POSITION;
float2 uv : TEXCOORD0;
float3 normal : TEXCOORD1;
float3 tangent : TEXCOORD2;
float3 binormal : TEXCOORD3;
float3 worldPos : TEXCOORD4;
};
float4 _LightColor0;
sampler2D _ShiftMap;
float4 _ShiftMap_ST;
float _PrimaryShift;
float _SecondaryShift;
sampler2D _AlbedoMap;
float4 _AlbedoMap_ST;
sampler2D _SpecMask;
float4 _SpecMask_ST;
fixed4 _SpecularColor1;
fixed4 _SpecularColor2;
float _SpecExp1;
float _SpecExp2;
float3 ShiftTangent(float3 T, float3 N, float shift)
{
float3 shiftedT = T + (shift * N);
return normalize(shiftedT);
}
float StrandSpecular(float3 T, float3 V, float L, float exponent)
{
float3 H = normalize(L + V);
float dotTH = dot(T, H);
float sinTH = sqrt(1.0 - dotTH*dotTH);
float dirAtten = smoothstep(-1.0, 0.0, dot(T, H));
return dirAtten * pow(sinTH, exponent);
}
v2f vert (appdata v)
{
v2f o;
o.vertex = UnityObjectToClipPos(v.vertex);
o.uv = v.uv;
o.normal = normalize(mul(float4(v.normal, 0.0), unity_WorldToObject).xyz);
o.tangent = normalize(mul(unity_ObjectToWorld, float4(v.tangent.xyz, 0.0)).xyz);
o.binormal = normalize(cross(o.normal,o.tangent)) * v.tangent.w;
o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
return o;
}
fixed4 frag (v2f i) : SV_Target
{
half3 lightDir = normalize(_WorldSpaceLightPos0.xyz);
half3 viewDir = normalize(_WorldSpaceCameraPos.xyz - i.worldPos);
half3 normal = normalize(i.normal);
half3 tangen = normalize(i.tangent);
half3 binormal = normalize(i.binormal);
half3 shiftDir = binormal;
float3 diffuse = saturate(lerp(0.25, 1.0, dot(normal, lightDir)));
float shiftTex = tex2D(_ShiftMap, i.uv) - 0.5;
float3 t1 = ShiftTangent(shiftDir, normal, _PrimaryShift + shiftTex);
float3 specular = _SpecularColor1 * StrandSpecular(t1, viewDir, lightDir, _SpecExp1);
float3 t2 = ShiftTangent(shiftDir, normal, _SecondaryShift + shiftTex);
float specMask = tex2D(_SpecMask, i.uv);
specular += _SpecularColor2 * specMask * StrandSpecular(t2, viewDir, lightDir, _SpecExp2);
fixed4 o;
o.rgb = (diffuse + specular) * tex2D(_AlbedoMap, i.uv) * _LightColor0.xyz;
o.a = 1;
return o;
}
ENDCG
}
}
Fallback "Diffuse"
}
|
