Demo 60 - FurHelper.cginc

#pragma target 3.0
#include "UnityCG.cginc"

struct v2f {
    float4 pos : SV_POSITION;
    half2 uv : TEXCOORD0;
    half2 uv1 : TEXCOORD1;
    fixed4 diff : COLOR;
};

float _FurLength;
sampler2D _MainTex;
float4 _MainTex_ST;
sampler2D _FurTex;
float4 _FurTex_ST;
float _Blur;

v2f vert(appdata_base v) {
    v2f o;
    v.vertex.xyz += v.normal * _FurLength * FURSTEP;
    o.pos = UnityObjectToClipPos(v.vertex);
    o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
    o.uv1 = TRANSFORM_TEX(v.texcoord, _FurTex);
    float3 worldNormal = normalize(mul(v.normal, (float3x3) unity_WorldToObject));
    o.diff = LambertDiffuse(worldNormal);
    o.diff.a = 1 - (FURSTEP * FURSTEP);
    float4 worldPos = mul(unity_WorldToObject, v.vertex);
    o.diff.a += dot(normalize(_WorldSpaceCameraPos.xyz - worldPos), worldNormal) - _Blur;
    return o;
}

float _CutOff;
float _Thickness;

fixed4 frag(v2f i) : SV_Target {
    fixed4 col = tex2D(_MainTex, i.uv);
    fixed alpha = tex2D(_FurTex, i.uv1).r;
    col *= i.diff;
    col.a *= step(lerp(_CutOff, _CutOff + _Thickness, FURSTEP), alpha);
    return col;
}