[Rim00](https://vimeo.com/157249989) [Rim01](https://vimeo.com/157250458)

RimEmission.shader

/*-------------------------------------------------

	System Designed,
	Code Written,
	by Kunihiro Sasakawa as [email protected]

-------------------------------------------------*/


Shader "SkyCircus/RimEmission"
{
    Properties
    {
        _RimEmissionColor("_RimEmissionColor", Color) = (0.0,1.0,0.0,1.0)
        _EmissionPower("_EmissionPower",Range(0,5.0) ) = 1

        _InColor("_InSideColor",Color ) = (1.0,0.0,0.0,1.0)
        _InPower("_InPower", Range(0.0,5.0) ) = 1.2

        _OutColor("_OutSideColor",Color ) = (0.0,1.0,0.0,1.0)
        _OutPower("_OutPower", Range(0,5.0) ) = 0.0

        _Strength("_Strength", Range(0.0,5.0) ) = 1.5
        _AlphaFactor("_AlphaFactor",Range(0.0,2.0)) = 0.5
    }
    SubShader
    {
        Tags
        {
            "Queue"="Transparent"
            "IgnoreProjector"="True"
            "RenderType"="Transparent"  
        }
        Cull Back // 裏返し
        ZWrite On
        ZTest LEqual
 
        CGPROGRAM
        //#pragma surface surf BlinnPhongEditor alpha vertex:vert
        #pragma surface surf BlinnPhong alpha
        #pragma target 3.0
        #include "UnityCG.cginc"
        fixed4 _RimEmissionColor;
        fixed _OutPower;
        fixed _InPower;
        fixed _AlphaFactor;
        fixed _EmissionPower;
        fixed _Strength;
        fixed4 _InColor;
        fixed4 _OutColor;
 
        //struct SurfaceOutput
        //{
        //    half3 Albedo;
        //    half3 Normal;
        //    half3 Emission;
        //    half3 Gloss;
        //    half Specular;
        //    half Alpha;
        //    half Custom;
        //};

        struct Input
        {
            float4 screenPos;
            float3 viewDir;
            float2 uv_Texture;
            float3 worldRefl;
            INTERNAL_DATA
        };
        void surf (Input IN, inout SurfaceOutput o)
        {
            o.Albedo = fixed3(0.0,0.0,0.0);
            o.Normal = fixed3(0.0,0.0,1.0);
            o.Gloss = 0.0;
            o.Specular = 0.0;

            fixed3 Fresnel0 = fixed3(0,0,1.0); //角度
            fixed f = 1.0 - dot( normalize( IN.viewDir ), Fresnel0 );
            float4 Fresnel1 = float4( f,f,f,f );
            float4 Step0 = step( Fresnel1,float4( 1.0,1.0,1.0,1.0 ));
            float4 Clamp0 = clamp( Step0, _OutPower.xxxx, float4( 1.0,1.0,1.0,1.0 ));
            float4 Pow0 = pow(Fresnel1,_InPower.xxxx);
            float4 Multiply0 = Pow0 * _Strength.xxxx;
            float4 Multiply1 = Clamp0 * Multiply0;
 
            float progress = 1f - Multiply1.w * _RimEmissionColor.a;
            o.Emission = Multiply1.xyz * _RimEmissionColor.rgb * _EmissionPower.xxx;

            fixed4 color = lerp( _OutColor, _InColor , progress); 
            o.Albedo = color;
            o.Alpha = color.a * _AlphaFactor;
        }
        ENDCG
 
    }
    Fallback "Diffuse"
}