【Unity】リムライティングっぽいシェーダー（StandardShader版）

RimLightingStandard.shader

Shader "Custom/RimLightingStandard" {
	Properties {
		_MainColor ("MainColor", Color) = (1,1,1,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
        	_RimColor("RimColor",Color)=(1,1,1,1)
        	_RimPower("RimPower", Range(0.1, 10.0)) = 3.0
        	_RimAmplitude("RimAmplitude",Float)=1
        	_Alpha("Alpha",Range(0.0,1.0))=1
	}
	SubShader {
		Tags { "RenderType"="Transparent" "Queue"="Transparent" }
		LOD 200
        	Blend SrcAlpha OneMinusSrcAlpha
   
        Pass{
          ZWrite ON
          ColorMask 0
        }

	CGPROGRAM
	#pragma surface surf Standard fullforwardshadows alpha:fade
	#pragma target 3.0

	sampler2D _MainTex;
	fixed4 _MainColor;
        fixed4 _RimColor;
        half _RimPower;
        float _RimAmplitude;
        float _Alpha;
        
        struct Input {
            float2 uv_MainTex;
            float3 worldPos;
            float3 worldNormal;
            float3 viewDir;
        };    
        
	void surf (Input IN, inout SurfaceOutputStandard o) {
        
		fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _MainColor;
            
            	float3 normalDir = normalize(IN.worldNormal);
            	float3 viewDir = normalize(_WorldSpaceCameraPos.xyz-IN.worldPos.xyz);
            	float NVdot = 1 - dot(viewDir,normalDir);
            	float rim=pow(NVdot,_RimPower)*_RimAmplitude;
                 
            	o.Albedo += rim*(1-abs(_Alpha*2-1))*_RimColor.rgb;
            	o.Alpha = _Alpha * (1 + rim);
	}
	ENDCG
	}
	FallBack "Diffuse"
}