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StencilOutline.shader

Shader "Custom/StencilOutline" {
	Properties
	{
		_OutlineWidth("Outline Width", float) = 0.1
	}
	SubShader
	{
		Tags{ "RenderType" = "Transparent" "Queue" = "Transparent" }

		Pass
		{
			Stencil
			{
				Ref 1
				Comp always
				Pass replace
			}

			Cull Front
			ZWrite Off
			ZTest Off
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM
#pragma vertex vert
#pragma fragment frag

#include "UnityCG.cginc"

			struct appdata
			{
				half4 vertex : POSITION;
				half3 normal : NORMAL;
			};

			struct v2f
			{
				half4 pos : SV_POSITION;
			};

			half _OutlineWidth;

			v2f vert(appdata v)
			{
				v2f o = (v2f)0;

				o.pos = UnityObjectToClipPos(v.vertex +  normalize(v.normal) * _OutlineWidth);

				return o;
			}

			fixed4 frag(v2f i) : SV_Target
			{
				return 0;
			}
			ENDCG
		}


		Pass
		{
			Stencil
			{
			Ref 2
			Comp always
			Pass replace
			}

			Cull Back
			ZWrite Off
			ZTest Off
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM
#pragma vertex vert
#pragma fragment frag

#include "UnityCG.cginc"

			struct appdata
			{
				half4 vertex : POSITION;
				half3 normal : NORMAL;
			};

			struct v2f
			{
				half4 pos : SV_POSITION;
			};

			v2f vert(appdata v)
			{
				v2f o = (v2f)0;

				o.pos = UnityObjectToClipPos(v.vertex);

				return o;
			}

			fixed4 frag(v2f i) : SV_Target
			{
				return 0;
			}
		ENDCG
		}
	}
}