Stencil Outline Effect

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

Shader "Outline"
{
	Properties
	{
		_Color("Color", Color) = (1,0,0,1)
		_Thickness("Thickness", float) = 4
		_NoiseTex("Noise Map", 2D) = "white" {}
		_FadeDist("Fade Distance", Range(0, 500)) = 100
		_MinDist("Minimum Fade In Distace", Range(0,25)) = 10
	}
		SubShader
	{

		Tags{ "Queue" = "Transparent+1" "IgnoreProjector" = "True" "RenderType" = "Transparent" "DisableBatching" = "True" }
		Blend SrcAlpha One
		Cull Back
		ZTest always
		Pass
	{
		Stencil
		{
			Ref 1
			Comp always
			Pass replace
		}

		CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile_fog

#include "UnityCG.cginc"

	struct v2g
	{
		float4  pos : SV_POSITION;
		float2  uv : TEXCOORD0;
		float3 viewTangent : TANGENT;
		float3 normals : NORMAL;
	};

	struct g2f
	{
		float4  pos : SV_POSITION;
		float2  uv : TEXCOORD0;
		float3  viewTangent : TANGENT;
		float3  normals : NORMAL;
	};

	v2g vert(appdata_base v)
	{
		v2g OUT;
		OUT.pos = UnityObjectToClipPos(v.vertex);
	    OUT.uv = v.texcoord;
		OUT.normals = v.normal;
		OUT.viewTangent = ObjSpaceViewDir(v.vertex);

		return OUT;
	}

	half4 frag(g2f IN) : COLOR
	{
		//Render nothing, since this shader is for a secondary material
		return 0;
	}
		ENDCG
	}
		Pass
	{
		Stencil
		{
			Ref 0
			Comp equal
		}
		CGPROGRAM
#include "UnityCG.cginc"
#pragma target 3.0
#pragma vertex vert
#pragma require geometry
#pragma geometry geom
#pragma fragment frag


	half4 _Color;
	float _Thickness;
	sampler2D _NoiseTex;
	float _FadeDist;
	float _MinDist;
	struct v2g
	{
		float4 pos : SV_POSITION;
		float2 uv : TEXCOORD0;
		float3 viewTangent : TANGENT;
		float3 normals : NORMAL;
		float3 viewDist : TEXCOORD1;
	};
	struct g2f
	{
		float4 pos : SV_POSITION;
		float2 uv : TEXCOORD0;
		float3 viewTangent : TANGENT;
		float3 normals : NORMAL;
		float3 viewDist : TEXCOORD1;
	};

	v2g vert(appdata_base v)
	{
		v2g OUT;
		OUT.pos = UnityObjectToClipPos(v.vertex);
		OUT.uv = v.texcoord;
		OUT.normals = v.normal;
		OUT.viewTangent = ObjSpaceViewDir(v.vertex);
		OUT.viewDist = UnityObjectToViewPos(v.vertex).xyz;
		return OUT;
	}

	void displaceGeo(v2g start, v2g end, inout TriangleStream<g2f> triStream)
	{
		float width = _Thickness / 100;
		float4 parallel = end.pos - start.pos;
		normalize(parallel);
		parallel *= width;

		float4 perpendicular = float4(parallel.y, -parallel.x, 0, 0);
		perpendicular = normalize(perpendicular) * width;
		float4 v1 = start.pos - parallel;
		float4 v2 = end.pos + parallel;

		g2f OUT;

		OUT.pos = v1 - perpendicular;
		OUT.uv = start.uv;
		OUT.viewTangent = start.viewTangent;
		OUT.normals = start.normals;
		OUT.viewDist = start.viewDist;
		triStream.Append(OUT);

		OUT.pos = v1 + perpendicular;
		OUT.viewDist = start.viewDist;
		triStream.Append(OUT);

		OUT.pos = v2 - perpendicular;
		OUT.uv = end.uv;
		OUT.viewTangent = end.viewTangent;
		OUT.normals = end.normals;
		OUT.viewDist = start.viewDist;
		triStream.Append(OUT);

		OUT.pos = v2 + perpendicular;
		OUT.uv = end.uv;
		OUT.viewTangent = end.viewTangent;
		OUT.normals = end.normals;
		OUT.viewDist = start.viewDist;
		triStream.Append(OUT);
	}

	[maxvertexcount(4)]
	void geom(triangle v2g IN[3], inout TriangleStream<g2f> triStream)
	{
		displaceGeo(IN[0],IN[1], triStream);
		displaceGeo(IN[1],IN[2], triStream);
		displaceGeo(IN[2],IN[0], triStream);
	}

	half4 frag(g2f IN) : COLOR
	{
		IN.uv.x += _Time;
		IN.uv.y += _Time;
		fixed4 col = tex2D(_NoiseTex, IN.uv) * _Color;
		col.a = saturate((length(IN.viewDist) - _MinDist) / _FadeDist);
		clip(col.a - 0.001);
		return col;
	}
		ENDCG
	}
	}
		FallBack "Diffuse"
}