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Assets/Trails FX/Resources/TrailsFX/TrailEffectOutline.shader

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+Shader "TrailsFX/Effect/Outline" {
+Properties {
+    _MainTex ("Texture", 2D) = "white" {}
+    _Color ("Color", Color) = (1,1,1,1)
+    _NormalThreshold("Normal Threshold", Float) = 0.1
+    _Cull ("Cull", Int) = 2
+}
+    SubShader
+    {
+        Tags { "Queue"="Transparent+101" "RenderType"="Transparent" }
+
+        Pass
+        {
+			Stencil {
+                Ref 2
+                ReadMask 2
+                Comp NotEqual
+                Pass replace
+            }
+            Blend SrcAlpha OneMinusSrcAlpha
+            ZWrite Off
+            Cull [_Cull]
+
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #pragma multi_compile_instancing assumeuniformscaling nolightprobe nolodfade nolightmap
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float3 norm   : NORMAL;
+				UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct v2f
+            {
+            	UNITY_VERTEX_INPUT_INSTANCE_ID
+                float4 pos    : SV_POSITION;
+                float3 wsNorm : TEXCOORD0;
+				UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+UNITY_INSTANCING_BUFFER_START(Props)
+	UNITY_DEFINE_INSTANCED_PROP(fixed4, _Colors)
+#define _Colors_arr Props
+UNITY_INSTANCING_BUFFER_END(Props)
+
+            v2f vert (appdata v)
+            {
+                v2f o;
+				UNITY_SETUP_INSTANCE_ID(v);
+				UNITY_INITIALIZE_OUTPUT(v2f, o);
+				UNITY_TRANSFER_INSTANCE_ID(v, o);
+				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+                o.pos = UnityObjectToClipPos(v.vertex);
+                o.wsNorm = UnityObjectToWorldNormal(v.norm);
+                return o;
+            }
+
+            float _NormalThreshold;
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+            	UNITY_SETUP_INSTANCE_ID(i);
+              	fixed4 col = UNITY_ACCESS_INSTANCED_PROP(_Colors_arr, _Colors);
+              	fixed dx = saturate(dot(fwidth(i.wsNorm), 1.0.xxx) / _NormalThreshold);
+              	col *= dx;
+				return col;
+            }
+            ENDCG
+        }
+
+    }
+}