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Assets/Plugins/Trails FX/Resources/TrailsFX/TrailMask.shader

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+Shader "TrailsFX/Mask" {
+Properties {
+    _MainTex ("Texture", 2D) = "white" {}
+    _Color ("Color", Color) = (1,1,1) // not used; dummy property to avoid inspector warning "material has no _Color property"
+    _CutOff("Cut Off", Float) = 0.5
+    _Cull ("Cull", Int) = 2
+}
+    SubShader
+    {
+        Tags { "Queue"="Transparent+100" "RenderType"="Transparent" }
+
+        // Create mask
+        Pass
+        {
+			Stencil {
+                Ref 2
+                WriteMask 2
+                Comp always
+                Pass replace
+            }
+            ColorMask 0
+            ZTest Always
+            ZWrite Off
+            Cull [_Cull]
+
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv     : TEXCOORD0;
+				UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct v2f
+            {
+				float4 pos: SV_POSITION;
+                float2 uv     : TEXCOORD0;
+				UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+      		sampler2D _MainTex;
+      		fixed _CutOff;
+
+            v2f vert (appdata v)
+            {
+				v2f o;
+				UNITY_SETUP_INSTANCE_ID(v);
+				UNITY_INITIALIZE_OUTPUT(v2f, o);
+				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+				o.pos = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+				return o;
+            }
+            
+            fixed4 frag (v2f i) : SV_Target
+            {
+            	fixed4 col = tex2D(_MainTex, i.uv);
+            	#if TRAIL_ALPHACLIP
+            	    clip(col.a - _CutOff);
+            	#endif
+            	return 0;
+            }
+            ENDCG
+        }
+
+    }
+}