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Assets/Packages/com.unity.uiextensions/Runtime/Resources/Shaders/UIParticleHidden.shader

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+Shader "UI/Particles/Hidden"
+{
+    Properties
+    {
+    }
+    SubShader
+    {
+        Tags { "Queue"="Geometry" "RenderType"="Opaque" }
+        Cull Off Lighting Off ZWrite Off Fog { Mode Off }
+        LOD 100
+ 
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+ 
+            struct v2f
+            {
+                float4 vertex : SV_POSITION;
+            };
+ 
+            v2f vert ()
+            {
+                v2f o;
+                o.vertex = fixed4(0, 0, 0, 0);
+                return o;
+            }
+           
+            fixed4 frag (v2f i) : SV_Target
+            {
+                discard;
+                return fixed4(0, 0, 0, 0);
+            }
+            ENDCG
+        }
+    }
+}