add package files

com.htc.upm.vive.openxr/OpenXRSceneUnderstanding/Samples~/Materials/Shaders/OcclusionShader.shader

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+Shader "Custom/OcclusionShader"
+{
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        Tags { "Queue"="Geometry-1" }
+        ZWrite On
+        ZTest LEqual
+        ColorMask 0
+        
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+
+                UNITY_VERTEX_INPUT_INSTANCE_ID
+            };
+
+            struct v2f
+            {
+                float4 vertex : SV_POSITION;
+
+                UNITY_VERTEX_OUTPUT_STEREO
+            };
+
+            v2f vert(appdata v)
+            {
+                v2f o;
+
+                UNITY_SETUP_INSTANCE_ID(v);
+                UNITY_INITIALIZE_OUTPUT(v2f, o);
+                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+
+                o.vertex=UnityObjectToClipPos(v.vertex);
+                return o;
+            }
+
+            fixed4 frag(v2f i) : SV_Target
+            {
+                return fixed4(0.0, 0.0, 0.0, 0.0);
+            }
+            ENDCG
+        }
+    }
+}

com.htc.upm.vive.openxr/OpenXRSceneUnderstanding/Samples~/Materials/Shaders/OcclusionShader.shader.meta

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+fileFormatVersion: 2
+guid: c5dc16cd88a72994c8efa3274f51585d
+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  preprocessorOverride: 0
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: