Query mesh item count from navigator.

website/o3dv/js/navigator.js

@@ -213,6 +213,11 @@ OV.Navigator = class
         this.Resize ();
     }
 
+    MeshItemCount ()
+    {
+        return this.navigatorItems.MeshItemCount ();
+    }
+
     IsMeshVisible (meshIndex)
     {
         let meshItem = this.navigatorItems.GetMeshItem (meshIndex);

website/o3dv/js/navigatoritems.js

@@ -65,6 +65,11 @@ OV.NavigatorItems = class
         this.meshIndexToItem = {};
     }
 
+    MaterialItemCount ()
+    {
+        return Object.keys (this.materialIndexToItem).length;
+    }
+
     GetMaterialItem (materialIndex)
     {
         return this.materialIndexToItem[materialIndex];
@@ -75,6 +80,11 @@ OV.NavigatorItems = class
         this.materialIndexToItem[materialIndex] = materialItem;
     }
 
+    MeshItemCount ()
+    {
+        return Object.keys (this.meshIndexToItem).length; 
+    }
+
     GetMeshItem (meshIndex)
     {
         return this.meshIndexToItem[meshIndex];

website/o3dv/js/website.js

@@ -190,7 +190,7 @@ OV.Website = class
                     this.navigator.FitMeshToWindow (meshIndex);
                 }
             });
-            if (this.model.MeshCount () > 1) {
+            if (this.navigator.MeshItemCount () > 1) {
                 let isMeshIsolated = this.navigator.IsMeshIsolated (meshIndex);
                 items.push ({
                     name : isMeshIsolated ? 'Remove isolation' : 'Isolate mesh',