Prevent save stage dialog when reloading Fabric stage

CHANGES.md

@@ -8,6 +8,7 @@
 * Fixed crash when updating tilesets shader inputs.
 * Fixed crash when setting certain `/Cesium` debug options at runtime.
 * Fixed crash when disabling and re-enabling the extension.
+* Fixed a bug where save stage dialog would appear when reloading Fabric stage at startup.
 * Fixed crash when removing USD prims in certain order.
 * Fixed issue where Cesium ion session would not resume on reload.
 * The movie capture tool now waits for tilesets to complete loading before it captures a frame.

exts/cesium.omniverse/cesium/omniverse/usdUtils/usdUtils.py

@@ -154,7 +154,11 @@ def get_path_to_current_ion_server() -> Optional[str]:
 def set_path_to_current_ion_server(path: str) -> None:
     data = get_or_create_cesium_data()
     rel = data.GetSelectedIonServerRel()
-    rel.SetTargets([path])
+
+    # This check helps avoid sending unnecessary USD notifications
+    # See https://github.com/CesiumGS/cesium-omniverse/issues/640
+    if get_path_to_current_ion_server() != path:
+        rel.SetTargets([path])
 
 
 def get_tileset_paths() -> List[str]:

src/core/src/Context.cpp

@@ -134,8 +134,6 @@ void Context::clearStage() {
 }
 
 void Context::reloadStage() {
-    const auto defaultIonServerPath = pxr::SdfPath("/CesiumServers/IonOfficial");
-
     clearStage();
 
     // Populate the asset registry from prims already on the stage