Pass a TilesetSharedAssetSystem into TilesetExternals.

Cesium3DTilesSelection/include/Cesium3DTilesSelection/TilesetExternals.h

@@ -2,6 +2,7 @@
 
 #include "Library.h"
 #include "TileOcclusionRendererProxy.h"
+#include "TilesetSharedAssetSystem.h"
 #include "spdlog-cesium.h"
 
 #include <CesiumAsync/AsyncSystem.h>
@@ -69,6 +70,13 @@ public:
    */
   std::shared_ptr<TileOcclusionRendererProxyPool> pTileOcclusionProxyPool =
       nullptr;
+
+  /**
+   * @brief The shared asset system used to facilitate sharing of common assets,
+   * such as images, between and within tilesets.
+   */
+  CesiumUtility::IntrusivePointer<TilesetSharedAssetSystem> pSharedAssetSystem =
+      TilesetSharedAssetSystem::getDefault();
 };
 
 } // namespace Cesium3DTilesSelection

Cesium3DTilesSelection/src/TilesetContentManager.cpp

@@ -666,7 +666,7 @@ TilesetContentManager::TilesetContentManager(
       _tileLoadsInProgress{0},
       _loadedTilesCount{0},
       _tilesDataUsed{0},
-      _pSharedAssetSystem(TilesetSharedAssetSystem::getDefault()),
+      _pSharedAssetSystem(externals.pSharedAssetSystem),
       _destructionCompletePromise{externals.asyncSystem.createPromise<void>()},
       _destructionCompleteFuture{
           this->_destructionCompletePromise.getFuture().share()},
@@ -696,7 +696,7 @@ TilesetContentManager::TilesetContentManager(
       _tileLoadsInProgress{0},
       _loadedTilesCount{0},
       _tilesDataUsed{0},
-      _pSharedAssetSystem(TilesetSharedAssetSystem::getDefault()),
+      _pSharedAssetSystem(externals.pSharedAssetSystem),
       _destructionCompletePromise{externals.asyncSystem.createPromise<void>()},
       _destructionCompleteFuture{
           this->_destructionCompletePromise.getFuture().share()},
@@ -848,7 +848,7 @@ TilesetContentManager::TilesetContentManager(
       _tileLoadsInProgress{0},
       _loadedTilesCount{0},
       _tilesDataUsed{0},
-      _pSharedAssetSystem(TilesetSharedAssetSystem::getDefault()),
+      _pSharedAssetSystem(externals.pSharedAssetSystem),
       _destructionCompletePromise{externals.asyncSystem.createPromise<void>()},
       _destructionCompleteFuture{
           this->_destructionCompletePromise.getFuture().share()},

CesiumGltfReader/include/CesiumGltfReader/GltfReader.h

@@ -115,7 +115,7 @@ struct CESIUMGLTFREADER_API GltfReaderOptions {
    * that might appear in this glTF.
    */
   CesiumUtility::IntrusivePointer<GltfSharedAssetSystem> pSharedAssetSystem =
-      nullptr;
+      GltfSharedAssetSystem::getDefault();
 };
 
 /**