Force-reload tilesets when changing ellipsoid

Source/CesiumRuntime/Private/CesiumGeoreference.cpp

@@ -2,6 +2,7 @@
 
 #include "CesiumGeoreference.h"
 #include "Camera/PlayerCameraManager.h"
+#include "Cesium3DTileset.h"
 #include "CesiumActors.h"
 #include "CesiumCommon.h"
 #include "CesiumCustomVersion.h"
@@ -18,6 +19,7 @@
 #include "EngineUtils.h"
 #include "GameFramework/PlayerController.h"
 #include "GeoTransforms.h"
+#include "Kismet/GameplayStatics.h"
 #include "LevelInstance/LevelInstanceActor.h"
 #include "Math/Matrix.h"
 #include "Math/RotationTranslationMatrix.h"
@@ -252,6 +254,11 @@ void ACesiumGeoreference::SetSubLevelCamera(APlayerCameraManager* NewValue) {
   this->SubLevelCamera_DEPRECATED = NewValue;
 }
 
+void ACesiumGeoreference::SetEllipsoid(UCesiumEllipsoid* NewEllipsoid) {
+  this->Ellipsoid = NewEllipsoid;
+  this->ForceReloadTilesets();
+}
+
 #if WITH_EDITOR
 bool ACesiumGeoreference::GetShowLoadRadii() const {
   return this->ShowLoadRadii;
@@ -680,6 +687,7 @@ void ACesiumGeoreference::PostEditChangeProperty(FPropertyChangedEvent& event) {
   CESIUM_POST_EDIT_CHANGE(propertyName, ACesiumGeoreference, OriginLatitude);
   CESIUM_POST_EDIT_CHANGE(propertyName, ACesiumGeoreference, OriginHeight);
   CESIUM_POST_EDIT_CHANGE(propertyName, ACesiumGeoreference, Scale);
+  CESIUM_POST_EDIT_CHANGE(propertyName, ACesiumGeoreference, Ellipsoid);
 }
 
 namespace {
@@ -880,6 +888,39 @@ void ACesiumGeoreference::UpdateGeoreference() {
   OnGeoreferenceUpdated.Broadcast();
 }
 
+void ACesiumGeoreference::ForceReloadTilesets() {
+  const UWorld* World = GetWorld();
+  if (!IsValid(World)) {
+    UE_LOG(
+        LogCesium,
+        Warning,
+        TEXT(
+            "Couldn't reload tileset because GetWorld() returned invalid ptr"));
+    return;
+  }
+
+  // Find all tilesets
+  TArray<AActor*> TilesetActors;
+  UGameplayStatics::GetAllActorsOfClass(
+      World,
+      ACesium3DTileset::StaticClass(),
+      TilesetActors);
+
+  for (AActor* Actor : TilesetActors) {
+    ACesium3DTileset* Tileset = Cast<ACesium3DTileset>(Actor);
+    if (!IsValid(Tileset)) {
+      continue;
+    }
+
+    // We don't need to resolve the georeference if the property isn't already
+    // set, since LoadTileset won't run without one, and if the tileset hasn't
+    // run LoadTileset yet we don't need to reload it
+    if (Tileset->GetGeoreference() == this) {
+      Tileset->RefreshTileset();
+    }
+  }
+}
+
 GeoTransforms ACesiumGeoreference::GetGeoTransforms() const noexcept {
   // Because GeoTransforms is deprecated, we only lazily update it.
   return GeoTransforms(

Source/CesiumRuntime/Public/CesiumGeoreference.h

@@ -85,16 +85,6 @@ class CESIUMRUNTIME_API ACesiumGeoreference : public AActor {
   UPROPERTY(BlueprintAssignable, Category = "Cesium")
   FGeoreferenceUpdated OnGeoreferenceUpdated;
 
-  /**
-   * Returns a pointer to the UCesiumEllipsoid currently being used by this
-   * georeference.
-   *
-   * If no ellipsoid has been created yet, this method will attempt to create
-   * one based on the value of {@link EllipsoidPath}.
-   */
-  UFUNCTION(BlueprintCallable, Category = "Cesium")
-  UCesiumEllipsoid* GetEllipsoid() const;
-
 #pragma region Properties
 
 private:
@@ -107,6 +97,8 @@ class CESIUMRUNTIME_API ACesiumGeoreference : public AActor {
       Category = "Cesium",
       EditAnywhere,
       BlueprintReadWrite,
+      BlueprintGetter = GetEllipsoid,
+      BlueprintSetter = SetEllipsoid,
       meta = (AllowPrivateAccess))
   UCesiumEllipsoid* Ellipsoid = nullptr;
 
@@ -404,6 +396,22 @@ class CESIUMRUNTIME_API ACesiumGeoreference : public AActor {
     return this->SubLevelSwitcher;
   }
 
+  /**
+   * Returns a pointer to the UCesiumEllipsoid currently being used by this
+   * georeference.
+   */
+  UFUNCTION(BlueprintCallable, BlueprintGetter, Category = "Cesium")
+  UCesiumEllipsoid* GetEllipsoid() const;
+
+  /**
+   * Sets the UCesiumEllipsoid used by this georeference.
+   *
+   * Calling this will cause all tilesets under this georeference to be
+   * reloaded.
+   */
+  UFUNCTION(BlueprintSetter, Category = "Cesium")
+  void SetEllipsoid(UCesiumEllipsoid* NewEllipsoid);
+
 #if WITH_EDITOR
   /**
    * Gets whether to visualize the level loading radii in the editor. Helpful
@@ -820,6 +828,11 @@ class CESIUMRUNTIME_API ACesiumGeoreference : public AActor {
    */
   void UpdateGeoreference();
 
+  /**
+   * Forces all the tilesets under this georeference to be completely reloaded.
+   */
+  void ForceReloadTilesets();
+
   /**
    * A tag that is assigned to Georeferences when they are created
    * as the "default" Georeference for a certain world.