Added TranslucencySortPriority property to TilesetActor

This property is included as it has a secondary use of controlling the draw order of components in an RVT.

Source/CesiumRuntime/Private/Cesium3DTileset.cpp

@@ -566,6 +566,13 @@ void ACesium3DTileset::SetRuntimeVirtualTextures(
   }
 }
 
+void ACesium3DTileset::SetTranslucencySortPriority(int32 InTranslucencySortPriority) {
+  if (this->TranslucencySortPriority != InTranslucencySortPriority) {
+    this->TranslucencySortPriority = InTranslucencySortPriority;
+    this->DestroyTileset();
+  }
+}
+
 void ACesium3DTileset::PlayMovieSequencer() {
   this->_beforeMoviePreloadAncestors = this->PreloadAncestors;
   this->_beforeMoviePreloadSiblings = this->PreloadSiblings;

Source/CesiumRuntime/Private/CesiumGltfComponent.cpp

@@ -3040,6 +3040,7 @@ static void loadPrimitiveGameThreadPart(
     }
     pMesh->RuntimeVirtualTextures = primData.pTilesetActor->GetRuntimeVirtualTextures();
     pMesh->VirtualTextureRenderPassType = primData.pTilesetActor->GetVirtualTextureRenderPassType();
+    pMesh->TranslucencySortPriority = primData.pTilesetActor->GetTranslucencySortPriority();
 
     pStaticMesh = NewObject<UStaticMesh>(pMesh, componentName);
     pMesh->SetStaticMesh(pStaticMesh);

Source/CesiumRuntime/Public/Cesium3DTileset.h

@@ -972,6 +972,23 @@ class CESIUMRUNTIME_API ACesium3DTileset : public AActor {
   ERuntimeVirtualTextureMainPassType VirtualTextureRenderPassType =
       ERuntimeVirtualTextureMainPassType::Exclusive;
 
+  /**
+   * Translucent objects with a lower sort priority draw behind objects with a higher priority.
+   * Translucent objects with the same priority are rendered from back-to-front based on their bounds origin.
+   * This setting is also used to sort objects being drawn into a runtime virtual texture.
+   *
+   * Ignored if the object is not translucent.  The default priority is zero.
+   * Warning: This should never be set to a non-default value unless you know what you are doing, as it will prevent the renderer from sorting correctly.
+   * It is especially problematic on dynamic gameplay effects.
+   */
+  UPROPERTY(
+    EditAnywhere,
+    BlueprintGetter = GetTranslucencySortPriority,
+    BlueprintSetter = SetTranslucencySortPriority,
+    AdvancedDisplay,
+    Category=Rendering)
+  int32 TranslucencySortPriority;
+
 protected:
   UPROPERTY()
   FString PlatformName;
@@ -1024,36 +1041,20 @@ class CESIUMRUNTIME_API ACesium3DTileset : public AActor {
     return RuntimeVirtualTextures;
   }
 
-  UFUNCTION(BlueprintGetter, Category = "VirtualTexture")
-  uint8 GetVirtualTextureLodBias() const {
-    return VirtualTextureLodBias;
-  }
-
-  UFUNCTION(BlueprintSetter, Category = "VirtualTexture")
-  void SetVirtualTextureLodBias(uint8 InVirtualTextureLodBias);
-
   UFUNCTION(BlueprintSetter, Category = "VirtualTexture")
   void SetRuntimeVirtualTextures(TArray<URuntimeVirtualTexture*> InRuntimeVirtualTextures);
 
-  UFUNCTION(BlueprintGetter, Category = "VirtualTexture")
-  uint8 GetVirtualTextureCullMips() const { return VirtualTextureCullMips; }
-
-  UFUNCTION(BlueprintSetter, Category = "VirtualTexture")
-  void SetVirtualTextureCullMips(uint8 InVirtualTextureCullMips);
-
-  UFUNCTION(BlueprintGetter, Category = "VirtualTexture")
-  uint8 GetVirtualTextureMinCoverage() const {
-    return VirtualTextureMinCoverage;
-  }
-
-  UFUNCTION(BlueprintSetter, Category = "VirtualTexture")
-  void SetVirtualTextureMinCoverage(uint8 InVirtualTextureMinCoverage);
-
   UFUNCTION(BlueprintGetter, Category = "VirtualTexture")
   ERuntimeVirtualTextureMainPassType GetVirtualTextureRenderPassType() const {
     return VirtualTextureRenderPassType;
   }
 
+  UFUNCTION(BlueprintGetter, Category = Rendering)
+  int32 GetTranslucencySortPriority() {return TranslucencySortPriority;}
+
+  UFUNCTION(BlueprintSetter, Category = Rendering)
+  void SetTranslucencySortPriority(int32 InTranslucencySortPriority);
+
   UFUNCTION(BlueprintSetter, Category = "Cesium")
   void SetCesiumIonServer(UCesiumIonServer* Server);