初始提交: UE5.3项目基础框架

Plugins/CesiumForUnreal/Source/CesiumRuntime/Private/CesiumMaterialUserData.h

@@ -0,0 +1,29 @@
+// Copyright 2020-2024 CesiumGS, Inc. and Contributors
+
+#pragma once
+
+#include "Engine/AssetUserData.h"
+#include "CesiumMaterialUserData.generated.h"
+
+/**
+ * Instances of this user data class are automatically attached to all materials
+ * that are used by Cesium for Unreal and that have a Layer Stack named
+ * "Cesium". It provides a way for Cesium for Unreal to access the names of the
+ * individual layers in the stack at runtime (i.e. outside the Editor) so that
+ * they can be mapped to raster overlays.
+ *
+ * It works by responding, in the Editor, to changes in the Material to which
+ * it's attached via the `PostEditChangeOwner` and updating its internal mirror
+ * of the layer names. At runtime, these layer names that were configured in the
+ * Editor can't be further changed, so the the mirrored list is still valid.
+ */
+UCLASS()
+class UCesiumMaterialUserData : public UAssetUserData {
+  GENERATED_BODY()
+
+public:
+  virtual void PostEditChangeOwner() override;
+
+  UPROPERTY()
+  TArray<FString> LayerNames;
+};