初始提交: UE5.3项目基础框架

Plugins/CesiumForUnreal/Source/ThirdParty/include/Cesium3DTilesSelection/EllipsoidTilesetLoader.h

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+#pragma once
+
+#include "ITilesetHeightSampler.h"
+
+#include <Cesium3DTilesSelection/Tileset.h>
+#include <CesiumGeometry/QuadtreeTilingScheme.h>
+
+namespace Cesium3DTilesSelection {
+/**
+ * @brief A loader that will generate a tileset by tesselating the surface of an
+ * ellipsoid, producing a simple globe tileset without any terrain features.
+ */
+class EllipsoidTilesetLoader : public TilesetContentLoader,
+                               public ITilesetHeightSampler {
+public:
+  /**
+   * @brief Constructs a new instance.
+   *
+   * @param ellipsoid The {@link CesiumGeospatial::Ellipsoid}.
+   */
+  EllipsoidTilesetLoader(
+      const CesiumGeospatial::Ellipsoid& ellipsoid CESIUM_DEFAULT_ELLIPSOID);
+
+  /**
+   * @brief Creates a new tileset with this loader.
+   *
+   * @param externals The external interfaces to use.
+   * @param options Additional options for the tileset.
+   */
+  static std::unique_ptr<Tileset> createTileset(
+      const TilesetExternals& externals,
+      const TilesetOptions& options = TilesetOptions{});
+
+  CesiumAsync::Future<TileLoadResult>
+  loadTileContent(const TileLoadInput& input) override;
+  TileChildrenResult createTileChildren(
+      const Tile& tile,
+      const CesiumGeospatial::Ellipsoid& ellipsoid
+          CESIUM_DEFAULT_ELLIPSOID) override;
+
+  ITilesetHeightSampler* getHeightSampler() override;
+
+  CesiumAsync::Future<SampleHeightResult> sampleHeights(
+      const CesiumAsync::AsyncSystem& asyncSystem,
+      std::vector<CesiumGeospatial::Cartographic>&& positions) override;
+
+private:
+  struct Geometry {
+    std::vector<uint16_t> indices;
+    std::vector<glm::vec3> vertices;
+    std::vector<glm::vec3> normals;
+  };
+
+  void createChildTile(
+      const Tile& parent,
+      std::vector<Tile>& children,
+      const CesiumGeometry::QuadtreeTileID& childID) const;
+
+  CesiumGeospatial::BoundingRegion
+  createBoundingRegion(const CesiumGeometry::QuadtreeTileID& quadtreeID) const;
+  Geometry createGeometry(const Tile& tile) const;
+  CesiumGltf::Model createModel(const Geometry& geometry) const;
+
+  CesiumGeospatial::GeographicProjection _projection;
+  CesiumGeometry::QuadtreeTilingScheme _tilingScheme;
+};
+} // namespace Cesium3DTilesSelection