初始提交: UE5.3项目基础框架

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

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+// Copyright 2020-2024 CesiumGS, Inc. and Contributors
+
+#pragma once
+
+#include "Math/BoxSphereBounds.h"
+#include "Math/TransformNonVectorized.h"
+#include <Cesium3DTilesSelection/BoundingVolume.h>
+#include <glm/mat3x3.hpp>
+#include <glm/mat4x4.hpp>
+
+struct CalcBoundsOperation {
+  const FTransform& localToWorld;
+  const glm::dmat4& highPrecisionTransform;
+
+  // Bounding volumes are expressed in tileset coordinates, which is usually
+  // ECEF.
+  //
+  // - `localToWorld` goes from model coordinates to Unreal world
+  //    coordinates, where model coordinates include the tile's transform as
+  //    well as any glTF node transforms.
+  // - `highPrecisionTransform` transforms from model coordinates to tileset
+  //    coordinates.
+  //
+  // So to transform a bounding volume, we need to first transform by the
+  // inverse of `highPrecisionTransform` in order bring the bounding volume
+  // into model coordinates, and then transform by `localToWorld` to bring the
+  // bounding volume into Unreal world coordinates.
+
+  glm::dmat4 getModelToUnrealWorldMatrix() const;
+
+  glm::dmat4 getTilesetToUnrealWorldMatrix() const;
+
+  FBoxSphereBounds
+  operator()(const CesiumGeometry::BoundingSphere& sphere) const;
+
+  FBoxSphereBounds
+  operator()(const CesiumGeometry::OrientedBoundingBox& box) const;
+
+  FBoxSphereBounds
+  operator()(const CesiumGeospatial::BoundingRegion& region) const;
+
+  FBoxSphereBounds operator()(
+      const CesiumGeospatial::BoundingRegionWithLooseFittingHeights& region)
+      const;
+
+  FBoxSphereBounds
+  operator()(const CesiumGeospatial::S2CellBoundingVolume& s2) const;
+};