初始提交: UE5.3项目基础框架

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

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+// Copyright 2020-2024 CesiumGS, Inc. and Contributors
+
+#pragma once
+
+#include <glm/mat4x4.hpp>
+
+/**
+ * Constants useful for transformation between Cesium and Unreal Engine
+ * coordinate systems.
+ */
+class CesiumTransforms {
+public:
+  /**
+   * The constant to multiply to transform meters to centimeters (100.0).
+   */
+  static const double metersToCentimeters;
+
+  /**
+   * The constant to multiply to transform centimeters to meters (0.01).
+   */
+  static const double centimetersToMeters;
+
+  /**
+   * A matrix to scale Cesium's meters up to Unreal's centimeters.
+   */
+  static const glm::dmat4x4 scaleToUnrealWorld;
+
+  /**
+   * A matrix to scale down Unreal's centimeters into Cesium's meters.
+   */
+  static const glm::dmat4x4 scaleToCesium;
+
+  /**
+   * A matrix to transform Cesium's right-handed, Z-up coordinate system to
+   * Unreal's left-handed, Z-up coordinate system by inverting the Y coordinate.
+   * This same transformation can also go the other way.
+   */
+  static const glm::dmat4x4 unrealToOrFromCesium;
+};