数据类型：枚举与结构体

public enum PlatformType { PC, Mac, Android, iOS, Pico, Quest, AVP, PicoSwan, OpenXR, PCVR }

public enum ActiveRenderMode { MultiRender, SingleRender }

public enum SourceType { LCC, PLY, SPLAT, TYY, None, SOG, SPZ, KSPLAT }

public enum DataType { L1, L2, L2Pro, K1, K2, Drone, Drone_L2, PortalCam, None }

public enum MipMode { Mip, Non_Mip }

public enum SnapType { None, Edge, Corner }

public enum SelectionMode { Auto, Normal, Large }

public enum RenderMode { PointCloud, LCCGS }

public enum SelectMode { normal, invert, clip }

public enum OperationMode { normal = 0, erase = 1 }

public enum EditType { Edit2D, Edit3D }

public enum ShapeType { box, sphere }

public struct HitResult {
    public bool isHit;             // 是否命中
    public float distance;         // 距离
    public Vector3 hitPos;         // 命中点世界坐标
    public Vector3 normal;         // 命中法线
    public float hitAlpha;         // 被击中椭球的 Alpha
    public float dist2Origin;      // 到射线源的距离
    public float scale;            // 椭球 scale
    public SnapType snapType;      // 吸附类型（None / Edge / Corner）
    public Vector3 originalHitPos; // 吸附前原始命中点
}

public struct SnapPreviewState {
    public bool hasTarget;          // 是否有吸附目标
    public SnapType snapType;       // None / Edge / Corner
    public Vector2 screenPos;       // 吸附目标屏幕坐标
    public float distanceToMouse;   // 到鼠标位置的像素距离
}

public struct Data2D {
    public Texture2D texture;  // R8 1024x1024 蒙版纹理
    public Matrix4x4 mv;       // ModelView 矩阵
    public Matrix4x4 mvp;      // ModelViewProjection 矩阵
    public SelectMode mode;    // normal / invert
}

public struct Data3D {
    public ShapeType type;          // box / sphere
    public Matrix4x4 invMat;        // 几何体逆变换矩阵
    public OperationMode operation; // normal=并集, erase=差集
    public SelectMode mode;         // normal / invert / clip
}

public struct DataMix {
    public EditType editType;       // Edit2D / Edit3D
    public ShapeType type;          // 3D 几何体类型
    public Matrix4x4 invMat;        // 3D 逆变换矩阵
    public Texture2D texture;       // 2D 蒙版纹理
    public Matrix4x4 mv;            // 2D ModelView
    public Matrix4x4 mvp;           // 2D MVP
    public OperationMode operation;
    public SelectMode mode;
}

public struct ToneMix {
    public EditType editType;       // Edit2D / Edit3D
    public ShapeType type;          // 3D 几何体类型
    public Matrix4x4 invMat;        // 3D 逆变换矩阵
    public Texture2D texture;       // 2D 蒙版纹理
    public Matrix4x4 mv;            // 2D ModelView
    public Matrix4x4 mvp;           // 2D MVP
    public OperationMode operation;
    public SelectMode mode;
    public float brightness;        // 亮度（默认 1.0）
    public float saturation;        // 饱和度（默认 1.0）
    public float contrast;          // 对比度（默认 1.0）
    public int lutid;               // LUT 滤镜索引（0=不使用）
}

public struct PointLightData {
    public float3 position;    // 世界坐标
    public int lightType;      // 0=点光源, 1=聚光灯
    public float3 color;       // rgb 颜色（无 alpha 分量）
    public float intensity;    // 光照强度
    public float3 direction;   // 聚光灯朝向（点光源忽略）
    public float range;        // 光照范围
    public float spotAngle;    // 聚光灯锥角（度，点光源忽略）
    public float3 pad;         // 对齐填充，无需赋值
}

public struct DecalOcclusionSettings {
    public float opacityCutoff;   // [0,1] splat 参与深度图的最低 opacity，默认 0（全部参与）
    public float depthBias;       // 相对深度容差比例，默认 0.05
    public int   footprintMaxPx;  // 方形足迹半径上限(px)，0~16，默认 2
    public int   resolution;      // 深度图分辨率(px，2 的幂，256~4096)，默认 1024

    public static DecalOcclusionSettings Default { get; } // cutoff=0, bias=0.05, footprint=2, resolution=1024
}

public struct LCCMeshBlockInfo {
    public string id;           // 节点 id，与 LCCMeshBlock.id 对应
    public Bounds boundsWorld;  // 世界空间 AABB，用于挑选 id
    public Bounds boundsLocal;  // 本地空间 AABB
    public int vertexCount;     // 顶点数
    public int faceCount;       // 面数
}

public struct LCCMeshBlock {
    public string id;           // 节点 id
    public Vector3[] vertices;  // 顶点，本地坐标系
    public int[] triangles;     // 三角形索引，每 3 个一组
    public Bounds boundsLocal;  // 与 vertices 同空间的包围盒
}