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        bool inside;  // Is the ray inside an object

        bool inside;  // Is the ray inside an object

        double dist;  // Distance from origin to current intersection

        double dist;  // Distance from origin to current intersection

        float ior;    // Current index of refraction for media

        float ior;    // Current index of refraction for media

        float u, v;   // uv-coordinates on current surface

        float u, v;   // uv-coordinates on current surface

        int trace_depth;  // Current recursion number

        int trace_depth;  // Current recursion number

        size_t hit_face_id;

        size_t hit_face_id;

        int id;

        int id;