virtual void render(const Msp::GL::Tag &) const;
private:
void build_part(const TrackPart &, const Profile &, const Point &, Msp::GL::MeshBuilder &, unsigned &);
virtual void render(const Msp::GL::Tag &) const;
private:
void build_part(const TrackPart &, const Profile &, const Point &, Msp::GL::MeshBuilder &, unsigned &);