Building (Real start, Real start_height, Real end_height, Real end);
Building (Box const &b, Real horizon_padding, Axis a, Direction d);
void print () const;
Real height (Real x) const;
Building (Real start, Real start_height, Real end_height, Real end);
Building (Box const &b, Real horizon_padding, Axis a, Direction d);
void print () const;
Real height (Real x) const;