simply said. its 4curve surface, grid on it, offset, diagonal grid of that offset surface, than calling every fourth point and make a pillar (which you don't see) along this pillar create three rectangles - bottom middle top - connecting corners, and the last is populate panels on the rooftop, that was more complicated - different panels to different location according to some variate parameters.

hi. nice work.
could you give more detailed information about how you build the pillars?

greaaat