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How can I create 3D buildings for sloped rooftops?

I have good experience for creating 3D buildings with flat rooftops (I get z from nDSM from stereo pair). Is there a way for convert flat roofs to skill-ion roofs (as image below) auto using CityEngine or other software?

enter image description here

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Have you tried using a rule simiar to:

Lot -->
    extrude(*height*)
    comp(f) {
        side: Facade.
        top: Roof
Roof -->
    roofShed(*angle*)

This splits the box you have when you do a flat roofed surface into its sides resp. facades and separates out the roof which you want to handle differently. Then you apply the roofShed operation which creates the sloped roof.

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