How to create such roof structures ?

Question

I have to create ( circle in red ) such roof structures over my extruded building footprints ( by using CGA code ). When i select polygonal shape creation tool to create such one, it forms the polygonal shape at ground level. How can i create such ones as attached here to get a realistic appearence ?

DevinLavigne · Accepted Answer

Create a copy of your geometry and pass that onto another rule...

Footprint--> extrude(120) comp(f) {top: Roof1 Roof2 | side: Wall}

Roof1--> something ...

Roof2--> something else....like making it smaller, extruding for a parapet, etc..