Creating a hangar roof

[AndresKasekamp]

How to create a hangar-type roof for buildings in CityEngine?

It is not built-in to primitive roof types, so do I have to start with rotating and splitting a cylinder?

[CherylLau]

Here is some code that does what you suggested (rotate and split a cylinder).  It assumes the building footprint is rectangular.

@Order(1)
@Range(min=0, max=20)
attr eave_height = 10

@Order(2)
@Range(min=0, max=20)
attr roof_height = 5

@Order(3)
@Range(min=3, max=32, stepsize=1)
attr num_hangar_divisions = 8

Lot -->
	extrude(eave_height) Mass.
	comp(f) { top: HangarRoof }
	
HangarRoof -->
	alignScopeToGeometry(zUp, any, longest)
	rotateScope(0, 0, 90)
	primitiveCylinder(2*num_hangar_divisions)
	s('1, '1, 2*roof_height)
	t(0, 0, '-0.5)
	split(z) { ~1: NIL | ~1: HangarRoof. }