How do you component split a roof with the eave, hip, valley, ridge selectors in CityEngine?

Question

Does anybody know how to use the eave, hip, valley, and ridge selectors when designing roofs in CityEngine. I have not been able to successfully comp (f) a roof with these. Can somebody provide me an example in CGA that works? My goal is to give a hip roof, for example, a little more personality by customizing its edges.

Help -

CherylLau · Answer

The roof edge selectors (eave, hip, valley, ridge) should be used with comp(e) to extract the edges. This code creates a hip roof and creates green edges along the eave edges. edge_width = 0.2 Lot --> roofHip(30) Roof. comp(e) { eave: Edge } Edge --> color(0,1,0) s('1, edge_width, edge_width) center(yz) primitiveCube ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍