convert(...)
attr x = convert(...)
@StartRule
Lot --> primitiveCube(convert(10, "foot", "meter"), 0.2, convert(20, "foot", "meter"))
extrude(3)
comp(f) { top: Roof | side: Wall }
Roof --> color(0.5, 0.25, 0.15)
Wall --> color(0.75, 0.72, 0.68)