geometry.hasUVs(...)
attr x = geometry.hasUVs(...)
@StartRule
Lot --> primitiveCube(4, 4, 4)
setupProjection(0, scope.xy, 2, 2)
projectUV(0)
case geometry.hasUVs : color(0.2, 0.8, 0.2)
else : color(0.8, 0.2, 0.2)