I used to use same car model in one scene in sKetchup. painting it all inside, all except for car paint which I would leave as a default material.. It would allow me to paint the same cars in different colours making it look a bit more various than it was with less resources..
Is it possible to do that with Asset Library cars.. ?
Or could You add some dinamic component atributes to it.. list of colours to pick... Driver in - no Driver.. Car without dark glass window and without driver looks strange on road..
Simillar options for people clouthing.. Winter clouths, summer clouthes.. or make them react to DATA settings from sKetchup.. Same with plants.. I bet You guys have it somewhere on Your agenda..
But car colour and driver is anyway idea seperated from season..