I am an architect in the US. I have a company http://www.archadeck.com/   that designs exterior outdoor residential projects (decks and porches). We now use AutoCad to design projects and present to homeowners. The software is powerful but ponderous and slow. I know that some individuals are using gaming and animation software to provide realistic presentations (see http://www.decktools.com/home.html ). I am interested in learning if there are individuals who may know of other software similar to this. Send responses to my email rgrossberg@ussi.net :?