3DGeeks found this article from vvvv.org about how to projection map. It is relatively simple, but relatively complex at the same time. If you are a true 3D geek, it should be no problem to make your coffee cup (or even buildings) melt and tumble, but the casual geek may need to take some time with this. Make sure to submit a projection mapping video to us if you pull it off!

See the article here: How To Project On 3D Geometry | vvvv

vvvv.org calls this the "advanced" setup. Pre-made files are available to download, by the way!