r3dux.org

The above video is doctored a little to improve contrast and things – so it’s essentially fake, but you can see live video of the process here and here – which definitely isn’t, and is still rather impressive.

I guess they take a depth map of the building with lasers and then compensate for the angles and depth of the building geometry much like logos on sports pitches appear to be a flat and correct 2D images from the perspective of the main TV camera, but are all distorted when you look at them from another angle. They must create clipping masks for the windows and any other special features, too.

Clever stuff.