Lately I’m really into these video projections on 3D objects and buildings. I always wondered how they do that, how they match the projected animations with the objects. Last November there was a workshop for the students of a toolkit for real time video synthesis. The students got quite a headstart because they had a scale model of the building and digital 3D models to start with. The position of the spectator is of course quite important to obtain the desired visual effect. If you want to try it out yourself, then you might want to read this guide on the vvvv website: How To Project On 3D Geometry. You can see the results of the workshop here, unfortunately they only used the scale model to show the final animations.