A projected hemispherical display with a gestural interface

We have recently built an inexpensive alternative to a volumetric display [Favalora 2005] based on video projector technology that supports omni-directional viewing (Figure 1). It can show mapped spherical surfaces, such as globes, and scenes composed of threedimensional objects. In the latter case, an algorithm was developed to perform hidden surface elimination in the hemisphere’s reference frame.