WALKING through walls is no longer a feat peculiar to ghosts. Virtual environments can now use sheets of fog as screens that people can physically jump through to get from one scenario to another, or out of the environment altogether.
Anyone using a virtual reality simulation is usually confined to a small room, with images back-projected onto canvas or plastic walls. But because the walls are so fragile, they are easily damaged if people knock into them, says Ismo Rakkolainen, a computer imaging expert at Tampere University of Technology in Finland.
So he came up with the idea of fog…
