
226 Virtual Reality: Concepts and Technologies
Figure 11.6 Hot spot at the centre of the screen due to a bad diffusion of the projected light
projected image. The screens can be flexible or rigid. Flexible screens are easy to carry
and do not block sound waves, which makes it possible to provide sound from outside
in case of a closed space (for example, the six-face visiocube – see further on).
However, setting the correct tension of the flexible screens is difficult because it
involves both, obtaining a surface that is as perfectly flat as possible and restricting
the tension so as not to damage the screen cloth. An incorrect tension and positioning ...