
16 Virtual Reality: Concepts and Technologies
It has to be noted that only IBM offered a complete, fixed virtual reality set: PC,
software programs and two behavioural interfaces – a head-mounted display and a
lever with location sensor. Not to our surprise, this product failed to appeal to buyers,
and is no longer marketed.
Another problem in creating custom interfaces is the division between the real
and virtual, as the device is “interfacing’’ between these two worlds. For car driving
or airplane flying lessons, the simulator designers did not try creating virtual touch
sensations because of the difficulties mentioned earlier. They preferred associating ...