Game Development Reference
In-Depth Information
progress in IT has made it possible to consider using them within a wider and wider
scope of application. Thus, numerous prototypes have been developed during the last
few years. Irrespective of the field of use, the haptic interface must provide a natural
interaction with the environment, which requires adequate transparency so that the
user feels as if he is directly handling the virtual objects without feeling the presence
of the interface. This transparency results in a certain number of design constraints
which have no universal solution. It is thus necessary to compromise. All the interfaces
discussed in this document try to provide a solution to this problem.
The force feedback interfaces with external reaction (mostly fixed) provide a high
quality force feedback. We can obtain a large work space by using a serial struc-
ture. Using a parallel structure reduces the work space, mainly in orientation, but
the dynamic performance is very attractive. The combination of these two types of
solutions provides a great compromise.
These interfaces are particularly adapted to single-user applications.
The force feedback interfaces with internal reaction (mostly portable) provide a
more enhanced force feedback. However, it is difficult to obtain information of the
same quality as on the fixed interfaces (disturbance related to looping of force and
constraints related to the weight of the interface). They also make it possible to move
with the interface and are thus very well adapted to wide range and/or multi-user
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