
Interaction techniques for virtual behavioural primitives 277
Figure 12.23 CAT (Control Action Table) © Iparla project, LaBRI-INRIA
12.5.3.1 Virtual object positioning
Positioning a virtual object amounts to a group of translations. These translations
can give priority to speed or accuracy. The possibilities offered for virtual reality in
terms of manipulation are not necessarily those that can be imagined. One of the most
significant examples continues to be positioning an object in space. The user faces more
difficulties in accurately positioning an object when he can freely move in a 3D world
than when the movement is restricted on one or several ...