
356 22. Usability of WebGL Applications
or previous/next buttons that can be used to navigate between the viewpoints that are
dened for a 3D scene.
ree-dimensional viewing applications oen provide a viewpoint menu in order
to allow easy navigation for users so that they can navigate from one point of inter-
est to another simply by selecting a menu item. e viewpoint menu turned out to be
an important navigation tool in one of our recent studies [Jankowski and Decker 12].
Wealso learned that teleportation to 3D viewpoints should be possible through select-
ing a destination in an overview (in our case a minimap). Such viewpoints are usual