Authors can design scenes to help users navigate to Viewpoints of interest,
and also create user-selectable geometry links using an Anchor (just like HTML).
nodes are the primary means for users to explore a scene.
nodes enable different user-interaction styles (FLY, WALK, EXAMINE etc.) as appropriate.
Only one Viewpoint and one NavigationInfo node can each be active a time,
with order of selection controlled via a binding stack.
Chapter 4 slideset
and course videos
for X3D for Web Authors are available online via
X3D Scene Authoring Hints: Viewpoints and Navigation.