The Navigation component specifies how a user can effectively and intuitively move through and around a 3D scene.
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Billboard is a Grouping node that can contain most nodes.
Collision detects camera-to-object contact using current view and NavigationInfo avatarSize.
LOD (Level Of Detail) uses camera-to-object distance to switch among contained child levels.
NavigationInfo describes the user's viewing model, user navigation-interaction modalities, and also dimensional characteristics of the user's (typically invisible) avatar.
OrthoViewpoint provides an orthographic perspective-free view of a scene from a specific location and direction.
Viewpoint provides a specific location and direction where the user may view the scene.
ViewpointGroup can contain Viewpoint, OrthoViewpoint, GeoViewpoint and other ViewpointGroup nodes for better user-navigation support with a shared description on the viewpoint list.