Grouping nodes help to organize the scene graph, can establish relative coordinate systems, and can contain most other kinds of X3D nodes.

Grouping nodes include the Anchor, Billboard, Collision, Group, StaticGroup, Switch and Transform nodes. The Inline node is also similar since it adds nodes into the current scene that loaded from another X3D scene, retrieved via a local or online url address.

The supporting Chapter 3 slideset and course videos (NPS, YouTube) for X3D for Web Authors are available online via X3dGraphics.com.

Also available: X3D Scene Authoring Hints for Coordinate Systems, Inline Scenes, Scale Factors and URL Links.