Chapter 3. Nodes and Groups

Chapter Objectives. After reading this chapter, you'll be able to do the following:

  • Build scene graphs using shape, property, and group nodes

  • Explain how nodes inherit values in the scene graph

  • Describe why separator nodes are useful

  • Explain the advantages of shared instancing of nodes in the scene graph

  • Define the term path and explain why paths are needed

  • Set and query field values

  • Ignore specified fields in a node

  • Explain how nodes are deleted in Open Inventor

  • Use Inventor's runtime type-checking mechanism

This chapter illustrates how to construct scene graphs from shape, property, and group nodes. It explains general rules for traversing a scene graph, focusing on GL rendering traversal. The concepts of database actions and traversal state are introduced.