Terminology : BranchGroup
Branch graph
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A scene graph rooted in a BranchGroup node
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Typically one branch for viewing-related nodes (the ViewPlatform,
etc.)
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Typically one branch for 3D content (shapes, sounds, etc.)
A BranchGroup serves as the root of a subgraph, called
a branch graph, of the scene graph. Only BranchGroup objects can attach to Locale
objects.