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Chapter 7: Traversing the Scene Graph
The action-specific responses taken by a node are implemented in the following node
functions:
• draw()—for csDrawAction
• isect()—for csIsectAction
• compile()—for csCompileAction
• sound()—for csSoundAction
When an action operates on one node after another, the action is said to be traversing the
scene graph.
Action Types
In Cosmo 3D, there are four kinds of actions:
• csDrawAction—Renders a scene graph.
• csIsectAction—Selects objects intersecting a ray.
• csCompileAction—Compiles a subgraph.
• csSoundAction—Plays spatialized (3D) sounds in a scene graph.
All of the actions are derived from csAction.
For more information about
• csIsectAction, see “Using csIsectAction” on page 140.
• csCompileAction, see “Compiling Part of a Scene Graph” on page 164.
csAction
csAction is a virtual class from which all actions are derived. An action is an operation
that is performed on some or all of the nodes in a scene graph, for example, a
csDrawAction, when applied to the root node, renders a scene graph.
csAction contains the following method:
virtual void apply(csNode *node) = 0;
