Method of use

A Scene is created at the start of the program, and all Displayable objects should be added to that scene (or to another Displayable as a child). It is used in the primary event loop to prepare and draw all the Displayable's. It is also used to pick items with a pointer. The global routine VMDupdate contains an example of using a Scene object.

There are two derived classes from Scene:

• NormalScene - this is the basic version, which is used for every case except when the CAVE display device is being used. It uses standard memory allocation routines to create storage for display lists, and to store the lists of Displayables and display lists.
• CaveScene - this uses shared memory to store the display lists, so that the CAVE processes can all see the same data for rendering the scene.