Performer operates on its scene graph via traversals,
where nodes are recursively visited. Traversals occur in the application,
cull, and draw stages, each performing different operations.
Various default operations are performed on the graph automatically;
application-specific operations can be performed by traversal
int draw_callback(pfTraverser *trav,void *travData);
causes draw_callback() to be called in the draw stage when
node is visited. Note - node will not be visited in
the draw stage if it has been culled.
Last modified 21 July 1997.
Dave Pape, firstname.lastname@example.org