From 8c9ab814299eabe1527e8236b3abcedaf5643fa9 Mon Sep 17 00:00:00 2001
From: josh
+ To create a scalable parser to read scene files according to + a grammar that I supplied, I used the bison parser generator. + I used bison because it is very portable and worked directly + with my C++ code. + The parser produces a hierarchy of Node objects. + Each Node object represents some part of the parse tree + obtained from the scene description file. + Thus, the parse tree can be traversed after parsing is complete + in order to evaluate all of the scene objects specified in the + scene file, maintaining node order and parent/child relationships. +