Introduction to the QRT Ray Tracer
short:  ??? Something qith QRT=QuickRayTracer
 
 
QRT is a ray tracing image rendering system that runs under a variety of
operating systems. It has a free format input language with extensive error
detection and reporting capabilities.
 
This manual is divided into several sections as follows:
 
QRT Language Reference:
 
 This is a quick reference guide to the QRT command anguage. It can suffice
as a tutorial for those familiar with ray tracing programs, or function as a
guide to QRT features not described in the User Manual.
 
QRT User Manual:
 
 The User Manual is a more complete tutorial to the QRT system. It describes
the basic commands and features of QRT, without listing every possible
command or option. It would be a good starting place for beginners. QRT bugs
and desired enhancements are listed at the end of this section.
 
QRT Error Codes
 
 The error code section explains QRT error messages in detail, and lists
solutions or suggestions where appropriate.
 
Context Free Grammar
 
 This is a BNF style context free grammar description of the QRT input
language. It may be used as a quick reference for people familiar with
compiler terminology.
 
QRT Sample Programs
 
 These are actual QRT input files; they show suggested QRT indenting style
and give examples of various features.
 
References
 
 Howard Anton, Elementary Linear Algebra, Anton Textbooks, Inc., 1987
 
 David F. Rogers, Procedural Elements for Computer Graphics, McGraw Hill,
Inc., 1985
 
 Eric Graham, Graphic Scene Simulations, Amiga World, CW
Communications/Peterborough, Inc., May/June 1987