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1995-03-19
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Introduction to the QRT
Ray Tracer
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
language. 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 Technical Reference:
This is a programmer's guide to the QRT software. It
describes the structures used by QRT and the design
philosophy used in creating the system. It should be read
by anyone attempting to understand or modify the code.
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.
QRT Ray Tracer Page 1 Introduction
Machine Specifics
The QRT post processor is machine dependent. This section
contains instructions on using it, as well as information
on other machine dependent 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
QRT Ray Tracer Page 2 Introduction
Table of Contents
Page
I. QRT Language Reference Manual
A. Introduction .......................... 1
B. Setup Commands ......................... 3
1. Sky ................................. 3
2. Ground .............................. 4
3. Focal Length ........................ 5
4. First Scan .......................... 5
5. Last Scan ........................... 5
6. File Name ........................... 6
7. Observer ............................ 6
8. Lamp ................................ 7
C. Primitive Types ........................ 8
1. Sphere .............................. 8
2. Parallelogram ....................... 9
3. Triangle ............................ 10
4. Ring ................................ 11
5. Quadratic ........................... 12
D. Patterned Surfaces ..................... 14
1. Pattern ............................. 14
2. Rectangle ........................... 16
3. Circle .............................. 17
4. Polygon ............................. 18
E. Bounding Boxes ......................... 19
1. Begin Bbox .......................... 19
2. End Bbox ............................ 19
F. Instances .............................. 20
1. Begin Instances ..................... 20
2. End Instances ....................... 21
3. Instance Of ......................... 22
G. Setting Defaults ....................... 23
1. Default ............................. 23
QRT Ray Tracer Page 3 Introduction
Table of Contents - Cont.
Page
II. QRT Users Manual
A. Introduction .......................... 1
B. Comparison to Other Systems ............ 1
C. The World .............................. 3
D. Input Language ......................... 4
E. Illumination Model ..................... 6
F. Light Sources .......................... 9
G. Observer ............................... 10
H. Filenames .............................. 11
I. Focal Length ........................... 11
J. Sky and Ground ......................... 12
K. Bounding Boxes ......................... 13
L. Patterns ............................... 15
M. Instances .............................. 17
N. Defaults ............................... 19
O. Problems, Bugs ......................... 20
P. Possible Enhancements .................. 21
III. QRT Technical Reference Manual
A. Introduction ........................... 1
B. C Source file list ..................... 1
C. Data Structures ........................ 2
D. Code Description ....................... 4
IV. QRT Error Codes
V. Context Free Grammar
QRT Ray Tracer Page 4 Introduction