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1985-11-03
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89 lines
File Name:
crystal.doc
Title:
crystal -- Copyright (c)1985 Scott D. Thomas, Palo Alto, CA, 85-11-03
For public distribution in its original form.
Purpose:
Project a three dimensional wire frame object to the IBM PC's graphics
screen by using a rotation and projection to two dimensions. User may
rotate the object about each coordinate axis and change the perspective.
A movie that consists of up to 500 three dimensional objects may also be
displayed in sequence together with the rotation mentioned above.
Performance:
An object consisting of 80 line segments can be rendered at least five
times per second, provided an 8087 or 80287 math chip is installed.
Crystal will still work without the math chip, but at a much reduced rate.
Discussion:
This program requires an IBM PC, DOS 2.0+, a Color Graphics Adapter
and 256 K. Optional math chip will be used unless NO87 is defined.
Use the cursor keys, Ins-Del, or j-u, k-i, l-o, ;-p to rotate the object
or change perspective. Esc, q, or x to quit. Space bar stops spinning.
usage:- crystal [flags] [filenames]
flags:-
h=n horizontal scale, default is h=1.0
v=n vertical scale, default is v=1.0
-r auto reverse, movie runs forward and backward
-s initial condition will cause object to spin
The default case is a dodecahedron.
The named files must be vector data files containing one or more frame.
Each frame consists of numbers formatted as follows. First line is number
of line segments to draw, subsequent lines have floating-point x, y, z,
and an integer indicating whether the pen is up or down. The 3D points
(x,y,z) should lie inside a unit sphere. Primitive clipping is performed
with maximum resolution 0 to 319 horizontally by 0 to 199 vertically.
For example, try the cube:
15
0.5 0.5 0.5 1
-.5 0.5 0.5 1
-.5 -.5 0.5 1
0.5 -.5 0.5 1
0.5 0.5 0.5 2
0.5 0.5 -.5 1
-.5 0.5 -.5 1
-.5 -.5 -.5 1
0.5 -.5 -.5 1
0.5 0.5 -.5 0
0.5 -.5 0.5 2
0.5 -.5 -.5 0
-.5 0.5 0.5 2
-.5 0.5 -.5 0
-.5 -.5 0.5 2
-.5 -.5 -.5 0
Further Study:
Stats on crystal.exe:
CRYSTAL EXE 34048 11-03-85 6:11p
Each of the following .DAT files contain one object.
TETRA DAT 384 8-14-85 9:55a - tetrahedron
OCTO DAT 384 7-31-85 4:59p - octohedron
DODECVEC DAT 1408 3-03-85 4:49p - dodecahedron
D2VEC DAT 2560 6-17-85 9:55p - nested dodecahedrons
LINES DAT 1664 8-23-85 1:46p - parallel line segments
CUBE DAT 256 6-22-85 10:15p - cube
The following C program creates a movie with 80 frames.
DUAL EXE 12416 11-03-85 6:39p
DUAL C 5120 11-03-85 6:35p - instructions are here
End of crystal.doc:-)