forked from johannesgerer/jburkardt-cpp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathsphere_xyz_display_opengl.html
301 lines (265 loc) · 7.95 KB
/
sphere_xyz_display_opengl.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
<html>
<head>
<title>
SPHERE_XYZ_DISPLAY_OPENGL - Display Unit Sphere and 3D Points Using OpenGL
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
SPHERE_XYZ_DISPLAY_OPENGL<br> Display Unit Sphere and 3D Points Using OpenGL
</h1>
<hr>
<p>
<b>SPHERE_XYZ_DISPLAY_OPENGL</b>
is a C++ program which
reads the name of a data file
containing a list of 3D point coordinates, reads the data,
and displays a unit sphere and the points using <b>OPENGL</b>.
</p>
<p>
It can be difficult to visualize a set of points that lie on the unit
sphere. You can't see the curving surface, and you can see points
that should not be visible, because they are on the other side of
the sphere. By starting the display with a unit sphere, and then
adding the 3D points you want to see, both of these problems are
resolved. The addition of the sphere gives important visual cues
as to how to "read" the data.
</p>
<p>
The program displays the data, and slowly rotates it. Clicking the
mouse stops the rotation; another click starts it again, with rotation
around a different axis.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>sphere_xyz_display_opengl</b> <i>data.txt</i>
</blockquote>
where
<ul>
<li>
<i>data.txt</i> is a file containing a list of the XYZ coordinates
of the points to plot.
</li>
</ul>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>SPHERE_XYZ_DISPLAY_OPENGL</b> is available in
<a href = "../../cpp_src/sphere_xyz_display_opengl/sphere_xyz_display_opengl.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/fern_opengl/fern_opengl.html">
FERN_OPENGL</a>,
a C++ program which
uses OpenGL to display the Barnsley fractal fern.
</p>
<p>
<a href = "../../m_src/sphere_xyz_display/sphere_xyz_display.html">
SPHERE_XYZ_DISPLAY</a>,
a MATLAB program which
reads XYZ information defining points in 3D,
and displays a unit sphere and the points in the MATLAB graphics window.
</p>
<p>
<a href = "../../cpp_src/xy_display_opengl/xy_display_opengl.html">
XY_DISPLAY_OPENGL</a>,
a C++ program which
reads an XY file of 2D point coordinates, and displays
an image of those points using OpenGL.
</p>
<p>
<a href = "../../data/xyz/xyz.html">
XYZ</a>,
a data directory which
contains some examples of 3D pointsets.
</p>
<p>
<a href = "../../cpp_src/xyz_display_opengl/xyz_display_opengl.html">
XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZ information defining points in 3D,
and displays an image using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyzf_display_opengl/xyzf_display_opengl.html">
XYZF_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZF information defining points and faces in 3D, and displays
an image using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyzl_display_opengl/xyzl_display_opengl.html">
XYZL_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZL information defining points and lines in 3D, and displays
an image using OpenGL.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Edward Angel,<br>
Interactive Computer Graphics,
a Top-Down Approach with OpenGL,<br>
Addison-Wesley, 2000,<br>
ISBN: 0-201-38597-X,<br>
LC: T385.A514.
</li>
<li>
Renate Kempf, Chris Frazier, editors,<br>
OpenGL Reference Manual,<br>
Fourth Edition,<br>
Addison-Wesley, 2004,<br>
ISBN: 032117383X,<br>
LC: T385.O642
</li>
<li>
Mason Woo, Jackie Neider, Tom Davis,<br>
OpenGL Programming Guide,<br>
Addison-Wesley, 1997,<br>
ISBN: 0-201-46138-2,<br>
LC: T385.N435
</li>
<li>
Richard Wright, Michael Sweet,<br>
OpenGL Superbible,<br>
Third Edition,<br>
Sams, 2004,<br>
ISBN: 0672326019,<br>
LC: T385.W73
</li>
<li>
<a href = "http://www.opengl.org/">
http://www.opengl.org/ </a> <br>
The official OpenGL site.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "sphere_xyz_display_opengl.cpp">
sphere_xyz_display_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "sphere_xyz_display_opengl.sh">sphere_xyz_display_opengl.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "uniform_on_sphere01_triangle.xyz">
uniform_on_sphere01_triangle.xyz</a>, points selected uniformly at
random from a spherical triangle.
</li>
<li>
<a href = "uniform_on_sphere01_triangle.png">uniform_on_sphere01_triangle.png</a>,
a PNG image of the screen generated by Open GL.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for SPHERE_XYZ_DISPLAY_OPENGL.
</li>
<li>
<b>CH_EQI</b> is true if two characters are equal, disregarding case.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>DISPLAY</b> generates the graphics output.
</li>
<li>
<b>MOUSE</b> determines the response to mouse input.
</li>
<li>
<b>MYINIT</b> initializes OpenGL state variables dealing with viewing and attributes.
</li>
<li>
<b>MYRESHAPE</b> determines the window mapping.
</li>
<li>
<b>R8_MAX</b> returns the maximum of two R8's.
</li>
<li>
<b>R8_MIN</b> returns the minimum of two R8's.
</li>
<li>
<b>R83VEC_MAX</b> returns the maximum value in an R83VEC.
</li>
<li>
<b>R83VEC_MIN</b> returns the minimum value in an R83VEC.
</li>
<li>
<b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from a string.
</li>
<li>
<b>S_TO_R8VEC</b> reads an R8VEC from a string.
</li>
<li>
<b>SPIN_IMAGE</b> adjusts the angle of rotation and redisplays the picture.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>XYZ_DATA_PRINT</b> prints the data for an XYZ file.
</li>
<li>
<b>XYZ_DATA_READ</b> reads the data in an XYZ file.
</li>
<li>
<b>XYZ_HEADER_PRINT</b> prints the header of an XYZ file.
</li>
<li>
<b>XYZ_HEADER_READ</b> reads the header of an XYZ file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 28 August 2010.
</i>
<!-- John Burkardt -->
</body>
<!-- Initial HTML skeleton created by HTMLINDEX. -->
</html>