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root/radiance/ray/src/gen/genmarble.c
Revision: 2.4
Committed: Mon Aug 2 14:23:03 1993 UTC (31 years, 4 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.3: +4 -0 lines
Log Message:
added conditional declaration of atof()

File Contents

# Content
1 /* Copyright (c) 1986 Regents of the University of California */
2
3 #ifndef lint
4 static char SCCSid[] = "$SunId$ LBL";
5 #endif
6
7 /*
8 * genmarble.c - generate a marble with bubbles inside.
9 *
10 * 1/8/86
11 */
12
13 #include <stdio.h>
14
15 #include <math.h>
16
17 #include "random.h"
18
19 #define PI 3.14159265359
20
21 typedef double FVECT[3];
22
23 double bubble(); /* pretty cute, huh? */
24
25 #ifdef DCL_ATOF
26 extern double atof();
27 #endif
28
29
30 main(argc, argv)
31 int argc;
32 char **argv;
33 {
34 char *cmtype, *cname;
35 FVECT cent;
36 double rad;
37 int nbubbles, i;
38 double bubrad;
39 FVECT v;
40 double brad;
41
42 if (argc != 9) {
43 fprintf(stderr,
44 "Usage: %s material name cent rad #bubbles bubrad\n",
45 argv[0]);
46 exit(1);
47 }
48 cmtype = argv[1];
49 cname = argv[2];
50 cent[0] = atof(argv[3]);
51 cent[1] = atof(argv[4]);
52 cent[2] = atof(argv[5]);
53 rad = atof(argv[6]);
54 nbubbles = atoi(argv[7]);
55 bubrad = atof(argv[8]);
56
57 if (bubrad >= rad) {
58 fprintf(stderr, "%s: bubbles too big for marble\n", argv[0]);
59 exit(1);
60 }
61
62 printf("\n%s sphere %s\n", cmtype, cname);
63 printf("0\n0\n4 %f %f %f %f\n", cent[0], cent[1], cent[2], rad);
64
65 for (i = 0; i < nbubbles; i++) {
66 brad = bubble(v, cent, rad, bubrad);
67 printf("\n%s bubble %s.%d\n", cmtype, cname, i);
68 printf("0\n0\n4 %f %f %f %f\n", v[0], v[1], v[2], brad);
69 }
70
71 return(0);
72 }
73
74
75 double
76 bubble(v, cent, rad, bubrad) /* compute location of random bubble */
77 FVECT v, cent;
78 double rad, bubrad;
79 {
80 double r, ro, theta, phi;
81
82 r = frandom()*bubrad;
83 ro = sqrt(frandom())*(rad-r);
84 theta = frandom()*(2.0*PI);
85 phi = frandom()*PI;
86 sphere_cart(v, ro, theta, phi);
87 v[0] += cent[0]; v[1] += cent[1]; v[2] += cent[2];
88 return(r);
89 }
90
91
92 sphere_cart(v, ro, theta, phi) /* spherical to cartesian coord. conversion */
93 FVECT v;
94 double ro, theta, phi;
95 {
96 double d;
97
98 d = sin(phi);
99 v[0] = ro*d*cos(theta);
100 v[1] = ro*d*sin(theta);
101 v[2] = ro*cos(phi);
102 }