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#ifndef lint |
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static const char RCSid[] = "$Id: genmarble.c,v 2.6 2003/06/08 12:03:09 schorsch Exp $"; |
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#endif |
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/* |
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* genmarble.c - generate a marble with bubbles inside. |
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* |
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* 1/8/86 |
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*/ |
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|
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#include <stdio.h> |
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|
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#include <stdlib.h> |
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|
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#include <math.h> |
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|
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#include "random.h" |
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|
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#define PI 3.14159265359 |
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|
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typedef double FVECT[3]; |
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|
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static double bubble(); /* pretty cute, huh? */ |
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static void sphere_cart(); |
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|
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int |
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main(argc, argv) |
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int argc; |
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char **argv; |
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{ |
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char *cmtype, *cname; |
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FVECT cent; |
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double rad; |
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int nbubbles, i; |
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double bubrad; |
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FVECT v; |
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double brad; |
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|
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if (argc != 9) { |
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fprintf(stderr, |
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"Usage: %s material name cent rad #bubbles bubrad\n", |
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argv[0]); |
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exit(1); |
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} |
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cmtype = argv[1]; |
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cname = argv[2]; |
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cent[0] = atof(argv[3]); |
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cent[1] = atof(argv[4]); |
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cent[2] = atof(argv[5]); |
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rad = atof(argv[6]); |
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nbubbles = atoi(argv[7]); |
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bubrad = atof(argv[8]); |
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|
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if (bubrad >= rad) { |
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fprintf(stderr, "%s: bubbles too big for marble\n", argv[0]); |
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exit(1); |
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} |
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|
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printf("\n%s sphere %s\n", cmtype, cname); |
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printf("0\n0\n4 %f %f %f %f\n", cent[0], cent[1], cent[2], rad); |
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|
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for (i = 0; i < nbubbles; i++) { |
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brad = bubble(v, cent, rad, bubrad); |
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printf("\n%s bubble %s.%d\n", cmtype, cname, i); |
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printf("0\n0\n4 %f %f %f %f\n", v[0], v[1], v[2], brad); |
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} |
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|
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return(0); |
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} |
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|
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|
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static double |
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bubble(v, cent, rad, bubrad) /* compute location of random bubble */ |
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FVECT v, cent; |
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double rad, bubrad; |
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{ |
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double r, ro, theta, phi; |
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|
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r = frandom()*bubrad; |
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ro = sqrt(frandom())*(rad-r); |
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theta = frandom()*(2.0*PI); |
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phi = frandom()*PI; |
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sphere_cart(v, ro, theta, phi); |
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v[0] += cent[0]; v[1] += cent[1]; v[2] += cent[2]; |
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return(r); |
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} |
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|
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|
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static void |
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sphere_cart(v, ro, theta, phi) /* spherical to cartesian coord. conversion */ |
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FVECT v; |
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double ro, theta, phi; |
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{ |
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double d; |
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|
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d = sin(phi); |
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v[0] = ro*d*cos(theta); |
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v[1] = ro*d*sin(theta); |
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v[2] = ro*cos(phi); |
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} |
