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root/radiance/ray/src/gen/genworm.c
Revision: 2.4
Committed: Sat Feb 22 02:07:23 2003 UTC (21 years, 2 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad3R5
Changes since 2.3: +5 -4 lines
Log Message: 
Changes and check-in for 3.5 release
Includes new source files and modifications not recorded for many years
See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.4 static const char RCSid[] = "$Id$";
3 greg 1.1 #endif
4 greg 1.2 /*
5 greg 1.1 * genworm.c - program to generate worms (strings with varying thickness).
6     *
7     * The program takes as input the functions of t for x, y,
8     * z and r (the radius). Cylinders and cones will be
9     * joined by spheres. Negative radii are forbidden.
10     *
11     * 9/24/87
12     */
13    
14     #include <stdio.h>
15 greg 2.2 #include <math.h>
16 greg 1.1 #include "fvect.h"
17    
18 greg 1.9 #define XNAME "X`SYS`" /* x function name */
19     #define YNAME "Y`SYS`" /* y function name */
20     #define ZNAME "Z`SYS`" /* z function name */
21     #define RNAME "R`SYS`" /* r function name */
22 greg 1.1
23     #define PI 3.14159265358979323846
24    
25     #define max(a,b) ((a) > (b) ? (a) : (b))
26    
27    
28 greg 1.4 double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();
29 greg 2.4 void quit();
30 greg 1.1
31    
32     main(argc, argv)
33     int argc;
34     char *argv[];
35     {
36 greg 1.5 extern long eclock;
37 greg 1.1 char stmp[256];
38     double t, f, lastr, r;
39     FVECT lastp, p;
40     int i, nseg;
41    
42 greg 1.7 varset("PI", ':', PI);
43 greg 1.8 funset("hermite", 5, ':', l_hermite);
44     funset("bezier", 5, ':', l_bezier);
45     funset("bspline", 5, ':', l_bspline);
46 greg 1.1
47     if (argc < 8)
48     goto userror;
49    
50     for (i = 8; i < argc; i++)
51     if (!strcmp(argv[i], "-e"))
52 greg 1.6 scompile(argv[++i], NULL, 0);
53 greg 1.1 else if (!strcmp(argv[i], "-f"))
54     fcompile(argv[++i]);
55     else
56     goto userror;
57    
58     sprintf(stmp, "%s(t)=%s;", XNAME, argv[3]);
59 greg 1.6 scompile(stmp, NULL, 0);
60 greg 1.1 sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]);
61 greg 1.6 scompile(stmp, NULL, 0);
62 greg 1.1 sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]);
63 greg 1.6 scompile(stmp, NULL, 0);
64 greg 1.1 sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]);
65 greg 1.6 scompile(stmp, NULL, 0);
66 greg 1.1 nseg = atoi(argv[7]);
67     if (nseg <= 0)
68     goto userror;
69    
70     printhead(argc, argv);
71 greg 1.5 eclock = 0;
72 greg 1.1
73     for (i = 0; i <= nseg; i++) {
74     t = (double)i/nseg;
75     p[0] = funvalue(XNAME, 1, &t);
76     p[1] = funvalue(YNAME, 1, &t);
77     p[2] = funvalue(ZNAME, 1, &t);
78     r = funvalue(RNAME, 1, &t);
79     if (i)
80     if (lastr <= r+FTINY && lastr >= r-FTINY) {
81     printf("\n%s cylinder %s.c%d\n",
82     argv[1], argv[2], i);
83     printf("0\n0\n7\n");
84     printf("%18.12g %18.12g %18.12g\n",
85     lastp[0], lastp[1], lastp[2]);
86     printf("%18.12g %18.12g %18.12g\n",
87     p[0], p[1], p[2]);
88     printf("%18.12g\n", r);
89     } else {
90     printf("\n%s cone %s.c%d\n",
91     argv[1], argv[2], i);
92     printf("0\n0\n8\n");
93     f = (lastr - r)/dist2(lastp,p);
94     printf("%18.12g %18.12g %18.12g\n",
95     lastp[0] + f*lastr*(p[0] - lastp[0]),
96     lastp[1] + f*lastr*(p[1] - lastp[1]),
97     lastp[2] + f*lastr*(p[2] - lastp[2]));
98     printf("%18.12g %18.12g %18.12g\n",
99     p[0] + f*r*(p[0] - lastp[0]),
100     p[1] + f*r*(p[1] - lastp[1]),
101     p[2] + f*r*(p[2] - lastp[2]));
102     f = 1.0 - (lastr-r)*f;
103     f = f <= 0.0 ? 0.0 : sqrt(f);
104     printf("%18.12g %18.12g\n", f*lastr, f*r);
105     }
106     printf("\n%s sphere %s.s%d\n", argv[1], argv[2], i);
107     printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n",
108     p[0], p[1], p[2], r);
109     VCOPY(lastp, p);
110     lastr = r;
111     }
112     quit(0);
113    
114     userror:
115     fprintf(stderr,
116     "Usage: %s material name x(t) y(t) z(t) r(t) nseg [-e expr] [-f file]\n",
117     argv[0]);
118     quit(1);
119     }
120    
121    
122 greg 2.4 void
123 greg 1.1 eputs(msg)
124     char *msg;
125     {
126     fputs(msg, stderr);
127     }
128    
129    
130 greg 2.4 void
131 greg 1.1 wputs(msg)
132     char *msg;
133     {
134     eputs(msg);
135     }
136    
137    
138 greg 2.4 void
139 greg 1.1 quit(code)
140 greg 2.3 int code;
141 greg 1.1 {
142     exit(code);
143     }
144    
145    
146     printhead(ac, av) /* print command header */
147     register int ac;
148     register char **av;
149     {
150     putchar('#');
151     while (ac--) {
152     putchar(' ');
153     fputs(*av++, stdout);
154     }
155     putchar('\n');
156     }
157    
158    
159     double
160     l_hermite()
161     {
162     double t;
163    
164     t = argument(5);
165     return( argument(1)*((2.0*t-3.0)*t*t+1.0) +
166     argument(2)*(-2.0*t+3.0)*t*t +
167     argument(3)*((t-2.0)*t+1.0)*t +
168     argument(4)*(t-1.0)*t*t );
169 greg 1.3 }
170    
171    
172     double
173     l_bezier()
174     {
175     double t;
176    
177     t = argument(5);
178     return( argument(1) * (1.+t*(-3.+t*(3.-t))) +
179     argument(2) * 3.*t*(1.+t*(-2.+t)) +
180     argument(3) * 3.*t*t*(1.-t) +
181     argument(4) * t*t*t );
182 greg 1.4 }
183    
184    
185     double
186     l_bspline()
187     {
188     double t;
189    
190     t = argument(5);
191     return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
192     argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
193     argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
194     argument(4) * (1./6.*t*t*t) );
195 greg 1.1 }