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root/radiance/ray/src/gen/genworm.c
Revision: 2.8
Committed: Sat Aug 21 11:54:06 2004 UTC (19 years, 7 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad4R2P2, rad5R0, rad5R1, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1
Changes since 2.7: +5 -44 lines
Log Message:
Eliminated some redundant library calls

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2 greg 2.8 static const char RCSid[] = "$Id: genworm.c,v 2.7 2003/11/16 10:29:38 schorsch Exp $";
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 schorsch 2.7 #include <stdlib.h>
15 greg 1.1 #include <stdio.h>
16 greg 2.2 #include <math.h>
17 schorsch 2.7 #include <string.h>
18    
19 greg 2.6 #include "calcomp.h"
20 greg 2.8 #include "resolu.h"
21     #include "rterror.h"
22 greg 1.1 #include "fvect.h"
23    
24 greg 1.9 #define XNAME "X`SYS`" /* x function name */
25     #define YNAME "Y`SYS`" /* y function name */
26     #define ZNAME "Z`SYS`" /* z function name */
27     #define RNAME "R`SYS`" /* r function name */
28 greg 1.1
29     #define PI 3.14159265358979323846
30    
31     #define max(a,b) ((a) > (b) ? (a) : (b))
32    
33    
34 schorsch 2.7 /* XXX redundant, move to library */
35 greg 2.6 double l_hermite(char *), l_bezier(char *), l_bspline(char *);
36 greg 1.1
37    
38 schorsch 2.7 int
39 greg 1.1 main(argc, argv)
40     int argc;
41     char *argv[];
42     {
43     char stmp[256];
44 schorsch 2.7 double t, f, lastr = 0, r;
45 greg 1.1 FVECT lastp, p;
46     int i, nseg;
47    
48 greg 1.7 varset("PI", ':', PI);
49 greg 1.8 funset("hermite", 5, ':', l_hermite);
50     funset("bezier", 5, ':', l_bezier);
51     funset("bspline", 5, ':', l_bspline);
52 greg 1.1
53     if (argc < 8)
54     goto userror;
55    
56     for (i = 8; i < argc; i++)
57     if (!strcmp(argv[i], "-e"))
58 greg 1.6 scompile(argv[++i], NULL, 0);
59 greg 1.1 else if (!strcmp(argv[i], "-f"))
60     fcompile(argv[++i]);
61     else
62     goto userror;
63    
64     sprintf(stmp, "%s(t)=%s;", XNAME, argv[3]);
65 greg 1.6 scompile(stmp, NULL, 0);
66 greg 1.1 sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]);
67 greg 1.6 scompile(stmp, NULL, 0);
68 greg 1.1 sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]);
69 greg 1.6 scompile(stmp, NULL, 0);
70 greg 1.1 sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]);
71 greg 1.6 scompile(stmp, NULL, 0);
72 greg 1.1 nseg = atoi(argv[7]);
73     if (nseg <= 0)
74     goto userror;
75    
76 greg 2.8 fputs("# ", stdout);
77     printargs(argc, argv, stdout);
78 greg 1.5 eclock = 0;
79 greg 1.1
80     for (i = 0; i <= nseg; i++) {
81     t = (double)i/nseg;
82     p[0] = funvalue(XNAME, 1, &t);
83     p[1] = funvalue(YNAME, 1, &t);
84     p[2] = funvalue(ZNAME, 1, &t);
85     r = funvalue(RNAME, 1, &t);
86 schorsch 2.5 if (i) {
87 greg 1.1 if (lastr <= r+FTINY && lastr >= r-FTINY) {
88     printf("\n%s cylinder %s.c%d\n",
89     argv[1], argv[2], i);
90     printf("0\n0\n7\n");
91     printf("%18.12g %18.12g %18.12g\n",
92     lastp[0], lastp[1], lastp[2]);
93     printf("%18.12g %18.12g %18.12g\n",
94     p[0], p[1], p[2]);
95     printf("%18.12g\n", r);
96     } else {
97     printf("\n%s cone %s.c%d\n",
98     argv[1], argv[2], i);
99     printf("0\n0\n8\n");
100     f = (lastr - r)/dist2(lastp,p);
101     printf("%18.12g %18.12g %18.12g\n",
102     lastp[0] + f*lastr*(p[0] - lastp[0]),
103     lastp[1] + f*lastr*(p[1] - lastp[1]),
104     lastp[2] + f*lastr*(p[2] - lastp[2]));
105     printf("%18.12g %18.12g %18.12g\n",
106     p[0] + f*r*(p[0] - lastp[0]),
107     p[1] + f*r*(p[1] - lastp[1]),
108     p[2] + f*r*(p[2] - lastp[2]));
109     f = 1.0 - (lastr-r)*f;
110     f = f <= 0.0 ? 0.0 : sqrt(f);
111     printf("%18.12g %18.12g\n", f*lastr, f*r);
112     }
113 schorsch 2.5 }
114 greg 1.1 printf("\n%s sphere %s.s%d\n", argv[1], argv[2], i);
115     printf("0\n0\n4 %18.12g %18.12g %18.12g %18.12g\n",
116     p[0], p[1], p[2], r);
117     VCOPY(lastp, p);
118     lastr = r;
119     }
120 schorsch 2.7 return 0;
121 greg 1.1
122     userror:
123     fprintf(stderr,
124     "Usage: %s material name x(t) y(t) z(t) r(t) nseg [-e expr] [-f file]\n",
125     argv[0]);
126 schorsch 2.7 return 1;
127 greg 1.1 }
128    
129    
130     double
131 greg 2.6 l_hermite(char *nm)
132 greg 1.1 {
133     double t;
134    
135     t = argument(5);
136     return( argument(1)*((2.0*t-3.0)*t*t+1.0) +
137     argument(2)*(-2.0*t+3.0)*t*t +
138     argument(3)*((t-2.0)*t+1.0)*t +
139     argument(4)*(t-1.0)*t*t );
140 greg 1.3 }
141    
142    
143     double
144 greg 2.6 l_bezier(char *nm)
145 greg 1.3 {
146     double t;
147    
148     t = argument(5);
149     return( argument(1) * (1.+t*(-3.+t*(3.-t))) +
150     argument(2) * 3.*t*(1.+t*(-2.+t)) +
151     argument(3) * 3.*t*t*(1.-t) +
152     argument(4) * t*t*t );
153 greg 1.4 }
154    
155    
156     double
157 greg 2.6 l_bspline(char *nm)
158 greg 1.4 {
159     double t;
160    
161     t = argument(5);
162     return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
163     argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
164     argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
165     argument(4) * (1./6.*t*t*t) );
166 greg 1.1 }