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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

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: genworm.c,v 2.7 2003/11/16 10:29:38 schorsch Exp $";
3 #endif
4 /*
5 * 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 <stdlib.h>
15 #include <stdio.h>
16 #include <math.h>
17 #include <string.h>
18
19 #include "calcomp.h"
20 #include "resolu.h"
21 #include "rterror.h"
22 #include "fvect.h"
23
24 #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
29 #define PI 3.14159265358979323846
30
31 #define max(a,b) ((a) > (b) ? (a) : (b))
32
33
34 /* XXX redundant, move to library */
35 double l_hermite(char *), l_bezier(char *), l_bspline(char *);
36
37
38 int
39 main(argc, argv)
40 int argc;
41 char *argv[];
42 {
43 char stmp[256];
44 double t, f, lastr = 0, r;
45 FVECT lastp, p;
46 int i, nseg;
47
48 varset("PI", ':', PI);
49 funset("hermite", 5, ':', l_hermite);
50 funset("bezier", 5, ':', l_bezier);
51 funset("bspline", 5, ':', l_bspline);
52
53 if (argc < 8)
54 goto userror;
55
56 for (i = 8; i < argc; i++)
57 if (!strcmp(argv[i], "-e"))
58 scompile(argv[++i], NULL, 0);
59 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 scompile(stmp, NULL, 0);
66 sprintf(stmp, "%s(t)=%s;", YNAME, argv[4]);
67 scompile(stmp, NULL, 0);
68 sprintf(stmp, "%s(t)=%s;", ZNAME, argv[5]);
69 scompile(stmp, NULL, 0);
70 sprintf(stmp, "%s(t)=%s;", RNAME, argv[6]);
71 scompile(stmp, NULL, 0);
72 nseg = atoi(argv[7]);
73 if (nseg <= 0)
74 goto userror;
75
76 fputs("# ", stdout);
77 printargs(argc, argv, stdout);
78 eclock = 0;
79
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 if (i) {
87 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 }
114 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 return 0;
121
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 return 1;
127 }
128
129
130 double
131 l_hermite(char *nm)
132 {
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 }
141
142
143 double
144 l_bezier(char *nm)
145 {
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 }
154
155
156 double
157 l_bspline(char *nm)
158 {
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 }