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root/radiance/ray/src/gen/genrev.c
Revision: 2.5
Committed: Sun Jun 8 12:03:09 2003 UTC (20 years, 9 months ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 2.4: +92 -88 lines
Log Message:
Reduced compile warnings/errors on Windows.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: genrev.c,v 2.4 2003/02/22 02:07:23 greg Exp $";
3 #endif
4 /*
5 * genrev.c - program to generate functions of rotation about z
6 *
7 * The program takes as input the functions of t for z and r
8 * (the radius). If z is increasing, the normal points
9 * outward, inward for decreasing z. Negative radii are forbidden.
10 *
11 * 8/6/86
12 */
13
14 #include <stdlib.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include <math.h>
18
19 #define ZNAME "Z`SYS`" /* z function name */
20 #define RNAME "R`SYS`" /* r function name */
21
22 #define PI 3.14159265358979323846
23
24 #define FTINY 1e-9
25 /* orientation */
26 #define OUT 01
27 #define IN 02
28 #define UP 04
29 #define DOWN 010
30
31 double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();
32
33 void quit(), eputs(), wputs();
34
35
36 computen(nzp, nrp, z0, r0, z1, r1) /* compute normal */
37 double *nzp, *nrp, z0, r0, z1, r1;
38 {
39 double dr, dz, len;
40
41 dz = r0 - r1; /* right angle vector */
42 dr = z1 - z0;
43 len = sqrt(dr*dr + dz*dz);
44 *nzp = dz/len;
45 *nrp = dr/len;
46 }
47
48
49 void
50 eputs(msg)
51 char *msg;
52 {
53 fputs(msg, stderr);
54 }
55
56
57 void
58 wputs(msg)
59 char *msg;
60 {
61 eputs(msg);
62 }
63
64
65 void
66 quit(code)
67 int code;
68 {
69 exit(code);
70 }
71
72
73 printhead(ac, av) /* print command header */
74 register int ac;
75 register char **av;
76 {
77 putchar('#');
78 while (ac--) {
79 putchar(' ');
80 fputs(*av++, stdout);
81 }
82 putchar('\n');
83 }
84
85
86 double
87 l_hermite()
88 {
89 double t;
90
91 t = argument(5);
92 return( argument(1)*((2.0*t-3.0)*t*t+1.0) +
93 argument(2)*(-2.0*t+3.0)*t*t +
94 argument(3)*((t-2.0)*t+1.0)*t +
95 argument(4)*(t-1.0)*t*t );
96 }
97
98
99 double
100 l_bezier()
101 {
102 double t;
103
104 t = argument(5);
105 return( argument(1) * (1.+t*(-3.+t*(3.-t))) +
106 argument(2) * 3.*t*(1.+t*(-2.+t)) +
107 argument(3) * 3.*t*t*(1.-t) +
108 argument(4) * t*t*t );
109 }
110
111
112 double
113 l_bspline()
114 {
115 double t;
116
117 t = argument(5);
118 return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
119 argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
120 argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
121 argument(4) * (1./6.*t*t*t) );
122 }
123
124
125 main(argc, argv)
126 int argc;
127 char *argv[];
128 {
129 extern long eclock;
130 char stmp[256];
131 char *modname;
132 int smooth = 0;
133 double t, lastz, z, nextz, lastr, r, nextr;
134 double lastnz, lastnr, nz, nr, nextnz, nextnr;
135 int i, nseg;
136 int orient;
137
138 varset("PI", ':', PI);
139 funset("hermite", 5, ':', l_hermite);
140 funset("bezier", 5, ':', l_bezier);
141 funset("bspline", 5, ':', l_bspline);
142
143 if (argc < 6)
144 goto userror;
145
146 for (i = 6; i < argc; i++)
147 if (!strcmp(argv[i], "-e"))
148 scompile(argv[++i], NULL, 0);
149 else if (!strcmp(argv[i], "-f"))
150 fcompile(argv[++i]);
151 else if (!strcmp(argv[i], "-s"))
152 smooth = 1;
153 else
154 goto userror;
155
156 sprintf(stmp, "%s(t)=%s;", ZNAME, argv[3]);
157 scompile(stmp, NULL, 0);
158 sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
159 scompile(stmp, NULL, 0);
160 nseg = atoi(argv[5]);
161 if (nseg <= 0)
162 goto userror;
163 modname = smooth ? "Phong" : argv[1];
164
165 printhead(argc, argv);
166 eclock = 0;
167
168 lastnz = lastnr = 0.0;
169 t = 0.0;
170 lastz = funvalue(ZNAME, 1, &t);
171 lastr = funvalue(RNAME, 1, &t);
172 t = 1.0/nseg;
173 z = funvalue(ZNAME, 1, &t);
174 r = funvalue(RNAME, 1, &t);
175 computen(&nz, &nr, lastz, lastr, z, r);
176 for (i = 1; i <= nseg; i++) {
177 if (i < nseg) {
178 t = (double)(i+1)/nseg;
179 nextz = funvalue(ZNAME, 1, &t);
180 nextr = funvalue(RNAME, 1, &t);
181 computen(&nextnz, &nextnr, z, r, nextz, nextr);
182 } else
183 nextnz = nextnr = 0.0;
184 orient = 0;
185 if (z < lastz-FTINY)
186 orient |= DOWN;
187 else if (z > lastz+FTINY)
188 orient |= UP;
189 if (r < lastr-FTINY)
190 orient |= IN;
191 else if (r > lastr+FTINY)
192 orient |= OUT;
193 if (!orient)
194 goto endfor;
195 if (smooth) {
196 printf("\n%s texfunc Phong\n", argv[1]);
197 printf("4 rev_dx rev_dy rev_dz rev.cal\n");
198 printf("0\n4\n");
199 if (orient&(UP|DOWN)) {
200 t = (nextnz - lastnz)/(z - lastz);
201 printf("\t%15.9g\t%15.9g\n",
202 t, lastnz - t*lastz);
203 } else
204 printf("\t0\t%d\n", orient&IN ? 1 : -1);
205 if (orient&(OUT|IN)) {
206 t = (nextnr - lastnr)/(r - lastr);
207 printf("\t%15.9g\t%15.9g\n",
208 t, lastnr - t*lastr);
209 } else
210 printf("\t0\t%d\n", orient&UP ? 1 : -1);
211 }
212 if (!(orient&(IN|OUT))) {
213 printf("\n%s %s %s.%d\n", modname,
214 orient&DOWN ? "tube" : "cylinder",
215 argv[2], i);
216 printf("0\n0\n7\n");
217 printf("\t0\t0\t%15.9g\n", lastz);
218 printf("\t0\t0\t%15.9g\n", z);
219 printf("\t%15.9g\n", r);
220 } else if (!(orient&(UP|DOWN))) {
221 printf("\n%s ring %s.%d\n", modname, argv[2], i);
222 printf("0\n0\n8\n");
223 printf("\t0\t0\t%15.9g\n", z);
224 printf("\t0\t0\t%15.9g\n", orient&IN ? 1.0 : -1.0);
225 printf("\t%15.9g\t%15.9g\n", lastr, r);
226 } else {
227 printf("\n%s %s %s.%d\n", modname,
228 orient&DOWN ? "cup" : "cone",
229 argv[2], i);
230 printf("0\n0\n8\n");
231 printf("\t0\t0\t%15.9g\n", lastz);
232 printf("\t0\t0\t%15.9g\n", z);
233 printf("\t%15.9g\t%15.9g\n", lastr, r);
234 }
235 endfor:
236 lastz = z; lastr = r;
237 z = nextz; r = nextr;
238 lastnz = nz; lastnr = nr;
239 nz = nextnz; nr = nextnr;
240 }
241 quit(0);
242
243 userror:
244 fprintf(stderr,
245 "Usage: %s material name z(t) r(t) nseg [-e expr] [-f file] [-s]\n",
246 argv[0]);
247 quit(1);
248 }
249
250