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root/radiance/ray/src/gen/genrev.c
Revision: 1.6
Committed: Fri Jul 20 14:33:10 1990 UTC (33 years, 8 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 1.5: +2 -0 lines
Log Message:
added zero initialization of eclock

File Contents

# Content
1 #ifndef lint
2 static char SCCSid[] = "$SunId$ LBL";
3 #endif
4
5 /* Copyright (c) 1989 Regents of the University of California */
6
7 /*
8 * genrev.c - program to generate functions of rotation about z
9 *
10 * The program takes as input the functions of t for z and r
11 * (the radius). If z is increasing, the normal points
12 * outward, inward for decreasing z. Negative radii are forbidden.
13 *
14 * 8/6/86
15 */
16
17 #include <stdio.h>
18
19 #define ZNAME "Z_" /* z function name */
20 #define RNAME "R_" /* 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
34 main(argc, argv)
35 int argc;
36 char *argv[];
37 {
38 extern long eclock;
39 char stmp[256];
40 char *modname;
41 int smooth = 0;
42 double t, lastz, z, nextz, lastr, r, nextr;
43 double lastnz, lastnr, nz, nr, nextnz, nextnr;
44 int i, nseg;
45 int orient;
46
47 varset("PI", PI);
48 funset("hermite", 5, l_hermite);
49 funset("bezier", 5, l_bezier);
50 funset("bspline", 5, l_bspline);
51
52 if (argc < 6)
53 goto userror;
54
55 for (i = 6; i < argc; i++)
56 if (!strcmp(argv[i], "-e"))
57 scompile(NULL, argv[++i]);
58 else if (!strcmp(argv[i], "-f"))
59 fcompile(argv[++i]);
60 else if (!strcmp(argv[i], "-s"))
61 smooth = 1;
62 else
63 goto userror;
64
65 sprintf(stmp, "%s(t)=%s;", ZNAME, argv[3]);
66 scompile(NULL, stmp);
67 sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
68 scompile(NULL, stmp);
69 nseg = atoi(argv[5]);
70 if (nseg <= 0)
71 goto userror;
72 modname = smooth ? "Phong" : argv[1];
73
74 printhead(argc, argv);
75 eclock = 0;
76
77 lastnz = lastnr = 0.0;
78 t = 0.0;
79 lastz = funvalue(ZNAME, 1, &t);
80 lastr = funvalue(RNAME, 1, &t);
81 t = 1.0/nseg;
82 z = funvalue(ZNAME, 1, &t);
83 r = funvalue(RNAME, 1, &t);
84 computen(&nz, &nr, lastz, lastr, z, r);
85 for (i = 1; i <= nseg; i++) {
86 if (i < nseg) {
87 t = (double)(i+1)/nseg;
88 nextz = funvalue(ZNAME, 1, &t);
89 nextr = funvalue(RNAME, 1, &t);
90 computen(&nextnz, &nextnr, z, r, nextz, nextr);
91 } else
92 nextnz = nextnr = 0.0;
93 orient = 0;
94 if (z < lastz-FTINY)
95 orient |= DOWN;
96 else if (z > lastz+FTINY)
97 orient |= UP;
98 if (r < lastr-FTINY)
99 orient |= IN;
100 else if (r > lastr+FTINY)
101 orient |= OUT;
102 if (!orient)
103 goto endfor;
104 if (smooth) {
105 printf("\n%s texfunc Phong\n", argv[1]);
106 printf("4 rev_dx rev_dy rev_dz rev.cal\n");
107 printf("0\n4\n");
108 if (orient&(UP|DOWN)) {
109 t = (nextnz - lastnz)/(z - lastz);
110 printf("\t%15.9g\t%15.9g\n",
111 t, lastnz - t*lastz);
112 } else
113 printf("\t0\t%d\n", orient&IN ? 1 : -1);
114 if (orient&(OUT|IN)) {
115 t = (nextnr - lastnr)/(r - lastr);
116 printf("\t%15.9g\t%15.9g\n",
117 t, lastnr - t*lastr);
118 } else
119 printf("\t0\t%d\n", orient&UP ? 1 : -1);
120 }
121 if (!(orient&(IN|OUT))) {
122 printf("\n%s %s %s.%d\n", modname,
123 orient&DOWN ? "tube" : "cylinder",
124 argv[2], i);
125 printf("0\n0\n7\n");
126 printf("\t0\t0\t%15.9g\n", lastz);
127 printf("\t0\t0\t%15.9g\n", z);
128 printf("\t%15.9g\n", r);
129 } else if (!(orient&(UP|DOWN))) {
130 printf("\n%s ring %s.%d\n", modname, argv[2], i);
131 printf("0\n0\n8\n");
132 printf("\t0\t0\t%15.9g\n", z);
133 printf("\t0\t0\t%15.9g\n", orient&IN ? 1.0 : -1.0);
134 printf("\t%15.9g\t%15.9g\n", lastr, r);
135 } else {
136 printf("\n%s %s %s.%d\n", modname,
137 orient&DOWN ? "cup" : "cone",
138 argv[2], i);
139 printf("0\n0\n8\n");
140 printf("\t0\t0\t%15.9g\n", lastz);
141 printf("\t0\t0\t%15.9g\n", z);
142 printf("\t%15.9g\t%15.9g\n", lastr, r);
143 }
144 endfor:
145 lastz = z; lastr = r;
146 z = nextz; r = nextr;
147 lastnz = nz; lastnr = nr;
148 nz = nextnz; nr = nextnr;
149 }
150 quit(0);
151
152 userror:
153 fprintf(stderr,
154 "Usage: %s material name z(t) r(t) nseg [-e expr] [-f file] [-s]\n",
155 argv[0]);
156 quit(1);
157 }
158
159
160 computen(nzp, nrp, z0, r0, z1, r1) /* compute normal */
161 double *nzp, *nrp, z0, r0, z1, r1;
162 {
163 extern double sqrt();
164 double dr, dz, len;
165
166 dz = r0 - r1; /* right angle vector */
167 dr = z1 - z0;
168 len = sqrt(dr*dr + dz*dz);
169 *nzp = dz/len;
170 *nrp = dr/len;
171 }
172
173
174 eputs(msg)
175 char *msg;
176 {
177 fputs(msg, stderr);
178 }
179
180
181 wputs(msg)
182 char *msg;
183 {
184 eputs(msg);
185 }
186
187
188 quit(code)
189 {
190 exit(code);
191 }
192
193
194 printhead(ac, av) /* print command header */
195 register int ac;
196 register char **av;
197 {
198 putchar('#');
199 while (ac--) {
200 putchar(' ');
201 fputs(*av++, stdout);
202 }
203 putchar('\n');
204 }
205
206
207 double
208 l_hermite()
209 {
210 double t;
211
212 t = argument(5);
213 return( argument(1)*((2.0*t-3.0)*t*t+1.0) +
214 argument(2)*(-2.0*t+3.0)*t*t +
215 argument(3)*((t-2.0)*t+1.0)*t +
216 argument(4)*(t-1.0)*t*t );
217 }
218
219
220 double
221 l_bezier()
222 {
223 double t;
224
225 t = argument(5);
226 return( argument(1) * (1.+t*(-3.+t*(3.-t))) +
227 argument(2) * 3.*t*(1.+t*(-2.+t)) +
228 argument(3) * 3.*t*t*(1.-t) +
229 argument(4) * t*t*t );
230 }
231
232
233 double
234 l_bspline()
235 {
236 double t;
237
238 t = argument(5);
239 return( argument(1) * (1./6.+t*(-1./2.+t*(1./2.-1./6.*t))) +
240 argument(2) * (2./3.+t*t*(-1.+1./2.*t)) +
241 argument(3) * (1./6.+t*(1./2.+t*(1./2.-1./2.*t))) +
242 argument(4) * (1./6.*t*t*t) );
243 }