ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/gen/genrev.c
Revision: 1.10
Committed: Tue Aug 13 16:07:10 1991 UTC (32 years, 7 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 1.9: +2 -2 lines
Log Message:
changed private variable names with `SYS` context

File Contents

# User Rev Content
1 greg 1.1 #ifndef lint
2     static char SCCSid[] = "$SunId$ LBL";
3     #endif
4 greg 1.2
5 greg 1.5 /* Copyright (c) 1989 Regents of the University of California */
6    
7 greg 1.2 /*
8 greg 1.1 * 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 greg 1.10 #define ZNAME "Z`SYS`" /* z function name */
20     #define RNAME "R`SYS`" /* r function name */
21 greg 1.1
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 greg 1.5 double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument();
32 greg 1.1
33    
34     main(argc, argv)
35     int argc;
36     char *argv[];
37     {
38 greg 1.6 extern long eclock;
39 greg 1.1 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 greg 1.8 varset("PI", ':', PI);
48 greg 1.9 funset("hermite", 5, ':', l_hermite);
49     funset("bezier", 5, ':', l_bezier);
50     funset("bspline", 5, ':', l_bspline);
51 greg 1.1
52     if (argc < 6)
53     goto userror;
54    
55     for (i = 6; i < argc; i++)
56     if (!strcmp(argv[i], "-e"))
57 greg 1.7 scompile(argv[++i], NULL, 0);
58 greg 1.1 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 greg 1.7 scompile(stmp, NULL, 0);
67 greg 1.1 sprintf(stmp, "%s(t)=%s;", RNAME, argv[4]);
68 greg 1.7 scompile(stmp, NULL, 0);
69 greg 1.1 nseg = atoi(argv[5]);
70     if (nseg <= 0)
71     goto userror;
72 greg 1.3 modname = smooth ? "Phong" : argv[1];
73 greg 1.1
74     printhead(argc, argv);
75 greg 1.6 eclock = 0;
76 greg 1.1
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 greg 1.3 printf("\n%s texfunc Phong\n", argv[1]);
106 greg 1.1 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 greg 1.4 }
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 greg 1.5 }
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 greg 1.1 }