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root/radiance/ray/src/hd/rholo2.c
Revision: 3.28
Committed: Thu Jan 1 11:21:55 2004 UTC (20 years, 3 months ago) by schorsch
Content type: text/plain
Branch: MAIN
CVS Tags: rad4R2P2, rad5R0, rad3R7P2, rad3R7P1, rad4R2, rad4R1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9, rad4R2P1
Changes since 3.27: +47 -28 lines
Log Message:
Ansification and prototypes.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: rholo2.c,v 3.27 2003/07/27 22:12:02 schorsch Exp $";
3 #endif
4 /*
5 * Rtrace support routines for holodeck rendering
6 */
7
8 #include <time.h>
9
10 #include "rholo.h"
11 #include "paths.h"
12 #include "random.h"
13
14
15 VIEWPOINT myeye; /* target view position */
16
17 struct gclim {
18 HOLO *hp; /* holodeck pointer */
19 GCOORD gc; /* grid cell */
20 FVECT egp; /* eye grid point */
21 double erg2; /* mean square eye grid range */
22 double gmin[2], gmax[2]; /* grid coordinate limits */
23 }; /* a grid coordinate range */
24
25 static void initeyelim(struct gclim *gcl, HOLO *hp, GCOORD *gc);
26 static void groweyelim(struct gclim *gcl, GCOORD *gc,
27 double r0, double r1, int tight);
28 static int clipeyelim(short rrng[2][2], struct gclim *gcl);
29
30
31 static void
32 initeyelim( /* initialize grid coordinate limits */
33 register struct gclim *gcl,
34 register HOLO *hp,
35 GCOORD *gc
36 )
37 {
38 register RREAL *v;
39 register int i;
40
41 if (hp != NULL) {
42 hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt);
43 gcl->erg2 = 0;
44 for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3)
45 gcl->erg2 += DOT(v,v);
46 gcl->erg2 *= (1./3.) * myeye.rng*myeye.rng;
47 }
48 if (gc != NULL)
49 gcl->gc = *gc;
50 gcl->gmin[0] = gcl->gmin[1] = FHUGE;
51 gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
52 }
53
54
55 static void
56 groweyelim( /* grow grid limits about eye point */
57 register struct gclim *gcl,
58 GCOORD *gc,
59 double r0,
60 double r1,
61 int tight
62 )
63 {
64 FVECT gp, ab;
65 double ab2, od, cfact;
66 double sqcoef[3], ctcoef[3], licoef[3], cnst;
67 int gw, gi[2];
68 double wallpos, a, b, c, d, e, f;
69 double root[2], yex;
70 int n, i, j, nex;
71 /* point/view cone */
72 i = gc->w>>1;
73 gp[i] = gc->w&1 ? gcl->hp->grid[i] : 0;
74 gp[hdwg0[gc->w]] = gc->i[0] + r0;
75 gp[hdwg1[gc->w]] = gc->i[1] + r1;
76 VSUB(ab, gcl->egp, gp);
77 ab2 = DOT(ab, ab);
78 gw = gcl->gc.w>>1;
79 if ((i==gw ? ab[gw]*ab[gw] : ab2) <= gcl->erg2 + FTINY) {
80 gcl->gmin[0] = gcl->gmin[1] = -FHUGE;
81 gcl->gmax[0] = gcl->gmax[1] = FHUGE;
82 return; /* too close (to wall) */
83 }
84 ab2 = 1./ab2; /* 1/norm2(ab) */
85 od = DOT(gp, ab); /* origin dot direction */
86 cfact = 1./(1. - ab2*gcl->erg2); /* tan^2 + 1 of cone angle */
87 for (i = 0; i < 3; i++) { /* compute cone equation */
88 sqcoef[i] = ab[i]*ab[i]*cfact*ab2 - 1.;
89 ctcoef[i] = 2.*ab[i]*ab[(i+1)%3]*cfact*ab2;
90 licoef[i] = 2.*(gp[i] - ab[i]*cfact*od*ab2);
91 }
92 cnst = cfact*od*od*ab2 - DOT(gp,gp);
93 /*
94 * CONE: sqcoef[0]*x*x + sqcoef[1]*y*y + sqcoef[2]*z*z
95 * + ctcoef[0]*x*y + ctcoef[1]*y*z + ctcoef[2]*z*x
96 * + licoef[0]*x + licoef[1]*y + licoef[2]*z + cnst == 0
97 */
98 /* equation for conic section in plane */
99 gi[0] = hdwg0[gcl->gc.w];
100 gi[1] = hdwg1[gcl->gc.w];
101 wallpos = gcl->gc.w&1 ? gcl->hp->grid[gw] : 0;
102 a = sqcoef[gi[0]]; /* x2 */
103 b = ctcoef[gi[0]]; /* xy */
104 c = sqcoef[gi[1]]; /* y2 */
105 d = ctcoef[gw]*wallpos + licoef[gi[0]]; /* x */
106 e = ctcoef[gi[1]]*wallpos + licoef[gi[1]]; /* y */
107 f = wallpos*(wallpos*sqcoef[gw] + licoef[gw]) + cnst;
108 for (i = 0; i < 2; i++) {
109 if (i) { /* swap x and y coefficients */
110 register double t;
111 t = a; a = c; c = t;
112 t = d; d = e; e = t;
113 }
114 nex = 0; /* check global extrema */
115 n = quadratic(root, a*(4.*a*c-b*b), 2.*a*(2.*c*d-b*e),
116 d*(c*d-b*e) + f*b*b);
117 while (n-- > 0) {
118 if (gc->w>>1 == gi[i] &&
119 (gc->w&1) ^ (root[n] < gp[gc->w>>1])) {
120 if (gc->w&1)
121 gcl->gmin[i] = -FHUGE;
122 else
123 gcl->gmax[i] = FHUGE;
124 nex++;
125 continue; /* hyperbolic */
126 }
127 if (tight) {
128 yex = (-2.*a*root[n] - d)/b;
129 if (yex < gcl->gc.i[1-i] ||
130 yex > gcl->gc.i[1-i]+1)
131 continue; /* outside cell */
132 }
133 if (root[n] < gcl->gmin[i])
134 gcl->gmin[i] = root[n];
135 if (root[n] > gcl->gmax[i])
136 gcl->gmax[i] = root[n];
137 nex++;
138 }
139 /* check local extrema */
140 for (j = nex < 2 ? 2 : 0; j--; ) {
141 yex = gcl->gc.i[1-i] + j;
142 n = quadratic(root, a, b*yex+d, yex*(yex*c+e)+f);
143 while (n-- > 0) {
144 if (gc->w>>1 == gi[i] &&
145 (gc->w&1) ^ (root[n] < gp[gc->w>>1]))
146 continue;
147 if (root[n] < gcl->gmin[i])
148 gcl->gmin[i] = root[n];
149 if (root[n] > gcl->gmax[i])
150 gcl->gmax[i] = root[n];
151 }
152 }
153 }
154 }
155
156
157 static int
158 clipeyelim( /* clip eye limits to grid cell */
159 register short rrng[2][2],
160 register struct gclim *gcl
161 )
162 {
163 int incell = 1;
164 register int i;
165
166 for (i = 0; i < 2; i++) {
167 if (gcl->gmin[i] < gcl->gc.i[i])
168 gcl->gmin[i] = gcl->gc.i[i];
169 if (gcl->gmax[i] > gcl->gc.i[i]+1)
170 gcl->gmax[i] = gcl->gc.i[i]+1;
171 if (gcl->gmax[i] > gcl->gmin[i]) {
172 rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) +
173 (1.-FTINY);
174 rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) +
175 (1.-FTINY) - rrng[i][0];
176 } else
177 rrng[i][0] = rrng[i][1] = 0;
178 incell &= rrng[i][1] > 0;
179 }
180 return(incell);
181 }
182
183
184 extern void
185 packrays( /* pack ray origins and directions */
186 register float *rod,
187 register PACKET *p
188 )
189 {
190 #if 0
191 double dist2sum = 0.;
192 FVECT vt;
193 #endif
194 int nretries = p->nr + 2;
195 struct gclim eyelim;
196 short rrng0[2][2], rrng1[2][2];
197 int useyelim;
198 GCOORD gc[2];
199 FVECT ro, rd;
200 double d;
201 register int i;
202
203 if (!hdbcoord(gc, hdlist[p->hd], p->bi))
204 error(CONSISTENCY, "bad beam index in packrays");
205 if ((useyelim = myeye.rng > FTINY)) {
206 initeyelim(&eyelim, hdlist[p->hd], gc);
207 groweyelim(&eyelim, gc+1, 0., 0., 0);
208 groweyelim(&eyelim, gc+1, 1., 1., 0);
209 useyelim = clipeyelim(rrng0, &eyelim);
210 #ifdef DEBUG
211 if (!useyelim)
212 error(WARNING, "no eye overlap in packrays");
213 #endif
214 }
215 for (i = 0; i < p->nr; i++) {
216 retry:
217 if (useyelim) {
218 initeyelim(&eyelim, NULL, gc+1);
219 p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1])
220 + rrng0[0][0];
221 p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1])
222 + rrng0[1][0];
223 groweyelim(&eyelim, gc,
224 (1./256.)*(p->ra[i].r[0][0]+.5),
225 (1./256.)*(p->ra[i].r[0][1]+.5), 1);
226 if (!clipeyelim(rrng1, &eyelim)) {
227 useyelim = nretries-- > 0;
228 #ifdef DEBUG
229 if (!useyelim)
230 error(WARNING,
231 "exceeded retry limit in packrays");
232 #endif
233 goto retry;
234 }
235 p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1])
236 + rrng1[0][0];
237 p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1])
238 + rrng1[1][0];
239 } else {
240 p->ra[i].r[0][0] = frandom() * 256.;
241 p->ra[i].r[0][1] = frandom() * 256.;
242 p->ra[i].r[1][0] = frandom() * 256.;
243 p->ra[i].r[1][1] = frandom() * 256.;
244 }
245 d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r);
246 #if 0
247 VSUM(vt, ro, rd, d);
248 dist2sum += dist2line(myeye.vpt, ro, vt);
249 #endif
250 if (p->offset != NULL) {
251 if (!vdef(OBSTRUCTIONS))
252 d *= frandom(); /* random offset */
253 VSUM(ro, ro, rd, d); /* advance ray */
254 p->offset[i] = d;
255 }
256 VCOPY(rod, ro);
257 rod += 3;
258 VCOPY(rod, rd);
259 rod += 3;
260 }
261 #if 0
262 fprintf(stderr, "%f RMS (%d retries)\t", sqrt(dist2sum/p->nr),
263 p->nr + 2 - nretries);
264 #endif
265 }
266
267
268 extern void
269 donerays( /* encode finished ray computations */
270 register PACKET *p,
271 register float *rvl
272 )
273 {
274 double d;
275 register int i;
276
277 for (i = 0; i < p->nr; i++) {
278 setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]);
279 d = rvl[3];
280 if (p->offset != NULL)
281 d += p->offset[i];
282 p->ra[i].d = hdcode(hdlist[p->hd], d);
283 rvl += 4;
284 }
285 p->nc += p->nr;
286 }
287
288
289 extern int
290 done_rtrace(void) /* clean up and close rtrace calculation */
291 {
292 int status;
293 /* already closed? */
294 if (!nprocs)
295 return(0);
296 /* flush beam queue */
297 done_packets(flush_queue());
298 /* sync holodeck */
299 hdsync(NULL, 1);
300 /* close rtrace */
301 if ((status = end_rtrace()))
302 error(WARNING, "bad exit status from rtrace");
303 if (vdef(REPORT)) { /* report time */
304 eputs("rtrace process closed\n");
305 report(0);
306 }
307 return(status); /* return status */
308 }
309
310
311 extern void
312 new_rtrace(void) /* restart rtrace calculation */
313 {
314 char combuf[128];
315
316 if (nprocs > 0) /* already running? */
317 return;
318 starttime = time(NULL); /* reset start time and counts */
319 npacksdone = nraysdone = 0L;
320 if (vdef(TIME)) /* reset end time */
321 endtime = starttime + vflt(TIME)*3600. + .5;
322 if (vdef(RIF)) { /* rerun rad to update octree */
323 sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF));
324 if (system(combuf))
325 error(WARNING, "error running rad");
326 }
327 if (start_rtrace() < 1) /* start rtrace */
328 error(WARNING, "cannot restart rtrace");
329 else if (vdef(REPORT)) {
330 eputs("rtrace process restarted\n");
331 report(0);
332 }
333 }
334
335
336 extern int
337 getradfile(void) /* run rad and get needed variables */
338 {
339 static short mvar[] = {OCTREE,EYESEP,-1};
340 static char tf1[] = TEMPLATE;
341 char tf2[64];
342 char combuf[256];
343 char *pippt = NULL;
344 register int i;
345 register char *cp;
346 /* check if rad file specified */
347 if (!vdef(RIF))
348 return(0);
349 /* create rad command */
350 mktemp(tf1);
351 sprintf(tf2, "%s.rif", tf1);
352 sprintf(combuf,
353 "rad -v 0 -s -e -w %s OPTFILE=%s | egrep '^[ \t]*(NOMATCH",
354 vval(RIF), tf1);
355 cp = combuf;
356 while (*cp){
357 if (*cp == '|') pippt = cp;
358 cp++;
359 } /* match unset variables */
360 for (i = 0; mvar[i] >= 0; i++)
361 if (!vdef(mvar[i])) {
362 *cp++ = '|';
363 strcpy(cp, vnam(mvar[i]));
364 while (*cp) cp++;
365 pippt = NULL;
366 }
367 if (pippt != NULL)
368 strcpy(pippt, "> " NULL_DEVICE); /* nothing to match */
369 else
370 sprintf(cp, ")[ \t]*=' > %s", tf2);
371 #ifdef DEBUG
372 wputs(combuf); wputs("\n");
373 #endif
374 system(combuf); /* ignore exit code */
375 if (pippt == NULL) {
376 loadvars(tf2); /* load variables */
377 unlink(tf2);
378 }
379 rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
380 unlink(tf1); /* clean up */
381 return(1);
382 }
383
384
385 extern void
386 report( /* report progress so far */
387 time_t t
388 )
389 {
390 static time_t seconds2go = 1000000;
391
392 if (t == 0L)
393 t = time(NULL);
394 sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
395 npacksdone, nraysdone, (t-starttime)/3600.);
396 eputs(errmsg);
397 if (seconds2go == 1000000)
398 seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
399 if (seconds2go)
400 reporttime = t + seconds2go;
401 }