ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/hd/rholo2.c
Revision: 3.20
Committed: Thu Dec 3 15:21:05 1998 UTC (25 years, 4 months ago) by gwlarson
Content type: text/plain
Branch: MAIN
Changes since 3.19: +67 -74 lines
Log Message:
improved sampling in packrays() but still not perfect

File Contents

# Content
1 /* Copyright (c) 1998 Silicon Graphics, Inc. */
2
3 #ifndef lint
4 static char SCCSid[] = "$SunId$ SGI";
5 #endif
6
7 /*
8 * Rtrace support routines for holodeck rendering
9 */
10
11 #include "rholo.h"
12 #include "paths.h"
13 #include "random.h"
14
15
16 VIEWPOINT myeye; /* target view position */
17
18 struct gclim {
19 HOLO *hp; /* holodeck pointer */
20 GCOORD gc; /* grid cell */
21 FVECT egp; /* eye grid point */
22 double erg2; /* mean square eye grid range */
23 double gmin[2], gmax[2]; /* grid coordinate limits */
24 }; /* a grid coordinate range */
25
26
27 static
28 initeyelim(gcl, hp, gc) /* initialize grid coordinate limits */
29 register struct gclim *gcl;
30 register HOLO *hp;
31 GCOORD *gc;
32 {
33 register FLOAT *v;
34 register int i;
35
36 if (hp != NULL) {
37 hdgrid(gcl->egp, gcl->hp = hp, myeye.vpt);
38 gcl->erg2 = 0;
39 for (i = 0, v = hp->wg[0]; i < 3; i++, v += 3)
40 gcl->erg2 += DOT(v,v);
41 gcl->erg2 *= (1./3.) * myeye.rng*myeye.rng;
42 }
43 if (gc != NULL)
44 copystruct(&gcl->gc, gc);
45 gcl->gmin[0] = gcl->gmin[1] = FHUGE;
46 gcl->gmax[0] = gcl->gmax[1] = -FHUGE;
47 }
48
49
50 static
51 groweyelim(gcl, gc, r0, r1) /* grow grid limits about eye point */
52 register struct gclim *gcl;
53 GCOORD *gc;
54 double r0, r1;
55 {
56 FVECT gp, ab;
57 double vlen, plen, dv0, dv1;
58 double rd2, dwall, gpos;
59 int eyeout;
60 register int i, g0, g1;
61
62 i = gc->w>>1;
63 if (gc->w&1)
64 eyeout = (gp[i] = gcl->hp->grid[i]) < gcl->egp[i];
65 else
66 eyeout = (gp[i] = 0) > gcl->egp[i];
67 gp[hdwg0[gc->w]] = gc->i[0] + r0;
68 gp[hdwg1[gc->w]] = gc->i[1] + r1;
69 VSUB(ab, gcl->egp, gp);
70 rd2 = DOT(ab,ab);
71 if (rd2 <= gcl->erg2) {
72 gcl->gmin[0] = gcl->gmin[1] = -FHUGE;
73 gcl->gmax[0] = gcl->gmax[1] = FHUGE;
74 return;
75 }
76 rd2 = gcl->erg2 / rd2;
77 vlen = 1. - rd2;
78 plen = sqrt(rd2 * vlen);
79 g0 = gcl->gc.w>>1;
80 dwall = (gcl->gc.w&1 ? gcl->hp->grid[g0] : 0) - gp[g0];
81 for (i = 0; i < 4; i++) {
82 if (i == 2)
83 plen = -plen;
84 g1 = (g0+(i&1)+1)%3;
85 dv0 = vlen*ab[g0] + plen*ab[g1];
86 dv1 = vlen*ab[g1] - plen*ab[g0];
87 if ((dv0 < 0 ^ dwall < 0 ^ eyeout) ||
88 (dv0 <= FTINY && dv0 >= -FTINY)) {
89 if (eyeout)
90 dv1 = -dv1;
91 if (dv1 > FTINY)
92 gcl->gmax[i&1] = FHUGE;
93 else if (dv1 < -FTINY)
94 gcl->gmin[i&1] = -FHUGE;
95 } else {
96 gpos = gp[g1] + dv1*dwall/dv0;
97 if (gpos < gcl->gmin[i&1])
98 gcl->gmin[i&1] = gpos;
99 if (gpos > gcl->gmax[i&1])
100 gcl->gmax[i&1] = gpos;
101 }
102 }
103 }
104
105
106 static int
107 clipeyelim(rrng, gcl) /* clip eye limits to grid cell */
108 register short rrng[2][2];
109 register struct gclim *gcl;
110 {
111 int incell = 1;
112 register int i;
113
114 for (i = 0; i < 2; i++) {
115 if (gcl->gmin[i] < gcl->gc.i[i])
116 gcl->gmin[i] = gcl->gc.i[i];
117 if (gcl->gmax[i] > gcl->gc.i[i]+1)
118 gcl->gmax[i] = gcl->gc.i[i]+1;
119 if (gcl->gmax[i] > gcl->gmin[i]) {
120 rrng[i][0] = 256.*(gcl->gmin[i] - gcl->gc.i[i]) +
121 (1.-FTINY);
122 rrng[i][1] = 256.*(gcl->gmax[i] - gcl->gc.i[i]) +
123 (1.-FTINY) - rrng[i][0];
124 } else
125 rrng[i][0] = rrng[i][1] = 0;
126 incell &= rrng[i][1] > 0;
127 }
128 return(incell);
129 }
130
131
132 packrays(rod, p) /* pack ray origins and directions */
133 register float *rod;
134 register PACKET *p;
135 {
136 int nretries = p->nr + 2;
137 struct gclim eyelim;
138 short rrng0[2][2], rrng1[2][2];
139 int useyelim;
140 GCOORD gc[2];
141 FVECT ro, rd;
142 double d;
143 register int i;
144
145 if (!hdbcoord(gc, hdlist[p->hd], p->bi))
146 error(CONSISTENCY, "bad beam index in packrays");
147 if ((useyelim = myeye.rng > FTINY)) {
148 initeyelim(&eyelim, hdlist[p->hd], gc);
149 groweyelim(&eyelim, gc+1, 0., 0.);
150 groweyelim(&eyelim, gc+1, 1., 1.);
151 useyelim &= clipeyelim(rrng0, &eyelim);
152 }
153 for (i = 0; i < p->nr; i++) {
154 retry:
155 if (useyelim) {
156 initeyelim(&eyelim, NULL, gc+1);
157 p->ra[i].r[0][0] = (int)(frandom()*rrng0[0][1])
158 + rrng0[0][0];
159 p->ra[i].r[0][1] = (int)(frandom()*rrng0[1][1])
160 + rrng0[1][0];
161 groweyelim(&eyelim, gc,
162 (1./256.)*(p->ra[i].r[0][0]+.5),
163 (1./256.)*(p->ra[i].r[0][1]+.5));
164 if (!clipeyelim(rrng1, &eyelim)) {
165 useyelim &= nretries-- > 0;
166 goto retry;
167 }
168 p->ra[i].r[1][0] = (int)(frandom()*rrng1[0][1])
169 + rrng1[0][0];
170 p->ra[i].r[1][1] = (int)(frandom()*rrng1[1][1])
171 + rrng1[1][0];
172 } else {
173 p->ra[i].r[0][0] = frandom() * 256.;
174 p->ra[i].r[0][1] = frandom() * 256.;
175 p->ra[i].r[1][0] = frandom() * 256.;
176 p->ra[i].r[1][1] = frandom() * 256.;
177 }
178 d = hdray(ro, rd, hdlist[p->hd], gc, p->ra[i].r);
179 if (p->offset != NULL) {
180 if (!vdef(OBSTRUCTIONS))
181 d *= frandom(); /* random offset */
182 VSUM(ro, ro, rd, d); /* advance ray */
183 p->offset[i] = d;
184 }
185 VCOPY(rod, ro);
186 rod += 3;
187 VCOPY(rod, rd);
188 rod += 3;
189 }
190 }
191
192
193 donerays(p, rvl) /* encode finished ray computations */
194 register PACKET *p;
195 register float *rvl;
196 {
197 double d;
198 register int i;
199
200 for (i = 0; i < p->nr; i++) {
201 setcolr(p->ra[i].v, rvl[0], rvl[1], rvl[2]);
202 d = rvl[3];
203 if (p->offset != NULL)
204 d += p->offset[i];
205 p->ra[i].d = hdcode(hdlist[p->hd], d);
206 rvl += 4;
207 }
208 p->nc += p->nr;
209 }
210
211
212 int
213 done_rtrace() /* clean up and close rtrace calculation */
214 {
215 int status;
216 /* already closed? */
217 if (!nprocs)
218 return;
219 /* flush beam queue */
220 done_packets(flush_queue());
221 /* sync holodeck */
222 hdsync(NULL, 1);
223 /* close rtrace */
224 if ((status = end_rtrace()))
225 error(WARNING, "bad exit status from rtrace");
226 if (vdef(REPORT)) { /* report time */
227 eputs("rtrace process closed\n");
228 report(0);
229 }
230 return(status); /* return status */
231 }
232
233
234 new_rtrace() /* restart rtrace calculation */
235 {
236 char combuf[128];
237
238 if (nprocs > 0) /* already running? */
239 return;
240 starttime = time(NULL); /* reset start time and counts */
241 npacksdone = nraysdone = 0L;
242 if (vdef(TIME)) /* reset end time */
243 endtime = starttime + vflt(TIME)*3600. + .5;
244 if (vdef(RIF)) { /* rerun rad to update octree */
245 sprintf(combuf, "rad -v 0 -s -w %s", vval(RIF));
246 if (system(combuf))
247 error(WARNING, "error running rad");
248 }
249 if (start_rtrace() < 1) /* start rtrace */
250 error(WARNING, "cannot restart rtrace");
251 else if (vdef(REPORT)) {
252 eputs("rtrace process restarted\n");
253 report(0);
254 }
255 }
256
257
258 getradfile() /* run rad and get needed variables */
259 {
260 static short mvar[] = {OCTREE,EYESEP,-1};
261 static char tf1[] = TEMPLATE;
262 char tf2[64];
263 char combuf[256];
264 char *pippt;
265 register int i;
266 register char *cp;
267 /* check if rad file specified */
268 if (!vdef(RIF))
269 return(0);
270 /* create rad command */
271 mktemp(tf1);
272 sprintf(tf2, "%s.rif", tf1);
273 sprintf(combuf,
274 "rad -v 0 -s -e -w %s OPTFILE=%s | egrep '^[ \t]*(NOMATCH",
275 vval(RIF), tf1);
276 cp = combuf;
277 while (*cp){
278 if (*cp == '|') pippt = cp;
279 cp++;
280 } /* match unset variables */
281 for (i = 0; mvar[i] >= 0; i++)
282 if (!vdef(mvar[i])) {
283 *cp++ = '|';
284 strcpy(cp, vnam(mvar[i]));
285 while (*cp) cp++;
286 pippt = NULL;
287 }
288 if (pippt != NULL)
289 strcpy(pippt, "> /dev/null"); /* nothing to match */
290 else
291 sprintf(cp, ")[ \t]*=' > %s", tf2);
292 #ifdef DEBUG
293 wputs(combuf); wputs("\n");
294 #endif
295 system(combuf); /* ignore exit code */
296 if (pippt == NULL) {
297 loadvars(tf2); /* load variables */
298 unlink(tf2);
299 }
300 rtargc += wordfile(rtargv+rtargc, tf1); /* get rtrace options */
301 unlink(tf1); /* clean up */
302 return(1);
303 }
304
305
306 report(t) /* report progress so far */
307 time_t t;
308 {
309 static time_t seconds2go = 1000000;
310
311 if (t == 0L)
312 t = time(NULL);
313 sprintf(errmsg, "%ld packets (%ld rays) done after %.2f hours\n",
314 npacksdone, nraysdone, (t-starttime)/3600.);
315 eputs(errmsg);
316 if (seconds2go == 1000000)
317 seconds2go = vdef(REPORT) ? (long)(vflt(REPORT)*60. + .5) : 0L;
318 if (seconds2go)
319 reporttime = t + seconds2go;
320 }