| 27 |
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|
| 28 |
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extern double dstrsrc; /* source distribution amount */ |
| 29 |
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extern double shadthresh; /* relative shadow threshold */ |
| 30 |
+ |
extern double shadcert; /* shadow testing certainty */ |
| 31 |
|
|
| 32 |
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SRCREC *source = NULL; /* our list of sources */ |
| 33 |
|
int nsources = 0; /* the number of sources */ |
| 302 |
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int (*f)(); /* direct component coefficient function */ |
| 303 |
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char *p; /* data for f */ |
| 304 |
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{ |
| 305 |
+ |
extern double pow(); |
| 306 |
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register int sn; |
| 307 |
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register CONTRIB *srccnt; |
| 308 |
|
register CNTPTR *cntord; |
| 309 |
< |
int ncnts; |
| 310 |
< |
double ourthresh, prob, hwt, test2, hit2; |
| 309 |
> |
int nshadcheck, ncnts; |
| 310 |
> |
double prob, ourthresh, hwt, test2, hit2; |
| 311 |
|
RAY sr; |
| 312 |
|
|
| 313 |
|
srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
| 314 |
|
cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
| 315 |
|
if (srccnt == NULL || cntord == NULL) |
| 316 |
|
error(SYSTEM, "out of memory in direct"); |
| 317 |
+ |
/* compute number to check */ |
| 318 |
+ |
nshadcheck = pow((double)nsources, shadcert) + .5; |
| 319 |
|
/* modify threshold */ |
| 320 |
|
ourthresh = shadthresh / r->rweight; |
| 321 |
|
/* potential contributions */ |
| 329 |
|
/* compute coefficient */ |
| 330 |
|
(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
| 331 |
|
cntord[sn].brt = bright(srccnt[sn].val); |
| 332 |
< |
if (cntord[sn].brt <= FTINY) |
| 332 |
> |
if (cntord[sn].brt <= 0.0) |
| 333 |
|
continue; |
| 334 |
|
/* compute intersection */ |
| 335 |
|
if (!( source[sn].sflags & SDISTANT ? |
| 344 |
|
} |
| 345 |
|
/* sort contributions */ |
| 346 |
|
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
| 347 |
< |
hit2 = 0.0; test2 = FTINY; |
| 348 |
< |
/* find last */ |
| 349 |
< |
sn = 0; ncnts = nsources; |
| 350 |
< |
while (sn < ncnts-1) { |
| 351 |
< |
register int m; |
| 352 |
< |
m = (sn + ncnts) >> 1; |
| 353 |
< |
if (cntord[m].brt > 0.0) |
| 354 |
< |
sn = m; |
| 355 |
< |
else |
| 356 |
< |
ncnts = m; |
| 347 |
> |
{ /* find last */ |
| 348 |
> |
register int l, m; |
| 349 |
> |
|
| 350 |
> |
sn = 0; ncnts = l = nsources; |
| 351 |
> |
while ((m = (sn + ncnts) >> 1) != l) { |
| 352 |
> |
if (cntord[m].brt > 0.0) |
| 353 |
> |
sn = m; |
| 354 |
> |
else |
| 355 |
> |
ncnts = m; |
| 356 |
> |
l = m; |
| 357 |
> |
} |
| 358 |
|
} |
| 359 |
< |
/* accumulate tail */ |
| 360 |
< |
for (sn = ncnts-1; sn > 0; sn--) |
| 361 |
< |
cntord[sn-1].brt += cntord[sn].brt; |
| 362 |
< |
/* shadow testing */ |
| 359 |
> |
/* accumulate tail */ |
| 360 |
> |
for (sn = ncnts-1; sn > 0; sn--) |
| 361 |
> |
cntord[sn-1].brt += cntord[sn].brt; |
| 362 |
> |
/* start with prob=.5 */ |
| 363 |
> |
hit2 = 0.5; test2 = 1.0; |
| 364 |
> |
/* test for shadows */ |
| 365 |
|
for (sn = 0; sn < ncnts; sn++) { |
| 366 |
< |
/* tail below threshold? */ |
| 367 |
< |
if (cntord[sn].brt < ourthresh*bright(r->rcol)) |
| 366 |
> |
/* check threshold */ |
| 367 |
> |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
| 368 |
> |
cntord[sn].brt-cntord[sn+nshadcheck].brt) < |
| 369 |
> |
ourthresh*bright(r->rcol)) |
| 370 |
|
break; |
| 371 |
|
/* get statistics */ |
| 372 |
|
hwt = (double)source[cntord[sn].sno].nhits / |
| 379 |
|
if (localhit(&sr, &thescene) && |
| 380 |
|
sr.ro != source[cntord[sn].sno].so) { |
| 381 |
|
/* check for transmission */ |
| 382 |
< |
if (sr.clipset != NULL && inset(sr.clipset,sr.ro->omod)) |
| 374 |
< |
raytrans(&sr); /* object is clipped */ |
| 375 |
< |
else |
| 376 |
< |
rayshade(&sr, sr.ro->omod); |
| 382 |
> |
rayshade(&sr, sr.ro->omod); |
| 383 |
|
if (bright(sr.rcol) <= FTINY) |
| 384 |
|
continue; /* missed! */ |
| 385 |
|
(*f)(srccnt[cntord[sn].sno].val, p, |
| 395 |
|
/* weighted hit rate */ |
| 396 |
|
hwt = hit2 / test2; |
| 397 |
|
#ifdef DEBUG |
| 398 |
< |
fprintf(stderr, "%d tested, %d untested, %f hit rate\n", |
| 398 |
> |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
| 399 |
|
sn, ncnts-sn, hwt); |
| 400 |
+ |
eputs(errmsg); |
| 401 |
|
#endif |
| 402 |
|
/* add in untested sources */ |
| 403 |
|
for ( ; sn < ncnts; sn++) { |
| 406 |
|
scalecolor(srccnt[cntord[sn].sno].val, prob); |
| 407 |
|
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
| 408 |
|
} |
| 409 |
+ |
|
| 410 |
|
free(srccnt); |
| 411 |
|
free(cntord); |
| 412 |
|
} |
| 428 |
|
register OBJREC *m; |
| 429 |
|
register RAY *r; |
| 430 |
|
{ |
| 423 |
– |
/* check for behind */ |
| 424 |
– |
if (r->rod < 0.0) |
| 425 |
– |
return; |
| 431 |
|
/* check for over-counting */ |
| 432 |
|
if (wrongsource(m, r) || badambient(m, r)) |
| 433 |
|
return; |
| 441 |
|
|
| 442 |
|
/* otherwise treat as source */ |
| 443 |
|
} else { |
| 444 |
+ |
/* check for behind */ |
| 445 |
+ |
if (r->rod < 0.0) |
| 446 |
+ |
return; |
| 447 |
|
/* get distribution pattern */ |
| 448 |
|
raytexture(r, m->omod); |
| 449 |
|
/* get source color */ |
