| 27 |
|
|
| 28 |
|
extern double dstrsrc; /* source distribution amount */ |
| 29 |
|
extern double shadthresh; /* relative shadow threshold */ |
| 30 |
+ |
extern double shadcert; /* shadow testing certainty */ |
| 31 |
|
|
| 32 |
|
SRCREC *source = NULL; /* our list of sources */ |
| 33 |
|
int nsources = 0; /* the number of sources */ |
| 302 |
|
int (*f)(); /* direct component coefficient function */ |
| 303 |
|
char *p; /* data for f */ |
| 304 |
|
{ |
| 305 |
+ |
extern double pow(); |
| 306 |
|
register int sn; |
| 307 |
|
register CONTRIB *srccnt; |
| 308 |
|
register CNTPTR *cntord; |
| 309 |
+ |
int nshadcheck, ncnts; |
| 310 |
|
double prob, ourthresh, hwt, test2, hit2; |
| 311 |
|
RAY sr; |
| 312 |
|
|
| 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 */ |
| 344 |
|
} |
| 345 |
|
/* sort contributions */ |
| 346 |
|
qsort(cntord, nsources, sizeof(CNTPTR), cntcmp); |
| 347 |
< |
hit2 = 0.5; test2 = 1.0; /* start with prob=.5 */ |
| 347 |
> |
/* find last */ |
| 348 |
> |
sn = 0; ncnts = nsources; |
| 349 |
> |
while (sn < ncnts-1) { |
| 350 |
> |
register int m; |
| 351 |
> |
m = (sn + ncnts) >> 1; |
| 352 |
> |
if (cntord[m].brt > 0.0) |
| 353 |
> |
sn = m; |
| 354 |
> |
else |
| 355 |
> |
ncnts = m; |
| 356 |
> |
} |
| 357 |
> |
/* accumulate tail */ |
| 358 |
> |
for (sn = ncnts-1; sn > 0; sn--) |
| 359 |
> |
cntord[sn-1].brt += cntord[sn].brt; |
| 360 |
> |
/* start with prob=.5 */ |
| 361 |
> |
hit2 = 0.5; test2 = 1.0; |
| 362 |
|
/* test for shadows */ |
| 363 |
< |
for (sn = 0; sn < nsources; sn++) { |
| 363 |
> |
for (sn = 0; sn < ncnts; sn++) { |
| 364 |
|
/* check threshold */ |
| 365 |
< |
if (cntord[sn].brt <= ourthresh*bright(r->rcol)) |
| 365 |
> |
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
| 366 |
> |
cntord[sn].brt-cntord[sn+nshadcheck].brt) < |
| 367 |
> |
ourthresh*bright(r->rcol)) |
| 368 |
|
break; |
| 369 |
|
/* get statistics */ |
| 370 |
|
hwt = (double)source[cntord[sn].sno].nhits / |
| 396 |
|
/* weighted hit rate */ |
| 397 |
|
hwt = hit2 / test2; |
| 398 |
|
#ifdef DEBUG |
| 399 |
< |
{ |
| 400 |
< |
int ntested = sn; |
| 399 |
> |
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
| 400 |
> |
sn, ncnts-sn, hwt); |
| 401 |
> |
eputs(errmsg); |
| 402 |
|
#endif |
| 403 |
|
/* add in untested sources */ |
| 404 |
< |
for ( ; sn < nsources; sn++) { |
| 383 |
< |
if (cntord[sn].brt <= 0.0) |
| 384 |
< |
break; |
| 404 |
> |
for ( ; sn < ncnts; sn++) { |
| 405 |
|
prob = hwt * (double)source[cntord[sn].sno].nhits / |
| 406 |
|
(double)source[cntord[sn].sno].ntests; |
| 407 |
|
scalecolor(srccnt[cntord[sn].sno].val, prob); |
| 408 |
|
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
| 409 |
|
} |
| 390 |
– |
#ifdef DEBUG |
| 391 |
– |
fprintf(stderr, "%d tested, %d untested, %f hit rate\n", |
| 392 |
– |
ntested, sn-ntested, hwt); |
| 393 |
– |
} |
| 394 |
– |
#endif |
| 410 |
|
|
| 411 |
|
free(srccnt); |
| 412 |
|
free(cntord); |
