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 |
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|
32 |
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SRCREC *source = NULL; /* our list of sources */ |
33 |
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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 |
|
register int sn; |
307 |
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register CONTRIB *srccnt; |
308 |
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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 |
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RAY sr; |
312 |
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|
313 |
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srccnt = (CONTRIB *)malloc(nsources*sizeof(CONTRIB)); |
314 |
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cntord = (CNTPTR *)malloc(nsources*sizeof(CNTPTR)); |
315 |
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if (srccnt == NULL || cntord == NULL) |
316 |
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error(SYSTEM, "out of memory in direct"); |
317 |
+ |
/* compute number to check */ |
318 |
+ |
nshadcheck = pow((double)nsources, shadcert) + .5; |
319 |
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/* modify threshold */ |
320 |
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ourthresh = shadthresh / r->rweight; |
321 |
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/* potential contributions */ |
329 |
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/* compute coefficient */ |
330 |
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(*f)(srccnt[sn].val, p, srccnt[sn].dir, srccnt[sn].dom); |
331 |
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cntord[sn].brt = bright(srccnt[sn].val); |
332 |
< |
if (cntord[sn].brt <= FTINY) |
332 |
> |
if (cntord[sn].brt <= 0.0) |
333 |
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continue; |
334 |
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/* compute intersection */ |
335 |
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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 |
|
} |