313 |
|
extern double pow(); |
314 |
|
register int sn; |
315 |
|
int nshadcheck, ncnts; |
316 |
< |
double prob, ourthresh, hwt, test2, hit2; |
316 |
> |
int nhits; |
317 |
> |
double prob, ourthresh, hwt; |
318 |
|
RAY sr; |
319 |
|
/* NOTE: srccnt and cntord global so no recursion */ |
320 |
|
if (nsources <= 0) |
370 |
|
/* accumulate tail */ |
371 |
|
for (sn = ncnts-1; sn > 0; sn--) |
372 |
|
cntord[sn-1].brt += cntord[sn].brt; |
372 |
– |
/* start with prob=.5 */ |
373 |
– |
hit2 = 0.5; test2 = 1.0; |
373 |
|
/* test for shadows */ |
374 |
+ |
nhits = 0; |
375 |
|
for (sn = 0; sn < ncnts; sn++) { |
376 |
|
/* check threshold */ |
377 |
|
if ((sn+nshadcheck>=ncnts ? cntord[sn].brt : |
379 |
|
< ourthresh*bright(r->rcol)) |
380 |
|
break; |
381 |
|
/* get statistics */ |
382 |
– |
hwt = (double)source[cntord[sn].sno].nhits / |
383 |
– |
(double)source[cntord[sn].sno].ntests; |
384 |
– |
test2 += hwt; |
382 |
|
source[cntord[sn].sno].ntests++; |
383 |
|
/* test for hit */ |
384 |
|
rayorigin(&sr, r, SHADOW, 1.0); |
397 |
|
} |
398 |
|
/* add contribution if hit */ |
399 |
|
addcolor(r->rcol, srccnt[cntord[sn].sno].val); |
400 |
< |
hit2 += hwt; |
400 |
> |
nhits++; |
401 |
|
source[cntord[sn].sno].nhits++; |
402 |
|
} |
403 |
< |
/* weighted hit rate */ |
404 |
< |
hwt = hit2 / test2; |
403 |
> |
/* surface hit rate */ |
404 |
> |
if (sn > 0) |
405 |
> |
hwt = (double)nhits / (double)sn; |
406 |
> |
else |
407 |
> |
hwt = 0.5; |
408 |
|
#ifdef DEBUG |
409 |
|
sprintf(errmsg, "%d tested, %d untested, %f hit rate\n", |
410 |
|
sn, ncnts-sn, hwt); |