| 22 |
|
|
| 23 |
|
extern double ssampdist; /* scatter sampling distance */ |
| 24 |
|
|
| 25 |
+ |
#ifndef MAXSSAMP |
| 26 |
+ |
#define MAXSSAMP 16 /* maximum samples per ray */ |
| 27 |
+ |
#endif |
| 28 |
+ |
|
| 29 |
|
/* |
| 30 |
|
* Structures used by direct() |
| 31 |
|
*/ |
| 337 |
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( sr.ro != source[scp->sno].so || |
| 338 |
|
source[scp->sno].sflags & SFOLLOW )) { |
| 339 |
|
/* follow entire path */ |
| 340 |
< |
if (!raycont(&sr)) |
| 337 |
< |
objerror(sr.ro, USER, "material not found"); |
| 340 |
> |
raycont(&sr); |
| 341 |
|
rayparticipate(&sr); |
| 342 |
|
if (trace != NULL) |
| 343 |
|
(*trace)(&sr); /* trace execution */ |
| 385 |
|
COLOR cumval, ctmp; |
| 386 |
|
int i, j; |
| 387 |
|
|
| 388 |
< |
if (r->slights == NULL || r->slights[0] == 0 || r->gecc >= 1.-FTINY) |
| 388 |
> |
if (r->slights == NULL || r->slights[0] == 0 |
| 389 |
> |
|| r->gecc >= 1.-FTINY || r->rot >= FHUGE) |
| 390 |
|
return; |
| 391 |
|
if (ssampdist <= FTINY || (nsamps = r->rot/ssampdist + .5) < 1) |
| 392 |
|
nsamps = 1; |
| 393 |
+ |
#if MAXSSAMP |
| 394 |
+ |
else if (nsamps > MAXSSAMP) |
| 395 |
+ |
nsamps = MAXSSAMP; |
| 396 |
+ |
#endif |
| 397 |
|
oldsampndx = samplendx; |
| 398 |
|
samplendx = random()&0x7fff; /* randomize */ |
| 399 |
|
for (i = r->slights[0]; i > 0; i--) { /* for each source */ |
| 413 |
|
sr.rsrc != r->slights[i]) |
| 414 |
|
continue; /* no path */ |
| 415 |
|
copycolor(sr.cext, r->cext); |
| 416 |
< |
sr.albedo = r->albedo; |
| 416 |
> |
copycolor(sr.albedo, r->albedo); |
| 417 |
|
sr.gecc = r->gecc; |
| 418 |
|
rayvalue(&sr); /* eval. source ray */ |
| 419 |
|
if (bright(sr.rcol) <= FTINY) |
| 433 |
|
d = (1. - r->gecc*r->gecc) / (d*d*d); |
| 434 |
|
} |
| 435 |
|
/* other factors */ |
| 436 |
< |
d *= si.dom * r->albedo * r->rot / (4.*PI*nsamps); |
| 436 |
> |
d *= si.dom * r->rot / (4.*PI*nsamps); |
| 437 |
|
multcolor(sr.rcol, r->cext); |
| 438 |
+ |
multcolor(sr.rcol, r->albedo); |
| 439 |
|
scalecolor(sr.rcol, d); |
| 440 |
|
addcolor(cumval, sr.rcol); |
| 441 |
|
} |