| 192 |
|
sprintf(errmsg, "cannot open ambient file \"%s\"", ambfile); |
| 193 |
|
error(SYSTEM, errmsg); |
| 194 |
|
} |
| 195 |
< |
nunflshed++; /* lie */ |
| 196 |
< |
ambsync(); |
| 195 |
> |
ambsync(); /* load previous values */ |
| 196 |
|
} |
| 197 |
|
|
| 198 |
|
|
| 253 |
|
|
| 254 |
|
|
| 255 |
|
extern void |
| 256 |
< |
ambient( /* compute ambient component for ray */ |
| 257 |
< |
COLOR acol, |
| 256 |
> |
multambient( /* compute ambient component & multiply by coef. */ |
| 257 |
> |
COLOR aval, |
| 258 |
|
register RAY *r, |
| 259 |
|
FVECT nrm |
| 260 |
|
) |
| 261 |
|
{ |
| 262 |
|
static int rdepth = 0; /* ambient recursion */ |
| 263 |
+ |
COLOR acol; |
| 264 |
|
double d, l; |
| 265 |
|
|
| 266 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
| 274 |
|
goto dumbamb; |
| 275 |
|
|
| 276 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
| 277 |
+ |
copycolor(acol, aval); |
| 278 |
|
rdepth++; |
| 279 |
|
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 280 |
|
rdepth--; |
| 281 |
|
if (d <= FTINY) |
| 282 |
|
goto dumbamb; |
| 283 |
+ |
copycolor(aval, acol); |
| 284 |
|
return; |
| 285 |
|
} |
| 286 |
|
|
| 287 |
|
if (tracktime) /* sort to minimize thrashing */ |
| 288 |
|
sortambvals(0); |
| 289 |
< |
/* get ambient value */ |
| 289 |
> |
/* interpolate ambient value */ |
| 290 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
| 291 |
|
d = sumambient(acol, r, nrm, rdepth, |
| 292 |
|
&atrunk, thescene.cuorg, thescene.cusize); |
| 293 |
|
if (d > FTINY) { |
| 294 |
< |
scalecolor(acol, 1.0/d); |
| 294 |
> |
d = 1.0/d; |
| 295 |
> |
scalecolor(acol, d); |
| 296 |
> |
multcolor(aval, acol); |
| 297 |
|
return; |
| 298 |
|
} |
| 299 |
|
rdepth++; /* need to cache new value */ |
| 300 |
|
d = makeambient(acol, r, nrm, rdepth-1); |
| 301 |
|
rdepth--; |
| 302 |
< |
if (d > FTINY) |
| 302 |
> |
if (d > FTINY) { |
| 303 |
> |
multcolor(aval, acol); /* got new value */ |
| 304 |
|
return; |
| 305 |
+ |
} |
| 306 |
|
dumbamb: /* return global value */ |
| 307 |
< |
copycolor(acol, ambval); |
| 308 |
< |
if ((ambvwt <= 0) | (navsum == 0)) |
| 307 |
> |
if ((ambvwt <= 0) | (navsum == 0)) { |
| 308 |
> |
multcolor(aval, ambval); |
| 309 |
|
return; |
| 310 |
+ |
} |
| 311 |
|
l = bright(ambval); /* average in computations */ |
| 312 |
|
if (l > FTINY) { |
| 313 |
|
d = (log(l)*(double)ambvwt + avsum) / |
| 314 |
|
(double)(ambvwt + navsum); |
| 315 |
|
d = exp(d) / l; |
| 316 |
< |
scalecolor(acol, d); /* apply color of ambval */ |
| 316 |
> |
scalecolor(aval, d); |
| 317 |
> |
multcolor(aval, ambval); /* apply color of ambval */ |
| 318 |
|
} else { |
| 319 |
|
d = exp( avsum / (double)navsum ); |
| 320 |
< |
setcolor(acol, d, d, d); /* neutral color */ |
| 320 |
> |
scalecolor(aval, d); /* neutral color */ |
| 321 |
|
} |
| 322 |
|
} |
| 323 |
|
|
| 351 |
|
*/ |
| 352 |
|
if (av->lvl > al) /* list sorted, so this works */ |
| 353 |
|
break; |
| 354 |
< |
if (av->weight < r->rweight-FTINY) |
| 354 |
> |
if (av->weight < 0.9*r->rweight) |
| 355 |
|
continue; |
| 356 |
|
/* |
| 357 |
|
* Ambient radius test. |
| 430 |
|
break; |
| 431 |
|
} |
| 432 |
|
if (j == 3) |
| 433 |
< |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
| 433 |
> |
wsum += sumambient(acol, r, rn, al, |
| 434 |
> |
at->kid+i, ck0, s); |
| 435 |
|
} |
| 436 |
|
return(wsum); |
| 437 |
|
} |
| 438 |
|
|
| 439 |
|
|
| 440 |
|
extern double |
| 441 |
< |
makeambient( /* make a new ambient value */ |
| 441 |
> |
makeambient( /* make a new ambient value for storage */ |
| 442 |
|
COLOR acol, |
| 443 |
< |
register RAY *r, |
| 443 |
> |
RAY *r, |
| 444 |
|
FVECT rn, |
| 445 |
|
int al |
| 446 |
|
) |
| 447 |
|
{ |
| 448 |
|
AMBVAL amb; |
| 449 |
|
FVECT gp, gd; |
| 450 |
< |
/* compute weight */ |
| 451 |
< |
amb.weight = pow(AVGREFL, (double)al); |
| 452 |
< |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
| 453 |
< |
amb.weight = r->rweight; |
| 450 |
> |
int i; |
| 451 |
> |
|
| 452 |
> |
amb.weight = 1.0; /* compute weight */ |
| 453 |
> |
for (i = al; i-- > 0; ) |
| 454 |
> |
amb.weight *= AVGREFL; |
| 455 |
> |
if (r->rweight < 0.1*amb.weight) /* heuristic override */ |
| 456 |
> |
amb.weight = 1.25*r->rweight; |
| 457 |
> |
setcolor(acol, AVGREFL, AVGREFL, AVGREFL); |
| 458 |
|
/* compute ambient */ |
| 459 |
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 460 |
< |
if (amb.rad <= FTINY) |
| 460 |
> |
if (amb.rad <= FTINY) { |
| 461 |
> |
setcolor(acol, 0.0, 0.0, 0.0); |
| 462 |
|
return(0.0); |
| 463 |
< |
/* store it */ |
| 463 |
> |
} |
| 464 |
> |
scalecolor(acol, 1./AVGREFL); /* undo assumed reflectance */ |
| 465 |
> |
/* store value */ |
| 466 |
|
VCOPY(amb.pos, r->rop); |
| 467 |
|
VCOPY(amb.dir, r->ron); |
| 468 |
|
amb.lvl = al; |
| 876 |
|
AMBVAL avs; |
| 877 |
|
register int n; |
| 878 |
|
|
| 863 |
– |
if (nunflshed == 0) |
| 864 |
– |
return(0); |
| 879 |
|
if (lastpos < 0) /* initializing (locked in initambfile) */ |
| 880 |
|
goto syncend; |
| 881 |
< |
/* gain exclusive access */ |
| 882 |
< |
aflock(F_WRLCK); |
| 881 |
> |
/* gain appropriate access */ |
| 882 |
> |
aflock(nunflshed ? F_WRLCK : F_RDLCK); |
| 883 |
|
/* see if file has grown */ |
| 884 |
|
if ((flen = lseek(fileno(ambfp), (off_t)0, SEEK_END)) < 0) |
| 885 |
|
goto seekerr; |
| 932 |
|
extern int |
| 933 |
|
ambsync(void) /* flush ambient file */ |
| 934 |
|
{ |
| 921 |
– |
if (nunflshed == 0) |
| 922 |
– |
return(0); |
| 935 |
|
nunflshed = 0; |
| 936 |
|
return(fflush(ambfp)); |
| 937 |
|
} |
