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#ifndef OCTSCALE |
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#define OCTSCALE 1.0 /* ceil((valid rad.)/(cube size)) */ |
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#endif |
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– |
#ifndef AMBVWT |
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#define AMBVWT 250 /* relative ambient value weight (# calcs) */ |
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#endif |
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typedef struct ambtree { |
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AMBVAL *alist; /* ambient value list */ |
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#endif |
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static COLOR avsum = BLKCOLOR; /* computed ambient value sum */ |
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< |
static unsigned int nambvals = 0; /* number of computed ambient values */ |
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> |
static unsigned int nambvals = 0; /* total number of indirect values */ |
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static unsigned int nambshare = 0; /* number of values from file */ |
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static unsigned long ambclock = 0; /* ambient access clock */ |
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static unsigned long lastsort = 0; /* time of last value sort */ |
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static long sortintvl = SORT_INTVL; /* time until next sort */ |
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/* |
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* Track access times unless we are sharing ambient values |
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* through memory on a multiprocessor, when we want to avoid |
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* claiming our own memory (copy on write). |
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> |
* claiming our own memory (copy on write). Go ahead anyway |
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* if more than two thirds of our values are unshared. |
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*/ |
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< |
#define tracktime (shm_boundary == NULL || ambfp == NULL) |
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> |
#define tracktime (shm_boundary == NULL || nambvals > 3*nambshare) |
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#define AMBFLUSH (BUFSIZ/AMBVALSIZ) |
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setambacc(newa) /* set ambient accuracy */ |
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double newa; |
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{ |
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static double oldambacc = -1.0; |
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> |
double ambdiff; |
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|
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< |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
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< |
if (oldambacc < -FTINY) |
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< |
oldambacc = ambacc; /* do nothing first call */ |
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< |
if (fabs(newa - oldambacc) < 0.01) |
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return; /* insignificant -- don't bother */ |
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if (ambacc <= FTINY) |
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< |
return; /* cannot build new tree */ |
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< |
/* else need to rebuild tree */ |
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< |
sortambvals(1); |
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< |
oldambacc = ambacc; /* remeber setting for next call */ |
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> |
if (newa < 0.0) |
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> |
newa = 0.0; |
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> |
ambdiff = fabs(newa - ambacc); |
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> |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
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> |
sortambvals(1); /* rebuild tree */ |
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} |
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avinsert(avstore(&amb)); |
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/* align */ |
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fseek(ambfp, -((ftell(ambfp)-headlen)%AMBVALSIZ), 1); |
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+ |
nambshare = nambvals; |
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} else if ((ambfp = fopen(afile, "w+")) != NULL) |
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initambfile(1); |
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else { |
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} |
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< |
ambient(acol, r) /* compute ambient component for ray */ |
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> |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
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COLOR acol; |
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register RAY *r; |
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+ |
FVECT nrm; |
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{ |
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static int rdepth = 0; /* ambient recursion */ |
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double d; |
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sortambvals(0); |
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/* get ambient value */ |
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setcolor(acol, 0.0, 0.0, 0.0); |
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< |
d = sumambient(acol, r, rdepth, |
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> |
d = sumambient(acol, r, nrm, rdepth, |
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&atrunk, thescene.cuorg, thescene.cusize); |
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if (d > FTINY) { |
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scalecolor(acol, 1.0/d); |
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return; |
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} |
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< |
rdepth++; |
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< |
d = makeambient(acol, r, rdepth-1); |
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> |
rdepth++; /* need to cache new value */ |
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> |
d = makeambient(acol, r, nrm, rdepth-1); |
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rdepth--; |
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if (d > FTINY) |
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return; |
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dumbamb: /* return global value */ |
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copycolor(acol, ambval); |
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< |
#if AMBVWT |
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< |
if (nambvals == 0) |
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> |
if (ambvwt <= 0 | nambvals == 0) |
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return; |
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< |
scalecolor(acol, (double)AMBVWT); |
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> |
scalecolor(acol, (double)ambvwt); |
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addcolor(acol, avsum); /* average in computations */ |
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< |
d = 1.0/(AMBVWT+nambvals); |
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> |
d = 1.0/(ambvwt+nambvals); |
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scalecolor(acol, d); |
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– |
#endif |
| 228 |
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} |
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|
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|
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double |
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< |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
| 232 |
> |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
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COLOR acol; |
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register RAY *r; |
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+ |
FVECT rn; |
| 236 |
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int al; |
| 237 |
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AMBTREE *at; |
| 238 |
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FVECT c0; |
| 296 |
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else |
| 297 |
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wt = 1.0 / wt; |
| 298 |
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wsum += wt; |
| 299 |
< |
extambient(ct, av, r->rop, r->ron); |
| 299 |
> |
extambient(ct, av, r->rop, rn); |
| 300 |
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scalecolor(ct, wt); |
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addcolor(acol, ct); |
| 302 |
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} |
| 315 |
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break; |
| 316 |
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} |
| 317 |
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if (j == 3) |
| 318 |
< |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
| 318 |
> |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
| 319 |
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} |
| 320 |
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return(wsum); |
| 321 |
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} |
| 322 |
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|
| 323 |
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|
| 324 |
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double |
| 325 |
< |
makeambient(acol, r, al) /* make a new ambient value */ |
| 325 |
> |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
| 326 |
|
COLOR acol; |
| 327 |
|
register RAY *r; |
| 328 |
+ |
FVECT rn; |
| 329 |
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int al; |
| 330 |
|
{ |
| 331 |
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AMBVAL amb; |
| 332 |
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FVECT gp, gd; |
| 333 |
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/* compute weight */ |
| 334 |
|
amb.weight = pow(AVGREFL, (double)al); |
| 335 |
< |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
| 335 |
> |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
| 336 |
|
amb.weight = r->rweight; |
| 337 |
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/* compute ambient */ |
| 338 |
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 339 |
< |
if (amb.rad == 0.0) |
| 339 |
> |
if (amb.rad <= FTINY) |
| 340 |
|
return(0.0); |
| 341 |
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/* store it */ |
| 342 |
|
VCOPY(amb.pos, r->rop); |
| 347 |
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VCOPY(amb.gdir, gd); |
| 348 |
|
/* insert into tree */ |
| 349 |
|
avsave(&amb); /* and save to file */ |
| 350 |
+ |
if (rn != r->ron) |
| 351 |
+ |
extambient(acol, &amb, r->rop, rn); /* texture */ |
| 352 |
|
return(amb.rad); |
| 353 |
|
} |
| 354 |
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|
