| 109 |
|
setambacc(newa) /* set ambient accuracy */ |
| 110 |
|
double newa; |
| 111 |
|
{ |
| 112 |
< |
static double oldambacc = -1.0; |
| 112 |
> |
double ambdiff; |
| 113 |
|
|
| 114 |
< |
ambacc = newa < 0.0 ? 0.0 : newa; /* may be done already */ |
| 115 |
< |
if (oldambacc < -FTINY) |
| 116 |
< |
oldambacc = ambacc; /* do nothing first call */ |
| 117 |
< |
if (fabs(newa - oldambacc) < 0.01) |
| 118 |
< |
return; /* insignificant -- don't bother */ |
| 119 |
< |
if (ambacc <= FTINY) |
| 120 |
< |
return; /* cannot build new tree */ |
| 121 |
< |
/* else need to rebuild tree */ |
| 122 |
< |
sortambvals(1); |
| 123 |
< |
oldambacc = ambacc; /* remeber setting for next call */ |
| 114 |
> |
if (newa < 0.0) |
| 115 |
> |
newa = 0.0; |
| 116 |
> |
ambdiff = fabs(newa - ambacc); |
| 117 |
> |
if (ambdiff >= .01 && (ambacc = newa) > FTINY && nambvals > 0) |
| 118 |
> |
sortambvals(1); /* rebuild tree */ |
| 119 |
|
} |
| 120 |
|
|
| 121 |
|
|
| 176 |
|
} |
| 177 |
|
|
| 178 |
|
|
| 179 |
< |
ambient(acol, r) /* compute ambient component for ray */ |
| 179 |
> |
ambient(acol, r, nrm) /* compute ambient component for ray */ |
| 180 |
|
COLOR acol; |
| 181 |
|
register RAY *r; |
| 182 |
+ |
FVECT nrm; |
| 183 |
|
{ |
| 184 |
|
static int rdepth = 0; /* ambient recursion */ |
| 185 |
|
double d; |
| 206 |
|
sortambvals(0); |
| 207 |
|
/* get ambient value */ |
| 208 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
| 209 |
< |
d = sumambient(acol, r, rdepth, |
| 209 |
> |
d = sumambient(acol, r, nrm, rdepth, |
| 210 |
|
&atrunk, thescene.cuorg, thescene.cusize); |
| 211 |
|
if (d > FTINY) { |
| 212 |
|
scalecolor(acol, 1.0/d); |
| 213 |
|
return; |
| 214 |
|
} |
| 215 |
< |
rdepth++; |
| 216 |
< |
d = makeambient(acol, r, rdepth-1); |
| 215 |
> |
rdepth++; /* need to cache new value */ |
| 216 |
> |
d = makeambient(acol, r, nrm, rdepth-1); |
| 217 |
|
rdepth--; |
| 218 |
|
if (d > FTINY) |
| 219 |
|
return; |
| 231 |
|
|
| 232 |
|
|
| 233 |
|
double |
| 234 |
< |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
| 234 |
> |
sumambient(acol, r, rn, al, at, c0, s) /* get interpolated ambient value */ |
| 235 |
|
COLOR acol; |
| 236 |
|
register RAY *r; |
| 237 |
+ |
FVECT rn; |
| 238 |
|
int al; |
| 239 |
|
AMBTREE *at; |
| 240 |
|
FVECT c0; |
| 298 |
|
else |
| 299 |
|
wt = 1.0 / wt; |
| 300 |
|
wsum += wt; |
| 301 |
< |
extambient(ct, av, r->rop, r->ron); |
| 301 |
> |
extambient(ct, av, r->rop, rn); |
| 302 |
|
scalecolor(ct, wt); |
| 303 |
|
addcolor(acol, ct); |
| 304 |
|
} |
| 317 |
|
break; |
| 318 |
|
} |
| 319 |
|
if (j == 3) |
| 320 |
< |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
| 320 |
> |
wsum += sumambient(acol, r, rn, al, at->kid+i, ck0, s); |
| 321 |
|
} |
| 322 |
|
return(wsum); |
| 323 |
|
} |
| 324 |
|
|
| 325 |
|
|
| 326 |
|
double |
| 327 |
< |
makeambient(acol, r, al) /* make a new ambient value */ |
| 327 |
> |
makeambient(acol, r, rn, al) /* make a new ambient value */ |
| 328 |
|
COLOR acol; |
| 329 |
|
register RAY *r; |
| 330 |
+ |
FVECT rn; |
| 331 |
|
int al; |
| 332 |
|
{ |
| 333 |
|
AMBVAL amb; |
| 334 |
|
FVECT gp, gd; |
| 335 |
|
/* compute weight */ |
| 336 |
|
amb.weight = pow(AVGREFL, (double)al); |
| 337 |
< |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
| 337 |
> |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
| 338 |
|
amb.weight = r->rweight; |
| 339 |
|
/* compute ambient */ |
| 340 |
|
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 341 |
< |
if (amb.rad == 0.0) |
| 341 |
> |
if (amb.rad <= FTINY) |
| 342 |
|
return(0.0); |
| 343 |
|
/* store it */ |
| 344 |
|
VCOPY(amb.pos, r->rop); |
| 349 |
|
VCOPY(amb.gdir, gd); |
| 350 |
|
/* insert into tree */ |
| 351 |
|
avsave(&amb); /* and save to file */ |
| 352 |
+ |
if (rn != r->ron) |
| 353 |
+ |
extambient(acol, &amb, r->rop, rn); /* texture */ |
| 354 |
|
return(amb.rad); |
| 355 |
|
} |
| 356 |
|
|
