| 254 |
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| 255 |
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| 256 |
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extern void |
| 257 |
< |
ambient( /* compute ambient component for ray */ |
| 258 |
< |
COLOR acol, |
| 257 |
> |
multambient( /* compute ambient component & multiply by coef. */ |
| 258 |
> |
COLOR aval, |
| 259 |
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register RAY *r, |
| 260 |
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FVECT nrm |
| 261 |
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) |
| 262 |
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{ |
| 263 |
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static int rdepth = 0; /* ambient recursion */ |
| 264 |
+ |
COLOR acol; |
| 265 |
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double d, l; |
| 266 |
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| 267 |
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if (ambdiv <= 0) /* no ambient calculation */ |
| 276 |
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| 277 |
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if (ambacc <= FTINY) { /* no ambient storage */ |
| 278 |
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rdepth++; |
| 279 |
< |
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 279 |
> |
d = doambient(acol, r, aval, intens(aval)*r->rweight, |
| 280 |
> |
NULL, NULL); |
| 281 |
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rdepth--; |
| 282 |
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if (d <= FTINY) |
| 283 |
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goto dumbamb; |
| 284 |
+ |
multcolor(aval, acol); |
| 285 |
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return; |
| 286 |
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} |
| 287 |
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|
| 293 |
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&atrunk, thescene.cuorg, thescene.cusize); |
| 294 |
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if (d > FTINY) { |
| 295 |
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scalecolor(acol, 1.0/d); |
| 296 |
+ |
multcolor(aval, acol); |
| 297 |
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return; |
| 298 |
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} |
| 299 |
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rdepth++; /* need to cache new value */ |
| 300 |
< |
d = makeambient(acol, r, nrm, rdepth-1); |
| 300 |
> |
d = makeambient(acol, r, aval, nrm, rdepth-1); |
| 301 |
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rdepth--; |
| 302 |
< |
if (d > FTINY) |
| 302 |
> |
if (d > FTINY) { |
| 303 |
> |
multcolor(aval, acol); /* got new value */ |
| 304 |
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return; |
| 305 |
+ |
} |
| 306 |
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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 |
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return; |
| 310 |
+ |
} |
| 311 |
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l = bright(ambval); /* average in computations */ |
| 312 |
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if (l > FTINY) { |
| 313 |
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d = (log(l)*(double)ambvwt + avsum) / |
| 314 |
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(double)(ambvwt + navsum); |
| 315 |
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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 |
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} else { |
| 319 |
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d = exp( avsum / (double)navsum ); |
| 320 |
< |
setcolor(acol, d, d, d); /* neutral color */ |
| 320 |
> |
scalecolor(aval, d); /* neutral color */ |
| 321 |
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} |
| 322 |
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} |
| 323 |
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|
| 439 |
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extern double |
| 440 |
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makeambient( /* make a new ambient value */ |
| 441 |
|
COLOR acol, |
| 442 |
< |
register RAY *r, |
| 442 |
> |
RAY *r, |
| 443 |
> |
COLOR ac, |
| 444 |
|
FVECT rn, |
| 445 |
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int al |
| 446 |
|
) |
| 447 |
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{ |
| 448 |
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AMBVAL amb; |
| 449 |
+ |
double coef; |
| 450 |
|
FVECT gp, gd; |
| 451 |
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/* compute weight */ |
| 452 |
|
amb.weight = pow(AVGREFL, (double)al); |
| 453 |
< |
if (r->rweight < 0.1*amb.weight) /* heuristic */ |
| 454 |
< |
amb.weight = r->rweight; |
| 453 |
> |
coef = intens(ac)*r->rweight; |
| 454 |
> |
if (coef < 0.1*amb.weight) /* heuristic */ |
| 455 |
> |
amb.weight = coef; |
| 456 |
|
/* compute ambient */ |
| 457 |
< |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 457 |
> |
amb.rad = doambient(acol, r, ac, amb.weight, gp, gd); |
| 458 |
|
if (amb.rad <= FTINY) |
| 459 |
|
return(0.0); |
| 460 |
|
/* store it */ |
