| 197 |
|
else |
| 198 |
|
wt = 1.0 / wt; |
| 199 |
|
wsum += wt; |
| 200 |
< |
copycolor(ct, av->val); |
| 200 |
> |
extambient(ct, av, r->rop, r->ron); |
| 201 |
|
scalecolor(ct, wt); |
| 202 |
|
addcolor(acol, ct); |
| 203 |
|
} |
| 245 |
|
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 246 |
|
avsave(&amb); /* write to file */ |
| 247 |
|
return(amb.rad); |
| 248 |
+ |
} |
| 249 |
+ |
|
| 250 |
+ |
|
| 251 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 252 |
+ |
COLOR cr; |
| 253 |
+ |
register AMBVAL *ap; |
| 254 |
+ |
FVECT pv, nv; |
| 255 |
+ |
{ |
| 256 |
+ |
FVECT v1, v2; |
| 257 |
+ |
register int i; |
| 258 |
+ |
double d; |
| 259 |
+ |
|
| 260 |
+ |
d = 1.0; /* zeroeth order */ |
| 261 |
+ |
/* gradient due to translation */ |
| 262 |
+ |
for (i = 0; i < 3; i++) |
| 263 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 264 |
+ |
/* gradient due to rotation */ |
| 265 |
+ |
VCOPY(v1, ap->dir); |
| 266 |
+ |
fcross(v2, v1, nv); |
| 267 |
+ |
d += DOT(ap->gdir, v2); |
| 268 |
+ |
if (d <= 0.0) { |
| 269 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
| 270 |
+ |
return; |
| 271 |
+ |
} |
| 272 |
+ |
copycolor(cr, ap->val); |
| 273 |
+ |
scalecolor(cr, d); |
| 274 |
|
} |
| 275 |
|
|
| 276 |
|
|
