| 100 |
|
register RAY *r; |
| 101 |
|
{ |
| 102 |
|
static int rdepth = 0; /* ambient recursion */ |
| 103 |
< |
double wsum; |
| 103 |
> |
double d; |
| 104 |
|
|
| 105 |
– |
rdepth++; /* increment level */ |
| 106 |
– |
|
| 105 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
| 106 |
|
goto dumbamb; |
| 107 |
|
/* check number of bounces */ |
| 108 |
< |
if (rdepth > ambounce) |
| 108 |
> |
if (rdepth >= ambounce) |
| 109 |
|
goto dumbamb; |
| 110 |
|
/* check ambient list */ |
| 111 |
|
if (ambincl != -1 && r->ro != NULL && |
| 113 |
|
goto dumbamb; |
| 114 |
|
|
| 115 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
| 116 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
| 116 |
> |
rdepth++; |
| 117 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 118 |
> |
rdepth--; |
| 119 |
> |
if (d == 0.0) |
| 120 |
|
goto dumbamb; |
| 121 |
< |
goto done; |
| 121 |
> |
return; |
| 122 |
|
} |
| 123 |
|
/* get ambient value */ |
| 124 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
| 125 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
| 126 |
< |
if (wsum > FTINY) |
| 127 |
< |
scalecolor(acol, 1.0/wsum); |
| 128 |
< |
else if (makeambient(acol, r) == 0.0) |
| 129 |
< |
goto dumbamb; |
| 130 |
< |
goto done; |
| 131 |
< |
|
| 125 |
> |
d = sumambient(acol, r, rdepth, |
| 126 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
| 127 |
> |
if (d > FTINY) |
| 128 |
> |
scalecolor(acol, 1.0/d); |
| 129 |
> |
else { |
| 130 |
> |
d = makeambient(acol, r, rdepth++); |
| 131 |
> |
rdepth--; |
| 132 |
> |
} |
| 133 |
> |
if (d > FTINY) |
| 134 |
> |
return; |
| 135 |
|
dumbamb: /* return global value */ |
| 136 |
|
copycolor(acol, ambval); |
| 133 |
– |
done: /* must finish here! */ |
| 134 |
– |
rdepth--; |
| 137 |
|
} |
| 138 |
|
|
| 139 |
|
|
| 140 |
|
double |
| 141 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
| 141 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
| 142 |
|
COLOR acol; |
| 143 |
|
register RAY *r; |
| 144 |
+ |
int al; |
| 145 |
|
AMBTREE *at; |
| 146 |
|
FVECT c0; |
| 147 |
|
double s; |
| 157 |
|
wsum = 0.0; |
| 158 |
|
for (av = at->alist; av != NULL; av = av->next) { |
| 159 |
|
/* |
| 160 |
< |
* Ray strength test. |
| 160 |
> |
* Ambient level test. |
| 161 |
|
*/ |
| 162 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
| 162 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
| 163 |
|
continue; |
| 164 |
|
/* |
| 165 |
|
* Ambient radius test. |
| 186 |
|
for (j = 0; j < 3; j++) |
| 187 |
|
d += (r->rop[j] - av->pos[j]) * |
| 188 |
|
(av->dir[j] + r->ron[j]); |
| 189 |
< |
if (d*0.5 < -minarad*ambacc) |
| 189 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
| 190 |
|
continue; |
| 191 |
|
/* |
| 192 |
|
* Jittering final test reduces image artifacts. |
| 200 |
|
else |
| 201 |
|
wt = 1.0 / wt; |
| 202 |
|
wsum += wt; |
| 203 |
< |
copycolor(ct, av->val); |
| 203 |
> |
extambient(ct, av, r->rop, r->ron); |
| 204 |
|
scalecolor(ct, wt); |
| 205 |
|
addcolor(acol, ct); |
| 206 |
|
} |
| 219 |
|
break; |
| 220 |
|
} |
| 221 |
|
if (j == 3) |
| 222 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
| 222 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
| 223 |
|
} |
| 224 |
|
return(wsum); |
| 225 |
|
} |
| 226 |
|
|
| 227 |
|
|
| 228 |
|
double |
| 229 |
< |
makeambient(acol, r) /* make a new ambient value */ |
| 229 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
| 230 |
|
COLOR acol; |
| 231 |
|
register RAY *r; |
| 232 |
+ |
int al; |
| 233 |
|
{ |
| 234 |
|
AMBVAL amb; |
| 235 |
|
FVECT gp, gd; |
| 236 |
< |
|
| 237 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
| 236 |
> |
/* compute weight */ |
| 237 |
> |
amb.weight = pow(AVGREFL, (double)al); |
| 238 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
| 239 |
> |
amb.weight = r->rweight; |
| 240 |
> |
/* compute ambient */ |
| 241 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 242 |
|
if (amb.rad == 0.0) |
| 243 |
|
return(0.0); |
| 244 |
|
/* store it */ |
| 245 |
|
VCOPY(amb.pos, r->rop); |
| 246 |
|
VCOPY(amb.dir, r->ron); |
| 247 |
< |
amb.lvl = r->rlvl; |
| 240 |
< |
amb.weight = r->rweight; |
| 247 |
> |
amb.lvl = al; |
| 248 |
|
copycolor(amb.val, acol); |
| 249 |
|
VCOPY(amb.gpos, gp); |
| 250 |
|
VCOPY(amb.gdir, gd); |
| 252 |
|
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 253 |
|
avsave(&amb); /* write to file */ |
| 254 |
|
return(amb.rad); |
| 255 |
+ |
} |
| 256 |
+ |
|
| 257 |
+ |
|
| 258 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 259 |
+ |
COLOR cr; |
| 260 |
+ |
register AMBVAL *ap; |
| 261 |
+ |
FVECT pv, nv; |
| 262 |
+ |
{ |
| 263 |
+ |
FVECT v1, v2; |
| 264 |
+ |
register int i; |
| 265 |
+ |
double d; |
| 266 |
+ |
|
| 267 |
+ |
d = 1.0; /* zeroeth order */ |
| 268 |
+ |
/* gradient due to translation */ |
| 269 |
+ |
for (i = 0; i < 3; i++) |
| 270 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 271 |
+ |
/* gradient due to rotation */ |
| 272 |
+ |
VCOPY(v1, ap->dir); |
| 273 |
+ |
fcross(v2, v1, nv); |
| 274 |
+ |
d += DOT(ap->gdir, v2); |
| 275 |
+ |
if (d <= 0.0) { |
| 276 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
| 277 |
+ |
return; |
| 278 |
+ |
} |
| 279 |
+ |
copycolor(cr, ap->val); |
| 280 |
+ |
scalecolor(cr, d); |
| 281 |
|
} |
| 282 |
|
|
| 283 |
|
|
