| 47 |
|
#define newambtree() (AMBTREE *)calloc(8, sizeof(AMBTREE)) |
| 48 |
|
|
| 49 |
|
|
| 50 |
+ |
setambres(ar) /* set ambient resolution */ |
| 51 |
+ |
int ar; |
| 52 |
+ |
{ |
| 53 |
+ |
/* set min & max radii */ |
| 54 |
+ |
if (ar <= 0) { |
| 55 |
+ |
minarad = 0.0; |
| 56 |
+ |
maxarad = thescene.cusize / 2.0; |
| 57 |
+ |
} else { |
| 58 |
+ |
minarad = thescene.cusize / ar; |
| 59 |
+ |
maxarad = 16.0 * minarad; /* heuristic */ |
| 60 |
+ |
if (maxarad > thescene.cusize / 2.0) |
| 61 |
+ |
maxarad = thescene.cusize / 2.0; |
| 62 |
+ |
} |
| 63 |
+ |
} |
| 64 |
+ |
|
| 65 |
+ |
|
| 66 |
|
setambient(afile) /* initialize calculation */ |
| 67 |
|
char *afile; |
| 68 |
|
{ |
| 69 |
|
long ftell(); |
| 70 |
|
AMBVAL amb; |
| 71 |
< |
|
| 72 |
< |
maxarad = thescene.cusize / 2.0; /* maximum radius */ |
| 73 |
< |
/* minimum radius */ |
| 58 |
< |
minarad = ambres > 0 ? thescene.cusize/ambres : 0.0; |
| 59 |
< |
|
| 60 |
< |
/* open ambient file */ |
| 71 |
> |
/* init ambient limits */ |
| 72 |
> |
setambres(ambres); |
| 73 |
> |
/* open ambient file */ |
| 74 |
|
if (afile != NULL) |
| 75 |
|
if ((ambfp = fopen(afile, "r+")) != NULL) { |
| 76 |
|
while (fread((char *)&amb,sizeof(AMBVAL),1,ambfp) == 1) |
| 113 |
|
register RAY *r; |
| 114 |
|
{ |
| 115 |
|
static int rdepth = 0; /* ambient recursion */ |
| 116 |
< |
double wsum; |
| 116 |
> |
double d; |
| 117 |
|
|
| 105 |
– |
rdepth++; /* increment level */ |
| 106 |
– |
|
| 118 |
|
if (ambdiv <= 0) /* no ambient calculation */ |
| 119 |
|
goto dumbamb; |
| 120 |
|
/* check number of bounces */ |
| 121 |
< |
if (rdepth > ambounce) |
| 121 |
> |
if (rdepth >= ambounce) |
| 122 |
|
goto dumbamb; |
| 123 |
|
/* check ambient list */ |
| 124 |
|
if (ambincl != -1 && r->ro != NULL && |
| 126 |
|
goto dumbamb; |
| 127 |
|
|
| 128 |
|
if (ambacc <= FTINY) { /* no ambient storage */ |
| 129 |
< |
if (doambient(acol, r, NULL, NULL) == 0.0) |
| 129 |
> |
rdepth++; |
| 130 |
> |
d = doambient(acol, r, r->rweight, NULL, NULL); |
| 131 |
> |
rdepth--; |
| 132 |
> |
if (d == 0.0) |
| 133 |
|
goto dumbamb; |
| 134 |
< |
goto done; |
| 134 |
> |
return; |
| 135 |
|
} |
| 136 |
|
/* get ambient value */ |
| 137 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
| 138 |
< |
wsum = sumambient(acol, r, &atrunk, thescene.cuorg, thescene.cusize); |
| 139 |
< |
if (wsum > FTINY) |
| 140 |
< |
scalecolor(acol, 1.0/wsum); |
| 141 |
< |
else if (makeambient(acol, r) == 0.0) |
| 142 |
< |
goto dumbamb; |
| 143 |
< |
goto done; |
| 144 |
< |
|
| 138 |
> |
d = sumambient(acol, r, rdepth, |
| 139 |
> |
&atrunk, thescene.cuorg, thescene.cusize); |
| 140 |
> |
if (d > FTINY) |
| 141 |
> |
scalecolor(acol, 1.0/d); |
| 142 |
> |
else { |
| 143 |
> |
d = makeambient(acol, r, rdepth++); |
| 144 |
> |
rdepth--; |
| 145 |
> |
} |
| 146 |
> |
if (d > FTINY) |
| 147 |
> |
return; |
| 148 |
|
dumbamb: /* return global value */ |
| 149 |
|
copycolor(acol, ambval); |
| 133 |
– |
done: /* must finish here! */ |
| 134 |
– |
rdepth--; |
| 150 |
|
} |
| 151 |
|
|
| 152 |
|
|
| 153 |
|
double |
| 154 |
< |
sumambient(acol, r, at, c0, s) /* get interpolated ambient value */ |
| 154 |
> |
sumambient(acol, r, al, at, c0, s) /* get interpolated ambient value */ |
| 155 |
|
COLOR acol; |
| 156 |
|
register RAY *r; |
| 157 |
+ |
int al; |
| 158 |
|
AMBTREE *at; |
| 159 |
|
FVECT c0; |
| 160 |
|
double s; |
| 170 |
|
wsum = 0.0; |
| 171 |
|
for (av = at->alist; av != NULL; av = av->next) { |
| 172 |
|
/* |
| 173 |
< |
* Ray strength test. |
| 173 |
> |
* Ambient level test. |
| 174 |
|
*/ |
| 175 |
< |
if (av->lvl > r->rlvl || av->weight < r->rweight-FTINY) |
| 175 |
> |
if (av->lvl > al || av->weight < r->rweight-FTINY) |
| 176 |
|
continue; |
| 177 |
|
/* |
| 178 |
|
* Ambient radius test. |
| 199 |
|
for (j = 0; j < 3; j++) |
| 200 |
|
d += (r->rop[j] - av->pos[j]) * |
| 201 |
|
(av->dir[j] + r->ron[j]); |
| 202 |
< |
if (d*0.5 < -minarad*ambacc) |
| 202 |
> |
if (d*0.5 < -minarad*ambacc-.001) |
| 203 |
|
continue; |
| 204 |
|
/* |
| 205 |
|
* Jittering final test reduces image artifacts. |
| 206 |
|
*/ |
| 207 |
|
wt = sqrt(e1) + sqrt(e2); |
| 208 |
< |
wt *= .9 + .2*frandom(); |
| 208 |
> |
wt *= .9 + .2*urand(9015+samplendx); |
| 209 |
|
if (wt > ambacc) |
| 210 |
|
continue; |
| 211 |
|
if (wt <= 1e-3) |
| 213 |
|
else |
| 214 |
|
wt = 1.0 / wt; |
| 215 |
|
wsum += wt; |
| 216 |
< |
copycolor(ct, av->val); |
| 216 |
> |
extambient(ct, av, r->rop, r->ron); |
| 217 |
|
scalecolor(ct, wt); |
| 218 |
|
addcolor(acol, ct); |
| 219 |
|
} |
| 232 |
|
break; |
| 233 |
|
} |
| 234 |
|
if (j == 3) |
| 235 |
< |
wsum += sumambient(acol, r, at->kid+i, ck0, s); |
| 235 |
> |
wsum += sumambient(acol, r, al, at->kid+i, ck0, s); |
| 236 |
|
} |
| 237 |
|
return(wsum); |
| 238 |
|
} |
| 239 |
|
|
| 240 |
|
|
| 241 |
|
double |
| 242 |
< |
makeambient(acol, r) /* make a new ambient value */ |
| 242 |
> |
makeambient(acol, r, al) /* make a new ambient value */ |
| 243 |
|
COLOR acol; |
| 244 |
|
register RAY *r; |
| 245 |
+ |
int al; |
| 246 |
|
{ |
| 247 |
|
AMBVAL amb; |
| 248 |
|
FVECT gp, gd; |
| 249 |
< |
|
| 250 |
< |
amb.rad = doambient(acol, r, gp, gd); /* compute ambient */ |
| 249 |
> |
/* compute weight */ |
| 250 |
> |
amb.weight = pow(AVGREFL, (double)al); |
| 251 |
> |
if (r->rweight < 0.2*amb.weight) /* heuristic */ |
| 252 |
> |
amb.weight = r->rweight; |
| 253 |
> |
/* compute ambient */ |
| 254 |
> |
amb.rad = doambient(acol, r, amb.weight, gp, gd); |
| 255 |
|
if (amb.rad == 0.0) |
| 256 |
|
return(0.0); |
| 257 |
|
/* store it */ |
| 258 |
|
VCOPY(amb.pos, r->rop); |
| 259 |
|
VCOPY(amb.dir, r->ron); |
| 260 |
< |
amb.lvl = r->rlvl; |
| 240 |
< |
amb.weight = r->rweight; |
| 260 |
> |
amb.lvl = al; |
| 261 |
|
copycolor(amb.val, acol); |
| 262 |
|
VCOPY(amb.gpos, gp); |
| 263 |
|
VCOPY(amb.gdir, gd); |
| 265 |
|
avinsert(&amb, &atrunk, thescene.cuorg, thescene.cusize); |
| 266 |
|
avsave(&amb); /* write to file */ |
| 267 |
|
return(amb.rad); |
| 268 |
+ |
} |
| 269 |
+ |
|
| 270 |
+ |
|
| 271 |
+ |
extambient(cr, ap, pv, nv) /* extrapolate value at pv, nv */ |
| 272 |
+ |
COLOR cr; |
| 273 |
+ |
register AMBVAL *ap; |
| 274 |
+ |
FVECT pv, nv; |
| 275 |
+ |
{ |
| 276 |
+ |
FVECT v1, v2; |
| 277 |
+ |
register int i; |
| 278 |
+ |
double d; |
| 279 |
+ |
|
| 280 |
+ |
d = 1.0; /* zeroeth order */ |
| 281 |
+ |
/* gradient due to translation */ |
| 282 |
+ |
for (i = 0; i < 3; i++) |
| 283 |
+ |
d += ap->gpos[i]*(pv[i]-ap->pos[i]); |
| 284 |
+ |
/* gradient due to rotation */ |
| 285 |
+ |
VCOPY(v1, ap->dir); |
| 286 |
+ |
fcross(v2, v1, nv); |
| 287 |
+ |
d += DOT(ap->gdir, v2); |
| 288 |
+ |
if (d <= 0.0) { |
| 289 |
+ |
setcolor(cr, 0.0, 0.0, 0.0); |
| 290 |
+ |
return; |
| 291 |
+ |
} |
| 292 |
+ |
copycolor(cr, ap->val); |
| 293 |
+ |
scalecolor(cr, d); |
| 294 |
|
} |
| 295 |
|
|
| 296 |
|
|
