| 18 |
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|
| 19 |
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void |
| 20 |
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inithemi( /* initialize sampling hemisphere */ |
| 21 |
< |
register AMBHEMI *hp, |
| 21 |
> |
AMBHEMI *hp, |
| 22 |
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COLOR ac, |
| 23 |
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RAY *r, |
| 24 |
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double wt |
| 25 |
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) |
| 26 |
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{ |
| 27 |
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double d; |
| 28 |
< |
register int i; |
| 28 |
> |
int i; |
| 29 |
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/* set number of divisions */ |
| 30 |
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if (ambacc <= FTINY && |
| 31 |
< |
wt > (d = 0.8*bright(ac)*r->rweight/(ambdiv*minweight))) |
| 31 |
> |
wt > (d = 0.8*intens(ac)*r->rweight/(ambdiv*minweight))) |
| 32 |
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wt = d; /* avoid ray termination */ |
| 33 |
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hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
| 34 |
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i = ambacc > FTINY ? 3 : 1; /* minimum number of samples */ |
| 58 |
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|
| 59 |
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int |
| 60 |
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divsample( /* sample a division */ |
| 61 |
< |
register AMBSAMP *dp, |
| 61 |
> |
AMBSAMP *dp, |
| 62 |
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AMBHEMI *h, |
| 63 |
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RAY *r |
| 64 |
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) |
| 69 |
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double xd, yd, zd; |
| 70 |
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double b2; |
| 71 |
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double phi; |
| 72 |
< |
register int i; |
| 72 |
> |
int i; |
| 73 |
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/* ambient coefficient for weight */ |
| 74 |
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if (ambacc > FTINY) |
| 75 |
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setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
| 94 |
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ar.rdir[i] = xd*h->ux[i] + |
| 95 |
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yd*h->uy[i] + |
| 96 |
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zd*h->uz[i]; |
| 97 |
+ |
checknorm(ar.rdir); |
| 98 |
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dimlist[ndims++] = dp->t*h->np + dp->p + 90171; |
| 99 |
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rayvalue(&ar); |
| 100 |
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ndims--; |
| 139 |
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{ |
| 140 |
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const AMBSAMP *d1 = (const AMBSAMP *)p1; |
| 141 |
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const AMBSAMP *d2 = (const AMBSAMP *)p2; |
| 142 |
< |
register int c; |
| 142 |
> |
int c; |
| 143 |
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|
| 144 |
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if ( (c = d1->t - d2->t) ) |
| 145 |
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return(c); |
| 149 |
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|
| 150 |
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double |
| 151 |
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doambient( /* compute ambient component */ |
| 152 |
< |
COLOR acol, |
| 152 |
> |
COLOR rcol, |
| 153 |
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RAY *r, |
| 154 |
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double wt, |
| 155 |
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FVECT pg, |
| 156 |
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FVECT dg |
| 157 |
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) |
| 158 |
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{ |
| 159 |
< |
double b, d; |
| 159 |
> |
double b, d=0; |
| 160 |
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AMBHEMI hemi; |
| 161 |
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AMBSAMP *div; |
| 162 |
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AMBSAMP dnew; |
| 163 |
< |
register AMBSAMP *dp; |
| 163 |
> |
double acol[3]; |
| 164 |
> |
AMBSAMP *dp; |
| 165 |
|
double arad; |
| 166 |
< |
int ndivs; |
| 167 |
< |
register int i, j; |
| 166 |
> |
int divcnt; |
| 167 |
> |
int i, j; |
| 168 |
|
/* initialize hemisphere */ |
| 169 |
< |
inithemi(&hemi, acol, r, wt); |
| 170 |
< |
ndivs = hemi.nt * hemi.np; |
| 169 |
> |
inithemi(&hemi, rcol, r, wt); |
| 170 |
> |
divcnt = hemi.nt * hemi.np; |
| 171 |
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/* initialize */ |
| 172 |
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if (pg != NULL) |
| 173 |
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pg[0] = pg[1] = pg[2] = 0.0; |
| 174 |
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if (dg != NULL) |
| 175 |
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dg[0] = dg[1] = dg[2] = 0.0; |
| 176 |
< |
setcolor(acol, 0.0, 0.0, 0.0); |
| 177 |
< |
if (ndivs == 0) |
| 176 |
> |
setcolor(rcol, 0.0, 0.0, 0.0); |
| 177 |
> |
if (divcnt == 0) |
| 178 |
|
return(0.0); |
| 179 |
|
/* allocate super-samples */ |
| 180 |
|
if (hemi.ns > 0 || pg != NULL || dg != NULL) { |
| 181 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
| 181 |
> |
div = (AMBSAMP *)malloc(divcnt*sizeof(AMBSAMP)); |
| 182 |
|
if (div == NULL) |
| 183 |
|
error(SYSTEM, "out of memory in doambient"); |
| 184 |
|
} else |
| 185 |
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div = NULL; |
| 186 |
|
/* sample the divisions */ |
| 187 |
|
arad = 0.0; |
| 188 |
+ |
acol[0] = acol[1] = acol[2] = 0.0; |
| 189 |
|
if ((dp = div) == NULL) |
| 190 |
|
dp = &dnew; |
| 191 |
+ |
divcnt = 0; |
| 192 |
|
for (i = 0; i < hemi.nt; i++) |
| 193 |
|
for (j = 0; j < hemi.np; j++) { |
| 194 |
|
dp->t = i; dp->p = j; |
| 196 |
|
dp->r = 0.0; |
| 197 |
|
dp->n = 0; |
| 198 |
|
if (divsample(dp, &hemi, r) < 0) { |
| 199 |
< |
if (div == NULL) continue; |
| 200 |
< |
dp++; |
| 197 |
< |
hemi.ns = 0; /* incomplete sampling */ |
| 198 |
< |
pg = dg = NULL; |
| 199 |
> |
if (div != NULL) |
| 200 |
> |
dp++; |
| 201 |
|
continue; |
| 202 |
|
} |
| 203 |
|
arad += dp->r; |
| 204 |
+ |
divcnt++; |
| 205 |
|
if (div != NULL) |
| 206 |
|
dp++; |
| 207 |
|
else |
| 208 |
|
addcolor(acol, dp->v); |
| 209 |
|
} |
| 210 |
< |
if (hemi.ns > 0 && arad > FTINY && ndivs/arad < minarad) |
| 210 |
> |
if (!divcnt) { |
| 211 |
> |
if (div != NULL) |
| 212 |
> |
free((void *)div); |
| 213 |
> |
return(0.0); /* no samples taken */ |
| 214 |
> |
} |
| 215 |
> |
if (divcnt < hemi.nt*hemi.np) { |
| 216 |
> |
pg = dg = NULL; /* incomplete sampling */ |
| 217 |
> |
hemi.ns = 0; |
| 218 |
> |
} else if (arad > FTINY && divcnt/arad < minarad) { |
| 219 |
|
hemi.ns = 0; /* close enough */ |
| 220 |
< |
else if (hemi.ns > 0) { /* else perform super-sampling */ |
| 220 |
> |
} else if (hemi.ns > 0) { /* else perform super-sampling? */ |
| 221 |
|
comperrs(div, &hemi); /* compute errors */ |
| 222 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
| 222 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
| 223 |
|
/* super-sample */ |
| 224 |
|
for (i = hemi.ns; i > 0; i--) { |
| 225 |
|
dnew = *div; |
| 228 |
|
continue; |
| 229 |
|
} |
| 230 |
|
dp = div; /* reinsert */ |
| 231 |
< |
j = ndivs < i ? ndivs : i; |
| 231 |
> |
j = divcnt < i ? divcnt : i; |
| 232 |
|
while (--j > 0 && dnew.k < dp[1].k) { |
| 233 |
|
*dp = *(dp+1); |
| 234 |
|
dp++; |
| 236 |
|
*dp = dnew; |
| 237 |
|
} |
| 238 |
|
if (pg != NULL || dg != NULL) /* restore order */ |
| 239 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambnorm); |
| 239 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambnorm); |
| 240 |
|
} |
| 241 |
|
/* compute returned values */ |
| 242 |
|
if (div != NULL) { |
| 243 |
< |
arad = 0.0; |
| 244 |
< |
for (i = ndivs, dp = div; i-- > 0; dp++) { |
| 243 |
> |
arad = 0.0; /* note: divcnt may be < nt*np */ |
| 244 |
> |
for (i = hemi.nt*hemi.np, dp = div; i-- > 0; dp++) { |
| 245 |
|
arad += dp->r; |
| 246 |
|
if (dp->n > 1) { |
| 247 |
|
b = 1.0/dp->n; |
| 267 |
|
} |
| 268 |
|
free((void *)div); |
| 269 |
|
} |
| 270 |
+ |
copycolor(rcol, acol); |
| 271 |
|
if (arad <= FTINY) |
| 272 |
|
arad = maxarad; |
| 273 |
|
else |
| 274 |
< |
arad = (ndivs+hemi.ns)/arad; |
| 274 |
> |
arad = (divcnt+hemi.ns)/arad; |
| 275 |
|
if (pg != NULL) { /* reduce radius if gradient large */ |
| 276 |
|
d = DOT(pg,pg); |
| 277 |
|
if (d*arad*arad > 1.0) |
| 294 |
|
void |
| 295 |
|
comperrs( /* compute initial error estimates */ |
| 296 |
|
AMBSAMP *da, /* assumes standard ordering */ |
| 297 |
< |
register AMBHEMI *hp |
| 297 |
> |
AMBHEMI *hp |
| 298 |
|
) |
| 299 |
|
{ |
| 300 |
|
double b, b2; |
| 301 |
|
int i, j; |
| 302 |
< |
register AMBSAMP *dp; |
| 302 |
> |
AMBSAMP *dp; |
| 303 |
|
/* sum differences from neighbors */ |
| 304 |
|
dp = da; |
| 305 |
|
for (i = 0; i < hp->nt; i++) |
| 347 |
|
posgradient( /* compute position gradient */ |
| 348 |
|
FVECT gv, |
| 349 |
|
AMBSAMP *da, /* assumes standard ordering */ |
| 350 |
< |
register AMBHEMI *hp |
| 350 |
> |
AMBHEMI *hp |
| 351 |
|
) |
| 352 |
|
{ |
| 353 |
< |
register int i, j; |
| 353 |
> |
int i, j; |
| 354 |
|
double nextsine, lastsine, b, d; |
| 355 |
|
double mag0, mag1; |
| 356 |
|
double phi, cosp, sinp, xd, yd; |
| 357 |
< |
register AMBSAMP *dp; |
| 357 |
> |
AMBSAMP *dp; |
| 358 |
|
|
| 359 |
|
xd = yd = 0.0; |
| 360 |
|
for (j = 0; j < hp->np; j++) { |
| 405 |
|
dirgradient( /* compute direction gradient */ |
| 406 |
|
FVECT gv, |
| 407 |
|
AMBSAMP *da, /* assumes standard ordering */ |
| 408 |
< |
register AMBHEMI *hp |
| 408 |
> |
AMBHEMI *hp |
| 409 |
|
) |
| 410 |
|
{ |
| 411 |
< |
register int i, j; |
| 411 |
> |
int i, j; |
| 412 |
|
double mag; |
| 413 |
|
double phi, xd, yd; |
| 414 |
< |
register AMBSAMP *dp; |
| 414 |
> |
AMBSAMP *dp; |
| 415 |
|
|
| 416 |
|
xd = yd = 0.0; |
| 417 |
|
for (j = 0; j < hp->np; j++) { |
