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#include "random.h" |
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|
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|
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< |
int |
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> |
void |
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inithemi( /* initialize sampling hemisphere */ |
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register AMBHEMI *hp, |
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+ |
COLOR ac, |
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RAY *r, |
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COLOR ac, |
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double wt |
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) |
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{ |
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int ns; |
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double d; |
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register int i; |
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/* set number of divisions */ |
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if (ambacc <= FTINY && |
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wt > (d = 0.8*bright(ac)*r->rweight/(ambdiv*minweight))) |
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wt = d; /* avoid ray termination */ |
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hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
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i = ambacc > FTINY ? 3 : 1; /* minimum number of samples */ |
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if (hp->nt < i) |
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hp->nt = i; |
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hp->np = PI * hp->nt + 0.5; |
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/* set number of super-samples */ |
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< |
ns = ambssamp * wt + 0.5; |
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> |
hp->ns = ambssamp * wt + 0.5; |
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/* assign coefficient */ |
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d = 1.0/(hp->nt*hp->np + ns); /* XXX weight not uniform if ns > 0 */ |
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copycolor(hp->acoef, ac); |
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d = 1.0/(hp->nt*hp->np); |
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scalecolor(hp->acoef, d); |
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/* make axes */ |
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VCOPY(hp->uz, r->ron); |
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fcross(hp->ux, hp->uy, hp->uz); |
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normalize(hp->ux); |
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fcross(hp->uy, hp->uz, hp->ux); |
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return(ns); |
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} |
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|
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double b2; |
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double phi; |
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register int i; |
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/* assign coefficient */ |
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if (ambacc <= FTINY) /* no storage, so report accurately */ |
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< |
copycolor(ar.rcoef, h->acoef); |
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else /* else lie for sake of cache */ |
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/* ambient coefficient for weight */ |
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if (ambacc > FTINY) |
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setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
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else |
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copycolor(ar.rcoef, h->acoef); |
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if (rayorigin(&ar, AMBIENT, r, ar.rcoef) < 0) |
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return(-1); |
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copycolor(ar.rcoef, h->acoef); /* correct coefficient rtrace output */ |
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if (ambacc > FTINY) { |
81 |
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multcolor(ar.rcoef, h->acoef); |
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scalecolor(ar.rcoef, 1./AVGREFL); |
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} |
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hlist[0] = r->rno; |
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hlist[1] = dp->t; |
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hlist[2] = dp->p; |
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dimlist[ndims++] = dp->t*h->np + dp->p + 90171; |
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rayvalue(&ar); |
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ndims--; |
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multcolor(ar.rcol, ar.rcoef); /* apply coefficient */ |
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addcolor(dp->v, ar.rcol); |
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/* use rt to improve gradient calc */ |
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if (ar.rt > FTINY && ar.rt < FHUGE) |
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doambient( /* compute ambient component */ |
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COLOR acol, |
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RAY *r, |
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COLOR ac, |
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double wt, |
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FVECT pg, |
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FVECT dg |
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AMBSAMP dnew; |
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register AMBSAMP *dp; |
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double arad; |
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< |
int ndivs, ns; |
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> |
int ndivs; |
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register int i, j; |
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/* initialize color */ |
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setcolor(acol, 0.0, 0.0, 0.0); |
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/* initialize hemisphere */ |
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ns = inithemi(&hemi, r, ac, wt); |
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inithemi(&hemi, acol, r, wt); |
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ndivs = hemi.nt * hemi.np; |
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/* initialize */ |
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if (pg != NULL) |
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pg[0] = pg[1] = pg[2] = 0.0; |
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if (dg != NULL) |
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dg[0] = dg[1] = dg[2] = 0.0; |
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setcolor(acol, 0.0, 0.0, 0.0); |
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if (ndivs == 0) |
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return(0.0); |
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/* allocate super-samples */ |
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if (ns > 0 || pg != NULL || dg != NULL) { |
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if (hemi.ns > 0 || pg != NULL || dg != NULL) { |
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div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
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if (div == NULL) |
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error(SYSTEM, "out of memory in doambient"); |
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setcolor(dp->v, 0.0, 0.0, 0.0); |
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dp->r = 0.0; |
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dp->n = 0; |
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< |
if (divsample(dp, &hemi, r) < 0) |
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< |
goto oopsy; |
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> |
if (divsample(dp, &hemi, r) < 0) { |
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if (div != NULL) dp++; |
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> |
hemi.ns = 0; /* incomplete sampling */ |
197 |
> |
pg = dg = NULL; |
198 |
> |
continue; |
199 |
> |
} |
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arad += dp->r; |
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if (div != NULL) |
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dp++; |
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else |
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addcolor(acol, dp->v); |
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} |
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if (ns > 0 && arad > FTINY && ndivs/arad < minarad) |
207 |
< |
ns = 0; /* close enough */ |
208 |
< |
else if (ns > 0) { /* else perform super-sampling */ |
206 |
> |
if (hemi.ns > 0 && arad > FTINY && ndivs/arad < minarad) |
207 |
> |
hemi.ns = 0; /* close enough */ |
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else if (hemi.ns > 0) { /* else perform super-sampling */ |
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comperrs(div, &hemi); /* compute errors */ |
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qsort(div, ndivs, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
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/* super-sample */ |
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for (i = ns; i > 0; i--) { |
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> |
for (i = hemi.ns; i > 0; i--) { |
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dnew = *div; |
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< |
if (divsample(&dnew, &hemi, r) < 0) |
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< |
goto oopsy; |
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< |
/* reinsert */ |
217 |
< |
dp = div; |
214 |
> |
if (divsample(&dnew, &hemi, r) < 0) { |
215 |
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dp++; |
216 |
> |
continue; |
217 |
> |
} |
218 |
> |
dp = div; /* reinsert */ |
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j = ndivs < i ? ndivs : i; |
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while (--j > 0 && dnew.k < dp[1].k) { |
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*dp = *(dp+1); |
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} |
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b = bright(acol); |
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if (b > FTINY) { |
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< |
b = ndivs/b; |
244 |
> |
b = 1.0/b; /* compute & normalize gradient(s) */ |
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if (pg != NULL) { |
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posgradient(pg, div, &hemi); |
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for (i = 0; i < 3; i++) |
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for (i = 0; i < 3; i++) |
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dg[i] *= b; |
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} |
242 |
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} else { |
243 |
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if (pg != NULL) |
244 |
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for (i = 0; i < 3; i++) |
245 |
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pg[i] = 0.0; |
246 |
– |
if (dg != NULL) |
247 |
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for (i = 0; i < 3; i++) |
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dg[i] = 0.0; |
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} |
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free((void *)div); |
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} |
252 |
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b = 1.0/ndivs; |
253 |
– |
scalecolor(acol, b); |
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if (arad <= FTINY) |
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arad = maxarad; |
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else |
261 |
< |
arad = (ndivs+ns)/arad; |
261 |
> |
arad = (ndivs+hemi.ns)/arad; |
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if (pg != NULL) { /* reduce radius if gradient large */ |
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d = DOT(pg,pg); |
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if (d*arad*arad > 1.0) |
275 |
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if ((arad /= sqrt(wt)) > maxarad) |
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arad = maxarad; |
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return(arad); |
274 |
– |
oopsy: |
275 |
– |
if (div != NULL) |
276 |
– |
free((void *)div); |
277 |
– |
return(0.0); |
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} |
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280 |
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384 |
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yd += mag0*sinp + mag1*cosp; |
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} |
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for (i = 0; i < 3; i++) |
387 |
< |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/PI; |
387 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])*(hp->nt*hp->np)/PI; |
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} |
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390 |
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yd += mag * tsin(phi); |
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} |
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for (i = 0; i < 3; i++) |
422 |
< |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/(hp->nt*hp->np); |
422 |
> |
gv[i] = xd*hp->ux[i] + yd*hp->uy[i]; |
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} |