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#include "random.h" |
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|
| 18 |
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|
| 19 |
< |
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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RAY *r, |
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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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< |
hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
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> |
hp->nt = sqrt(ambdiv * wt * (1./PI/AVGREFL)) + 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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< |
/* 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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> |
hp->ns = ambssamp * wt + 0.5; |
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> |
/* assign coefficients */ |
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copycolor(hp->acoef, ac); |
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< |
scalecolor(hp->acoef, d); |
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> |
if (wt >= r->rweight) |
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> |
hp->drc = 1.; |
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> |
else |
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> |
hp->drc = wt / r->rweight; |
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/* make axes */ |
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VCOPY(hp->uz, r->ron); |
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hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0; |
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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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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 */ |
| 74 |
< |
copycolor(ar.rcoef, h->acoef); |
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< |
else /* else lie for sake of cache */ |
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< |
setcolor(ar.rcoef, AVGREFL, AVGREFL, AVGREFL); |
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> |
/* ambient coefficient for weight */ |
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> |
setcolor(ar.rcoef, h->drc, h->drc, h->drc); |
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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 */ |
| 75 |
> |
copycolor(ar.rcoef, h->acoef); /* correct coefficient for trace */ |
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> |
b2 = 1.0/(h->nt*h->np + h->ns); /* XXX not uniform if ns > 0 */ |
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> |
scalecolor(ar.rcoef, b2); |
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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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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, r, ac, wt); |
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ndivs = hemi.nt * hemi.np; |
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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) { |
| 168 |
> |
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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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) |
| 193 |
< |
ns = 0; /* close enough */ |
| 194 |
< |
else if (ns > 0) { /* else perform super-sampling */ |
| 192 |
> |
if (hemi.ns > 0 && arad > FTINY && ndivs/arad < minarad) |
| 193 |
> |
hemi.ns = 0; /* close enough */ |
| 194 |
> |
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 */ |
| 198 |
< |
for (i = ns; i > 0; i--) { |
| 198 |
> |
for (i = hemi.ns; i > 0; i--) { |
| 199 |
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dnew = *div; |
| 200 |
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if (divsample(&dnew, &hemi, r) < 0) |
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goto oopsy; |
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if (arad <= FTINY) |
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arad = maxarad; |
| 254 |
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else |
| 255 |
< |
arad = (ndivs+ns)/arad; |
| 255 |
> |
arad = (ndivs+hemi.ns)/arad; |
| 256 |
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if (pg != NULL) { /* reduce radius if gradient large */ |
| 257 |
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d = DOT(pg,pg); |
| 258 |
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if (d*arad*arad > 1.0) |
