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#include "copyright.h" |
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#include "ray.h" |
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#include "ambient.h" |
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#include "random.h" |
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#ifdef NEWAMB |
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|
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< |
int |
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> |
#else /* ! NEWAMB */ |
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> |
|
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> |
|
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> |
void |
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inithemi( /* initialize sampling hemisphere */ |
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< |
register AMBHEMI *hp, |
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> |
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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> |
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*intens(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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|
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int |
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divsample( /* sample a division */ |
| 63 |
< |
register AMBSAMP *dp, |
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> |
AMBSAMP *dp, |
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AMBHEMI *h, |
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RAY *r |
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) |
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double xd, yd, zd; |
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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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> |
int i; |
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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 */ |
| 82 |
> |
if (ambacc > FTINY) { |
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> |
multcolor(ar.rcoef, h->acoef); |
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> |
scalecolor(ar.rcoef, 1./AVGREFL); |
| 85 |
> |
} |
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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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ar.rdir[i] = xd*h->ux[i] + |
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yd*h->uy[i] + |
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zd*h->uz[i]; |
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+ |
checknorm(ar.rdir); |
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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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{ |
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const AMBSAMP *d1 = (const AMBSAMP *)p1; |
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const AMBSAMP *d2 = (const AMBSAMP *)p2; |
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register int c; |
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> |
int c; |
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|
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if ( (c = d1->t - d2->t) ) |
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return(c); |
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|
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double |
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doambient( /* compute ambient component */ |
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COLOR acol, |
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COLOR rcol, |
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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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) |
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{ |
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double b, d; |
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> |
double b, d=0; |
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AMBHEMI hemi; |
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AMBSAMP *div; |
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AMBSAMP dnew; |
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< |
register AMBSAMP *dp; |
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> |
double acol[3]; |
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> |
AMBSAMP *dp; |
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double arad; |
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< |
int ndivs, ns; |
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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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> |
int divcnt; |
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> |
int i, j; |
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/* initialize hemisphere */ |
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< |
ns = 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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> |
inithemi(&hemi, rcol, r, wt); |
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> |
divcnt = 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(rcol, 0.0, 0.0, 0.0); |
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> |
if (divcnt == 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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< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
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> |
if (hemi.ns > 0 || pg != NULL || dg != NULL) { |
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> |
div = (AMBSAMP *)malloc(divcnt*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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div = NULL; |
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/* sample the divisions */ |
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arad = 0.0; |
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acol[0] = acol[1] = acol[2] = 0.0; |
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if ((dp = div) == NULL) |
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dp = &dnew; |
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+ |
divcnt = 0; |
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for (i = 0; i < hemi.nt; i++) |
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for (j = 0; j < hemi.np; j++) { |
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dp->t = i; dp->p = j; |
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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) |
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> |
dp++; |
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> |
continue; |
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> |
} |
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arad += dp->r; |
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+ |
divcnt++; |
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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) |
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< |
ns = 0; /* close enough */ |
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< |
else if (ns > 0) { /* else perform super-sampling */ |
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> |
if (!divcnt) { |
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> |
if (div != NULL) |
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> |
free((void *)div); |
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> |
return(0.0); /* no samples taken */ |
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> |
} |
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> |
if (divcnt < hemi.nt*hemi.np) { |
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> |
pg = dg = NULL; /* incomplete sampling */ |
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> |
hemi.ns = 0; |
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> |
} else if (arad > FTINY && divcnt/arad < minarad) { |
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> |
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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> |
qsort(div, divcnt, 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 */ |
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< |
dp = div; |
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< |
j = ndivs < i ? ndivs : i; |
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> |
if (divsample(&dnew, &hemi, r) < 0) { |
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> |
dp++; |
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> |
continue; |
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> |
} |
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> |
dp = div; /* reinsert */ |
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> |
j = divcnt < i ? divcnt : i; |
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while (--j > 0 && dnew.k < dp[1].k) { |
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*dp = *(dp+1); |
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dp++; |
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*dp = dnew; |
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} |
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if (pg != NULL || dg != NULL) /* restore order */ |
| 241 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambnorm); |
| 241 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambnorm); |
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} |
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/* compute returned values */ |
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|
if (div != NULL) { |
| 245 |
< |
arad = 0.0; |
| 246 |
< |
for (i = ndivs, dp = div; i-- > 0; dp++) { |
| 245 |
> |
arad = 0.0; /* note: divcnt may be < nt*np */ |
| 246 |
> |
for (i = hemi.nt*hemi.np, dp = div; i-- > 0; dp++) { |
| 247 |
|
arad += dp->r; |
| 248 |
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if (dp->n > 1) { |
| 249 |
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b = 1.0/dp->n; |
| 255 |
|
} |
| 256 |
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b = bright(acol); |
| 257 |
|
if (b > FTINY) { |
| 258 |
< |
b = ndivs/b; |
| 258 |
> |
b = 1.0/b; /* compute & normalize gradient(s) */ |
| 259 |
|
if (pg != NULL) { |
| 260 |
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posgradient(pg, div, &hemi); |
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for (i = 0; i < 3; i++) |
| 266 |
|
for (i = 0; i < 3; i++) |
| 267 |
|
dg[i] *= b; |
| 268 |
|
} |
| 242 |
– |
} else { |
| 243 |
– |
if (pg != NULL) |
| 244 |
– |
for (i = 0; i < 3; i++) |
| 245 |
– |
pg[i] = 0.0; |
| 246 |
– |
if (dg != NULL) |
| 247 |
– |
for (i = 0; i < 3; i++) |
| 248 |
– |
dg[i] = 0.0; |
| 269 |
|
} |
| 270 |
|
free((void *)div); |
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|
} |
| 272 |
< |
b = 1.0/ndivs; |
| 253 |
< |
scalecolor(acol, b); |
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> |
copycolor(rcol, acol); |
| 273 |
|
if (arad <= FTINY) |
| 274 |
|
arad = maxarad; |
| 275 |
|
else |
| 276 |
< |
arad = (ndivs+ns)/arad; |
| 276 |
> |
arad = (divcnt+hemi.ns)/arad; |
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if (pg != NULL) { /* reduce radius if gradient large */ |
| 278 |
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d = DOT(pg,pg); |
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if (d*arad*arad > 1.0) |
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if ((arad /= sqrt(wt)) > maxarad) |
| 291 |
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arad = maxarad; |
| 292 |
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return(arad); |
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– |
oopsy: |
| 275 |
– |
if (div != NULL) |
| 276 |
– |
free((void *)div); |
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– |
return(0.0); |
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} |
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|
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|
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void |
| 297 |
|
comperrs( /* compute initial error estimates */ |
| 298 |
|
AMBSAMP *da, /* assumes standard ordering */ |
| 299 |
< |
register AMBHEMI *hp |
| 299 |
> |
AMBHEMI *hp |
| 300 |
|
) |
| 301 |
|
{ |
| 302 |
|
double b, b2; |
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int i, j; |
| 304 |
< |
register AMBSAMP *dp; |
| 304 |
> |
AMBSAMP *dp; |
| 305 |
|
/* sum differences from neighbors */ |
| 306 |
|
dp = da; |
| 307 |
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for (i = 0; i < hp->nt; i++) |
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posgradient( /* compute position gradient */ |
| 350 |
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FVECT gv, |
| 351 |
|
AMBSAMP *da, /* assumes standard ordering */ |
| 352 |
< |
register AMBHEMI *hp |
| 352 |
> |
AMBHEMI *hp |
| 353 |
|
) |
| 354 |
|
{ |
| 355 |
< |
register int i, j; |
| 355 |
> |
int i, j; |
| 356 |
|
double nextsine, lastsine, b, d; |
| 357 |
|
double mag0, mag1; |
| 358 |
|
double phi, cosp, sinp, xd, yd; |
| 359 |
< |
register AMBSAMP *dp; |
| 359 |
> |
AMBSAMP *dp; |
| 360 |
|
|
| 361 |
|
xd = yd = 0.0; |
| 362 |
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for (j = 0; j < hp->np; j++) { |
| 399 |
|
yd += mag0*sinp + mag1*cosp; |
| 400 |
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} |
| 401 |
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for (i = 0; i < 3; i++) |
| 402 |
< |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/PI; |
| 402 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])*(hp->nt*hp->np)/PI; |
| 403 |
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} |
| 404 |
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|
| 405 |
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|
| 407 |
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dirgradient( /* compute direction gradient */ |
| 408 |
|
FVECT gv, |
| 409 |
|
AMBSAMP *da, /* assumes standard ordering */ |
| 410 |
< |
register AMBHEMI *hp |
| 410 |
> |
AMBHEMI *hp |
| 411 |
|
) |
| 412 |
|
{ |
| 413 |
< |
register int i, j; |
| 413 |
> |
int i, j; |
| 414 |
|
double mag; |
| 415 |
|
double phi, xd, yd; |
| 416 |
< |
register AMBSAMP *dp; |
| 416 |
> |
AMBSAMP *dp; |
| 417 |
|
|
| 418 |
|
xd = yd = 0.0; |
| 419 |
|
for (j = 0; j < hp->np; j++) { |
| 434 |
|
yd += mag * tsin(phi); |
| 435 |
|
} |
| 436 |
|
for (i = 0; i < 3; i++) |
| 437 |
< |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/(hp->nt*hp->np); |
| 437 |
> |
gv[i] = xd*hp->ux[i] + yd*hp->uy[i]; |
| 438 |
|
} |
| 439 |
+ |
|
| 440 |
+ |
#endif /* ! NEWAMB */ |
