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#include "ambient.h" |
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#include "random.h" |
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|
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< |
#ifdef NEWAMB |
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> |
#ifndef OLDAMB |
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|
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extern void SDsquare2disk(double ds[2], double seedx, double seedy); |
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static int |
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+ |
ambcollision( /* proposed direciton collides? */ |
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AMBHEMI *hp, |
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+ |
int i, |
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+ |
int j, |
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FVECT dv |
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) |
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{ |
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const double cos_thresh = 0.9999995; /* about 3.44 arcminutes */ |
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int ii, jj; |
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+ |
|
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for (ii = i-1; ii <= i+1; ii++) { |
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if (ii < 0) continue; |
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if (ii >= hp->ns) break; |
| 67 |
+ |
for (jj = j-1; jj <= j+1; jj++) { |
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+ |
AMBSAMP *ap; |
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+ |
FVECT avec; |
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+ |
double dprod; |
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if (jj < 0) continue; |
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+ |
if (jj >= hp->ns) break; |
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if ((ii==i) & (jj==j)) continue; |
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ap = &ambsam(hp,ii,jj); |
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if (ap->d <= .5/FHUGE) continue; |
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VSUB(avec, ap->p, hp->rp->rop); |
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dprod = DOT(avec, dv); |
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if (dprod >= cos_thresh*VLEN(avec)) |
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return(1); /* collision */ |
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+ |
} |
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} |
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return(0); |
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} |
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+ |
|
| 85 |
+ |
|
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static int |
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ambsample( /* initial ambient division sample */ |
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AMBHEMI *hp, |
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int i, |
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hlist[1] = j; |
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hlist[2] = i; |
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multisamp(spt, 2, urand(ilhash(hlist,3)+n)); |
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< |
if (!n) { /* avoid border samples for n==0 */ |
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< |
if ((spt[0] < 0.1) | (spt[0] >= 0.9)) |
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< |
spt[0] = 0.1 + 0.8*frandom(); |
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< |
if ((spt[1] < 0.1) | (spt[1] >= 0.9)) |
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< |
spt[1] = 0.1 + 0.8*frandom(); |
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< |
} |
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> |
resample: |
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SDsquare2disk(spt, (j+spt[1])/hp->ns, (i+spt[0])/hp->ns); |
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zd = sqrt(1. - spt[0]*spt[0] - spt[1]*spt[1]); |
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for (ii = 3; ii--; ) |
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spt[1]*hp->uy[ii] + |
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zd*hp->rp->ron[ii]; |
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checknorm(ar.rdir); |
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+ |
/* avoid coincident samples */ |
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if (!n && ambcollision(hp, i, j, ar.rdir)) { |
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spt[0] = frandom(); spt[1] = frandom(); |
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goto resample; |
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} |
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dimlist[ndims++] = AI(hp,i,j) + 90171; |
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rayvalue(&ar); /* evaluate ray */ |
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ndims--; |
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float *earr = getambdiffs(hp); |
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double e2rem = 0; |
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AMBSAMP *ap; |
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RAY ar; |
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float *ep; |
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int i, j, n, nss; |
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d = 1.0/(n*n); |
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scalecolor(hp->acoef, d); |
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/* make tangent plane axes */ |
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< |
hp->uy[0] = 0.5 - frandom(); |
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< |
hp->uy[1] = 0.5 - frandom(); |
| 239 |
< |
hp->uy[2] = 0.5 - frandom(); |
| 240 |
< |
for (i = 3; i--; ) |
| 241 |
< |
if ((-0.6 < r->ron[i]) & (r->ron[i] < 0.6)) |
| 242 |
< |
break; |
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< |
if (i < 0) |
| 269 |
> |
if (!getperpendicular(hp->ux, r->ron, 1)) |
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|
error(CONSISTENCY, "bad ray direction in samp_hemi"); |
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hp->uy[i] = 1.0; |
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– |
VCROSS(hp->ux, hp->uy, r->ron); |
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– |
normalize(hp->ux); |
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VCROSS(hp->uy, r->ron, hp->ux); |
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/* sample divisions */ |
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for (i = hp->ns; i--; ) |
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ambcorral(AMBHEMI *hp, FVECT uv[2], const double r0, const double r1) |
| 632 |
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{ |
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const double max_d = 1.0/(minarad*ambacc + 0.001); |
| 634 |
< |
const double ang_res = 0.5*PI/(hp->ns-1); |
| 635 |
< |
const double ang_step = ang_res/((int)(16/PI*ang_res) + (1+FTINY)); |
| 634 |
> |
const double ang_res = 0.5*PI/hp->ns; |
| 635 |
> |
const double ang_step = ang_res/((int)(16/PI*ang_res) + 1.01); |
| 636 |
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double avg_d = 0; |
| 637 |
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uint32 flgs = 0; |
| 638 |
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FVECT vec; |
| 640 |
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double ang, a1; |
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int i, j; |
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/* don't bother for a few samples */ |
| 643 |
< |
if (hp->ns < 12) |
| 643 |
> |
if (hp->ns < 8) |
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return(0); |
| 645 |
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/* check distances overhead */ |
| 646 |
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for (i = hp->ns*3/4; i-- > hp->ns>>2; ) |
| 663 |
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if ((r0*r0*u*u + r1*r1*v*v) * ap->d*ap->d <= u*u + v*v) |
| 664 |
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continue; /* occluder outside ellipse */ |
| 665 |
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ang = atan2a(v, u); /* else set direction flags */ |
| 666 |
< |
for (a1 = ang-.5*ang_res; a1 <= ang+.5*ang_res; a1 += ang_step) |
| 666 |
> |
for (a1 = ang-ang_res; a1 <= ang+ang_res; a1 += ang_step) |
| 667 |
|
flgs |= 1L<<(int)(16/PI*(a1 + 2.*PI*(a1 < 0))); |
| 668 |
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} |
| 669 |
|
/* add low-angle incident (< 20deg) */ |
| 716 |
|
return(0); |
| 717 |
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|
| 718 |
|
if ((ra == NULL) & (pg == NULL) & (dg == NULL) || |
| 719 |
< |
(hp->sampOK < 0) | (hp->ns < 4)) { |
| 719 |
> |
(hp->sampOK < 0) | (hp->ns < 6)) { |
| 720 |
|
free(hp); /* Hessian not requested/possible */ |
| 721 |
|
return(-1); /* value-only return value */ |
| 722 |
|
} |
| 764 |
|
ra[0] = maxarad; |
| 765 |
|
} |
| 766 |
|
/* flag encroached directions */ |
| 767 |
< |
if ((wt >= 0.89*AVGREFL) & (crlp != NULL)) |
| 767 |
> |
if (crlp != NULL) |
| 768 |
|
*crlp = ambcorral(hp, uv, ra[0]*ambacc, ra[1]*ambacc); |
| 769 |
|
if (pg != NULL) { /* cap gradient if necessary */ |
| 770 |
|
d = pg[0]*pg[0]*ra[0]*ra[0] + pg[1]*pg[1]*ra[1]*ra[1]; |
