| 64 |
|
int ii, jj; |
| 65 |
|
/* min. spacing = 1/4th division */ |
| 66 |
|
cos_thresh = (PI/4.)/(double)hp->ns; |
| 67 |
+ |
if (cos_thresh > 7.*PI/180.) /* 7 degrees is enough in any case */ |
| 68 |
+ |
cos_thresh = 7.*PI/180.; |
| 69 |
|
cos_thresh = 1. - .5*cos_thresh*cos_thresh; |
| 70 |
|
/* check existing neighbors */ |
| 71 |
|
for (ii = i-1; ii <= i+1; ii++) { |
| 102 |
|
AMBSAMP *ap = &ambsam(hp,i,j); |
| 103 |
|
RAY ar; |
| 104 |
|
int hlist[3], ii; |
| 105 |
+ |
double ss[2]; |
| 106 |
|
RREAL spt[2]; |
| 107 |
|
double zd; |
| 108 |
|
/* generate hemispherical sample */ |
| 118 |
|
scalescolor(ar.rcoef, 1./AVGREFL); |
| 119 |
|
} |
| 120 |
|
hlist[0] = hp->rp->rno; |
| 121 |
< |
hlist[1] = j; |
| 122 |
< |
hlist[2] = i; |
| 123 |
< |
multisamp(spt, 2, urand(ilhash(hlist,3)+n)); |
| 121 |
> |
hlist[1] = AI(hp,i,j); |
| 122 |
> |
hlist[2] = samplendx; |
| 123 |
> |
multisamp(ss, 2, urand(ilhash(hlist,3)+n)); |
| 124 |
|
resample: |
| 125 |
< |
square2disk(spt, (j+spt[1])/hp->ns, (i+spt[0])/hp->ns); |
| 125 |
> |
square2disk(spt, (j+ss[1])/hp->ns, (i+ss[0])/hp->ns); |
| 126 |
|
zd = sqrt(1. - spt[0]*spt[0] - spt[1]*spt[1]); |
| 127 |
|
for (ii = 3; ii--; ) |
| 128 |
|
ar.rdir[ii] = spt[0]*hp->ux[ii] + |
| 129 |
|
spt[1]*hp->uy[ii] + |
| 130 |
|
zd*hp->onrm[ii]; |
| 131 |
|
checknorm(ar.rdir); |
| 132 |
< |
/* avoid coincident samples */ |
| 133 |
< |
if (!n && ambcollision(hp, i, j, ar.rdir)) { |
| 134 |
< |
spt[0] = frandom(); spt[1] = frandom(); |
| 132 |
> |
/* avoid coincident samples? */ |
| 133 |
> |
if (!n & (ambacc > FTINY) & (hp->ns >= 4) && |
| 134 |
> |
ambcollision(hp, i, j, ar.rdir)) { |
| 135 |
> |
ss[0] = frandom(); ss[1] = frandom(); |
| 136 |
|
goto resample; /* reject this sample */ |
| 137 |
|
} |
| 138 |
|
dimlist[ndims++] = AI(hp,i,j) + 90171; |
| 166 |
|
static float * |
| 167 |
|
getambdiffs(AMBHEMI *hp) |
| 168 |
|
{ |
| 169 |
< |
const double normf = 1./bright(hp->acoef); |
| 170 |
< |
float *earr = (float *)calloc(hp->ns*hp->ns, sizeof(float)); |
| 169 |
> |
const double normf = 1./(pbright(hp->acoef) + FTINY); |
| 170 |
> |
float *earr = (float *)calloc(2*hp->ns*hp->ns, sizeof(float)); |
| 171 |
|
float *ep; |
| 172 |
|
AMBSAMP *ap; |
| 173 |
|
double b, b1, d2; |
| 176 |
|
if (earr == NULL) /* out of memory? */ |
| 177 |
|
return(NULL); |
| 178 |
|
/* sum squared neighbor diffs */ |
| 179 |
< |
for (ap = hp->sa, ep = earr, i = 0; i < hp->ns; i++) |
| 179 |
> |
ap = hp->sa; |
| 180 |
> |
ep = earr + hp->ns*hp->ns; /* original estimates to scratch */ |
| 181 |
> |
for (i = 0; i < hp->ns; i++) |
| 182 |
|
for (j = 0; j < hp->ns; j++, ap++, ep++) { |
| 183 |
|
b = pbright(ap[0].v); |
| 184 |
|
if (i) { /* from above */ |
| 204 |
|
ep[-hp->ns-1] += d2; |
| 205 |
|
} |
| 206 |
|
/* correct for number of neighbors */ |
| 207 |
< |
earr[0] *= 8./3.; |
| 208 |
< |
earr[hp->ns-1] *= 8./3.; |
| 209 |
< |
earr[(hp->ns-1)*hp->ns] *= 8./3.; |
| 210 |
< |
earr[(hp->ns-1)*hp->ns + hp->ns-1] *= 8./3.; |
| 207 |
> |
ep = earr + hp->ns*hp->ns; |
| 208 |
> |
ep[0] *= 6./3.; |
| 209 |
> |
ep[hp->ns-1] *= 6./3.; |
| 210 |
> |
ep[(hp->ns-1)*hp->ns] *= 6./3.; |
| 211 |
> |
ep[(hp->ns-1)*hp->ns + hp->ns-1] *= 6./3.; |
| 212 |
|
for (i = 1; i < hp->ns-1; i++) { |
| 213 |
< |
earr[i*hp->ns] *= 8./5.; |
| 214 |
< |
earr[i*hp->ns + hp->ns-1] *= 8./5.; |
| 213 |
> |
ep[i*hp->ns] *= 6./5.; |
| 214 |
> |
ep[i*hp->ns + hp->ns-1] *= 6./5.; |
| 215 |
|
} |
| 216 |
|
for (j = 1; j < hp->ns-1; j++) { |
| 217 |
< |
earr[j] *= 8./5.; |
| 218 |
< |
earr[(hp->ns-1)*hp->ns + j] *= 8./5.; |
| 217 |
> |
ep[j] *= 6./5.; |
| 218 |
> |
ep[(hp->ns-1)*hp->ns + j] *= 6./5.; |
| 219 |
|
} |
| 220 |
+ |
/* blur final map to reduce bias */ |
| 221 |
+ |
for (i = 0; i < hp->ns-1; i++) { |
| 222 |
+ |
float *ep2; |
| 223 |
+ |
ep = earr + i*hp->ns; |
| 224 |
+ |
ep2 = ep + hp->ns*hp->ns; |
| 225 |
+ |
for (j = 0; j < hp->ns-1; j++, ep++, ep2++) { |
| 226 |
+ |
ep[0] += .5*ep2[0] + .125*(ep2[1] + ep2[hp->ns]); |
| 227 |
+ |
ep[1] += .125*ep2[0]; |
| 228 |
+ |
ep[hp->ns] += .125*ep2[0]; |
| 229 |
+ |
} |
| 230 |
+ |
} |
| 231 |
|
return(earr); |
| 232 |
|
} |
| 233 |
|
|
| 279 |
|
/* set number of divisions */ |
| 280 |
|
if (backside) wt = -wt; |
| 281 |
|
if (ambacc <= FTINY && |
| 282 |
< |
wt > (d *= 0.8*r->rweight/(ambdiv*minweight))) |
| 282 |
> |
wt > (d *= 0.8*r->rweight/(ambdiv*minweight + 1e-20))) |
| 283 |
|
wt = d; /* avoid ray termination */ |
| 284 |
|
n = sqrt(ambdiv * wt) + 0.5; |
| 285 |
|
i = 1 + (MINADIV-1)*(ambacc > FTINY); |
| 328 |
|
if (hp->sampOK <= MINADIV*MINADIV) |
| 329 |
|
return(hp); /* don't bother super-sampling */ |
| 330 |
|
n = ambssamp*wt + 0.5; |
| 331 |
< |
if (n > 8) { /* perform super-sampling? */ |
| 331 |
> |
if (n >= 4*hp->ns) { /* perform super-sampling? */ |
| 332 |
|
ambsupersamp(hp, n); |
| 333 |
|
copyscolor(rcol, hp->acol); |
| 334 |
|
} |
