100 |
|
AMBSAMP *ap = &ambsam(hp,i,j); |
101 |
|
RAY ar; |
102 |
|
int hlist[3], ii; |
103 |
+ |
double ss[2]; |
104 |
|
RREAL spt[2]; |
105 |
|
double zd; |
106 |
|
/* generate hemispherical sample */ |
112 |
|
if (rayorigin(&ar, hp->atyp, hp->rp, ar.rcoef) < 0) |
113 |
|
return(0); |
114 |
|
if (ambacc > FTINY) { |
115 |
+ |
#ifdef SSKIPOPT |
116 |
+ |
ar.rsrc = -1; /* protect cache from source opt. */ |
117 |
+ |
ar.scorr = 1.f; |
118 |
+ |
#endif |
119 |
|
smultscolor(ar.rcoef, hp->acoef); |
120 |
|
scalescolor(ar.rcoef, 1./AVGREFL); |
121 |
|
} |
122 |
|
hlist[0] = hp->rp->rno; |
123 |
< |
hlist[1] = j; |
124 |
< |
hlist[2] = i; |
125 |
< |
multisamp(spt, 2, urand(ilhash(hlist,3)+n)); |
123 |
> |
hlist[1] = AI(hp,i,j); |
124 |
> |
hlist[2] = samplendx; |
125 |
> |
multisamp(ss, 2, urand(ilhash(hlist,3)+n)); |
126 |
|
resample: |
127 |
< |
square2disk(spt, (j+spt[1])/hp->ns, (i+spt[0])/hp->ns); |
127 |
> |
square2disk(spt, (j+ss[1])/hp->ns, (i+ss[0])/hp->ns); |
128 |
|
zd = sqrt(1. - spt[0]*spt[0] - spt[1]*spt[1]); |
129 |
|
for (ii = 3; ii--; ) |
130 |
|
ar.rdir[ii] = spt[0]*hp->ux[ii] + |
132 |
|
zd*hp->onrm[ii]; |
133 |
|
checknorm(ar.rdir); |
134 |
|
/* avoid coincident samples */ |
135 |
< |
if (!n && ambcollision(hp, i, j, ar.rdir)) { |
136 |
< |
spt[0] = frandom(); spt[1] = frandom(); |
135 |
> |
if (!n && hp->ns >= 4 && ambcollision(hp, i, j, ar.rdir)) { |
136 |
> |
ss[0] = frandom(); ss[1] = frandom(); |
137 |
|
goto resample; /* reject this sample */ |
138 |
|
} |
139 |
|
dimlist[ndims++] = AI(hp,i,j) + 90171; |
168 |
|
getambdiffs(AMBHEMI *hp) |
169 |
|
{ |
170 |
|
const double normf = 1./(pbright(hp->acoef) + FTINY); |
171 |
< |
float *earr = (float *)calloc(hp->ns*hp->ns, sizeof(float)); |
172 |
< |
float *ep, *earr2; |
171 |
> |
float *earr = (float *)calloc(2*hp->ns*hp->ns, sizeof(float)); |
172 |
> |
float *ep; |
173 |
|
AMBSAMP *ap; |
174 |
|
double b, b1, d2; |
175 |
|
int i, j; |
177 |
|
if (earr == NULL) /* out of memory? */ |
178 |
|
return(NULL); |
179 |
|
/* sum squared neighbor diffs */ |
180 |
< |
for (ap = hp->sa, ep = earr, i = 0; i < hp->ns; i++) |
180 |
> |
ap = hp->sa; |
181 |
> |
ep = earr + hp->ns*hp->ns; /* original estimates to scratch */ |
182 |
> |
for (i = 0; i < hp->ns; i++) |
183 |
|
for (j = 0; j < hp->ns; j++, ap++, ep++) { |
184 |
|
b = pbright(ap[0].v); |
185 |
|
if (i) { /* from above */ |
205 |
|
ep[-hp->ns-1] += d2; |
206 |
|
} |
207 |
|
/* correct for number of neighbors */ |
208 |
< |
earr[0] *= 6./3.; |
209 |
< |
earr[hp->ns-1] *= 6./3.; |
210 |
< |
earr[(hp->ns-1)*hp->ns] *= 6./3.; |
211 |
< |
earr[(hp->ns-1)*hp->ns + hp->ns-1] *= 6./3.; |
208 |
> |
ep = earr + hp->ns*hp->ns; |
209 |
> |
ep[0] *= 6./3.; |
210 |
> |
ep[hp->ns-1] *= 6./3.; |
211 |
> |
ep[(hp->ns-1)*hp->ns] *= 6./3.; |
212 |
> |
ep[(hp->ns-1)*hp->ns + hp->ns-1] *= 6./3.; |
213 |
|
for (i = 1; i < hp->ns-1; i++) { |
214 |
< |
earr[i*hp->ns] *= 6./5.; |
215 |
< |
earr[i*hp->ns + hp->ns-1] *= 6./5.; |
214 |
> |
ep[i*hp->ns] *= 6./5.; |
215 |
> |
ep[i*hp->ns + hp->ns-1] *= 6./5.; |
216 |
|
} |
217 |
|
for (j = 1; j < hp->ns-1; j++) { |
218 |
< |
earr[j] *= 6./5.; |
219 |
< |
earr[(hp->ns-1)*hp->ns + j] *= 6./5.; |
218 |
> |
ep[j] *= 6./5.; |
219 |
> |
ep[(hp->ns-1)*hp->ns + j] *= 6./5.; |
220 |
|
} |
221 |
< |
/* preen map to avoid cliffs */ |
214 |
< |
earr2 = (float *)malloc(hp->ns*hp->ns*sizeof(float)); |
215 |
< |
if (earr2 == NULL) |
216 |
< |
return(earr); |
217 |
< |
memcpy(earr2, earr, hp->ns*hp->ns*sizeof(float)); |
221 |
> |
/* blur final map to reduce bias */ |
222 |
|
for (i = 0; i < hp->ns-1; i++) { |
223 |
< |
float *ep2 = earr2 + i*hp->ns; |
223 |
> |
float *ep2; |
224 |
|
ep = earr + i*hp->ns; |
225 |
< |
for (j = 0; j < hp->ns-1; j++, ep2++, ep++) { |
226 |
< |
if (ep2[1] < .5*ep2[0]) { |
227 |
< |
ep[0] -= .125*ep2[0]; |
228 |
< |
ep[1] += .125*ep2[0]; |
229 |
< |
} else if (ep2[1] > 2.*ep2[0]) { |
226 |
< |
ep[1] -= .125*ep2[1]; |
227 |
< |
ep[0] += .125*ep2[1]; |
228 |
< |
} |
229 |
< |
if (ep2[hp->ns] < .5*ep2[0]) { |
230 |
< |
ep[0] -= .125*ep2[0]; |
231 |
< |
ep[hp->ns] += .125*ep2[0]; |
232 |
< |
} else if (ep2[hp->ns] > 2.*ep2[0]) { |
233 |
< |
ep[hp->ns] -= .125*ep2[hp->ns]; |
234 |
< |
ep[0] += .125*ep2[hp->ns]; |
235 |
< |
} |
225 |
> |
ep2 = ep + hp->ns*hp->ns; |
226 |
> |
for (j = 0; j < hp->ns-1; j++, ep++, ep2++) { |
227 |
> |
ep[0] += .5*ep2[0] + .125*(ep2[1] + ep2[hp->ns]); |
228 |
> |
ep[1] += .125*ep2[0]; |
229 |
> |
ep[hp->ns] += .125*ep2[0]; |
230 |
|
} |
231 |
|
} |
238 |
– |
free(earr2); |
232 |
|
return(earr); |
233 |
|
} |
234 |
|
|
280 |
|
/* set number of divisions */ |
281 |
|
if (backside) wt = -wt; |
282 |
|
if (ambacc <= FTINY && |
283 |
< |
wt > (d *= 0.8*r->rweight/(ambdiv*minweight))) |
283 |
> |
wt > (d *= 0.8*r->rweight/(ambdiv*minweight + 1e-20))) |
284 |
|
wt = d; /* avoid ray termination */ |
285 |
|
n = sqrt(ambdiv * wt) + 0.5; |
286 |
|
i = 1 + (MINADIV-1)*(ambacc > FTINY); |
329 |
|
if (hp->sampOK <= MINADIV*MINADIV) |
330 |
|
return(hp); /* don't bother super-sampling */ |
331 |
|
n = ambssamp*wt + 0.5; |
332 |
< |
if (n > 8) { /* perform super-sampling? */ |
332 |
> |
if (n >= 4*hp->ns) { /* perform super-sampling? */ |
333 |
|
ambsupersamp(hp, n); |
334 |
|
copyscolor(rcol, hp->acol); |
335 |
|
} |