28 |
|
register int i; |
29 |
|
/* set number of divisions */ |
30 |
|
if (ambacc <= FTINY && |
31 |
< |
wt > (d = 0.8*bright(ac)*r->rweight/(ambdiv*minweight))) |
31 |
> |
wt > (d = 0.8*intens(ac)*r->rweight/(ambdiv*minweight))) |
32 |
|
wt = d; /* avoid ray termination */ |
33 |
|
hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
34 |
|
i = ambacc > FTINY ? 3 : 1; /* minimum number of samples */ |
77 |
|
copycolor(ar.rcoef, h->acoef); |
78 |
|
if (rayorigin(&ar, AMBIENT, r, ar.rcoef) < 0) |
79 |
|
return(-1); |
80 |
< |
if (ambacc > FTINY) |
81 |
< |
copycolor(ar.rcoef, h->acoef); |
80 |
> |
if (ambacc > FTINY) { |
81 |
> |
multcolor(ar.rcoef, h->acoef); |
82 |
> |
scalecolor(ar.rcoef, 1./AVGREFL); |
83 |
> |
} |
84 |
|
hlist[0] = r->rno; |
85 |
|
hlist[1] = dp->t; |
86 |
|
hlist[2] = dp->p; |
161 |
|
AMBSAMP dnew; |
162 |
|
register AMBSAMP *dp; |
163 |
|
double arad; |
164 |
< |
int ndivs; |
164 |
> |
int divcnt; |
165 |
|
register int i, j; |
166 |
|
/* initialize hemisphere */ |
167 |
|
inithemi(&hemi, acol, r, wt); |
168 |
< |
ndivs = hemi.nt * hemi.np; |
169 |
< |
/* initialize sum */ |
168 |
> |
divcnt = hemi.nt * hemi.np; |
169 |
> |
/* initialize */ |
170 |
> |
if (pg != NULL) |
171 |
> |
pg[0] = pg[1] = pg[2] = 0.0; |
172 |
> |
if (dg != NULL) |
173 |
> |
dg[0] = dg[1] = dg[2] = 0.0; |
174 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
175 |
< |
if (ndivs == 0) |
175 |
> |
if (divcnt == 0) |
176 |
|
return(0.0); |
177 |
|
/* allocate super-samples */ |
178 |
|
if (hemi.ns > 0 || pg != NULL || dg != NULL) { |
179 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
179 |
> |
div = (AMBSAMP *)malloc(divcnt*sizeof(AMBSAMP)); |
180 |
|
if (div == NULL) |
181 |
|
error(SYSTEM, "out of memory in doambient"); |
182 |
|
} else |
185 |
|
arad = 0.0; |
186 |
|
if ((dp = div) == NULL) |
187 |
|
dp = &dnew; |
188 |
+ |
divcnt = 0; |
189 |
|
for (i = 0; i < hemi.nt; i++) |
190 |
|
for (j = 0; j < hemi.np; j++) { |
191 |
|
dp->t = i; dp->p = j; |
193 |
|
dp->r = 0.0; |
194 |
|
dp->n = 0; |
195 |
|
if (divsample(dp, &hemi, r) < 0) { |
196 |
< |
if (div != NULL) dp++; |
196 |
> |
if (div != NULL) |
197 |
> |
dp++; |
198 |
|
continue; |
199 |
|
} |
200 |
|
arad += dp->r; |
201 |
+ |
divcnt++; |
202 |
|
if (div != NULL) |
203 |
|
dp++; |
204 |
|
else |
205 |
|
addcolor(acol, dp->v); |
206 |
|
} |
207 |
< |
if (hemi.ns > 0 && arad > FTINY && ndivs/arad < minarad) |
207 |
> |
if (!divcnt) |
208 |
> |
return(0.0); /* no samples taken */ |
209 |
> |
if (divcnt < hemi.nt*hemi.np) { |
210 |
> |
pg = dg = NULL; /* incomplete sampling */ |
211 |
> |
hemi.ns = 0; |
212 |
> |
} else if (arad > FTINY && divcnt/arad < minarad) { |
213 |
|
hemi.ns = 0; /* close enough */ |
214 |
< |
else if (hemi.ns > 0) { /* else perform super-sampling */ |
214 |
> |
} else if (hemi.ns > 0) { /* else perform super-sampling? */ |
215 |
|
comperrs(div, &hemi); /* compute errors */ |
216 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
216 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
217 |
|
/* super-sample */ |
218 |
|
for (i = hemi.ns; i > 0; i--) { |
219 |
|
dnew = *div; |
222 |
|
continue; |
223 |
|
} |
224 |
|
dp = div; /* reinsert */ |
225 |
< |
j = ndivs < i ? ndivs : i; |
225 |
> |
j = divcnt < i ? divcnt : i; |
226 |
|
while (--j > 0 && dnew.k < dp[1].k) { |
227 |
|
*dp = *(dp+1); |
228 |
|
dp++; |
230 |
|
*dp = dnew; |
231 |
|
} |
232 |
|
if (pg != NULL || dg != NULL) /* restore order */ |
233 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambnorm); |
233 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambnorm); |
234 |
|
} |
235 |
|
/* compute returned values */ |
236 |
|
if (div != NULL) { |
237 |
< |
arad = 0.0; |
238 |
< |
for (i = ndivs, dp = div; i-- > 0; dp++) { |
237 |
> |
arad = 0.0; /* note: divcnt may be < nt*np */ |
238 |
> |
for (i = hemi.nt*hemi.np, dp = div; i-- > 0; dp++) { |
239 |
|
arad += dp->r; |
240 |
|
if (dp->n > 1) { |
241 |
|
b = 1.0/dp->n; |
247 |
|
} |
248 |
|
b = bright(acol); |
249 |
|
if (b > FTINY) { |
250 |
< |
b = 1.0/b; /* normalize gradient(s) */ |
250 |
> |
b = 1.0/b; /* compute & normalize gradient(s) */ |
251 |
|
if (pg != NULL) { |
252 |
|
posgradient(pg, div, &hemi); |
253 |
|
for (i = 0; i < 3; i++) |
258 |
|
for (i = 0; i < 3; i++) |
259 |
|
dg[i] *= b; |
260 |
|
} |
247 |
– |
} else { |
248 |
– |
if (pg != NULL) |
249 |
– |
for (i = 0; i < 3; i++) |
250 |
– |
pg[i] = 0.0; |
251 |
– |
if (dg != NULL) |
252 |
– |
for (i = 0; i < 3; i++) |
253 |
– |
dg[i] = 0.0; |
261 |
|
} |
262 |
|
free((void *)div); |
263 |
|
} |
264 |
|
if (arad <= FTINY) |
265 |
|
arad = maxarad; |
266 |
|
else |
267 |
< |
arad = (ndivs+hemi.ns)/arad; |
267 |
> |
arad = (divcnt+hemi.ns)/arad; |
268 |
|
if (pg != NULL) { /* reduce radius if gradient large */ |
269 |
|
d = DOT(pg,pg); |
270 |
|
if (d*arad*arad > 1.0) |