18 |
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|
19 |
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void |
20 |
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inithemi( /* initialize sampling hemisphere */ |
21 |
< |
register AMBHEMI *hp, |
21 |
> |
AMBHEMI *hp, |
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COLOR ac, |
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RAY *r, |
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double wt |
25 |
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) |
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{ |
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double d; |
28 |
< |
register int i; |
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> |
int i; |
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/* set number of divisions */ |
30 |
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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 |
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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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|
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int |
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divsample( /* sample a division */ |
61 |
< |
register AMBSAMP *dp, |
61 |
> |
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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> |
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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copycolor(ar.rcoef, h->acoef); |
78 |
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if (rayorigin(&ar, AMBIENT, r, ar.rcoef) < 0) |
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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 |
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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); |
98 |
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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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{ |
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const AMBSAMP *d1 = (const AMBSAMP *)p1; |
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const AMBSAMP *d2 = (const AMBSAMP *)p2; |
142 |
< |
register int c; |
142 |
> |
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 */ |
152 |
< |
COLOR acol, |
152 |
> |
COLOR rcol, |
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RAY *r, |
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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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{ |
159 |
< |
double b, d; |
159 |
> |
double b, d=0; |
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AMBHEMI hemi; |
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AMBSAMP *div; |
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AMBSAMP dnew; |
163 |
< |
register AMBSAMP *dp; |
163 |
> |
double acol[3]; |
164 |
> |
AMBSAMP *dp; |
165 |
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double arad; |
166 |
< |
int ndivs; |
167 |
< |
register int i, j; |
166 |
> |
int divcnt; |
167 |
> |
int i, j; |
168 |
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/* initialize hemisphere */ |
169 |
< |
inithemi(&hemi, acol, r, wt); |
170 |
< |
ndivs = hemi.nt * hemi.np; |
171 |
< |
/* initialize sum */ |
172 |
< |
setcolor(acol, 0.0, 0.0, 0.0); |
173 |
< |
if (ndivs == 0) |
169 |
> |
inithemi(&hemi, rcol, r, wt); |
170 |
> |
divcnt = hemi.nt * hemi.np; |
171 |
> |
/* initialize */ |
172 |
> |
if (pg != NULL) |
173 |
> |
pg[0] = pg[1] = pg[2] = 0.0; |
174 |
> |
if (dg != NULL) |
175 |
> |
dg[0] = dg[1] = dg[2] = 0.0; |
176 |
> |
setcolor(rcol, 0.0, 0.0, 0.0); |
177 |
> |
if (divcnt == 0) |
178 |
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return(0.0); |
179 |
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/* allocate super-samples */ |
180 |
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if (hemi.ns > 0 || pg != NULL || dg != NULL) { |
181 |
< |
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
181 |
> |
div = (AMBSAMP *)malloc(divcnt*sizeof(AMBSAMP)); |
182 |
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if (div == NULL) |
183 |
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error(SYSTEM, "out of memory in doambient"); |
184 |
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} else |
185 |
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div = NULL; |
186 |
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/* sample the divisions */ |
187 |
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arad = 0.0; |
188 |
+ |
acol[0] = acol[1] = acol[2] = 0.0; |
189 |
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if ((dp = div) == NULL) |
190 |
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dp = &dnew; |
191 |
+ |
divcnt = 0; |
192 |
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for (i = 0; i < hemi.nt; i++) |
193 |
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for (j = 0; j < hemi.np; j++) { |
194 |
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dp->t = i; dp->p = j; |
196 |
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dp->r = 0.0; |
197 |
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dp->n = 0; |
198 |
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if (divsample(dp, &hemi, r) < 0) { |
199 |
< |
if (div != NULL) dp++; |
199 |
> |
if (div != NULL) |
200 |
> |
dp++; |
201 |
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continue; |
202 |
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} |
203 |
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arad += dp->r; |
204 |
+ |
divcnt++; |
205 |
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if (div != NULL) |
206 |
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dp++; |
207 |
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else |
208 |
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addcolor(acol, dp->v); |
209 |
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} |
210 |
< |
if (hemi.ns > 0 && arad > FTINY && ndivs/arad < minarad) |
210 |
> |
if (!divcnt) { |
211 |
> |
if (div != NULL) |
212 |
> |
free((void *)div); |
213 |
> |
return(0.0); /* no samples taken */ |
214 |
> |
} |
215 |
> |
if (divcnt < hemi.nt*hemi.np) { |
216 |
> |
pg = dg = NULL; /* incomplete sampling */ |
217 |
> |
hemi.ns = 0; |
218 |
> |
} else if (arad > FTINY && divcnt/arad < minarad) { |
219 |
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hemi.ns = 0; /* close enough */ |
220 |
< |
else if (hemi.ns > 0) { /* else perform super-sampling */ |
220 |
> |
} else if (hemi.ns > 0) { /* else perform super-sampling? */ |
221 |
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comperrs(div, &hemi); /* compute errors */ |
222 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
222 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
223 |
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/* super-sample */ |
224 |
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for (i = hemi.ns; i > 0; i--) { |
225 |
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dnew = *div; |
228 |
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continue; |
229 |
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} |
230 |
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dp = div; /* reinsert */ |
231 |
< |
j = ndivs < i ? ndivs : i; |
231 |
> |
j = divcnt < i ? divcnt : i; |
232 |
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while (--j > 0 && dnew.k < dp[1].k) { |
233 |
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*dp = *(dp+1); |
234 |
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dp++; |
236 |
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*dp = dnew; |
237 |
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} |
238 |
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if (pg != NULL || dg != NULL) /* restore order */ |
239 |
< |
qsort(div, ndivs, sizeof(AMBSAMP), ambnorm); |
239 |
> |
qsort(div, divcnt, sizeof(AMBSAMP), ambnorm); |
240 |
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} |
241 |
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/* compute returned values */ |
242 |
|
if (div != NULL) { |
243 |
< |
arad = 0.0; |
244 |
< |
for (i = ndivs, dp = div; i-- > 0; dp++) { |
243 |
> |
arad = 0.0; /* note: divcnt may be < nt*np */ |
244 |
> |
for (i = hemi.nt*hemi.np, dp = div; i-- > 0; dp++) { |
245 |
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arad += dp->r; |
246 |
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if (dp->n > 1) { |
247 |
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b = 1.0/dp->n; |
253 |
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} |
254 |
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b = bright(acol); |
255 |
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if (b > FTINY) { |
256 |
< |
b = 1.0/b; /* normalize gradient(s) */ |
256 |
> |
b = 1.0/b; /* compute & normalize gradient(s) */ |
257 |
|
if (pg != NULL) { |
258 |
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posgradient(pg, div, &hemi); |
259 |
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for (i = 0; i < 3; i++) |
264 |
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for (i = 0; i < 3; i++) |
265 |
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dg[i] *= b; |
266 |
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} |
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; |
267 |
|
} |
268 |
|
free((void *)div); |
269 |
|
} |
270 |
+ |
copycolor(rcol, acol); |
271 |
|
if (arad <= FTINY) |
272 |
|
arad = maxarad; |
273 |
|
else |
274 |
< |
arad = (ndivs+hemi.ns)/arad; |
274 |
> |
arad = (divcnt+hemi.ns)/arad; |
275 |
|
if (pg != NULL) { /* reduce radius if gradient large */ |
276 |
|
d = DOT(pg,pg); |
277 |
|
if (d*arad*arad > 1.0) |
294 |
|
void |
295 |
|
comperrs( /* compute initial error estimates */ |
296 |
|
AMBSAMP *da, /* assumes standard ordering */ |
297 |
< |
register AMBHEMI *hp |
297 |
> |
AMBHEMI *hp |
298 |
|
) |
299 |
|
{ |
300 |
|
double b, b2; |
301 |
|
int i, j; |
302 |
< |
register AMBSAMP *dp; |
302 |
> |
AMBSAMP *dp; |
303 |
|
/* sum differences from neighbors */ |
304 |
|
dp = da; |
305 |
|
for (i = 0; i < hp->nt; i++) |
347 |
|
posgradient( /* compute position gradient */ |
348 |
|
FVECT gv, |
349 |
|
AMBSAMP *da, /* assumes standard ordering */ |
350 |
< |
register AMBHEMI *hp |
350 |
> |
AMBHEMI *hp |
351 |
|
) |
352 |
|
{ |
353 |
< |
register int i, j; |
353 |
> |
int i, j; |
354 |
|
double nextsine, lastsine, b, d; |
355 |
|
double mag0, mag1; |
356 |
|
double phi, cosp, sinp, xd, yd; |
357 |
< |
register AMBSAMP *dp; |
357 |
> |
AMBSAMP *dp; |
358 |
|
|
359 |
|
xd = yd = 0.0; |
360 |
|
for (j = 0; j < hp->np; j++) { |
405 |
|
dirgradient( /* compute direction gradient */ |
406 |
|
FVECT gv, |
407 |
|
AMBSAMP *da, /* assumes standard ordering */ |
408 |
< |
register AMBHEMI *hp |
408 |
> |
AMBHEMI *hp |
409 |
|
) |
410 |
|
{ |
411 |
< |
register int i, j; |
411 |
> |
int i, j; |
412 |
|
double mag; |
413 |
|
double phi, xd, yd; |
414 |
< |
register AMBSAMP *dp; |
414 |
> |
AMBSAMP *dp; |
415 |
|
|
416 |
|
xd = yd = 0.0; |
417 |
|
for (j = 0; j < hp->np; j++) { |