17 |
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typedef struct { |
18 |
|
short t, p; /* theta, phi indices */ |
19 |
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COLOR v; /* value sum */ |
20 |
< |
float k; /* error contribution for this division */ |
20 |
> |
float r; /* 1/distance sum */ |
21 |
> |
float k; /* variance for this division */ |
22 |
|
int n; /* number of subsamples */ |
23 |
< |
} AMBSAMP; /* ambient division sample */ |
23 |
> |
} AMBSAMP; /* ambient sample division */ |
24 |
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|
25 |
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typedef struct { |
26 |
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FVECT ux, uy, uz; /* x, y and z axis directions */ |
54 |
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} |
55 |
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|
56 |
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|
57 |
< |
static double |
57 |
> |
double |
58 |
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divsample(dp, h, r) /* sample a division */ |
59 |
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register AMBSAMP *dp; |
60 |
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AMBHEMI *h; |
65 |
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double xd, yd, zd; |
66 |
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double b2; |
67 |
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double phi; |
68 |
< |
register int k; |
68 |
> |
register int i; |
69 |
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|
70 |
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if (rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
71 |
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return(0.0); |
79 |
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xd = cos(phi) * zd; |
80 |
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yd = sin(phi) * zd; |
81 |
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zd = sqrt(1.0 - zd*zd); |
82 |
< |
for (k = 0; k < 3; k++) |
83 |
< |
ar.rdir[k] = xd*h->ux[k] + |
84 |
< |
yd*h->uy[k] + |
85 |
< |
zd*h->uz[k]; |
86 |
< |
dimlist[ndims++] = dp->t*h->np + dp->p + 38813; |
82 |
> |
for (i = 0; i < 3; i++) |
83 |
> |
ar.rdir[i] = xd*h->ux[i] + |
84 |
> |
yd*h->uy[i] + |
85 |
> |
zd*h->uz[i]; |
86 |
> |
dimlist[ndims++] = dp->t*h->np + dp->p + 90171; |
87 |
|
rayvalue(&ar); |
88 |
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ndims--; |
89 |
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addcolor(dp->v, ar.rcol); |
90 |
+ |
if (ar.rot < FHUGE) |
91 |
+ |
dp->r += 1.0/ar.rot; |
92 |
|
/* (re)initialize error */ |
93 |
|
if (dp->n++) { |
94 |
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b2 = bright(dp->v)/dp->n - bright(ar.rcol); |
137 |
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for (j = 0; j < hemi.np; j++) { |
138 |
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dp->t = i; dp->p = j; |
139 |
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setcolor(dp->v, 0.0, 0.0, 0.0); |
140 |
+ |
dp->r = 0.0; |
141 |
|
dp->n = 0; |
142 |
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if ((d = divsample(dp, &hemi, r)) == 0.0) |
143 |
|
goto oopsy; |
140 |
– |
if (d < FHUGE) |
141 |
– |
arad += 1.0 / d; |
144 |
|
if (div != NULL) |
145 |
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dp++; |
146 |
< |
else |
146 |
> |
else { |
147 |
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addcolor(acol, dp->v); |
148 |
+ |
arad += dp->r; |
149 |
+ |
} |
150 |
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} |
151 |
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if (ns > 0) { /* perform super-sampling */ |
152 |
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comperrs(div, hemi); /* compute errors */ |
155 |
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for (i = ndivs; i > ns; i--) { |
156 |
|
dp--; |
157 |
|
addcolor(acol, dp->v); |
158 |
+ |
arad += dp->r; |
159 |
|
} |
160 |
|
/* super-sample */ |
161 |
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for (i = ns; i > 0; i--) { |
175 |
|
/* extract darkest */ |
176 |
|
if (i <= ndivs) { |
177 |
|
dp = div + i-1; |
178 |
+ |
arad += dp->r; |
179 |
|
if (dp->n > 1) { |
180 |
|
b = 1.0/dp->n; |
181 |
|
scalecolor(dp->v, b); |
182 |
+ |
dp->r *= b; |
183 |
|
dp->n = 1; |
184 |
|
} |
185 |
|
addcolor(acol, dp->v); |
186 |
|
} |
187 |
|
} |
188 |
< |
if (pg != NULL || dg != NULL) /* reorder */ |
188 |
> |
if (pg != NULL || dg != NULL) /* restore order */ |
189 |
|
qsort(div, ndivs, sizeof(AMBSAMP), ambnorm); |
190 |
|
} |
191 |
|
/* compute returned values */ |
218 |
|
register AMBHEMI *hp; |
219 |
|
RAY *r; |
220 |
|
{ |
221 |
< |
register int k; |
221 |
> |
register int i; |
222 |
|
/* set number of divisions */ |
223 |
|
hp->nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
224 |
|
hp->np = 2 * hp->nt; |
225 |
|
/* make axes */ |
226 |
|
VCOPY(hp->uz, r->ron); |
227 |
|
hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0; |
228 |
< |
for (k = 0; k < 3; k++) |
229 |
< |
if (hp->uz[k] < 0.6 && hp->uz[k] > -0.6) |
228 |
> |
for (i = 0; i < 3; i++) |
229 |
> |
if (hp->uz[i] < 0.6 && hp->uz[i] > -0.6) |
230 |
|
break; |
231 |
< |
if (k >= 3) |
231 |
> |
if (i >= 3) |
232 |
|
error(CONSISTENCY, "bad ray direction in inithemi"); |
233 |
< |
hp->uy[k] = 1.0; |
233 |
> |
hp->uy[i] = 1.0; |
234 |
|
fcross(hp->ux, hp->uz, hp->uy); |
235 |
|
normalize(hp->ux); |
236 |
|
fcross(hp->uy, hp->ux, hp->uz); |
238 |
|
|
239 |
|
|
240 |
|
comperrs(da, hp) /* compute initial error estimates */ |
241 |
< |
AMBSAMP *da; |
241 |
> |
AMBSAMP *da; /* assumes standard ordering */ |
242 |
|
register AMBHEMI *hp; |
243 |
|
{ |
244 |
|
double b, b2; |
285 |
|
|
286 |
|
posgradient(gv, da, hp) /* compute position gradient */ |
287 |
|
FVECT gv; |
288 |
< |
AMBSAMP *da; |
288 |
> |
AMBSAMP *da; /* assumes standard ordering */ |
289 |
|
AMBHEMI *hp; |
290 |
|
{ |
291 |
< |
gv[0] = 0.0; gv[1] = 0.0; gv[2] = 0.0; |
291 |
> |
register int i, j; |
292 |
> |
double b, d; |
293 |
> |
double mag0, mag1; |
294 |
> |
double phi, cosp, sinp, xd, yd; |
295 |
> |
register AMBSAMP *dp; |
296 |
> |
|
297 |
> |
xd = yd = 0.0; |
298 |
> |
for (j = 0; j < hp->np; j++) { |
299 |
> |
dp = da + j; |
300 |
> |
mag0 = mag1 = 0.0; |
301 |
> |
for (i = 0; i < hp->nt; i++) { |
302 |
> |
#ifdef DEBUG |
303 |
> |
if (dp->t != i || dp->p != j) |
304 |
> |
error(CONSISTENCY, |
305 |
> |
"division order in posgradient"); |
306 |
> |
#endif |
307 |
> |
b = bright(dp->v); |
308 |
> |
if (i > 0) { |
309 |
> |
d = dp[-hp->np].r; |
310 |
> |
if (dp[0].r > d) d = dp[0].r; |
311 |
> |
d *= 1.0 - sqrt((double)i/hp->nt); |
312 |
> |
mag0 += d*(b - bright(dp[-hp->np].v)); |
313 |
> |
} |
314 |
> |
if (j > 0) { |
315 |
> |
d = dp[-1].r; |
316 |
> |
if (dp[0].r > d) d = dp[0].r; |
317 |
> |
mag1 += d*(b - bright(dp[-1].v)); |
318 |
> |
} else { |
319 |
> |
d = dp[hp->np-1].r; |
320 |
> |
if (dp[0].r > d) d = dp[0].r; |
321 |
> |
mag1 += d*(b - bright(dp[hp->np-1].v)); |
322 |
> |
} |
323 |
> |
dp += hp->np; |
324 |
> |
} |
325 |
> |
if (hp->nt > 1) { |
326 |
> |
mag0 /= (double)(hp->nt-1); |
327 |
> |
mag1 /= (double)hp->nt; |
328 |
> |
} |
329 |
> |
phi = 2.0*PI * (double)j/hp->np; |
330 |
> |
cosp = cos(phi); sinp = sin(phi); |
331 |
> |
xd += mag0*cosp - mag1*sinp; |
332 |
> |
yd += mag0*sinp + mag1*cosp; |
333 |
> |
} |
334 |
> |
for (i = 0; i < 3; i++) |
335 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/hp->np; |
336 |
|
} |
337 |
|
|
338 |
|
|
339 |
|
dirgradient(gv, da, hp) /* compute direction gradient */ |
340 |
|
FVECT gv; |
341 |
< |
AMBSAMP *da; |
341 |
> |
AMBSAMP *da; /* assumes standard ordering */ |
342 |
|
AMBHEMI *hp; |
343 |
|
{ |
344 |
< |
gv[0] = 0.0; gv[1] = 0.0; gv[2] = 0.0; |
344 |
> |
register int i, j; |
345 |
> |
double mag; |
346 |
> |
double phi, xd, yd; |
347 |
> |
register AMBSAMP *dp; |
348 |
> |
|
349 |
> |
xd = yd = 0.0; |
350 |
> |
for (j = 0; j < hp->np; j++) { |
351 |
> |
dp = da + j; |
352 |
> |
mag = 0.0; |
353 |
> |
for (i = 0; i < hp->nt; i++) { |
354 |
> |
#ifdef DEBUG |
355 |
> |
if (dp->t != i || dp->p != j) |
356 |
> |
error(CONSISTENCY, |
357 |
> |
"division order in dirgradient"); |
358 |
> |
#endif |
359 |
> |
mag += sqrt((i+.5)/hp->nt)*bright(dp->v); |
360 |
> |
dp += hp->np; |
361 |
> |
} |
362 |
> |
phi = 2.0*PI * (j+.5)/hp->np + PI/2.0; |
363 |
> |
xd += mag * cos(phi); |
364 |
> |
yd += mag * sin(phi); |
365 |
> |
} |
366 |
> |
for (i = 0; i < 3; i++) |
367 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/(hp->nt*hp->np); |
368 |
|
} |