1 |
– |
/* Copyright (c) 1991 Regents of the University of California */ |
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– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* Routines to compute "ambient" values using Monte Carlo |
6 |
+ |
* |
7 |
+ |
* Declarations of external symbols in ambient.h |
8 |
|
*/ |
9 |
|
|
10 |
+ |
/* ==================================================================== |
11 |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
17 |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
21 |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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+ |
* |
28 |
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* 3. The end-user documentation included with the redistribution, |
29 |
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* if any, must include the following acknowledgment: |
30 |
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* "This product includes Radiance software |
31 |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
39 |
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* not be used to endorse or promote products derived from this |
40 |
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* software without prior written permission. For written |
41 |
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* permission, please contact [email protected]. |
42 |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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+ |
* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
51 |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
52 |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
59 |
+ |
* ==================================================================== |
60 |
+ |
* |
61 |
+ |
* This software consists of voluntary contributions made by many |
62 |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
63 |
+ |
* information on Lawrence Berkeley National Laboratory, please see |
64 |
+ |
* <http://www.lbl.gov/>. |
65 |
+ |
*/ |
66 |
+ |
|
67 |
|
#include "ray.h" |
68 |
|
|
69 |
|
#include "ambient.h" |
70 |
|
|
71 |
|
#include "random.h" |
72 |
|
|
17 |
– |
typedef struct { |
18 |
– |
short t, p; /* theta, phi indices */ |
19 |
– |
COLOR v; /* value sum */ |
20 |
– |
float k; /* error contribution for this division */ |
21 |
– |
int n; /* number of subsamples */ |
22 |
– |
} AMBSAMP; /* ambient division sample */ |
73 |
|
|
24 |
– |
typedef struct { |
25 |
– |
FVECT ux, uy, uz; /* x, y and z axis directions */ |
26 |
– |
short nt, np; /* number of theta and phi directions */ |
27 |
– |
} AMBHEMI; /* ambient sample hemisphere */ |
28 |
– |
|
29 |
– |
extern double sin(), cos(), sqrt(); |
30 |
– |
|
31 |
– |
|
74 |
|
static int |
75 |
|
ambcmp(d1, d2) /* decreasing order */ |
76 |
|
AMBSAMP *d1, *d2; |
95 |
|
} |
96 |
|
|
97 |
|
|
98 |
< |
static double |
98 |
> |
int |
99 |
|
divsample(dp, h, r) /* sample a division */ |
100 |
|
register AMBSAMP *dp; |
101 |
|
AMBHEMI *h; |
102 |
|
RAY *r; |
103 |
|
{ |
104 |
|
RAY ar; |
105 |
< |
int hlist[4]; |
105 |
> |
int hlist[3]; |
106 |
> |
double spt[2]; |
107 |
|
double xd, yd, zd; |
108 |
|
double b2; |
109 |
|
double phi; |
110 |
< |
register int k; |
110 |
> |
register int i; |
111 |
|
|
112 |
< |
if (rayorigin(&ar, r, AMBIENT, 0.5) < 0) |
113 |
< |
return(0.0); |
112 |
> |
if (rayorigin(&ar, r, AMBIENT, AVGREFL) < 0) |
113 |
> |
return(-1); |
114 |
|
hlist[0] = r->rno; |
115 |
|
hlist[1] = dp->t; |
116 |
|
hlist[2] = dp->p; |
117 |
< |
hlist[3] = 0; |
118 |
< |
zd = sqrt((dp->t+urand(ilhash(hlist,4)+dp->n))/h->nt); |
119 |
< |
hlist[3] = 1; |
120 |
< |
phi = 2.0*PI * (dp->p+urand(ilhash(hlist,4)+dp->n))/h->np; |
121 |
< |
xd = cos(phi) * zd; |
79 |
< |
yd = sin(phi) * zd; |
117 |
> |
multisamp(spt, 2, urand(ilhash(hlist,3)+dp->n)); |
118 |
> |
zd = sqrt((dp->t + spt[0])/h->nt); |
119 |
> |
phi = 2.0*PI * (dp->p + spt[1])/h->np; |
120 |
> |
xd = tcos(phi) * zd; |
121 |
> |
yd = tsin(phi) * zd; |
122 |
|
zd = sqrt(1.0 - zd*zd); |
123 |
< |
for (k = 0; k < 3; k++) |
124 |
< |
ar.rdir[k] = xd*h->ux[k] + |
125 |
< |
yd*h->uy[k] + |
126 |
< |
zd*h->uz[k]; |
127 |
< |
dimlist[ndims++] = dp->t*h->np + dp->p + 38813; |
123 |
> |
for (i = 0; i < 3; i++) |
124 |
> |
ar.rdir[i] = xd*h->ux[i] + |
125 |
> |
yd*h->uy[i] + |
126 |
> |
zd*h->uz[i]; |
127 |
> |
dimlist[ndims++] = dp->t*h->np + dp->p + 90171; |
128 |
|
rayvalue(&ar); |
129 |
|
ndims--; |
130 |
|
addcolor(dp->v, ar.rcol); |
131 |
+ |
/* use rt to improve gradient calc */ |
132 |
+ |
if (ar.rt > FTINY && ar.rt < FHUGE) |
133 |
+ |
dp->r += 1.0/ar.rt; |
134 |
|
/* (re)initialize error */ |
135 |
|
if (dp->n++) { |
136 |
|
b2 = bright(dp->v)/dp->n - bright(ar.rcol); |
138 |
|
dp->k = b2/(dp->n*dp->n); |
139 |
|
} else |
140 |
|
dp->k = 0.0; |
141 |
< |
return(ar.rot); |
141 |
> |
return(0); |
142 |
|
} |
143 |
|
|
144 |
|
|
145 |
|
double |
146 |
< |
doambient(acol, r, pg, dg) /* compute ambient component */ |
146 |
> |
doambient(acol, r, wt, pg, dg) /* compute ambient component */ |
147 |
|
COLOR acol; |
148 |
|
RAY *r; |
149 |
+ |
double wt; |
150 |
|
FVECT pg, dg; |
151 |
|
{ |
152 |
|
double b, d; |
160 |
|
/* initialize color */ |
161 |
|
setcolor(acol, 0.0, 0.0, 0.0); |
162 |
|
/* initialize hemisphere */ |
163 |
< |
inithemi(&hemi, r); |
163 |
> |
inithemi(&hemi, r, wt); |
164 |
|
ndivs = hemi.nt * hemi.np; |
165 |
|
if (ndivs == 0) |
166 |
|
return(0.0); |
167 |
|
/* set number of super-samples */ |
168 |
< |
ns = ambssamp * r->rweight + 0.5; |
168 |
> |
ns = ambssamp * wt + 0.5; |
169 |
|
if (ns > 0 || pg != NULL || dg != NULL) { |
170 |
|
div = (AMBSAMP *)malloc(ndivs*sizeof(AMBSAMP)); |
171 |
|
if (div == NULL) |
180 |
|
for (j = 0; j < hemi.np; j++) { |
181 |
|
dp->t = i; dp->p = j; |
182 |
|
setcolor(dp->v, 0.0, 0.0, 0.0); |
183 |
+ |
dp->r = 0.0; |
184 |
|
dp->n = 0; |
185 |
< |
if ((d = divsample(dp, &hemi, r)) == 0.0) |
185 |
> |
if (divsample(dp, &hemi, r) < 0) |
186 |
|
goto oopsy; |
187 |
< |
if (d < FHUGE) |
141 |
< |
arad += 1.0 / d; |
187 |
> |
arad += dp->r; |
188 |
|
if (div != NULL) |
189 |
|
dp++; |
190 |
|
else |
191 |
|
addcolor(acol, dp->v); |
192 |
|
} |
193 |
< |
if (ns > 0) { /* perform super-sampling */ |
194 |
< |
comperrs(div, hemi); /* compute errors */ |
193 |
> |
if (ns > 0 && arad > FTINY && ndivs/arad < minarad) |
194 |
> |
ns = 0; /* close enough */ |
195 |
> |
else if (ns > 0) { /* else perform super-sampling */ |
196 |
> |
comperrs(div, &hemi); /* compute errors */ |
197 |
|
qsort(div, ndivs, sizeof(AMBSAMP), ambcmp); /* sort divs */ |
150 |
– |
dp = div + ndivs; /* skim excess */ |
151 |
– |
for (i = ndivs; i > ns; i--) { |
152 |
– |
dp--; |
153 |
– |
addcolor(acol, dp->v); |
154 |
– |
} |
198 |
|
/* super-sample */ |
199 |
|
for (i = ns; i > 0; i--) { |
200 |
|
copystruct(&dnew, div); |
201 |
< |
if ((d = divsample(&dnew, &hemi)) == 0.0) |
201 |
> |
if (divsample(&dnew, &hemi, r) < 0) |
202 |
|
goto oopsy; |
160 |
– |
if (d < FHUGE) |
161 |
– |
arad += 1.0 / d; |
203 |
|
/* reinsert */ |
204 |
|
dp = div; |
205 |
|
j = ndivs < i ? ndivs : i; |
208 |
|
dp++; |
209 |
|
} |
210 |
|
copystruct(dp, &dnew); |
170 |
– |
/* extract darkest */ |
171 |
– |
if (i <= ndivs) { |
172 |
– |
dp = div + i-1; |
173 |
– |
if (dp->n > 1) { |
174 |
– |
b = 1.0/dp->n; |
175 |
– |
scalecolor(dp->v, b); |
176 |
– |
dp->n = 1; |
177 |
– |
} |
178 |
– |
addcolor(acol, dp->v); |
179 |
– |
} |
211 |
|
} |
212 |
< |
if (pg != NULL || dg != NULL) /* reorder */ |
212 |
> |
if (pg != NULL || dg != NULL) /* restore order */ |
213 |
|
qsort(div, ndivs, sizeof(AMBSAMP), ambnorm); |
214 |
|
} |
215 |
|
/* compute returned values */ |
216 |
< |
if (pg != NULL) |
217 |
< |
posgradient(pg, div, &hemi); |
218 |
< |
if (dg != NULL) |
219 |
< |
dirgradient(dg, div, &hemi); |
220 |
< |
if (div != NULL) |
221 |
< |
free((char *)div); |
216 |
> |
if (div != NULL) { |
217 |
> |
arad = 0.0; |
218 |
> |
for (i = ndivs, dp = div; i-- > 0; dp++) { |
219 |
> |
arad += dp->r; |
220 |
> |
if (dp->n > 1) { |
221 |
> |
b = 1.0/dp->n; |
222 |
> |
scalecolor(dp->v, b); |
223 |
> |
dp->r *= b; |
224 |
> |
dp->n = 1; |
225 |
> |
} |
226 |
> |
addcolor(acol, dp->v); |
227 |
> |
} |
228 |
> |
b = bright(acol); |
229 |
> |
if (b > FTINY) { |
230 |
> |
b = ndivs/b; |
231 |
> |
if (pg != NULL) { |
232 |
> |
posgradient(pg, div, &hemi); |
233 |
> |
for (i = 0; i < 3; i++) |
234 |
> |
pg[i] *= b; |
235 |
> |
} |
236 |
> |
if (dg != NULL) { |
237 |
> |
dirgradient(dg, div, &hemi); |
238 |
> |
for (i = 0; i < 3; i++) |
239 |
> |
dg[i] *= b; |
240 |
> |
} |
241 |
> |
} else { |
242 |
> |
if (pg != NULL) |
243 |
> |
for (i = 0; i < 3; i++) |
244 |
> |
pg[i] = 0.0; |
245 |
> |
if (dg != NULL) |
246 |
> |
for (i = 0; i < 3; i++) |
247 |
> |
dg[i] = 0.0; |
248 |
> |
} |
249 |
> |
free((void *)div); |
250 |
> |
} |
251 |
|
b = 1.0/ndivs; |
252 |
|
scalecolor(acol, b); |
253 |
|
if (arad <= FTINY) |
254 |
< |
arad = FHUGE; |
254 |
> |
arad = maxarad; |
255 |
|
else |
256 |
|
arad = (ndivs+ns)/arad; |
257 |
< |
if (arad > maxarad) |
258 |
< |
arad = maxarad; |
259 |
< |
else if (arad < minarad) |
257 |
> |
if (pg != NULL) { /* reduce radius if gradient large */ |
258 |
> |
d = DOT(pg,pg); |
259 |
> |
if (d*arad*arad > 1.0) |
260 |
> |
arad = 1.0/sqrt(d); |
261 |
> |
} |
262 |
> |
if (arad < minarad) { |
263 |
|
arad = minarad; |
264 |
< |
arad /= sqrt(r->rweight); |
264 |
> |
if (pg != NULL && d*arad*arad > 1.0) { /* cap gradient */ |
265 |
> |
d = 1.0/arad/sqrt(d); |
266 |
> |
for (i = 0; i < 3; i++) |
267 |
> |
pg[i] *= d; |
268 |
> |
} |
269 |
> |
} |
270 |
> |
if ((arad /= sqrt(wt)) > maxarad) |
271 |
> |
arad = maxarad; |
272 |
|
return(arad); |
273 |
|
oopsy: |
274 |
|
if (div != NULL) |
275 |
< |
free((char *)div); |
275 |
> |
free((void *)div); |
276 |
|
return(0.0); |
277 |
|
} |
278 |
|
|
279 |
|
|
280 |
< |
inithemi(hp, r) /* initialize sampling hemisphere */ |
280 |
> |
void |
281 |
> |
inithemi(hp, r, wt) /* initialize sampling hemisphere */ |
282 |
|
register AMBHEMI *hp; |
283 |
|
RAY *r; |
284 |
+ |
double wt; |
285 |
|
{ |
286 |
< |
register int k; |
286 |
> |
register int i; |
287 |
|
/* set number of divisions */ |
288 |
< |
hp->nt = sqrt(ambdiv * r->rweight * 0.5) + 0.5; |
289 |
< |
hp->np = 2 * hp->nt; |
288 |
> |
if (wt < (.25*PI)/ambdiv+FTINY) { |
289 |
> |
hp->nt = hp->np = 0; |
290 |
> |
return; /* zero samples */ |
291 |
> |
} |
292 |
> |
hp->nt = sqrt(ambdiv * wt / PI) + 0.5; |
293 |
> |
hp->np = PI * hp->nt + 0.5; |
294 |
|
/* make axes */ |
295 |
|
VCOPY(hp->uz, r->ron); |
296 |
|
hp->uy[0] = hp->uy[1] = hp->uy[2] = 0.0; |
297 |
< |
for (k = 0; k < 3; k++) |
298 |
< |
if (hp->uz[k] < 0.6 && hp->uz[k] > -0.6) |
297 |
> |
for (i = 0; i < 3; i++) |
298 |
> |
if (hp->uz[i] < 0.6 && hp->uz[i] > -0.6) |
299 |
|
break; |
300 |
< |
if (k >= 3) |
300 |
> |
if (i >= 3) |
301 |
|
error(CONSISTENCY, "bad ray direction in inithemi"); |
302 |
< |
hp->uy[k] = 1.0; |
303 |
< |
fcross(hp->ux, hp->uz, hp->uy); |
302 |
> |
hp->uy[i] = 1.0; |
303 |
> |
fcross(hp->ux, hp->uy, hp->uz); |
304 |
|
normalize(hp->ux); |
305 |
< |
fcross(hp->uy, hp->ux, hp->uz); |
305 |
> |
fcross(hp->uy, hp->uz, hp->ux); |
306 |
|
} |
307 |
|
|
308 |
|
|
309 |
+ |
void |
310 |
|
comperrs(da, hp) /* compute initial error estimates */ |
311 |
< |
AMBSAMP *da; |
311 |
> |
AMBSAMP *da; /* assumes standard ordering */ |
312 |
|
register AMBHEMI *hp; |
313 |
|
{ |
314 |
|
double b, b2; |
318 |
|
dp = da; |
319 |
|
for (i = 0; i < hp->nt; i++) |
320 |
|
for (j = 0; j < hp->np; j++) { |
321 |
+ |
#ifdef DEBUG |
322 |
+ |
if (dp->t != i || dp->p != j) |
323 |
+ |
error(CONSISTENCY, |
324 |
+ |
"division order in comperrs"); |
325 |
+ |
#endif |
326 |
|
b = bright(dp[0].v); |
327 |
|
if (i > 0) { /* from above */ |
328 |
|
b2 = bright(dp[-hp->np].v) - b; |
335 |
|
b2 *= b2 * 0.25; |
336 |
|
dp[0].k += b2; |
337 |
|
dp[-1].k += b2; |
338 |
< |
} |
339 |
< |
if (j == hp->np-1) { /* around */ |
258 |
< |
b2 = bright(dp[-(hp->np-1)].v) - b; |
338 |
> |
} else { /* around */ |
339 |
> |
b2 = bright(dp[hp->np-1].v) - b; |
340 |
|
b2 *= b2 * 0.25; |
341 |
|
dp[0].k += b2; |
342 |
< |
dp[-(hp->np-1)].k += b2; |
342 |
> |
dp[hp->np-1].k += b2; |
343 |
|
} |
344 |
|
dp++; |
345 |
|
} |
357 |
|
} |
358 |
|
|
359 |
|
|
360 |
+ |
void |
361 |
|
posgradient(gv, da, hp) /* compute position gradient */ |
362 |
|
FVECT gv; |
363 |
< |
AMBSAMP *da; |
364 |
< |
AMBHEMI *hp; |
363 |
> |
AMBSAMP *da; /* assumes standard ordering */ |
364 |
> |
register AMBHEMI *hp; |
365 |
|
{ |
366 |
< |
gv[0] = 0.0; gv[1] = 0.0; gv[2] = 0.0; |
366 |
> |
register int i, j; |
367 |
> |
double nextsine, lastsine, b, d; |
368 |
> |
double mag0, mag1; |
369 |
> |
double phi, cosp, sinp, xd, yd; |
370 |
> |
register AMBSAMP *dp; |
371 |
> |
|
372 |
> |
xd = yd = 0.0; |
373 |
> |
for (j = 0; j < hp->np; j++) { |
374 |
> |
dp = da + j; |
375 |
> |
mag0 = mag1 = 0.0; |
376 |
> |
lastsine = 0.0; |
377 |
> |
for (i = 0; i < hp->nt; i++) { |
378 |
> |
#ifdef DEBUG |
379 |
> |
if (dp->t != i || dp->p != j) |
380 |
> |
error(CONSISTENCY, |
381 |
> |
"division order in posgradient"); |
382 |
> |
#endif |
383 |
> |
b = bright(dp->v); |
384 |
> |
if (i > 0) { |
385 |
> |
d = dp[-hp->np].r; |
386 |
> |
if (dp[0].r > d) d = dp[0].r; |
387 |
> |
/* sin(t)*cos(t)^2 */ |
388 |
> |
d *= lastsine * (1.0 - (double)i/hp->nt); |
389 |
> |
mag0 += d*(b - bright(dp[-hp->np].v)); |
390 |
> |
} |
391 |
> |
nextsine = sqrt((double)(i+1)/hp->nt); |
392 |
> |
if (j > 0) { |
393 |
> |
d = dp[-1].r; |
394 |
> |
if (dp[0].r > d) d = dp[0].r; |
395 |
> |
mag1 += d * (nextsine - lastsine) * |
396 |
> |
(b - bright(dp[-1].v)); |
397 |
> |
} else { |
398 |
> |
d = dp[hp->np-1].r; |
399 |
> |
if (dp[0].r > d) d = dp[0].r; |
400 |
> |
mag1 += d * (nextsine - lastsine) * |
401 |
> |
(b - bright(dp[hp->np-1].v)); |
402 |
> |
} |
403 |
> |
dp += hp->np; |
404 |
> |
lastsine = nextsine; |
405 |
> |
} |
406 |
> |
mag0 *= 2.0*PI / hp->np; |
407 |
> |
phi = 2.0*PI * (double)j/hp->np; |
408 |
> |
cosp = tcos(phi); sinp = tsin(phi); |
409 |
> |
xd += mag0*cosp - mag1*sinp; |
410 |
> |
yd += mag0*sinp + mag1*cosp; |
411 |
> |
} |
412 |
> |
for (i = 0; i < 3; i++) |
413 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/PI; |
414 |
|
} |
415 |
|
|
416 |
|
|
417 |
+ |
void |
418 |
|
dirgradient(gv, da, hp) /* compute direction gradient */ |
419 |
|
FVECT gv; |
420 |
< |
AMBSAMP *da; |
421 |
< |
AMBHEMI *hp; |
420 |
> |
AMBSAMP *da; /* assumes standard ordering */ |
421 |
> |
register AMBHEMI *hp; |
422 |
|
{ |
423 |
< |
gv[0] = 0.0; gv[1] = 0.0; gv[2] = 0.0; |
423 |
> |
register int i, j; |
424 |
> |
double mag; |
425 |
> |
double phi, xd, yd; |
426 |
> |
register AMBSAMP *dp; |
427 |
> |
|
428 |
> |
xd = yd = 0.0; |
429 |
> |
for (j = 0; j < hp->np; j++) { |
430 |
> |
dp = da + j; |
431 |
> |
mag = 0.0; |
432 |
> |
for (i = 0; i < hp->nt; i++) { |
433 |
> |
#ifdef DEBUG |
434 |
> |
if (dp->t != i || dp->p != j) |
435 |
> |
error(CONSISTENCY, |
436 |
> |
"division order in dirgradient"); |
437 |
> |
#endif |
438 |
> |
/* tan(t) */ |
439 |
> |
mag += bright(dp->v)/sqrt(hp->nt/(i+.5) - 1.0); |
440 |
> |
dp += hp->np; |
441 |
> |
} |
442 |
> |
phi = 2.0*PI * (j+.5)/hp->np + PI/2.0; |
443 |
> |
xd += mag * tcos(phi); |
444 |
> |
yd += mag * tsin(phi); |
445 |
> |
} |
446 |
> |
for (i = 0; i < 3; i++) |
447 |
> |
gv[i] = (xd*hp->ux[i] + yd*hp->uy[i])/(hp->nt*hp->np); |
448 |
|
} |