18 |
|
* 12 April 1991 Greg Ward EPFL |
19 |
|
* 19 April 1993 R. Compagnon EPFL (added dgi, brs_gi, ugr) |
20 |
|
*/ |
21 |
< |
|
21 |
> |
|
22 |
|
#include <string.h> |
23 |
|
|
24 |
|
#include "standard.h" |
25 |
|
#include "view.h" |
26 |
< |
|
27 |
< |
|
28 |
< |
double posindex(); |
29 |
< |
|
30 |
< |
double direct(), guth_dgr(), guth_vcp(), cie_cgi(), |
31 |
< |
indirect(), total(), dgi(), brs_gi(), ugr(); |
32 |
< |
|
26 |
> |
|
27 |
> |
|
28 |
> |
struct glare_src { |
29 |
> |
FVECT dir; /* source direction */ |
30 |
> |
double dom; /* solid angle */ |
31 |
> |
double lum; /* average luminance */ |
32 |
> |
struct glare_src *next; |
33 |
> |
} *all_srcs = NULL; |
34 |
> |
|
35 |
> |
struct glare_dir { |
36 |
> |
double ang; /* angle (in radians) */ |
37 |
> |
double indirect; /* indirect illuminance */ |
38 |
> |
struct glare_dir *next; |
39 |
> |
} *all_dirs = NULL; |
40 |
> |
|
41 |
> |
typedef double gdfun(struct glare_dir *gd); |
42 |
> |
|
43 |
> |
static gdfun dgi; |
44 |
> |
static gdfun brs_gi; |
45 |
> |
static gdfun ugr; |
46 |
> |
static gdfun guth_dgr; |
47 |
> |
static gdfun guth_vcp; |
48 |
> |
static gdfun cie_cgi; |
49 |
> |
static gdfun direct; |
50 |
> |
static gdfun indirect; |
51 |
> |
static gdfun total; |
52 |
> |
|
53 |
> |
static gethfunc headline; |
54 |
> |
static void init(void); |
55 |
> |
static void read_input(void); |
56 |
> |
static void print_values(gdfun *func); |
57 |
> |
static double posindex(FVECT sd, FVECT vd, FVECT vu); |
58 |
> |
|
59 |
> |
|
60 |
|
struct named_func { |
61 |
|
char *name; |
62 |
< |
double (*func)(); |
62 |
> |
gdfun *func; |
63 |
|
char *descrip; |
64 |
|
} all_funcs[] = { |
65 |
|
{"dgi", dgi, "Daylight Glare Index"}, |
73 |
|
{"vert_ind", indirect, "Indirect Vertical Illuminance"}, |
74 |
|
{NULL} |
75 |
|
}; |
76 |
< |
|
50 |
< |
struct glare_src { |
51 |
< |
FVECT dir; /* source direction */ |
52 |
< |
double dom; /* solid angle */ |
53 |
< |
double lum; /* average luminance */ |
54 |
< |
struct glare_src *next; |
55 |
< |
} *all_srcs = NULL; |
56 |
< |
|
57 |
< |
struct glare_dir { |
58 |
< |
double ang; /* angle (in radians) */ |
59 |
< |
double indirect; /* indirect illuminance */ |
60 |
< |
struct glare_dir *next; |
61 |
< |
} *all_dirs = NULL; |
62 |
< |
|
76 |
> |
|
77 |
|
#define newp(type) (type *)malloc(sizeof(type)) |
78 |
< |
|
78 |
> |
|
79 |
|
char *progname; |
80 |
|
int print_header = 1; |
81 |
< |
|
81 |
> |
|
82 |
|
VIEW midview = STDVIEW; |
83 |
< |
|
83 |
> |
|
84 |
|
int wrongformat = 0; |
85 |
< |
|
86 |
< |
|
87 |
< |
main(argc, argv) |
88 |
< |
int argc; |
89 |
< |
char *argv[]; |
85 |
> |
|
86 |
> |
|
87 |
> |
int |
88 |
> |
main( |
89 |
> |
int argc, |
90 |
> |
char *argv[] |
91 |
> |
) |
92 |
|
{ |
93 |
|
struct named_func *funp; |
94 |
|
char *progtail; |
139 |
|
fprintf(stderr, "\t%12s\t%s\n", funp->name, funp->descrip); |
140 |
|
exit(1); |
141 |
|
} |
142 |
< |
|
143 |
< |
|
144 |
< |
int |
145 |
< |
headline(s) /* get line from header */ |
146 |
< |
char *s; |
142 |
> |
|
143 |
> |
|
144 |
> |
static int |
145 |
> |
headline( /* get line from header */ |
146 |
> |
char *s, |
147 |
> |
void *p |
148 |
> |
) |
149 |
|
{ |
150 |
< |
char fmt[32]; |
151 |
< |
|
150 |
> |
char fmt[MAXFMTLEN]; |
151 |
> |
|
152 |
|
if (print_header) /* copy to output */ |
153 |
|
fputs(s, stdout); |
154 |
|
if (isview(s)) |
159 |
|
} |
160 |
|
return(0); |
161 |
|
} |
162 |
< |
|
163 |
< |
|
164 |
< |
init() /* initialize calculation */ |
162 |
> |
|
163 |
> |
|
164 |
> |
static void |
165 |
> |
init(void) /* initialize calculation */ |
166 |
|
{ |
167 |
+ |
char *err; |
168 |
|
/* read header */ |
169 |
|
getheader(stdin, headline, NULL); |
170 |
|
if (wrongformat) { |
172 |
|
exit(1); |
173 |
|
} |
174 |
|
/* set view */ |
175 |
< |
if (setview(&midview) != NULL) { |
176 |
< |
fprintf(stderr, "%s: bad view information in input\n", |
175 |
> |
if ((err = setview(&midview)) != NULL) { |
176 |
> |
fprintf(stderr, "%s: %s\n", |
177 |
> |
progname, err); |
178 |
> |
exit(1); |
179 |
> |
} |
180 |
> |
if (fabs(DOT(midview.vdir, midview.vup)) > 1e-4) { |
181 |
> |
fprintf(stderr, |
182 |
> |
"%s: Input view direction not perpendicular to up vector\n", |
183 |
|
progname); |
184 |
|
exit(1); |
185 |
|
} |
186 |
|
} |
187 |
< |
|
188 |
< |
|
189 |
< |
read_input() /* read glare sources from stdin */ |
187 |
> |
|
188 |
> |
|
189 |
> |
static void |
190 |
> |
read_input(void) /* read glare sources from stdin */ |
191 |
|
{ |
192 |
|
#define S_SEARCH 0 |
193 |
|
#define S_SOURCE 1 |
194 |
|
#define S_DIREC 2 |
195 |
|
int state = S_SEARCH; |
196 |
|
char buf[128]; |
197 |
< |
register struct glare_src *gs; |
198 |
< |
register struct glare_dir *gd; |
199 |
< |
|
197 |
> |
struct glare_src *gs; |
198 |
> |
struct glare_dir *gd; |
199 |
> |
|
200 |
|
while (fgets(buf, sizeof(buf), stdin) != NULL) |
201 |
|
switch (state) { |
202 |
|
case S_SEARCH: |
212 |
|
} |
213 |
|
if ((gs = newp(struct glare_src)) == NULL) |
214 |
|
goto memerr; |
215 |
< |
if (sscanf(buf, "%lf %lf %lf %lf %lf", |
216 |
< |
&gs->dir[0], &gs->dir[1], &gs->dir[2], |
217 |
< |
&gs->dom, &gs->lum) != 5) |
215 |
> |
if (sscanf(buf, FVFORMAT, &gs->dir[0], &gs->dir[1], |
216 |
> |
&gs->dir[2]) != 3 || |
217 |
> |
sscanf(sskip2(buf, 3), "%lf %lf", |
218 |
> |
&gs->dom, &gs->lum) != 2) |
219 |
|
goto readerr; |
220 |
|
normalize(gs->dir); |
221 |
|
gs->next = all_srcs; |
247 |
|
#undef S_SOURCE |
248 |
|
#undef S_DIREC |
249 |
|
} |
250 |
< |
|
251 |
< |
|
252 |
< |
print_values(funp) /* print out calculations */ |
253 |
< |
double (*funp)(); |
250 |
> |
|
251 |
> |
|
252 |
> |
static void |
253 |
> |
print_values( /* print out calculations */ |
254 |
> |
gdfun *func |
255 |
> |
) |
256 |
|
{ |
257 |
< |
register struct glare_dir *gd; |
258 |
< |
|
257 |
> |
struct glare_dir *gd; |
258 |
> |
|
259 |
|
for (gd = all_dirs; gd != NULL; gd = gd->next) |
260 |
< |
printf("%f\t%f\n", gd->ang*(180.0/PI), (*funp)(gd)); |
260 |
> |
printf("%f\t%f\n", gd->ang*(180.0/PI), (*func)(gd)); |
261 |
|
} |
262 |
< |
|
263 |
< |
|
264 |
< |
double |
265 |
< |
direct(gd) /* compute direct vertical illuminance */ |
266 |
< |
struct glare_dir *gd; |
262 |
> |
|
263 |
> |
|
264 |
> |
static double |
265 |
> |
direct( /* compute direct vertical illuminance */ |
266 |
> |
struct glare_dir *gd |
267 |
> |
) |
268 |
|
{ |
269 |
|
FVECT mydir; |
270 |
|
double d, dval; |
271 |
< |
register struct glare_src *gs; |
272 |
< |
|
271 |
> |
struct glare_src *gs; |
272 |
> |
|
273 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
274 |
|
dval = 0.0; |
275 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
279 |
|
} |
280 |
|
return(dval); |
281 |
|
} |
282 |
< |
|
283 |
< |
|
284 |
< |
double |
285 |
< |
indirect(gd) /* return indirect vertical illuminance */ |
286 |
< |
struct glare_dir *gd; |
282 |
> |
|
283 |
> |
|
284 |
> |
static double |
285 |
> |
indirect( /* return indirect vertical illuminance */ |
286 |
> |
struct glare_dir *gd |
287 |
> |
) |
288 |
|
{ |
289 |
|
return(gd->indirect); |
290 |
|
} |
291 |
< |
|
292 |
< |
|
293 |
< |
double |
294 |
< |
total(gd) /* return total vertical illuminance */ |
295 |
< |
struct glare_dir *gd; |
291 |
> |
|
292 |
> |
|
293 |
> |
static double |
294 |
> |
total( /* return total vertical illuminance */ |
295 |
> |
struct glare_dir *gd |
296 |
> |
) |
297 |
|
{ |
298 |
|
return(direct(gd)+gd->indirect); |
299 |
|
} |
300 |
< |
|
301 |
< |
|
300 |
> |
|
301 |
> |
|
302 |
|
/* |
303 |
|
* posindex - compute glare position index from: |
304 |
|
* |
312 |
|
* This calculation presumes the view direction and up vectors perpendicular. |
313 |
|
* We return a value less than zero for improper positions. |
314 |
|
*/ |
315 |
< |
|
316 |
< |
double |
317 |
< |
posindex(sd, vd, vu) /* compute position index */ |
318 |
< |
FVECT sd, vd, vu; |
315 |
> |
|
316 |
> |
static double |
317 |
> |
posindex( /* compute position index */ |
318 |
> |
FVECT sd, |
319 |
> |
FVECT vd, |
320 |
> |
FVECT vu |
321 |
> |
) |
322 |
|
{ |
323 |
|
double sigma, tau; |
324 |
|
double d; |
325 |
< |
|
325 |
> |
|
326 |
|
d = DOT(sd,vd); |
327 |
|
if (d <= 0.0) |
328 |
|
return(-1.0); |
329 |
< |
if (d >= 1.0) |
329 |
> |
if (d >= 1.0-FTINY) |
330 |
|
return(1.0); |
331 |
|
sigma = acos(d) * (180./PI); |
332 |
|
d = fabs(DOT(sd,vu)/sqrt(1.0-d*d)); |
333 |
< |
if (d >= 1.0) |
298 |
< |
tau = 0.0; |
299 |
< |
else |
300 |
< |
tau = acos(d) * (180./PI); |
333 |
> |
tau = Acos(d) * (180./PI); |
334 |
|
return( exp( sigma*( (35.2 - tau*.31889 - 1.22*exp(-.22222*tau))*1e-3 |
335 |
|
+ sigma*(21. + tau*(.26667 + tau*-.002963))*1e-5 ) |
336 |
|
) ); |
337 |
|
} |
338 |
< |
|
339 |
< |
|
340 |
< |
double |
341 |
< |
dgi(gd) /* compute Daylight Glare Index */ |
342 |
< |
struct glare_dir *gd; |
338 |
> |
|
339 |
> |
|
340 |
> |
static double |
341 |
> |
dgi( /* compute Daylight Glare Index */ |
342 |
> |
struct glare_dir *gd |
343 |
> |
) |
344 |
|
{ |
345 |
< |
register struct glare_src *gs; |
345 |
> |
struct glare_src *gs; |
346 |
|
FVECT mydir,testdir[7],vhor; |
347 |
|
double r,posn,omega,p[7],sum; |
348 |
< |
int i,n; |
349 |
< |
|
348 |
> |
int i; |
349 |
> |
|
350 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
351 |
< |
sum = 0.0; n = 0; |
351 |
> |
sum = 0.0; |
352 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
353 |
|
|
354 |
|
/* compute 1/p^2 weighted solid angle of the source */ |
355 |
< |
r = sqrt(1 - pow(1.-gs->dom/2./PI,2.)); |
355 |
> |
r = 1. - gs->dom*(.5/PI); |
356 |
> |
r = sqrt(1. - r*r); |
357 |
|
fcross(vhor,gs->dir,midview.vup); |
358 |
< |
normalize(vhor); |
358 |
> |
if (normalize(vhor) == 0.) |
359 |
> |
continue; |
360 |
|
VCOPY(testdir[0],gs->dir); |
361 |
|
fvsum(testdir[1],gs->dir,vhor,r); |
362 |
|
fvsum(testdir[2],gs->dir,vhor,0.5*r); |
367 |
|
fvsum(testdir[6],testdir[4],midview.vup,0.866*r); |
368 |
|
fvsum(testdir[4],testdir[4],midview.vup,-0.866*r); |
369 |
|
for (i = 0; i < 7; i++) { |
370 |
< |
normalize(testdir[i]); |
370 |
> |
p[i] = 0.0; |
371 |
> |
if (normalize(testdir[i]) == 0.) |
372 |
> |
continue; |
373 |
|
posn = posindex(testdir[i],mydir,midview.vup); |
374 |
< |
if (posn <= FTINY) |
337 |
< |
p[i] = 0.0; |
338 |
< |
else |
374 |
> |
if (posn > FTINY) |
375 |
|
p[i] = 1./(posn*posn); |
376 |
|
} |
377 |
< |
r = 1-gs->dom/2./PI; |
377 |
> |
r = 1. - gs->dom*(.5/PI); |
378 |
|
omega = gs->dom*p[0]; |
379 |
< |
omega += (r*PI*(1+1/r/r)-2*PI)*(-p[0]+(p[1]+p[2])*0.5); |
380 |
< |
omega += (2*PI-r*PI*(1+1/r/r))*(-p[0]-0.1667*(p[1]+p[3]) |
379 |
> |
omega += (r*PI*(1.+1./(r*r))-2.*PI)*(-p[0]+(p[1]+p[2])*0.5); |
380 |
> |
omega += (2.*PI-r*PI*(1.+1./(r*r)))*(-p[0]-0.1667*(p[1]+p[3]) |
381 |
|
+0.3334*(p[2]+p[4]+p[5]+p[6])); |
382 |
< |
|
383 |
< |
sum += pow(gs->lum,1.6) * pow(omega,0.8) / |
384 |
< |
(gd->indirect/PI + 0.07*sqrt(gs->dom)*gs->lum); |
385 |
< |
n++; |
382 |
> |
if (omega <= 0.) |
383 |
> |
continue; |
384 |
> |
sum += pow(gs->lum,1.6) * pow(omega,0.8) / |
385 |
> |
(gd->indirect*(1./PI) + 0.07*sqrt(gs->dom)*gs->lum); |
386 |
|
} |
387 |
< |
if (n == 0) |
387 |
> |
if (sum <= FTINY) |
388 |
|
return(0.0); |
389 |
< |
return( 10*log10(0.478*sum) ); |
389 |
> |
return( 10.*log10(0.478*sum) ); |
390 |
|
} |
355 |
– |
|
391 |
|
|
392 |
< |
double |
393 |
< |
brs_gi(gd) /* compute BRS Glare Index */ |
394 |
< |
struct glare_dir *gd; |
392 |
> |
|
393 |
> |
static double |
394 |
> |
brs_gi( /* compute BRS Glare Index */ |
395 |
> |
struct glare_dir *gd |
396 |
> |
) |
397 |
|
{ |
398 |
< |
register struct glare_src *gs; |
398 |
> |
struct glare_src *gs; |
399 |
|
FVECT mydir; |
400 |
|
double p; |
401 |
|
double sum; |
402 |
< |
|
402 |
> |
|
403 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
404 |
|
sum = 0.0; |
405 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
410 |
|
} |
411 |
|
if (sum <= FTINY) |
412 |
|
return(0.0); |
413 |
< |
sum /= gd->indirect/PI; |
413 |
> |
sum *= PI/gd->indirect; |
414 |
|
return(10*log10(0.478*sum)); |
415 |
|
} |
416 |
|
|
417 |
|
|
418 |
< |
double |
419 |
< |
guth_dgr(gd) /* compute Guth discomfort glare rating */ |
420 |
< |
struct glare_dir *gd; |
418 |
> |
static double |
419 |
> |
guth_dgr( /* compute Guth discomfort glare rating */ |
420 |
> |
struct glare_dir *gd |
421 |
> |
) |
422 |
|
{ |
423 |
|
#define q(w) (20.4*w+1.52*pow(w,.2)-.075) |
424 |
< |
register struct glare_src *gs; |
424 |
> |
struct glare_src *gs; |
425 |
|
FVECT mydir; |
426 |
|
double p; |
427 |
|
double sum; |
428 |
|
double wtot, brsum; |
429 |
|
int n; |
430 |
< |
|
430 |
> |
|
431 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
432 |
|
sum = wtot = brsum = 0.0; n = 0; |
433 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
445 |
|
pow((double)n, -.0914) ) ); |
446 |
|
#undef q |
447 |
|
} |
448 |
< |
|
449 |
< |
|
448 |
> |
|
449 |
> |
|
450 |
|
#ifndef M_SQRT2 |
451 |
|
#define M_SQRT2 1.41421356237309504880 |
452 |
|
#endif |
453 |
< |
|
453 |
> |
|
454 |
|
#define norm_integral(z) (1.-.5*erfc((z)/M_SQRT2)) |
455 |
< |
|
456 |
< |
|
457 |
< |
double |
458 |
< |
guth_vcp(gd) /* compute Guth visual comfort probability */ |
459 |
< |
struct glare_dir *gd; |
455 |
> |
|
456 |
> |
|
457 |
> |
static double |
458 |
> |
guth_vcp( /* compute Guth visual comfort probability */ |
459 |
> |
struct glare_dir *gd |
460 |
> |
) |
461 |
|
{ |
462 |
|
extern double erfc(); |
463 |
|
double dgr; |
464 |
< |
|
464 |
> |
|
465 |
|
dgr = guth_dgr(gd); |
466 |
|
if (dgr <= FTINY) |
467 |
|
return(100.0); |
468 |
|
return(100.*norm_integral(6.374-1.3227*log(dgr))); |
469 |
|
} |
470 |
< |
|
471 |
< |
|
472 |
< |
double |
473 |
< |
cie_cgi(gd) /* compute CIE Glare Index */ |
474 |
< |
struct glare_dir *gd; |
470 |
> |
|
471 |
> |
|
472 |
> |
static double |
473 |
> |
cie_cgi( /* compute CIE Glare Index */ |
474 |
> |
struct glare_dir *gd |
475 |
> |
) |
476 |
|
{ |
477 |
< |
register struct glare_src *gs; |
477 |
> |
struct glare_src *gs; |
478 |
|
FVECT mydir; |
479 |
|
double dillum; |
480 |
|
double p; |
481 |
|
double sum; |
482 |
< |
|
482 |
> |
|
483 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
484 |
|
sum = 0.0; |
485 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
495 |
|
} |
496 |
|
|
497 |
|
|
498 |
< |
double |
499 |
< |
ugr(gd) /* compute Unified Glare Rating */ |
500 |
< |
struct glare_dir *gd; |
498 |
> |
static double |
499 |
> |
ugr( /* compute Unified Glare Rating */ |
500 |
> |
struct glare_dir *gd |
501 |
> |
) |
502 |
|
{ |
503 |
< |
register struct glare_src *gs; |
503 |
> |
struct glare_src *gs; |
504 |
|
FVECT mydir; |
505 |
|
double p; |
506 |
|
double sum; |
507 |
< |
|
507 |
> |
|
508 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
509 |
|
sum = 0.0; |
510 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |