5 |
|
#endif |
6 |
|
|
7 |
|
/* |
8 |
< |
* Compute Glare Index given by program name: |
8 |
> |
* Compute Glare Index given by program name or -t option: |
9 |
|
* |
10 |
+ |
* dgi - Daylight Glare Index |
11 |
+ |
* brs_gi - Building Research Station Glare Index (Petherbridge |
12 |
+ |
* & Hopkinson) |
13 |
+ |
* ugr - Unified Glare Rating System (Fischer) |
14 |
|
* guth_dgr - Guth discomfort glare rating |
15 |
|
* guth_vcp - Guth visual comfort probability |
16 |
+ |
* cie_cgi - CIE Glare Index (1983, due to Einhorn) |
17 |
+ |
* vert_dir - Direct vertical illuminance |
18 |
+ |
* vert_ind - Indirect vertical illuminance (from input) |
19 |
+ |
* vert_ill - Total vertical illuminance |
20 |
|
* |
21 |
|
* 12 April 1991 Greg Ward EPFL |
22 |
+ |
* 19 April 1993 R. Compagnon EPFL (added dgi, brs_gi, ugr) |
23 |
|
*/ |
24 |
< |
|
24 |
> |
|
25 |
|
#include "standard.h" |
26 |
|
#include "view.h" |
27 |
< |
|
27 |
> |
|
28 |
|
extern double erfc(); |
29 |
< |
|
29 |
> |
|
30 |
|
double posindex(); |
31 |
< |
int headline(); |
32 |
< |
|
33 |
< |
double direct(), guth_dgr(), guth_vcp(); |
34 |
< |
|
31 |
> |
|
32 |
> |
double direct(), guth_dgr(), guth_vcp(), cie_cgi(), |
33 |
> |
indirect(), total(), dgi(), brs_gi(), ugr(); |
34 |
> |
|
35 |
|
struct named_func { |
36 |
|
char *name; |
37 |
|
double (*func)(); |
38 |
+ |
char *descrip; |
39 |
|
} all_funcs[] = { |
40 |
< |
{"direct", direct}, |
41 |
< |
{"guth_dgr", guth_dgr}, |
42 |
< |
{"guth_vcp", guth_vcp}, |
40 |
> |
{"dgi", dgi, "Daylight Glare Index"}, |
41 |
> |
{"brs_gi", brs_gi, "BRS Glare Index"}, |
42 |
> |
{"ugr", ugr, "Unified Glare Rating"}, |
43 |
> |
{"guth_vcp", guth_vcp, "Guth Visual Comfort Probability"}, |
44 |
> |
{"cie_cgi", cie_cgi, "CIE Glare Index (Einhorn)"}, |
45 |
> |
{"guth_dgr", guth_dgr, "Guth Disability Glare Rating"}, |
46 |
> |
{"vert_dir", direct, "Direct Vertical Illuminance"}, |
47 |
> |
{"vert_ill", total, "Total Vertical Illuminance"}, |
48 |
> |
{"vert_ind", indirect, "Indirect Vertical Illuminance"}, |
49 |
|
{NULL} |
50 |
|
}; |
51 |
< |
|
51 |
> |
|
52 |
|
struct glare_src { |
53 |
|
FVECT dir; /* source direction */ |
54 |
|
double dom; /* solid angle */ |
55 |
|
double lum; /* average luminance */ |
56 |
|
struct glare_src *next; |
57 |
|
} *all_srcs = NULL; |
58 |
< |
|
58 |
> |
|
59 |
|
struct glare_dir { |
60 |
|
double ang; /* angle (in radians) */ |
61 |
|
double indirect; /* indirect illuminance */ |
62 |
|
struct glare_dir *next; |
63 |
|
} *all_dirs = NULL; |
64 |
< |
|
64 |
> |
|
65 |
|
#define newp(type) (type *)malloc(sizeof(type)) |
66 |
< |
|
66 |
> |
|
67 |
|
char *progname; |
68 |
|
int print_header = 1; |
69 |
< |
|
69 |
> |
|
70 |
|
VIEW midview = STDVIEW; |
71 |
< |
|
71 |
> |
|
72 |
|
int wrongformat = 0; |
73 |
< |
|
74 |
< |
|
73 |
> |
|
74 |
> |
|
75 |
|
main(argc, argv) |
76 |
|
int argc; |
77 |
|
char *argv[]; |
106 |
|
perror(argv[i]); |
107 |
|
exit(1); |
108 |
|
} |
109 |
< |
/* read header */ |
94 |
< |
getheader(stdin, headline, NULL); |
95 |
< |
if (wrongformat) { |
96 |
< |
fprintf(stderr, "%s: bad input format\n", progname); |
97 |
< |
exit(1); |
98 |
< |
} |
99 |
< |
if (print_header) { /* add to header */ |
100 |
< |
printargs(i, argv, stdout); |
101 |
< |
putchar('\n'); |
102 |
< |
} |
103 |
< |
/* set view */ |
104 |
< |
if (setview(&midview) != NULL) { |
105 |
< |
fprintf(stderr, "%s: bad view information in input\n", |
106 |
< |
progname); |
107 |
< |
exit(1); |
108 |
< |
} |
109 |
< |
/* get findglare data */ |
110 |
< |
read_input(); |
111 |
< |
/* find calculation */ |
109 |
> |
/* find and run calculation */ |
110 |
|
for (funp = all_funcs; funp->name != NULL; funp++) |
111 |
|
if (!strcmp(funp->name, progtail)) { |
112 |
+ |
init(); |
113 |
+ |
read_input(); |
114 |
+ |
if (print_header) { |
115 |
+ |
printargs(i, argv, stdout); |
116 |
+ |
putchar('\n'); |
117 |
+ |
} |
118 |
|
print_values(funp->func); |
119 |
|
exit(0); /* we're done */ |
120 |
|
} |
121 |
|
/* invalid function */ |
118 |
– |
fprintf(stderr, "%s: unknown function!\n", progtail); |
119 |
– |
exit(1); |
122 |
|
userr: |
123 |
< |
fprintf(stderr, "Usage: %s [-t type][-h] [input]\n", progname); |
123 |
> |
fprintf(stderr, "Usage: %s -t type [-h] [input]\n", progname); |
124 |
> |
fprintf(stderr, "\twhere 'type' is one of the following:\n"); |
125 |
> |
for (funp = all_funcs; funp->name != NULL; funp++) |
126 |
> |
fprintf(stderr, "\t%12s\t%s\n", funp->name, funp->descrip); |
127 |
|
exit(1); |
128 |
|
} |
129 |
< |
|
130 |
< |
|
129 |
> |
|
130 |
> |
|
131 |
|
headline(s) /* get line from header */ |
132 |
|
char *s; |
133 |
|
{ |
134 |
|
char fmt[32]; |
135 |
< |
|
135 |
> |
|
136 |
|
if (print_header) /* copy to output */ |
137 |
|
fputs(s, stdout); |
138 |
< |
if (!strncmp(s, VIEWSTR, VIEWSTRL)) |
139 |
< |
sscanview(&midview, s+VIEWSTRL); |
138 |
> |
if (isview(s)) |
139 |
> |
sscanview(&midview, s); |
140 |
|
else if (isformat(s)) { |
141 |
|
formatval(fmt, s); |
142 |
< |
wrongformat = strcmp(fmt, "ASCII"); |
142 |
> |
wrongformat = strcmp(fmt, "ascii"); |
143 |
|
} |
144 |
|
} |
145 |
< |
|
146 |
< |
|
145 |
> |
|
146 |
> |
|
147 |
> |
init() /* initialize calculation */ |
148 |
> |
{ |
149 |
> |
/* read header */ |
150 |
> |
getheader(stdin, headline, NULL); |
151 |
> |
if (wrongformat) { |
152 |
> |
fprintf(stderr, "%s: bad input format\n", progname); |
153 |
> |
exit(1); |
154 |
> |
} |
155 |
> |
/* set view */ |
156 |
> |
if (setview(&midview) != NULL) { |
157 |
> |
fprintf(stderr, "%s: bad view information in input\n", |
158 |
> |
progname); |
159 |
> |
exit(1); |
160 |
> |
} |
161 |
> |
} |
162 |
> |
|
163 |
> |
|
164 |
|
read_input() /* read glare sources from stdin */ |
165 |
|
{ |
166 |
|
#define S_SEARCH 0 |
170 |
|
char buf[128]; |
171 |
|
register struct glare_src *gs; |
172 |
|
register struct glare_dir *gd; |
173 |
< |
|
173 |
> |
|
174 |
|
while (fgets(buf, sizeof(buf), stdin) != NULL) |
175 |
|
switch (state) { |
176 |
|
case S_SEARCH: |
220 |
|
#undef S_SOURCE |
221 |
|
#undef S_DIREC |
222 |
|
} |
223 |
< |
|
224 |
< |
|
223 |
> |
|
224 |
> |
|
225 |
|
print_values(funp) /* print out calculations */ |
226 |
|
double (*funp)(); |
227 |
|
{ |
228 |
|
register struct glare_dir *gd; |
229 |
< |
|
229 |
> |
|
230 |
|
for (gd = all_dirs; gd != NULL; gd = gd->next) |
231 |
|
printf("%f\t%f\n", gd->ang*(180.0/PI), (*funp)(gd)); |
232 |
|
} |
233 |
< |
|
234 |
< |
|
233 |
> |
|
234 |
> |
|
235 |
|
double |
236 |
< |
direct(gd) /* compute direct illuminance */ |
236 |
> |
direct(gd) /* compute direct vertical illuminance */ |
237 |
|
struct glare_dir *gd; |
238 |
|
{ |
239 |
|
FVECT mydir; |
240 |
|
double d, dval; |
241 |
|
register struct glare_src *gs; |
242 |
< |
|
242 |
> |
|
243 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
244 |
|
dval = 0.0; |
245 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
249 |
|
} |
250 |
|
return(dval); |
251 |
|
} |
252 |
< |
|
253 |
< |
|
252 |
> |
|
253 |
> |
|
254 |
> |
double |
255 |
> |
indirect(gd) /* return indirect vertical illuminance */ |
256 |
> |
struct glare_dir *gd; |
257 |
> |
{ |
258 |
> |
return(gd->indirect); |
259 |
> |
} |
260 |
> |
|
261 |
> |
|
262 |
> |
double |
263 |
> |
total(gd) /* return total vertical illuminance */ |
264 |
> |
struct glare_dir *gd; |
265 |
> |
{ |
266 |
> |
return(direct(gd)+gd->indirect); |
267 |
> |
} |
268 |
> |
|
269 |
> |
|
270 |
|
/* |
271 |
|
* posindex - compute glare position index from: |
272 |
|
* |
280 |
|
* This calculation presumes the view direction and up vectors perpendicular. |
281 |
|
* We return a value less than zero for improper positions. |
282 |
|
*/ |
283 |
< |
|
283 |
> |
|
284 |
|
double |
285 |
|
posindex(sd, vd, vu) /* compute position index */ |
286 |
|
FVECT sd, vd, vu; |
287 |
|
{ |
288 |
|
double sigma, tau; |
289 |
|
double d; |
290 |
< |
|
290 |
> |
|
291 |
|
d = DOT(sd,vd); |
292 |
|
if (d <= 0.0) |
293 |
|
return(-1.0); |
294 |
|
if (d >= 1.0) |
295 |
|
return(1.0); |
296 |
|
sigma = acos(d) * (180./PI); |
297 |
< |
d = DOT(sd,vu)/sqrt(1.0-d*d); |
297 |
> |
d = fabs(DOT(sd,vu)/sqrt(1.0-d*d)); |
298 |
|
if (d >= 1.0) |
299 |
|
tau = 0.0; |
300 |
|
else |
303 |
|
+ sigma*(21. + tau*(.26667 + tau*-.002963))*1e-5 ) |
304 |
|
) ); |
305 |
|
} |
306 |
+ |
|
307 |
+ |
|
308 |
+ |
double |
309 |
+ |
dgi(gd) /* compute Daylight Glare Index */ |
310 |
+ |
struct glare_dir *gd; |
311 |
+ |
{ |
312 |
+ |
register struct glare_src *gs; |
313 |
+ |
FVECT mydir,testdir[7],vhor; |
314 |
+ |
double r,omega,p[7],sum; |
315 |
+ |
int i,n; |
316 |
+ |
|
317 |
+ |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
318 |
+ |
sum = 0.0; n = 0; |
319 |
+ |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
320 |
|
|
321 |
+ |
/* compute 1/p^2 weighted solid angle of the source */ |
322 |
+ |
r = sqrt(1 - pow(1.-gs->dom/2./PI,2.)); |
323 |
+ |
fcross(vhor,gs->dir,midview.vup); |
324 |
+ |
normalize(vhor); |
325 |
+ |
VCOPY(testdir[0],gs->dir); |
326 |
+ |
fvsum(testdir[1],gs->dir,vhor,r); |
327 |
+ |
fvsum(testdir[2],gs->dir,vhor,0.5*r); |
328 |
+ |
fvsum(testdir[5],testdir[2],midview.vup,-0.866*r); |
329 |
+ |
fvsum(testdir[2],testdir[2],midview.vup,0.866*r); |
330 |
+ |
fvsum(testdir[3],gs->dir,vhor,-r); |
331 |
+ |
fvsum(testdir[4],gs->dir,vhor,-0.5*r); |
332 |
+ |
fvsum(testdir[6],testdir[4],midview.vup,0.866*r); |
333 |
+ |
fvsum(testdir[4],testdir[4],midview.vup,-0.866*r); |
334 |
+ |
for (i = 0; i < 7; i++) { |
335 |
+ |
normalize(testdir[i]); |
336 |
+ |
p[i] = pow(posindex(testdir[i],mydir,midview.vup),-2.0); |
337 |
+ |
if (p[i] <= FTINY) p[i] = 0.0; |
338 |
+ |
} |
339 |
+ |
r = 1-gs->dom/2./PI; |
340 |
+ |
omega = gs->dom*p[0]; |
341 |
+ |
omega += (r*PI*(1+1/r/r)-2*PI)*(-p[0]+(p[1]+p[2])*0.5); |
342 |
+ |
omega += (2*PI-r*PI*(1+1/r/r))*(-p[0]-0.1667*(p[1]+p[3]) |
343 |
+ |
+0.3334*(p[2]+p[4]+p[5]+p[6])); |
344 |
|
|
345 |
+ |
sum += pow(gs->lum,1.6) * pow(omega,0.8) / |
346 |
+ |
(gd->indirect/PI + 0.07*sqrt(gs->dom)*gs->lum); |
347 |
+ |
n++; |
348 |
+ |
} |
349 |
+ |
if (n == 0) |
350 |
+ |
return(0.0); |
351 |
+ |
return( 10*log10(0.478*sum) ); |
352 |
+ |
} |
353 |
+ |
|
354 |
+ |
|
355 |
|
double |
356 |
+ |
brs_gi(gd) /* compute BRS Glare Index */ |
357 |
+ |
struct glare_dir *gd; |
358 |
+ |
{ |
359 |
+ |
register struct glare_src *gs; |
360 |
+ |
FVECT mydir; |
361 |
+ |
double p; |
362 |
+ |
double sum; |
363 |
+ |
|
364 |
+ |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
365 |
+ |
sum = 0.0; |
366 |
+ |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
367 |
+ |
p = posindex(gs->dir, mydir, midview.vup); |
368 |
+ |
if (p <= FTINY) |
369 |
+ |
continue; |
370 |
+ |
sum += pow(gs->lum/p,1.6) * pow(gs->dom,0.8); |
371 |
+ |
} |
372 |
+ |
if (sum <= FTINY) |
373 |
+ |
return(0.0); |
374 |
+ |
sum /= gd->indirect/PI; |
375 |
+ |
return(10*log10(0.478*sum)); |
376 |
+ |
} |
377 |
+ |
|
378 |
+ |
|
379 |
+ |
double |
380 |
|
guth_dgr(gd) /* compute Guth discomfort glare rating */ |
381 |
|
struct glare_dir *gd; |
382 |
|
{ |
383 |
|
#define q(w) (20.4*w+1.52*pow(w,.2)-.075) |
384 |
|
register struct glare_src *gs; |
385 |
+ |
FVECT mydir; |
386 |
|
double p; |
387 |
|
double sum; |
388 |
|
double wtot, brsum; |
389 |
|
int n; |
390 |
< |
|
390 |
> |
|
391 |
> |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
392 |
|
sum = wtot = brsum = 0.0; n = 0; |
393 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
394 |
< |
p = posindex(gs->dir, midview.vdir, midview.vup); |
394 |
> |
p = posindex(gs->dir, mydir, midview.vup); |
395 |
|
if (p <= FTINY) |
396 |
|
continue; |
397 |
|
sum += gs->lum * q(gs->dom) / p; |
401 |
|
} |
402 |
|
if (n == 0) |
403 |
|
return(0.0); |
404 |
< |
else |
294 |
< |
return( pow( |
295 |
< |
.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
404 |
> |
return( pow(.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
405 |
|
pow((double)n, -.0914) ) ); |
406 |
|
#undef q |
407 |
|
} |
408 |
< |
|
409 |
< |
|
408 |
> |
|
409 |
> |
|
410 |
|
extern double erf(), erfc(); |
411 |
< |
|
411 |
> |
|
412 |
|
#ifndef M_SQRT2 |
413 |
|
#define M_SQRT2 1.41421356237309504880 |
414 |
|
#endif |
415 |
< |
|
415 |
> |
|
416 |
|
#define norm_integral(z) (1.-.5*erfc((z)/M_SQRT2)) |
417 |
+ |
|
418 |
+ |
|
419 |
+ |
double |
420 |
+ |
guth_vcp(gd) /* compute Guth visual comfort probability */ |
421 |
+ |
struct glare_dir *gd; |
422 |
+ |
{ |
423 |
+ |
double dgr; |
424 |
+ |
|
425 |
+ |
dgr = guth_dgr(gd); |
426 |
+ |
if (dgr <= FTINY) |
427 |
+ |
return(100.0); |
428 |
+ |
return(100.*norm_integral(6.374-1.3227*log(dgr))); |
429 |
+ |
} |
430 |
+ |
|
431 |
+ |
|
432 |
+ |
double |
433 |
+ |
cie_cgi(gd) /* compute CIE Glare Index */ |
434 |
+ |
struct glare_dir *gd; |
435 |
+ |
{ |
436 |
+ |
register struct glare_src *gs; |
437 |
+ |
FVECT mydir; |
438 |
+ |
double dillum; |
439 |
+ |
double p; |
440 |
+ |
double sum; |
441 |
+ |
|
442 |
+ |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
443 |
+ |
sum = 0.0; |
444 |
+ |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
445 |
+ |
p = posindex(gs->dir, mydir, midview.vup); |
446 |
+ |
if (p <= FTINY) |
447 |
+ |
continue; |
448 |
+ |
sum += gs->lum*gs->lum * gs->dom / (p*p); |
449 |
+ |
} |
450 |
+ |
if (sum <= FTINY) |
451 |
+ |
return(0.0); |
452 |
+ |
dillum = direct(gd); |
453 |
+ |
return(8.*log10(2.*sum*(1.+dillum/500.)/(dillum+gd->indirect))); |
454 |
+ |
} |
455 |
|
|
456 |
|
|
457 |
|
double |
458 |
< |
guth_vcp(gd) /* compute Guth visual comfort probability */ |
458 |
> |
ugr(gd) /* compute Unified Glare Rating */ |
459 |
|
struct glare_dir *gd; |
460 |
|
{ |
461 |
< |
return(100.*norm_integral(6.374-1.3227*log(guth_dgr(gd)))); |
461 |
> |
register struct glare_src *gs; |
462 |
> |
FVECT mydir; |
463 |
> |
double p; |
464 |
> |
double sum; |
465 |
> |
|
466 |
> |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
467 |
> |
sum = 0.0; |
468 |
> |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
469 |
> |
p = posindex(gs->dir, mydir, midview.vup); |
470 |
> |
if (p <= FTINY) |
471 |
> |
continue; |
472 |
> |
sum += gs->lum*gs->lum * gs->dom / (p*p); |
473 |
> |
} |
474 |
> |
if (sum <= FTINY) |
475 |
> |
return(0.0); |
476 |
> |
return(8.*log10(0.25*sum*PI/gd->indirect)); |
477 |
|
} |