9 |
|
* |
10 |
|
* guth_dgr - Guth discomfort glare rating |
11 |
|
* guth_vcp - Guth visual comfort probability |
12 |
+ |
* cie_cgi - CIE Glare Index (1983) |
13 |
|
* |
14 |
|
* 12 April 1991 Greg Ward EPFL |
15 |
|
*/ |
22 |
|
double posindex(); |
23 |
|
int headline(); |
24 |
|
|
25 |
< |
double direct(), guth_dgr(), guth_vcp(); |
25 |
> |
double direct(), guth_dgr(), guth_vcp(), cie_cgi(); |
26 |
|
|
27 |
|
struct named_func { |
28 |
|
char *name; |
31 |
|
{"direct", direct}, |
32 |
|
{"guth_dgr", guth_dgr}, |
33 |
|
{"guth_vcp", guth_vcp}, |
34 |
+ |
{"cie_cgi", cie_cgi}, |
35 |
|
{NULL} |
36 |
|
}; |
37 |
|
|
294 |
|
} |
295 |
|
if (n == 0) |
296 |
|
return(0.0); |
297 |
< |
else |
298 |
< |
return( pow( |
297 |
< |
.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
297 |
> |
|
298 |
> |
return( pow(.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
299 |
|
pow((double)n, -.0914) ) ); |
300 |
|
#undef q |
301 |
|
} |
320 |
|
if (dgr <= FTINY) |
321 |
|
return(100.0); |
322 |
|
return(100.*norm_integral(6.374-1.3227*log(dgr))); |
323 |
+ |
} |
324 |
+ |
|
325 |
+ |
|
326 |
+ |
double |
327 |
+ |
cie_cgi(gd) /* compute CIE Glare Index */ |
328 |
+ |
struct glare_dir *gd; |
329 |
+ |
{ |
330 |
+ |
register struct glare_src *gs; |
331 |
+ |
FVECT mydir; |
332 |
+ |
double dillum; |
333 |
+ |
double p; |
334 |
+ |
double sum; |
335 |
+ |
|
336 |
+ |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
337 |
+ |
sum = 0.0; |
338 |
+ |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
339 |
+ |
p = posindex(gs->dir, mydir, midview.vup); |
340 |
+ |
if (p <= FTINY) |
341 |
+ |
continue; |
342 |
+ |
sum += gs->lum*gs->lum * gs->dom / (p*p); |
343 |
+ |
} |
344 |
+ |
if (sum <= FTINY) |
345 |
+ |
return(0.0); |
346 |
+ |
dillum = direct(gd); |
347 |
+ |
return(8.*log10(2.*sum*(1.+dillum/500.)/(dillum+gd->indirect))); |
348 |
|
} |