7 |
|
/* |
8 |
|
* Compute Glare Index given by program name: |
9 |
|
* |
10 |
< |
* gnuth_dgr - Gnuth discomfort glare rating |
11 |
< |
* gnuth_vcp - Gnuth visual comfort probability |
10 |
> |
* guth_dgr - Guth discomfort glare rating |
11 |
> |
* guth_vcp - Guth visual comfort probability |
12 |
|
* |
13 |
|
* 12 April 1991 Greg Ward EPFL |
14 |
|
*/ |
21 |
|
double posindex(); |
22 |
|
int headline(); |
23 |
|
|
24 |
< |
double direct(), gnuth_dgr(), gnuth_vcp(); |
24 |
> |
double direct(), guth_dgr(), guth_vcp(); |
25 |
|
|
26 |
|
struct named_func { |
27 |
|
char *name; |
28 |
|
double (*func)(); |
29 |
|
} all_funcs[] = { |
30 |
|
{"direct", direct}, |
31 |
< |
{"gnuth_dgr", gnuth_dgr}, |
32 |
< |
{"gnuth_vcp", gnuth_vcp}, |
31 |
> |
{"guth_dgr", guth_dgr}, |
32 |
> |
{"guth_vcp", guth_vcp}, |
33 |
|
{NULL} |
34 |
|
}; |
35 |
|
|
53 |
|
|
54 |
|
VIEW midview = STDVIEW; |
55 |
|
|
56 |
+ |
int wrongformat = 0; |
57 |
|
|
58 |
+ |
|
59 |
|
main(argc, argv) |
60 |
|
int argc; |
61 |
|
char *argv[]; |
91 |
|
exit(1); |
92 |
|
} |
93 |
|
/* read header */ |
94 |
< |
getheader(stdin, headline); |
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"); |
105 |
> |
fprintf(stderr, "%s: bad view information in input\n", |
106 |
> |
progname); |
107 |
|
exit(1); |
108 |
|
} |
109 |
|
/* get findglare data */ |
126 |
|
headline(s) /* get line from header */ |
127 |
|
char *s; |
128 |
|
{ |
129 |
+ |
char fmt[32]; |
130 |
+ |
|
131 |
|
if (print_header) /* copy to output */ |
132 |
|
fputs(s, stdout); |
133 |
|
if (!strncmp(s, VIEWSTR, VIEWSTRL)) |
134 |
|
sscanview(&midview, s+VIEWSTRL); |
135 |
+ |
else if (isformat(s)) { |
136 |
+ |
formatval(fmt, s); |
137 |
+ |
wrongformat = strcmp(fmt, "ASCII"); |
138 |
+ |
} |
139 |
|
} |
140 |
|
|
141 |
|
|
168 |
|
&gs->dir[0], &gs->dir[1], &gs->dir[2], |
169 |
|
&gs->dom, &gs->lum) != 5) |
170 |
|
goto readerr; |
171 |
+ |
normalize(gs->dir); |
172 |
|
gs->next = all_srcs; |
173 |
|
all_srcs = gs; |
174 |
|
break; |
239 |
|
* All vectors are assumed to be normalized. |
240 |
|
* This function is an implementation of the method proposed by |
241 |
|
* Robert Levin in his 1975 JIES article. |
242 |
+ |
* This calculation presumes the view direction and up vectors perpendicular. |
243 |
|
* We return a value less than zero for improper positions. |
244 |
|
*/ |
245 |
|
|
253 |
|
d = DOT(sd,vd); |
254 |
|
if (d <= 0.0) |
255 |
|
return(-1.0); |
256 |
+ |
if (d >= 1.0) |
257 |
+ |
return(1.0); |
258 |
|
sigma = acos(d) * (180./PI); |
259 |
< |
tau = acos(DOT(sd,vu)/sqrt(1.0-d*d)) * (180./PI); |
259 |
> |
d = DOT(sd,vu)/sqrt(1.0-d*d); |
260 |
> |
if (d >= 1.0) |
261 |
> |
tau = 0.0; |
262 |
> |
else |
263 |
> |
tau = acos(d) * (180./PI); |
264 |
|
return( exp( sigma*( (35.2 - tau*.31889 - 1.22*exp(-.22222*tau))*1e-3 |
265 |
|
+ sigma*(21. + tau*(.26667 + tau*-.002963))*1e-5 ) |
266 |
|
) ); |
268 |
|
|
269 |
|
|
270 |
|
double |
271 |
< |
gnuth_dgr(gd) /* compute Gnuth discomfort glare rating */ |
271 |
> |
guth_dgr(gd) /* compute Guth discomfort glare rating */ |
272 |
|
struct glare_dir *gd; |
273 |
|
{ |
274 |
|
#define q(w) (20.4*w+1.52*pow(w,.2)-.075) |
275 |
|
register struct glare_src *gs; |
276 |
|
double p; |
277 |
|
double sum; |
278 |
+ |
double wtot, brsum; |
279 |
|
int n; |
280 |
|
|
281 |
< |
sum = 0.0; n = 0; |
281 |
> |
sum = wtot = brsum = 0.0; n = 0; |
282 |
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
283 |
|
p = posindex(gs->dir, midview.vdir, midview.vup); |
284 |
|
if (p <= FTINY) |
285 |
|
continue; |
286 |
|
sum += gs->lum * q(gs->dom) / p; |
287 |
+ |
brsum += gs->lum * gs->dom; |
288 |
+ |
wtot += gs->dom; |
289 |
|
n++; |
290 |
|
} |
291 |
|
if (n == 0) |
292 |
|
return(0.0); |
293 |
|
else |
294 |
|
return( pow( |
295 |
< |
.5*sum/pow(direct(gd)+gd->indirect,.44), |
295 |
> |
.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
296 |
|
pow((double)n, -.0914) ) ); |
297 |
|
#undef q |
298 |
|
} |
308 |
|
|
309 |
|
|
310 |
|
double |
311 |
< |
gnuth_vcp(gd) /* compute Gnuth visual comfort probability */ |
311 |
> |
guth_vcp(gd) /* compute Guth visual comfort probability */ |
312 |
|
struct glare_dir *gd; |
313 |
|
{ |
314 |
< |
return(100.*norm_integral(-6.374+1.3227*log(gnuth_dgr(gd)))); |
314 |
> |
return(100.*norm_integral(6.374-1.3227*log(guth_dgr(gd)))); |
315 |
|
} |