1 |
greg |
1.1 |
#ifndef lint |
2 |
greg |
2.16 |
static const char RCSid[] = "$Id: glarendx.c,v 2.15 2020/02/17 19:35:24 greg Exp $"; |
3 |
greg |
1.1 |
#endif |
4 |
|
|
/* |
5 |
greg |
1.9 |
* Compute Glare Index given by program name or -t option: |
6 |
greg |
1.1 |
* |
7 |
greg |
2.4 |
* dgi - Daylight Glare Index |
8 |
|
|
* brs_gi - Building Research Station Glare Index (Petherbridge |
9 |
|
|
* & Hopkinson) |
10 |
|
|
* ugr - Unified Glare Rating System (Fischer) |
11 |
greg |
1.2 |
* guth_dgr - Guth discomfort glare rating |
12 |
|
|
* guth_vcp - Guth visual comfort probability |
13 |
greg |
1.9 |
* cie_cgi - CIE Glare Index (1983, due to Einhorn) |
14 |
|
|
* vert_dir - Direct vertical illuminance |
15 |
|
|
* vert_ind - Indirect vertical illuminance (from input) |
16 |
|
|
* vert_ill - Total vertical illuminance |
17 |
greg |
1.1 |
* |
18 |
|
|
* 12 April 1991 Greg Ward EPFL |
19 |
greg |
2.4 |
* 19 April 1993 R. Compagnon EPFL (added dgi, brs_gi, ugr) |
20 |
greg |
1.1 |
*/ |
21 |
schorsch |
2.10 |
|
22 |
schorsch |
2.8 |
#include <string.h> |
23 |
|
|
|
24 |
greg |
1.1 |
#include "standard.h" |
25 |
greg |
2.16 |
#include "paths.h" |
26 |
greg |
1.1 |
#include "view.h" |
27 |
schorsch |
2.10 |
|
28 |
|
|
|
29 |
|
|
struct glare_src { |
30 |
|
|
FVECT dir; /* source direction */ |
31 |
|
|
double dom; /* solid angle */ |
32 |
|
|
double lum; /* average luminance */ |
33 |
|
|
struct glare_src *next; |
34 |
|
|
} *all_srcs = NULL; |
35 |
|
|
|
36 |
|
|
struct glare_dir { |
37 |
|
|
double ang; /* angle (in radians) */ |
38 |
|
|
double indirect; /* indirect illuminance */ |
39 |
|
|
struct glare_dir *next; |
40 |
|
|
} *all_dirs = NULL; |
41 |
|
|
|
42 |
|
|
typedef double gdfun(struct glare_dir *gd); |
43 |
|
|
|
44 |
|
|
static gdfun dgi; |
45 |
|
|
static gdfun brs_gi; |
46 |
|
|
static gdfun ugr; |
47 |
|
|
static gdfun guth_dgr; |
48 |
|
|
static gdfun guth_vcp; |
49 |
|
|
static gdfun cie_cgi; |
50 |
|
|
static gdfun direct; |
51 |
|
|
static gdfun indirect; |
52 |
|
|
static gdfun total; |
53 |
|
|
|
54 |
|
|
static gethfunc headline; |
55 |
|
|
static void init(void); |
56 |
|
|
static void read_input(void); |
57 |
|
|
static void print_values(gdfun *func); |
58 |
|
|
static double posindex(FVECT sd, FVECT vd, FVECT vu); |
59 |
|
|
|
60 |
|
|
|
61 |
greg |
1.1 |
struct named_func { |
62 |
|
|
char *name; |
63 |
schorsch |
2.10 |
gdfun *func; |
64 |
greg |
1.9 |
char *descrip; |
65 |
greg |
1.1 |
} all_funcs[] = { |
66 |
greg |
2.4 |
{"dgi", dgi, "Daylight Glare Index"}, |
67 |
|
|
{"brs_gi", brs_gi, "BRS Glare Index"}, |
68 |
|
|
{"ugr", ugr, "Unified Glare Rating"}, |
69 |
greg |
1.9 |
{"guth_vcp", guth_vcp, "Guth Visual Comfort Probability"}, |
70 |
|
|
{"cie_cgi", cie_cgi, "CIE Glare Index (Einhorn)"}, |
71 |
|
|
{"guth_dgr", guth_dgr, "Guth Disability Glare Rating"}, |
72 |
|
|
{"vert_dir", direct, "Direct Vertical Illuminance"}, |
73 |
|
|
{"vert_ill", total, "Total Vertical Illuminance"}, |
74 |
|
|
{"vert_ind", indirect, "Indirect Vertical Illuminance"}, |
75 |
greg |
1.1 |
{NULL} |
76 |
|
|
}; |
77 |
schorsch |
2.10 |
|
78 |
greg |
1.1 |
#define newp(type) (type *)malloc(sizeof(type)) |
79 |
schorsch |
2.10 |
|
80 |
greg |
1.1 |
char *progname; |
81 |
|
|
int print_header = 1; |
82 |
schorsch |
2.10 |
|
83 |
greg |
1.1 |
VIEW midview = STDVIEW; |
84 |
schorsch |
2.10 |
|
85 |
greg |
1.4 |
int wrongformat = 0; |
86 |
schorsch |
2.10 |
|
87 |
|
|
|
88 |
|
|
int |
89 |
|
|
main( |
90 |
|
|
int argc, |
91 |
|
|
char *argv[] |
92 |
|
|
) |
93 |
greg |
1.1 |
{ |
94 |
|
|
struct named_func *funp; |
95 |
|
|
int i; |
96 |
|
|
/* get program name */ |
97 |
greg |
2.16 |
progname = fixargv0(argv[0]); |
98 |
greg |
1.1 |
/* get options */ |
99 |
|
|
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
100 |
|
|
switch (argv[i][1]) { |
101 |
|
|
case 't': |
102 |
greg |
2.16 |
progname = argv[++i]; |
103 |
greg |
1.1 |
break; |
104 |
|
|
case 'h': |
105 |
|
|
print_header = 0; |
106 |
|
|
break; |
107 |
|
|
default: |
108 |
|
|
goto userr; |
109 |
|
|
} |
110 |
|
|
if (i < argc-1) |
111 |
|
|
goto userr; |
112 |
|
|
if (i == argc-1) /* open file */ |
113 |
|
|
if (freopen(argv[i], "r", stdin) == NULL) { |
114 |
|
|
perror(argv[i]); |
115 |
|
|
exit(1); |
116 |
|
|
} |
117 |
greg |
1.9 |
/* find and run calculation */ |
118 |
greg |
1.1 |
for (funp = all_funcs; funp->name != NULL; funp++) |
119 |
greg |
2.16 |
if (!strcmp(funp->name, progname)) { |
120 |
greg |
1.9 |
init(); |
121 |
|
|
read_input(); |
122 |
|
|
if (print_header) { |
123 |
|
|
printargs(i, argv, stdout); |
124 |
|
|
putchar('\n'); |
125 |
|
|
} |
126 |
greg |
1.1 |
print_values(funp->func); |
127 |
|
|
exit(0); /* we're done */ |
128 |
|
|
} |
129 |
|
|
/* invalid function */ |
130 |
|
|
userr: |
131 |
greg |
1.9 |
fprintf(stderr, "Usage: %s -t type [-h] [input]\n", progname); |
132 |
|
|
fprintf(stderr, "\twhere 'type' is one of the following:\n"); |
133 |
|
|
for (funp = all_funcs; funp->name != NULL; funp++) |
134 |
|
|
fprintf(stderr, "\t%12s\t%s\n", funp->name, funp->descrip); |
135 |
greg |
1.1 |
exit(1); |
136 |
|
|
} |
137 |
schorsch |
2.10 |
|
138 |
|
|
|
139 |
|
|
static int |
140 |
|
|
headline( /* get line from header */ |
141 |
|
|
char *s, |
142 |
|
|
void *p |
143 |
|
|
) |
144 |
greg |
1.1 |
{ |
145 |
greg |
2.13 |
char fmt[MAXFMTLEN]; |
146 |
schorsch |
2.10 |
|
147 |
greg |
1.1 |
if (print_header) /* copy to output */ |
148 |
|
|
fputs(s, stdout); |
149 |
greg |
2.2 |
if (isview(s)) |
150 |
|
|
sscanview(&midview, s); |
151 |
greg |
1.4 |
else if (isformat(s)) { |
152 |
|
|
formatval(fmt, s); |
153 |
greg |
1.6 |
wrongformat = strcmp(fmt, "ascii"); |
154 |
greg |
1.4 |
} |
155 |
gwlarson |
2.6 |
return(0); |
156 |
greg |
1.1 |
} |
157 |
schorsch |
2.10 |
|
158 |
|
|
|
159 |
|
|
static void |
160 |
|
|
init(void) /* initialize calculation */ |
161 |
greg |
1.9 |
{ |
162 |
greg |
2.14 |
char *err; |
163 |
greg |
1.9 |
/* read header */ |
164 |
|
|
getheader(stdin, headline, NULL); |
165 |
|
|
if (wrongformat) { |
166 |
|
|
fprintf(stderr, "%s: bad input format\n", progname); |
167 |
|
|
exit(1); |
168 |
|
|
} |
169 |
|
|
/* set view */ |
170 |
greg |
2.14 |
if ((err = setview(&midview)) != NULL) { |
171 |
|
|
fprintf(stderr, "%s: %s\n", |
172 |
|
|
progname, err); |
173 |
|
|
exit(1); |
174 |
|
|
} |
175 |
|
|
if (fabs(DOT(midview.vdir, midview.vup)) > 1e-4) { |
176 |
|
|
fprintf(stderr, |
177 |
|
|
"%s: Input view direction not perpendicular to up vector\n", |
178 |
greg |
1.9 |
progname); |
179 |
|
|
exit(1); |
180 |
|
|
} |
181 |
|
|
} |
182 |
schorsch |
2.10 |
|
183 |
|
|
|
184 |
|
|
static void |
185 |
|
|
read_input(void) /* read glare sources from stdin */ |
186 |
greg |
1.1 |
{ |
187 |
|
|
#define S_SEARCH 0 |
188 |
|
|
#define S_SOURCE 1 |
189 |
|
|
#define S_DIREC 2 |
190 |
|
|
int state = S_SEARCH; |
191 |
|
|
char buf[128]; |
192 |
greg |
2.11 |
struct glare_src *gs; |
193 |
|
|
struct glare_dir *gd; |
194 |
schorsch |
2.10 |
|
195 |
greg |
1.1 |
while (fgets(buf, sizeof(buf), stdin) != NULL) |
196 |
|
|
switch (state) { |
197 |
|
|
case S_SEARCH: |
198 |
|
|
if (!strcmp(buf, "BEGIN glare source\n")) |
199 |
|
|
state = S_SOURCE; |
200 |
|
|
else if (!strcmp(buf, "BEGIN indirect illuminance\n")) |
201 |
|
|
state = S_DIREC; |
202 |
|
|
break; |
203 |
|
|
case S_SOURCE: |
204 |
|
|
if (!strncmp(buf, "END", 3)) { |
205 |
|
|
state = S_SEARCH; |
206 |
|
|
break; |
207 |
|
|
} |
208 |
|
|
if ((gs = newp(struct glare_src)) == NULL) |
209 |
|
|
goto memerr; |
210 |
greg |
2.11 |
if (sscanf(buf, FVFORMAT, &gs->dir[0], &gs->dir[1], |
211 |
|
|
&gs->dir[2]) != 3 || |
212 |
greg |
2.12 |
sscanf(sskip2(buf, 3), "%lf %lf", |
213 |
greg |
2.11 |
&gs->dom, &gs->lum) != 2) |
214 |
greg |
1.1 |
goto readerr; |
215 |
greg |
1.2 |
normalize(gs->dir); |
216 |
greg |
1.1 |
gs->next = all_srcs; |
217 |
|
|
all_srcs = gs; |
218 |
|
|
break; |
219 |
|
|
case S_DIREC: |
220 |
|
|
if (!strncmp(buf, "END", 3)) { |
221 |
|
|
state = S_SEARCH; |
222 |
|
|
break; |
223 |
|
|
} |
224 |
|
|
if ((gd = newp(struct glare_dir)) == NULL) |
225 |
|
|
goto memerr; |
226 |
|
|
if (sscanf(buf, "%lf %lf", |
227 |
|
|
&gd->ang, &gd->indirect) != 2) |
228 |
|
|
goto readerr; |
229 |
|
|
gd->ang *= PI/180.0; /* convert to radians */ |
230 |
|
|
gd->next = all_dirs; |
231 |
|
|
all_dirs = gd; |
232 |
|
|
break; |
233 |
|
|
} |
234 |
|
|
return; |
235 |
|
|
memerr: |
236 |
|
|
perror(progname); |
237 |
|
|
exit(1); |
238 |
|
|
readerr: |
239 |
|
|
fprintf(stderr, "%s: read error on input\n", progname); |
240 |
|
|
exit(1); |
241 |
|
|
#undef S_SEARCH |
242 |
|
|
#undef S_SOURCE |
243 |
|
|
#undef S_DIREC |
244 |
|
|
} |
245 |
schorsch |
2.10 |
|
246 |
|
|
|
247 |
|
|
static void |
248 |
|
|
print_values( /* print out calculations */ |
249 |
|
|
gdfun *func |
250 |
|
|
) |
251 |
greg |
1.1 |
{ |
252 |
greg |
2.11 |
struct glare_dir *gd; |
253 |
schorsch |
2.10 |
|
254 |
greg |
1.1 |
for (gd = all_dirs; gd != NULL; gd = gd->next) |
255 |
schorsch |
2.10 |
printf("%f\t%f\n", gd->ang*(180.0/PI), (*func)(gd)); |
256 |
greg |
1.1 |
} |
257 |
schorsch |
2.10 |
|
258 |
|
|
|
259 |
|
|
static double |
260 |
|
|
direct( /* compute direct vertical illuminance */ |
261 |
|
|
struct glare_dir *gd |
262 |
|
|
) |
263 |
greg |
1.1 |
{ |
264 |
|
|
FVECT mydir; |
265 |
|
|
double d, dval; |
266 |
greg |
2.11 |
struct glare_src *gs; |
267 |
schorsch |
2.10 |
|
268 |
greg |
1.1 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
269 |
|
|
dval = 0.0; |
270 |
|
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
271 |
|
|
d = DOT(mydir,gs->dir); |
272 |
|
|
if (d > FTINY) |
273 |
|
|
dval += d * gs->dom * gs->lum; |
274 |
|
|
} |
275 |
|
|
return(dval); |
276 |
greg |
1.9 |
} |
277 |
schorsch |
2.10 |
|
278 |
|
|
|
279 |
|
|
static double |
280 |
|
|
indirect( /* return indirect vertical illuminance */ |
281 |
|
|
struct glare_dir *gd |
282 |
|
|
) |
283 |
greg |
1.9 |
{ |
284 |
|
|
return(gd->indirect); |
285 |
|
|
} |
286 |
schorsch |
2.10 |
|
287 |
|
|
|
288 |
|
|
static double |
289 |
|
|
total( /* return total vertical illuminance */ |
290 |
|
|
struct glare_dir *gd |
291 |
|
|
) |
292 |
greg |
1.9 |
{ |
293 |
|
|
return(direct(gd)+gd->indirect); |
294 |
greg |
1.1 |
} |
295 |
schorsch |
2.10 |
|
296 |
|
|
|
297 |
greg |
1.1 |
/* |
298 |
|
|
* posindex - compute glare position index from: |
299 |
|
|
* |
300 |
|
|
* Source Direction |
301 |
|
|
* View Direction |
302 |
|
|
* View Up Direction |
303 |
|
|
* |
304 |
|
|
* All vectors are assumed to be normalized. |
305 |
|
|
* This function is an implementation of the method proposed by |
306 |
|
|
* Robert Levin in his 1975 JIES article. |
307 |
greg |
1.5 |
* This calculation presumes the view direction and up vectors perpendicular. |
308 |
greg |
1.1 |
* We return a value less than zero for improper positions. |
309 |
|
|
*/ |
310 |
schorsch |
2.10 |
|
311 |
|
|
static double |
312 |
|
|
posindex( /* compute position index */ |
313 |
|
|
FVECT sd, |
314 |
|
|
FVECT vd, |
315 |
|
|
FVECT vu |
316 |
|
|
) |
317 |
greg |
1.1 |
{ |
318 |
|
|
double sigma, tau; |
319 |
|
|
double d; |
320 |
schorsch |
2.10 |
|
321 |
greg |
1.1 |
d = DOT(sd,vd); |
322 |
|
|
if (d <= 0.0) |
323 |
|
|
return(-1.0); |
324 |
greg |
2.14 |
if (d >= 1.0-FTINY) |
325 |
greg |
1.5 |
return(1.0); |
326 |
greg |
1.1 |
sigma = acos(d) * (180./PI); |
327 |
greg |
2.4 |
d = fabs(DOT(sd,vu)/sqrt(1.0-d*d)); |
328 |
greg |
2.14 |
tau = Acos(d) * (180./PI); |
329 |
greg |
1.1 |
return( exp( sigma*( (35.2 - tau*.31889 - 1.22*exp(-.22222*tau))*1e-3 |
330 |
|
|
+ sigma*(21. + tau*(.26667 + tau*-.002963))*1e-5 ) |
331 |
|
|
) ); |
332 |
|
|
} |
333 |
schorsch |
2.10 |
|
334 |
|
|
|
335 |
|
|
static double |
336 |
|
|
dgi( /* compute Daylight Glare Index */ |
337 |
|
|
struct glare_dir *gd |
338 |
|
|
) |
339 |
greg |
2.4 |
{ |
340 |
greg |
2.11 |
struct glare_src *gs; |
341 |
greg |
2.4 |
FVECT mydir,testdir[7],vhor; |
342 |
greg |
2.9 |
double r,posn,omega,p[7],sum; |
343 |
greg |
2.14 |
int i; |
344 |
schorsch |
2.10 |
|
345 |
greg |
2.4 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
346 |
greg |
2.14 |
sum = 0.0; |
347 |
greg |
2.4 |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
348 |
greg |
1.1 |
|
349 |
greg |
2.4 |
/* compute 1/p^2 weighted solid angle of the source */ |
350 |
greg |
2.14 |
r = 1. - gs->dom*(.5/PI); |
351 |
|
|
r = sqrt(1. - r*r); |
352 |
greg |
2.4 |
fcross(vhor,gs->dir,midview.vup); |
353 |
greg |
2.14 |
if (normalize(vhor) == 0.) |
354 |
|
|
continue; |
355 |
greg |
2.4 |
VCOPY(testdir[0],gs->dir); |
356 |
|
|
fvsum(testdir[1],gs->dir,vhor,r); |
357 |
|
|
fvsum(testdir[2],gs->dir,vhor,0.5*r); |
358 |
|
|
fvsum(testdir[5],testdir[2],midview.vup,-0.866*r); |
359 |
|
|
fvsum(testdir[2],testdir[2],midview.vup,0.866*r); |
360 |
|
|
fvsum(testdir[3],gs->dir,vhor,-r); |
361 |
|
|
fvsum(testdir[4],gs->dir,vhor,-0.5*r); |
362 |
|
|
fvsum(testdir[6],testdir[4],midview.vup,0.866*r); |
363 |
|
|
fvsum(testdir[4],testdir[4],midview.vup,-0.866*r); |
364 |
|
|
for (i = 0; i < 7; i++) { |
365 |
greg |
2.14 |
p[i] = 0.0; |
366 |
|
|
if (normalize(testdir[i]) == 0.) |
367 |
|
|
continue; |
368 |
greg |
2.9 |
posn = posindex(testdir[i],mydir,midview.vup); |
369 |
greg |
2.14 |
if (posn > FTINY) |
370 |
greg |
2.9 |
p[i] = 1./(posn*posn); |
371 |
greg |
2.4 |
} |
372 |
greg |
2.14 |
r = 1. - gs->dom*(.5/PI); |
373 |
greg |
2.4 |
omega = gs->dom*p[0]; |
374 |
greg |
2.14 |
omega += (r*PI*(1.+1./(r*r))-2.*PI)*(-p[0]+(p[1]+p[2])*0.5); |
375 |
|
|
omega += (2.*PI-r*PI*(1.+1./(r*r)))*(-p[0]-0.1667*(p[1]+p[3]) |
376 |
greg |
2.4 |
+0.3334*(p[2]+p[4]+p[5]+p[6])); |
377 |
greg |
2.14 |
if (omega <= 0.) |
378 |
greg |
2.15 |
continue; |
379 |
schorsch |
2.10 |
sum += pow(gs->lum,1.6) * pow(omega,0.8) / |
380 |
greg |
2.14 |
(gd->indirect*(1./PI) + 0.07*sqrt(gs->dom)*gs->lum); |
381 |
greg |
2.4 |
} |
382 |
greg |
2.14 |
if (sum <= FTINY) |
383 |
greg |
2.4 |
return(0.0); |
384 |
greg |
2.14 |
return( 10.*log10(0.478*sum) ); |
385 |
greg |
2.4 |
} |
386 |
|
|
|
387 |
schorsch |
2.10 |
|
388 |
|
|
static double |
389 |
|
|
brs_gi( /* compute BRS Glare Index */ |
390 |
|
|
struct glare_dir *gd |
391 |
|
|
) |
392 |
greg |
2.4 |
{ |
393 |
greg |
2.11 |
struct glare_src *gs; |
394 |
greg |
2.4 |
FVECT mydir; |
395 |
|
|
double p; |
396 |
|
|
double sum; |
397 |
schorsch |
2.10 |
|
398 |
greg |
2.4 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
399 |
|
|
sum = 0.0; |
400 |
|
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
401 |
|
|
p = posindex(gs->dir, mydir, midview.vup); |
402 |
|
|
if (p <= FTINY) |
403 |
|
|
continue; |
404 |
|
|
sum += pow(gs->lum/p,1.6) * pow(gs->dom,0.8); |
405 |
|
|
} |
406 |
|
|
if (sum <= FTINY) |
407 |
|
|
return(0.0); |
408 |
greg |
2.14 |
sum *= PI/gd->indirect; |
409 |
greg |
2.4 |
return(10*log10(0.478*sum)); |
410 |
|
|
} |
411 |
|
|
|
412 |
|
|
|
413 |
schorsch |
2.10 |
static double |
414 |
|
|
guth_dgr( /* compute Guth discomfort glare rating */ |
415 |
|
|
struct glare_dir *gd |
416 |
|
|
) |
417 |
greg |
1.1 |
{ |
418 |
|
|
#define q(w) (20.4*w+1.52*pow(w,.2)-.075) |
419 |
greg |
2.11 |
struct glare_src *gs; |
420 |
greg |
1.7 |
FVECT mydir; |
421 |
greg |
1.1 |
double p; |
422 |
|
|
double sum; |
423 |
greg |
1.3 |
double wtot, brsum; |
424 |
greg |
1.1 |
int n; |
425 |
schorsch |
2.10 |
|
426 |
greg |
1.7 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
427 |
greg |
1.3 |
sum = wtot = brsum = 0.0; n = 0; |
428 |
greg |
1.1 |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
429 |
greg |
1.7 |
p = posindex(gs->dir, mydir, midview.vup); |
430 |
greg |
1.1 |
if (p <= FTINY) |
431 |
|
|
continue; |
432 |
|
|
sum += gs->lum * q(gs->dom) / p; |
433 |
greg |
1.3 |
brsum += gs->lum * gs->dom; |
434 |
|
|
wtot += gs->dom; |
435 |
greg |
1.1 |
n++; |
436 |
|
|
} |
437 |
|
|
if (n == 0) |
438 |
|
|
return(0.0); |
439 |
greg |
1.8 |
return( pow(.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
440 |
greg |
1.1 |
pow((double)n, -.0914) ) ); |
441 |
|
|
#undef q |
442 |
|
|
} |
443 |
schorsch |
2.10 |
|
444 |
|
|
|
445 |
greg |
1.1 |
#ifndef M_SQRT2 |
446 |
|
|
#define M_SQRT2 1.41421356237309504880 |
447 |
|
|
#endif |
448 |
schorsch |
2.10 |
|
449 |
greg |
1.1 |
#define norm_integral(z) (1.-.5*erfc((z)/M_SQRT2)) |
450 |
schorsch |
2.10 |
|
451 |
|
|
|
452 |
|
|
static double |
453 |
|
|
guth_vcp( /* compute Guth visual comfort probability */ |
454 |
|
|
struct glare_dir *gd |
455 |
|
|
) |
456 |
greg |
1.1 |
{ |
457 |
greg |
2.5 |
extern double erfc(); |
458 |
greg |
1.7 |
double dgr; |
459 |
schorsch |
2.10 |
|
460 |
greg |
1.7 |
dgr = guth_dgr(gd); |
461 |
|
|
if (dgr <= FTINY) |
462 |
|
|
return(100.0); |
463 |
|
|
return(100.*norm_integral(6.374-1.3227*log(dgr))); |
464 |
greg |
1.8 |
} |
465 |
schorsch |
2.10 |
|
466 |
|
|
|
467 |
|
|
static double |
468 |
|
|
cie_cgi( /* compute CIE Glare Index */ |
469 |
|
|
struct glare_dir *gd |
470 |
|
|
) |
471 |
greg |
1.8 |
{ |
472 |
greg |
2.11 |
struct glare_src *gs; |
473 |
greg |
1.8 |
FVECT mydir; |
474 |
|
|
double dillum; |
475 |
|
|
double p; |
476 |
|
|
double sum; |
477 |
schorsch |
2.10 |
|
478 |
greg |
1.8 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
479 |
|
|
sum = 0.0; |
480 |
|
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
481 |
|
|
p = posindex(gs->dir, mydir, midview.vup); |
482 |
|
|
if (p <= FTINY) |
483 |
|
|
continue; |
484 |
|
|
sum += gs->lum*gs->lum * gs->dom / (p*p); |
485 |
|
|
} |
486 |
|
|
if (sum <= FTINY) |
487 |
|
|
return(0.0); |
488 |
|
|
dillum = direct(gd); |
489 |
|
|
return(8.*log10(2.*sum*(1.+dillum/500.)/(dillum+gd->indirect))); |
490 |
greg |
2.4 |
} |
491 |
|
|
|
492 |
|
|
|
493 |
schorsch |
2.10 |
static double |
494 |
|
|
ugr( /* compute Unified Glare Rating */ |
495 |
|
|
struct glare_dir *gd |
496 |
|
|
) |
497 |
greg |
2.4 |
{ |
498 |
greg |
2.11 |
struct glare_src *gs; |
499 |
greg |
2.4 |
FVECT mydir; |
500 |
|
|
double p; |
501 |
|
|
double sum; |
502 |
schorsch |
2.10 |
|
503 |
greg |
2.4 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
504 |
|
|
sum = 0.0; |
505 |
|
|
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
506 |
|
|
p = posindex(gs->dir, mydir, midview.vup); |
507 |
|
|
if (p <= FTINY) |
508 |
|
|
continue; |
509 |
|
|
sum += gs->lum*gs->lum * gs->dom / (p*p); |
510 |
|
|
} |
511 |
|
|
if (sum <= FTINY) |
512 |
|
|
return(0.0); |
513 |
|
|
return(8.*log10(0.25*sum*PI/gd->indirect)); |
514 |
greg |
1.1 |
} |