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/* Copyright (c) 1991 Regents of the University of California */ |
2 |
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|
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
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|
4 |
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/* |
5 |
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* Compute Glare Index given by program name: |
5 |
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* Compute Glare Index given by program name or -t option: |
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* |
7 |
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* dgi - Daylight Glare Index |
8 |
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* brs_gi - Building Research Station Glare Index (Petherbridge |
9 |
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* & Hopkinson) |
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* ugr - Unified Glare Rating System (Fischer) |
11 |
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* guth_dgr - Guth discomfort glare rating |
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* guth_vcp - Guth visual comfort probability |
13 |
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* cie_cgi - CIE Glare Index (1983, due to Einhorn) |
14 |
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* vert_dir - Direct vertical illuminance |
15 |
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* vert_ind - Indirect vertical illuminance (from input) |
16 |
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* vert_ill - Total vertical illuminance |
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* |
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* 12 April 1991 Greg Ward EPFL |
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* 19 April 1993 R. Compagnon EPFL (added dgi, brs_gi, ugr) |
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*/ |
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|
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#include <string.h> |
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|
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#include "standard.h" |
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#include "view.h" |
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|
19 |
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extern double erfc(); |
27 |
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|
21 |
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double posindex(); |
22 |
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int headline(); |
23 |
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|
24 |
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double direct(), guth_dgr(), guth_vcp(); |
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|
26 |
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struct named_func { |
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char *name; |
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double (*func)(); |
29 |
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} all_funcs[] = { |
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{"direct", direct}, |
31 |
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{"guth_dgr", guth_dgr}, |
32 |
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{"guth_vcp", guth_vcp}, |
33 |
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{NULL} |
34 |
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}; |
35 |
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|
28 |
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struct glare_src { |
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FVECT dir; /* source direction */ |
30 |
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double dom; /* solid angle */ |
38 |
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struct glare_dir *next; |
39 |
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} *all_dirs = NULL; |
40 |
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|
41 |
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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 |
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|
53 |
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static gethfunc headline; |
54 |
+ |
static void init(void); |
55 |
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static void read_input(void); |
56 |
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static void print_values(gdfun *func); |
57 |
+ |
static double posindex(FVECT sd, FVECT vd, FVECT vu); |
58 |
+ |
|
59 |
+ |
|
60 |
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struct named_func { |
61 |
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char *name; |
62 |
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gdfun *func; |
63 |
+ |
char *descrip; |
64 |
+ |
} all_funcs[] = { |
65 |
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{"dgi", dgi, "Daylight Glare Index"}, |
66 |
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{"brs_gi", brs_gi, "BRS Glare Index"}, |
67 |
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{"ugr", ugr, "Unified Glare Rating"}, |
68 |
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{"guth_vcp", guth_vcp, "Guth Visual Comfort Probability"}, |
69 |
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{"cie_cgi", cie_cgi, "CIE Glare Index (Einhorn)"}, |
70 |
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{"guth_dgr", guth_dgr, "Guth Disability Glare Rating"}, |
71 |
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{"vert_dir", direct, "Direct Vertical Illuminance"}, |
72 |
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{"vert_ill", total, "Total Vertical Illuminance"}, |
73 |
+ |
{"vert_ind", indirect, "Indirect Vertical Illuminance"}, |
74 |
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{NULL} |
75 |
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}; |
76 |
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|
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#define newp(type) (type *)malloc(sizeof(type)) |
78 |
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|
79 |
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char *progname; |
81 |
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|
82 |
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VIEW midview = STDVIEW; |
83 |
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|
84 |
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int wrongformat = 0; |
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|
86 |
< |
main(argc, argv) |
87 |
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int argc; |
88 |
< |
char *argv[]; |
86 |
> |
|
87 |
> |
int |
88 |
> |
main( |
89 |
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int argc, |
90 |
> |
char *argv[] |
91 |
> |
) |
92 |
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{ |
61 |
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extern char *rindex(); |
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struct named_func *funp; |
94 |
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char *progtail; |
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int i; |
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/* get program name */ |
97 |
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progname = argv[0]; |
98 |
< |
progtail = rindex(progname, '/'); /* final component */ |
98 |
> |
progtail = strrchr(progname, '/'); /* final component */ |
99 |
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if (progtail == NULL) |
100 |
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progtail = progname; |
101 |
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else |
119 |
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perror(argv[i]); |
120 |
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exit(1); |
121 |
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} |
122 |
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/* read header */ |
92 |
< |
getheader(stdin, headline); |
93 |
< |
if (print_header) { /* add to header */ |
94 |
< |
printargs(i, argv, stdout); |
95 |
< |
putchar('\n'); |
96 |
< |
} |
97 |
< |
/* set view */ |
98 |
< |
if (setview(&midview) != NULL) { |
99 |
< |
fprintf(stderr, "%s: bad view information in input\n"); |
100 |
< |
exit(1); |
101 |
< |
} |
102 |
< |
/* get findglare data */ |
103 |
< |
read_input(); |
104 |
< |
/* find calculation */ |
122 |
> |
/* find and run calculation */ |
123 |
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for (funp = all_funcs; funp->name != NULL; funp++) |
124 |
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if (!strcmp(funp->name, progtail)) { |
125 |
+ |
init(); |
126 |
+ |
read_input(); |
127 |
+ |
if (print_header) { |
128 |
+ |
printargs(i, argv, stdout); |
129 |
+ |
putchar('\n'); |
130 |
+ |
} |
131 |
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print_values(funp->func); |
132 |
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exit(0); /* we're done */ |
133 |
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} |
134 |
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/* invalid function */ |
111 |
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fprintf(stderr, "%s: unknown function!\n", progtail); |
112 |
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exit(1); |
135 |
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userr: |
136 |
< |
fprintf(stderr, "Usage: %s [-t type][-h] [input]\n", progname); |
136 |
> |
fprintf(stderr, "Usage: %s -t type [-h] [input]\n", progname); |
137 |
> |
fprintf(stderr, "\twhere 'type' is one of the following:\n"); |
138 |
> |
for (funp = all_funcs; funp->name != NULL; funp++) |
139 |
> |
fprintf(stderr, "\t%12s\t%s\n", funp->name, funp->descrip); |
140 |
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exit(1); |
141 |
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} |
142 |
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|
143 |
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|
144 |
< |
headline(s) /* get line from header */ |
145 |
< |
char *s; |
144 |
> |
static int |
145 |
> |
headline( /* get line from header */ |
146 |
> |
char *s, |
147 |
> |
void *p |
148 |
> |
) |
149 |
|
{ |
150 |
+ |
char fmt[MAXFMTLEN]; |
151 |
+ |
|
152 |
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if (print_header) /* copy to output */ |
153 |
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fputs(s, stdout); |
154 |
< |
if (!strncmp(s, VIEWSTR, VIEWSTRL)) |
155 |
< |
sscanview(&midview, s+VIEWSTRL); |
154 |
> |
if (isview(s)) |
155 |
> |
sscanview(&midview, s); |
156 |
> |
else if (isformat(s)) { |
157 |
> |
formatval(fmt, s); |
158 |
> |
wrongformat = strcmp(fmt, "ascii"); |
159 |
> |
} |
160 |
> |
return(0); |
161 |
|
} |
162 |
|
|
163 |
|
|
164 |
< |
read_input() /* read glare sources from stdin */ |
164 |
> |
static void |
165 |
> |
init(void) /* initialize calculation */ |
166 |
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{ |
167 |
+ |
char *err; |
168 |
+ |
/* read header */ |
169 |
+ |
getheader(stdin, headline, NULL); |
170 |
+ |
if (wrongformat) { |
171 |
+ |
fprintf(stderr, "%s: bad input format\n", progname); |
172 |
+ |
exit(1); |
173 |
+ |
} |
174 |
+ |
/* set view */ |
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 |
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} |
186 |
+ |
} |
187 |
+ |
|
188 |
+ |
|
189 |
+ |
static void |
190 |
+ |
read_input(void) /* read glare sources from stdin */ |
191 |
+ |
{ |
192 |
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#define S_SEARCH 0 |
193 |
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#define S_SOURCE 1 |
194 |
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#define S_DIREC 2 |
195 |
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int state = S_SEARCH; |
196 |
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char buf[128]; |
197 |
< |
register struct glare_src *gs; |
198 |
< |
register struct glare_dir *gd; |
197 |
> |
struct glare_src *gs; |
198 |
> |
struct glare_dir *gd; |
199 |
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|
200 |
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while (fgets(buf, sizeof(buf), stdin) != NULL) |
201 |
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switch (state) { |
212 |
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} |
213 |
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if ((gs = newp(struct glare_src)) == NULL) |
214 |
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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 |
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goto readerr; |
220 |
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normalize(gs->dir); |
221 |
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gs->next = all_srcs; |
249 |
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} |
250 |
|
|
251 |
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|
252 |
< |
print_values(funp) /* print out calculations */ |
253 |
< |
double (*funp)(); |
252 |
> |
static void |
253 |
> |
print_values( /* print out calculations */ |
254 |
> |
gdfun *func |
255 |
> |
) |
256 |
|
{ |
257 |
< |
register struct glare_dir *gd; |
257 |
> |
struct glare_dir *gd; |
258 |
|
|
259 |
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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 |
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} |
262 |
|
|
263 |
|
|
264 |
< |
double |
265 |
< |
direct(gd) /* compute direct illuminance */ |
266 |
< |
struct glare_dir *gd; |
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; |
271 |
> |
struct glare_src *gs; |
272 |
|
|
273 |
|
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
274 |
|
dval = 0.0; |
281 |
|
} |
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 |
+ |
static double |
294 |
+ |
total( /* return total vertical illuminance */ |
295 |
+ |
struct glare_dir *gd |
296 |
+ |
) |
297 |
+ |
{ |
298 |
+ |
return(direct(gd)+gd->indirect); |
299 |
+ |
} |
300 |
+ |
|
301 |
+ |
|
302 |
|
/* |
303 |
|
* posindex - compute glare position index from: |
304 |
|
* |
309 |
|
* All vectors are assumed to be normalized. |
310 |
|
* This function is an implementation of the method proposed by |
311 |
|
* Robert Levin in his 1975 JIES article. |
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; |
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; |
326 |
|
d = DOT(sd,vd); |
327 |
|
if (d <= 0.0) |
328 |
|
return(-1.0); |
329 |
+ |
if (d >= 1.0-FTINY) |
330 |
+ |
return(1.0); |
331 |
|
sigma = acos(d) * (180./PI); |
332 |
< |
tau = acos(DOT(sd,vu)/sqrt(1.0-d*d)) * (180./PI); |
332 |
> |
d = fabs(DOT(sd,vu)/sqrt(1.0-d*d)); |
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 |
< |
guth_dgr(gd) /* compute Guth discomfort glare rating */ |
342 |
< |
struct glare_dir *gd; |
340 |
> |
static double |
341 |
> |
dgi( /* compute Daylight Glare Index */ |
342 |
> |
struct glare_dir *gd |
343 |
> |
) |
344 |
|
{ |
345 |
+ |
struct glare_src *gs; |
346 |
+ |
FVECT mydir,testdir[7],vhor; |
347 |
+ |
double r,posn,omega,p[7],sum; |
348 |
+ |
int i; |
349 |
+ |
|
350 |
+ |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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 = 1. - gs->dom*(.5/PI); |
356 |
+ |
r = sqrt(1. - r*r); |
357 |
+ |
fcross(vhor,gs->dir,midview.vup); |
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); |
363 |
+ |
fvsum(testdir[5],testdir[2],midview.vup,-0.866*r); |
364 |
+ |
fvsum(testdir[2],testdir[2],midview.vup,0.866*r); |
365 |
+ |
fvsum(testdir[3],gs->dir,vhor,-r); |
366 |
+ |
fvsum(testdir[4],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 |
+ |
p[i] = 0.0; |
371 |
+ |
if (normalize(testdir[i]) == 0.) |
372 |
+ |
continue; |
373 |
+ |
posn = posindex(testdir[i],mydir,midview.vup); |
374 |
+ |
if (posn > FTINY) |
375 |
+ |
p[i] = 1./(posn*posn); |
376 |
+ |
} |
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]) |
381 |
+ |
+0.3334*(p[2]+p[4]+p[5]+p[6])); |
382 |
+ |
if (omega <= 0.) |
383 |
+ |
omega = 0.; |
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 (sum <= FTINY) |
388 |
+ |
return(0.0); |
389 |
+ |
return( 10.*log10(0.478*sum) ); |
390 |
+ |
} |
391 |
+ |
|
392 |
+ |
|
393 |
+ |
static double |
394 |
+ |
brs_gi( /* compute BRS Glare Index */ |
395 |
+ |
struct glare_dir *gd |
396 |
+ |
) |
397 |
+ |
{ |
398 |
+ |
struct glare_src *gs; |
399 |
+ |
FVECT mydir; |
400 |
+ |
double p; |
401 |
+ |
double sum; |
402 |
+ |
|
403 |
+ |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
404 |
+ |
sum = 0.0; |
405 |
+ |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
406 |
+ |
p = posindex(gs->dir, mydir, midview.vup); |
407 |
+ |
if (p <= FTINY) |
408 |
+ |
continue; |
409 |
+ |
sum += pow(gs->lum/p,1.6) * pow(gs->dom,0.8); |
410 |
+ |
} |
411 |
+ |
if (sum <= FTINY) |
412 |
+ |
return(0.0); |
413 |
+ |
sum *= PI/gd->indirect; |
414 |
+ |
return(10*log10(0.478*sum)); |
415 |
+ |
} |
416 |
+ |
|
417 |
+ |
|
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 |
|
|
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) { |
434 |
< |
p = posindex(gs->dir, midview.vdir, midview.vup); |
434 |
> |
p = posindex(gs->dir, mydir, midview.vup); |
435 |
|
if (p <= FTINY) |
436 |
|
continue; |
437 |
|
sum += gs->lum * q(gs->dom) / p; |
441 |
|
} |
442 |
|
if (n == 0) |
443 |
|
return(0.0); |
444 |
< |
else |
274 |
< |
return( pow( |
275 |
< |
.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
444 |
> |
return( pow(.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
445 |
|
pow((double)n, -.0914) ) ); |
446 |
|
#undef q |
447 |
|
} |
448 |
|
|
449 |
|
|
281 |
– |
extern double erf(), erfc(); |
282 |
– |
|
450 |
|
#ifndef M_SQRT2 |
451 |
|
#define M_SQRT2 1.41421356237309504880 |
452 |
|
#endif |
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; |
457 |
> |
static double |
458 |
> |
guth_vcp( /* compute Guth visual comfort probability */ |
459 |
> |
struct glare_dir *gd |
460 |
> |
) |
461 |
|
{ |
462 |
< |
return(100.*norm_integral(6.374-1.3227*log(guth_dgr(gd)))); |
462 |
> |
extern double erfc(); |
463 |
> |
double dgr; |
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 |
> |
static double |
473 |
> |
cie_cgi( /* compute CIE Glare Index */ |
474 |
> |
struct glare_dir *gd |
475 |
> |
) |
476 |
> |
{ |
477 |
> |
struct glare_src *gs; |
478 |
> |
FVECT mydir; |
479 |
> |
double dillum; |
480 |
> |
double p; |
481 |
> |
double sum; |
482 |
> |
|
483 |
> |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
484 |
> |
sum = 0.0; |
485 |
> |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
486 |
> |
p = posindex(gs->dir, mydir, midview.vup); |
487 |
> |
if (p <= FTINY) |
488 |
> |
continue; |
489 |
> |
sum += gs->lum*gs->lum * gs->dom / (p*p); |
490 |
> |
} |
491 |
> |
if (sum <= FTINY) |
492 |
> |
return(0.0); |
493 |
> |
dillum = direct(gd); |
494 |
> |
return(8.*log10(2.*sum*(1.+dillum/500.)/(dillum+gd->indirect))); |
495 |
> |
} |
496 |
> |
|
497 |
> |
|
498 |
> |
static double |
499 |
> |
ugr( /* compute Unified Glare Rating */ |
500 |
> |
struct glare_dir *gd |
501 |
> |
) |
502 |
> |
{ |
503 |
> |
struct glare_src *gs; |
504 |
> |
FVECT mydir; |
505 |
> |
double p; |
506 |
> |
double sum; |
507 |
> |
|
508 |
> |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
509 |
> |
sum = 0.0; |
510 |
> |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
511 |
> |
p = posindex(gs->dir, mydir, midview.vup); |
512 |
> |
if (p <= FTINY) |
513 |
> |
continue; |
514 |
> |
sum += gs->lum*gs->lum * gs->dom / (p*p); |
515 |
> |
} |
516 |
> |
if (sum <= FTINY) |
517 |
> |
return(0.0); |
518 |
> |
return(8.*log10(0.25*sum*PI/gd->indirect)); |
519 |
|
} |