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greg |
1.1 |
/* Copyright (c) 1991 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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greg |
1.9 |
* Compute Glare Index given by program name or -t option: |
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greg |
1.1 |
* |
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greg |
1.2 |
* guth_dgr - Guth discomfort glare rating |
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* guth_vcp - Guth visual comfort probability |
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greg |
1.9 |
* cie_cgi - CIE Glare Index (1983, due to Einhorn) |
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* vert_dir - Direct vertical illuminance |
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* vert_ind - Indirect vertical illuminance (from input) |
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* vert_ill - Total vertical illuminance |
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greg |
1.1 |
* |
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* 12 April 1991 Greg Ward EPFL |
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*/ |
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#include "standard.h" |
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#include "view.h" |
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extern double erfc(); |
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double posindex(); |
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greg |
1.9 |
double direct(), guth_dgr(), guth_vcp(), cie_cgi(), |
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indirect(), total(); |
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greg |
1.1 |
|
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struct named_func { |
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char *name; |
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double (*func)(); |
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greg |
1.9 |
char *descrip; |
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greg |
1.1 |
} all_funcs[] = { |
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greg |
1.9 |
{"guth_vcp", guth_vcp, "Guth Visual Comfort Probability"}, |
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{"cie_cgi", cie_cgi, "CIE Glare Index (Einhorn)"}, |
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{"guth_dgr", guth_dgr, "Guth Disability Glare Rating"}, |
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{"vert_dir", direct, "Direct Vertical Illuminance"}, |
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{"vert_ill", total, "Total Vertical Illuminance"}, |
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{"vert_ind", indirect, "Indirect Vertical Illuminance"}, |
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greg |
1.1 |
{NULL} |
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}; |
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struct glare_src { |
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FVECT dir; /* source direction */ |
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double dom; /* solid angle */ |
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double lum; /* average luminance */ |
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struct glare_src *next; |
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} *all_srcs = NULL; |
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struct glare_dir { |
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double ang; /* angle (in radians) */ |
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double indirect; /* indirect illuminance */ |
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struct glare_dir *next; |
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} *all_dirs = NULL; |
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#define newp(type) (type *)malloc(sizeof(type)) |
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char *progname; |
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int print_header = 1; |
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VIEW midview = STDVIEW; |
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greg |
1.4 |
int wrongformat = 0; |
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greg |
1.1 |
|
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greg |
1.4 |
|
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greg |
1.1 |
main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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extern char *rindex(); |
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struct named_func *funp; |
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char *progtail; |
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int i; |
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/* get program name */ |
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progname = argv[0]; |
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progtail = rindex(progname, '/'); /* final component */ |
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if (progtail == NULL) |
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progtail = progname; |
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else |
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progtail++; |
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/* get options */ |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 't': |
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progtail = argv[++i]; |
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break; |
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case 'h': |
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print_header = 0; |
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break; |
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default: |
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goto userr; |
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} |
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if (i < argc-1) |
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goto userr; |
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if (i == argc-1) /* open file */ |
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if (freopen(argv[i], "r", stdin) == NULL) { |
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perror(argv[i]); |
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exit(1); |
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} |
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greg |
1.9 |
/* find and run calculation */ |
102 |
greg |
1.1 |
for (funp = all_funcs; funp->name != NULL; funp++) |
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if (!strcmp(funp->name, progtail)) { |
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greg |
1.9 |
init(); |
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read_input(); |
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if (print_header) { |
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printargs(i, argv, stdout); |
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putchar('\n'); |
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} |
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greg |
1.1 |
print_values(funp->func); |
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exit(0); /* we're done */ |
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} |
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/* invalid function */ |
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userr: |
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greg |
1.9 |
fprintf(stderr, "Usage: %s -t type [-h] [input]\n", progname); |
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fprintf(stderr, "\twhere 'type' is one of the following:\n"); |
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for (funp = all_funcs; funp->name != NULL; funp++) |
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fprintf(stderr, "\t%12s\t%s\n", funp->name, funp->descrip); |
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greg |
1.1 |
exit(1); |
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} |
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headline(s) /* get line from header */ |
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char *s; |
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{ |
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greg |
1.4 |
char fmt[32]; |
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greg |
1.1 |
if (print_header) /* copy to output */ |
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fputs(s, stdout); |
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if (!strncmp(s, VIEWSTR, VIEWSTRL)) |
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sscanview(&midview, s+VIEWSTRL); |
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greg |
1.4 |
else if (isformat(s)) { |
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formatval(fmt, s); |
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greg |
1.6 |
wrongformat = strcmp(fmt, "ascii"); |
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greg |
1.4 |
} |
136 |
greg |
1.1 |
} |
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greg |
1.9 |
init() /* initialize calculation */ |
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{ |
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/* read header */ |
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getheader(stdin, headline, NULL); |
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if (wrongformat) { |
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fprintf(stderr, "%s: bad input format\n", progname); |
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exit(1); |
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} |
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/* set view */ |
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if (setview(&midview) != NULL) { |
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fprintf(stderr, "%s: bad view information in input\n", |
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progname); |
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exit(1); |
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} |
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} |
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greg |
1.1 |
read_input() /* read glare sources from stdin */ |
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{ |
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#define S_SEARCH 0 |
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#define S_SOURCE 1 |
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#define S_DIREC 2 |
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int state = S_SEARCH; |
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char buf[128]; |
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register struct glare_src *gs; |
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register struct glare_dir *gd; |
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while (fgets(buf, sizeof(buf), stdin) != NULL) |
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switch (state) { |
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case S_SEARCH: |
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if (!strcmp(buf, "BEGIN glare source\n")) |
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state = S_SOURCE; |
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else if (!strcmp(buf, "BEGIN indirect illuminance\n")) |
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state = S_DIREC; |
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break; |
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case S_SOURCE: |
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if (!strncmp(buf, "END", 3)) { |
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state = S_SEARCH; |
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break; |
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} |
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if ((gs = newp(struct glare_src)) == NULL) |
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goto memerr; |
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if (sscanf(buf, "%lf %lf %lf %lf %lf", |
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&gs->dir[0], &gs->dir[1], &gs->dir[2], |
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&gs->dom, &gs->lum) != 5) |
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goto readerr; |
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greg |
1.2 |
normalize(gs->dir); |
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greg |
1.1 |
gs->next = all_srcs; |
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all_srcs = gs; |
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break; |
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case S_DIREC: |
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if (!strncmp(buf, "END", 3)) { |
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state = S_SEARCH; |
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break; |
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} |
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if ((gd = newp(struct glare_dir)) == NULL) |
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goto memerr; |
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if (sscanf(buf, "%lf %lf", |
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&gd->ang, &gd->indirect) != 2) |
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goto readerr; |
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gd->ang *= PI/180.0; /* convert to radians */ |
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gd->next = all_dirs; |
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all_dirs = gd; |
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break; |
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} |
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return; |
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memerr: |
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perror(progname); |
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exit(1); |
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readerr: |
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fprintf(stderr, "%s: read error on input\n", progname); |
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exit(1); |
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#undef S_SEARCH |
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#undef S_SOURCE |
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#undef S_DIREC |
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} |
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216 |
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print_values(funp) /* print out calculations */ |
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double (*funp)(); |
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{ |
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register struct glare_dir *gd; |
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for (gd = all_dirs; gd != NULL; gd = gd->next) |
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printf("%f\t%f\n", gd->ang*(180.0/PI), (*funp)(gd)); |
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} |
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double |
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greg |
1.9 |
direct(gd) /* compute direct vertical illuminance */ |
229 |
greg |
1.1 |
struct glare_dir *gd; |
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{ |
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FVECT mydir; |
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double d, dval; |
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register struct glare_src *gs; |
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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dval = 0.0; |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
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d = DOT(mydir,gs->dir); |
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if (d > FTINY) |
240 |
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dval += d * gs->dom * gs->lum; |
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} |
242 |
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return(dval); |
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greg |
1.9 |
} |
244 |
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245 |
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double |
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indirect(gd) /* return indirect vertical illuminance */ |
248 |
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struct glare_dir *gd; |
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{ |
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return(gd->indirect); |
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} |
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double |
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total(gd) /* return total vertical illuminance */ |
256 |
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struct glare_dir *gd; |
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{ |
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return(direct(gd)+gd->indirect); |
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greg |
1.1 |
} |
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/* |
263 |
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* posindex - compute glare position index from: |
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* |
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* Source Direction |
266 |
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* View Direction |
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* View Up Direction |
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* |
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* All vectors are assumed to be normalized. |
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* This function is an implementation of the method proposed by |
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* Robert Levin in his 1975 JIES article. |
272 |
greg |
1.5 |
* This calculation presumes the view direction and up vectors perpendicular. |
273 |
greg |
1.1 |
* We return a value less than zero for improper positions. |
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*/ |
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double |
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posindex(sd, vd, vu) /* compute position index */ |
278 |
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FVECT sd, vd, vu; |
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{ |
280 |
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double sigma, tau; |
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double d; |
282 |
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283 |
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d = DOT(sd,vd); |
284 |
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if (d <= 0.0) |
285 |
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return(-1.0); |
286 |
greg |
1.5 |
if (d >= 1.0) |
287 |
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return(1.0); |
288 |
greg |
1.1 |
sigma = acos(d) * (180./PI); |
289 |
greg |
1.5 |
d = DOT(sd,vu)/sqrt(1.0-d*d); |
290 |
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if (d >= 1.0) |
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tau = 0.0; |
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else |
293 |
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tau = acos(d) * (180./PI); |
294 |
greg |
1.1 |
return( exp( sigma*( (35.2 - tau*.31889 - 1.22*exp(-.22222*tau))*1e-3 |
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+ sigma*(21. + tau*(.26667 + tau*-.002963))*1e-5 ) |
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) ); |
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} |
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double |
301 |
greg |
1.2 |
guth_dgr(gd) /* compute Guth discomfort glare rating */ |
302 |
greg |
1.1 |
struct glare_dir *gd; |
303 |
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{ |
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#define q(w) (20.4*w+1.52*pow(w,.2)-.075) |
305 |
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register struct glare_src *gs; |
306 |
greg |
1.7 |
FVECT mydir; |
307 |
greg |
1.1 |
double p; |
308 |
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double sum; |
309 |
greg |
1.3 |
double wtot, brsum; |
310 |
greg |
1.1 |
int n; |
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|
312 |
greg |
1.7 |
spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
313 |
greg |
1.3 |
sum = wtot = brsum = 0.0; n = 0; |
314 |
greg |
1.1 |
for (gs = all_srcs; gs != NULL; gs = gs->next) { |
315 |
greg |
1.7 |
p = posindex(gs->dir, mydir, midview.vup); |
316 |
greg |
1.1 |
if (p <= FTINY) |
317 |
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continue; |
318 |
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sum += gs->lum * q(gs->dom) / p; |
319 |
greg |
1.3 |
brsum += gs->lum * gs->dom; |
320 |
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wtot += gs->dom; |
321 |
greg |
1.1 |
n++; |
322 |
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} |
323 |
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if (n == 0) |
324 |
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return(0.0); |
325 |
greg |
1.8 |
|
326 |
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return( pow(.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
327 |
greg |
1.1 |
pow((double)n, -.0914) ) ); |
328 |
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#undef q |
329 |
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} |
330 |
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331 |
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332 |
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extern double erf(), erfc(); |
333 |
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334 |
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#ifndef M_SQRT2 |
335 |
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#define M_SQRT2 1.41421356237309504880 |
336 |
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#endif |
337 |
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338 |
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#define norm_integral(z) (1.-.5*erfc((z)/M_SQRT2)) |
339 |
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340 |
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341 |
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double |
342 |
greg |
1.2 |
guth_vcp(gd) /* compute Guth visual comfort probability */ |
343 |
greg |
1.1 |
struct glare_dir *gd; |
344 |
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{ |
345 |
greg |
1.7 |
double dgr; |
346 |
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347 |
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dgr = guth_dgr(gd); |
348 |
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if (dgr <= FTINY) |
349 |
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return(100.0); |
350 |
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return(100.*norm_integral(6.374-1.3227*log(dgr))); |
351 |
greg |
1.8 |
} |
352 |
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353 |
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354 |
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double |
355 |
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cie_cgi(gd) /* compute CIE Glare Index */ |
356 |
|
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struct glare_dir *gd; |
357 |
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{ |
358 |
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register struct glare_src *gs; |
359 |
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FVECT mydir; |
360 |
|
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double dillum; |
361 |
|
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double p; |
362 |
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double sum; |
363 |
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364 |
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
365 |
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sum = 0.0; |
366 |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
367 |
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p = posindex(gs->dir, mydir, midview.vup); |
368 |
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if (p <= FTINY) |
369 |
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continue; |
370 |
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sum += gs->lum*gs->lum * gs->dom / (p*p); |
371 |
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} |
372 |
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if (sum <= FTINY) |
373 |
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return(0.0); |
374 |
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dillum = direct(gd); |
375 |
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return(8.*log10(2.*sum*(1.+dillum/500.)/(dillum+gd->indirect))); |
376 |
greg |
1.1 |
} |