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/* 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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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Compute Glare Index given by program name or -t option: |
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* |
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* dgi - Daylight Glare Index |
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* brs_gi - Building Research Station Glare Index (Petherbridge |
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* & Hopkinson) |
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* ugr - Unified Glare Rating System (Fischer) |
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* guth_dgr - Guth discomfort glare rating |
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* guth_vcp - Guth visual comfort probability |
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* cie_cgi - CIE Glare Index (1983, due to Einhorn) |
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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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#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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double direct(), guth_dgr(), guth_vcp(), cie_cgi(), |
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indirect(), total(); |
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indirect(), total(), dgi(), brs_gi(), ugr(); |
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struct named_func { |
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char *name; |
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double (*func)(); |
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char *descrip; |
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} all_funcs[] = { |
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{"dgi", dgi, "Daylight Glare Index"}, |
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{"brs_gi", brs_gi, "BRS Glare Index"}, |
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{"ugr", ugr, "Unified Glare Rating"}, |
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{"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_ind", indirect, "Indirect Vertical Illuminance"}, |
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{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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int wrongformat = 0; |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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fprintf(stderr, "\t%12s\t%s\n", funp->name, funp->descrip); |
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exit(1); |
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} |
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int |
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headline(s) /* get line from header */ |
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char *s; |
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{ |
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char fmt[32]; |
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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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if (isview(s)) |
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sscanview(&midview, s); |
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else if (isformat(s)) { |
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formatval(fmt, s); |
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wrongformat = strcmp(fmt, "ascii"); |
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} |
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return(0); |
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} |
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init() /* initialize calculation */ |
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{ |
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/* read header */ |
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exit(1); |
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} |
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} |
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read_input() /* read glare sources from stdin */ |
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{ |
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#define S_SEARCH 0 |
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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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#undef S_SOURCE |
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#undef S_DIREC |
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} |
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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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direct(gd) /* compute direct vertical illuminance */ |
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struct glare_dir *gd; |
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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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} |
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return(dval); |
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} |
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double |
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indirect(gd) /* return indirect vertical illuminance */ |
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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 */ |
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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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} |
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/* |
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* posindex - compute glare position index from: |
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* This calculation presumes the view direction and up vectors perpendicular. |
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* 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 */ |
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FVECT sd, vd, vu; |
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{ |
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double sigma, tau; |
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double d; |
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d = DOT(sd,vd); |
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if (d <= 0.0) |
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return(-1.0); |
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if (d >= 1.0) |
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return(1.0); |
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sigma = acos(d) * (180./PI); |
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d = DOT(sd,vu)/sqrt(1.0-d*d); |
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d = fabs(DOT(sd,vu)/sqrt(1.0-d*d)); |
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if (d >= 1.0) |
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tau = 0.0; |
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else |
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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 |
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dgi(gd) /* compute Daylight Glare Index */ |
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struct glare_dir *gd; |
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{ |
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register struct glare_src *gs; |
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FVECT mydir,testdir[7],vhor; |
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double r,omega,p[7],sum; |
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int i,n; |
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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sum = 0.0; n = 0; |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
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/* compute 1/p^2 weighted solid angle of the source */ |
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r = sqrt(1 - pow(1.-gs->dom/2./PI,2.)); |
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fcross(vhor,gs->dir,midview.vup); |
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normalize(vhor); |
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VCOPY(testdir[0],gs->dir); |
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fvsum(testdir[1],gs->dir,vhor,r); |
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fvsum(testdir[2],gs->dir,vhor,0.5*r); |
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fvsum(testdir[5],testdir[2],midview.vup,-0.866*r); |
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fvsum(testdir[2],testdir[2],midview.vup,0.866*r); |
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fvsum(testdir[3],gs->dir,vhor,-r); |
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fvsum(testdir[4],gs->dir,vhor,-0.5*r); |
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fvsum(testdir[6],testdir[4],midview.vup,0.866*r); |
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fvsum(testdir[4],testdir[4],midview.vup,-0.866*r); |
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for (i = 0; i < 7; i++) { |
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normalize(testdir[i]); |
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p[i] = pow(posindex(testdir[i],mydir,midview.vup),-2.0); |
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if (p[i] <= FTINY) p[i] = 0.0; |
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} |
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r = 1-gs->dom/2./PI; |
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omega = gs->dom*p[0]; |
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omega += (r*PI*(1+1/r/r)-2*PI)*(-p[0]+(p[1]+p[2])*0.5); |
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omega += (2*PI-r*PI*(1+1/r/r))*(-p[0]-0.1667*(p[1]+p[3]) |
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+0.3334*(p[2]+p[4]+p[5]+p[6])); |
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sum += pow(gs->lum,1.6) * pow(omega,0.8) / |
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(gd->indirect/PI + 0.07*sqrt(gs->dom)*gs->lum); |
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n++; |
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} |
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if (n == 0) |
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return(0.0); |
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return( 10*log10(0.478*sum) ); |
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} |
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double |
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brs_gi(gd) /* compute BRS Glare Index */ |
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struct glare_dir *gd; |
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{ |
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register struct glare_src *gs; |
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FVECT mydir; |
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double p; |
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double sum; |
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|
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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sum = 0.0; |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
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p = posindex(gs->dir, mydir, midview.vup); |
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if (p <= FTINY) |
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continue; |
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sum += pow(gs->lum/p,1.6) * pow(gs->dom,0.8); |
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} |
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if (sum <= FTINY) |
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return(0.0); |
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sum /= gd->indirect/PI; |
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return(10*log10(0.478*sum)); |
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} |
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|
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double |
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guth_dgr(gd) /* compute Guth discomfort glare rating */ |
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struct glare_dir *gd; |
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{ |
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double sum; |
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double wtot, brsum; |
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int n; |
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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sum = wtot = brsum = 0.0; n = 0; |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
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} |
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if (n == 0) |
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return(0.0); |
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return( pow(.5*sum/pow((brsum+(5.-wtot)*gd->indirect/PI)/5.,.44), |
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pow((double)n, -.0914) ) ); |
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#undef q |
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} |
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extern double erf(), erfc(); |
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#ifndef M_SQRT2 |
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#define M_SQRT2 1.41421356237309504880 |
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#endif |
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#define norm_integral(z) (1.-.5*erfc((z)/M_SQRT2)) |
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double |
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guth_vcp(gd) /* compute Guth visual comfort probability */ |
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struct glare_dir *gd; |
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{ |
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extern double erfc(); |
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double dgr; |
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dgr = guth_dgr(gd); |
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if (dgr <= FTINY) |
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return(100.0); |
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return(100.*norm_integral(6.374-1.3227*log(dgr))); |
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} |
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double |
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cie_cgi(gd) /* compute CIE Glare Index */ |
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struct glare_dir *gd; |
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double dillum; |
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double p; |
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double sum; |
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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sum = 0.0; |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
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return(0.0); |
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dillum = direct(gd); |
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return(8.*log10(2.*sum*(1.+dillum/500.)/(dillum+gd->indirect))); |
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} |
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|
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|
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double |
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ugr(gd) /* compute Unified Glare Rating */ |
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struct glare_dir *gd; |
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{ |
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register struct glare_src *gs; |
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FVECT mydir; |
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double p; |
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double sum; |
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|
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spinvector(mydir, midview.vdir, midview.vup, gd->ang); |
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sum = 0.0; |
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for (gs = all_srcs; gs != NULL; gs = gs->next) { |
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p = posindex(gs->dir, mydir, midview.vup); |
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if (p <= FTINY) |
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continue; |
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sum += gs->lum*gs->lum * gs->dom / (p*p); |
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} |
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if (sum <= FTINY) |
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return(0.0); |
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return(8.*log10(0.25*sum*PI/gd->indirect)); |
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} |