292 |
|
main(int argc, char *argv[]) |
293 |
|
{ |
294 |
|
char buf[256]; |
295 |
+ |
double rotation = 0; /* site rotation (degrees) */ |
296 |
|
double elevation; /* site elevation (meters) */ |
297 |
|
int dir_is_horiz; /* direct is meas. on horizontal? */ |
298 |
|
float *mtx_data = NULL; /* our matrix data */ |
345 |
|
if (skycolor[1] <= 1e-4) |
346 |
|
skycolor[0] = skycolor[1] = skycolor[2] = 1; |
347 |
|
break; |
348 |
+ |
case 'r': /* rotate distribution */ |
349 |
+ |
if (argv[i][2] && argv[i][2] != 'z') |
350 |
+ |
goto userr; |
351 |
+ |
rotation = atof(argv[++i]); |
352 |
+ |
break; |
353 |
|
default: |
354 |
|
goto userr; |
355 |
|
} |
404 |
|
progname, s_latitude, s_longitude); |
405 |
|
fprintf(stderr, "%s: %d sky patches per time step\n", |
406 |
|
progname, nskypatch); |
407 |
+ |
if (rotation != 0) |
408 |
+ |
fprintf(stderr, "%s: rotating output %.0f degrees\n", |
409 |
+ |
progname, rotation); |
410 |
|
} |
411 |
|
/* convert quantities to radians */ |
412 |
|
s_latitude = DegToRad(s_latitude); |
430 |
|
sda = sdec(julian_date); |
431 |
|
sta = stadj(julian_date); |
432 |
|
altitude = salt(sda, hr+sta); |
433 |
< |
azimuth = sazi(sda, hr+sta) + PI; |
433 |
> |
azimuth = sazi(sda, hr+sta) + PI - DegToRad(rotation); |
434 |
|
/* convert measured values */ |
435 |
|
if (dir_is_horiz && altitude > 0.) |
436 |
|
dir /= sin(altitude); |
503 |
|
fprintf(stderr, "%s: done.\n", progname); |
504 |
|
exit(0); |
505 |
|
userr: |
506 |
< |
fprintf(stderr, "Usage: %s [-v][-d|-s][-m N][-g refl][-c r g b][-o{f|d}] [tape.wea]\n", |
506 |
> |
fprintf(stderr, "Usage: %s [-v][-d|-s][-r deg][-m N][-g r g b][-c r g b][-o{f|d}] [tape.wea]\n", |
507 |
|
progname); |
508 |
|
exit(1); |
509 |
|
fmterr: |
524 |
|
{ |
525 |
|
int index; /* Category index */ |
526 |
|
double norm_diff_illum; /* Normalized diffuse illuimnance */ |
518 |
– |
double zlumin; /* Zenith luminance */ |
527 |
|
int i; |
528 |
|
|
529 |
|
/* Calculate atmospheric precipitable water content */ |
530 |
|
apwc = CalcPrecipWater(dew_point); |
531 |
|
|
532 |
< |
/* Limit solar altitude to keep circumsolar off zenith */ |
533 |
< |
if (altitude > DegToRad(87.0)) |
534 |
< |
altitude = DegToRad(87.0); |
532 |
> |
/* Calculate sun zenith angle (don't let it dip below horizon) */ |
533 |
> |
/* Also limit minimum angle to keep circumsolar off zenith */ |
534 |
> |
if (altitude <= 0.0) |
535 |
> |
sun_zenith = DegToRad(90.0); |
536 |
> |
else if (altitude >= DegToRad(87.0)) |
537 |
> |
sun_zenith = DegToRad(3.0); |
538 |
> |
else |
539 |
> |
sun_zenith = DegToRad(90.0) - altitude; |
540 |
|
|
528 |
– |
/* Calculate sun zenith angle */ |
529 |
– |
sun_zenith = DegToRad(90.0) - altitude; |
530 |
– |
|
541 |
|
/* Compute the inputs for the calculation of the sky distribution */ |
542 |
|
|
543 |
|
if (input == 0) /* XXX never used */ |
556 |
|
sky_brightness = CalcSkyBrightness(); |
557 |
|
sky_clearness = CalcSkyClearness(); |
558 |
|
|
559 |
+ |
/* Limit sky clearness */ |
560 |
+ |
if (sky_clearness > 11.9) |
561 |
+ |
sky_clearness = 11.9; |
562 |
+ |
|
563 |
+ |
/* Limit sky brightness */ |
564 |
+ |
if (sky_brightness < 0.01) |
565 |
+ |
sky_brightness = 0.01; |
566 |
+ |
|
567 |
|
/* Calculate illuminance */ |
568 |
|
index = GetCategoryIndex(); |
569 |
|
diff_illum = diff_irrad * CalcDiffuseIllumRatio(index); |
598 |
|
/* Normalization coefficient */ |
599 |
|
norm_diff_illum = diff_illum / norm_diff_illum; |
600 |
|
|
583 |
– |
/* Calculate relative zenith luminance */ |
584 |
– |
zlumin = CalcRelLuminance(sun_zenith, 0.0); |
585 |
– |
|
586 |
– |
/* Calculate absolute zenith illuminance */ |
587 |
– |
zlumin *= norm_diff_illum; |
588 |
– |
|
601 |
|
/* Apply to sky patches to get absolute radiance values */ |
602 |
|
for (i = 1; i < nskypatch; i++) { |
603 |
< |
scalecolor(parr+3*i, zlumin*(1./WHTEFFICACY)); |
603 |
> |
scalecolor(parr+3*i, norm_diff_illum*(1./WHTEFFICACY)); |
604 |
|
multcolor(parr+3*i, skycolor); |
605 |
|
} |
606 |
|
} |
845 |
|
sky_clearness = 12.0; |
846 |
|
|
847 |
|
/* Limit sky brightness */ |
848 |
< |
if (sky_brightness < 0.05) |
848 |
> |
if (sky_brightness < 0.01) |
849 |
|
sky_brightness = 0.01; |
850 |
|
|
851 |
|
while (((fabs(diff_irrad - test1) > 10.0) || |
869 |
|
sky_clearness = 12.0; |
870 |
|
|
871 |
|
/* Limit sky brightness */ |
872 |
< |
if (sky_brightness < 0.05) |
872 |
> |
if (sky_brightness < 0.01) |
873 |
|
sky_brightness = 0.01; |
874 |
|
} |
875 |
|
|
955 |
|
double rh_illum = 0.0; /* Relative horizontal illuminance */ |
956 |
|
|
957 |
|
for (i = 1; i < nskypatch; i++) |
958 |
< |
rh_illum += parr[3*i+1] * rh_cos(i); |
958 |
> |
rh_illum += parr[3*i+1] * rh_cos(i) * rh_dom[i]; |
959 |
|
|
960 |
< |
return rh_illum * (2.0 * PI / (nskypatch-1)); |
960 |
> |
return rh_illum; |
961 |
|
} |
962 |
|
|
963 |
|
/* Calculate earth orbit eccentricity correction factor */ |