| 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 */ |
| 590 |
|
/* Normalization coefficient */ |
| 591 |
|
norm_diff_illum = diff_illum / norm_diff_illum; |
| 592 |
|
|
| 583 |
– |
/* Calculate relative zenith luminance */ |
| 584 |
– |
zlumin = CalcRelLuminance(sun_zenith, 0.0); |
| 585 |
– |
|
| 586 |
– |
/* Calculate absolute zenith illuminance */ |
| 587 |
– |
zlumin *= norm_diff_illum; |
| 588 |
– |
|
| 593 |
|
/* Apply to sky patches to get absolute radiance values */ |
| 594 |
|
for (i = 1; i < nskypatch; i++) { |
| 595 |
< |
scalecolor(parr+3*i, zlumin*(1./WHTEFFICACY)); |
| 595 |
> |
scalecolor(parr+3*i, norm_diff_illum*(1./WHTEFFICACY)); |
| 596 |
|
multcolor(parr+3*i, skycolor); |
| 597 |
|
} |
| 598 |
|
} |
| 947 |
|
double rh_illum = 0.0; /* Relative horizontal illuminance */ |
| 948 |
|
|
| 949 |
|
for (i = 1; i < nskypatch; i++) |
| 950 |
< |
rh_illum += parr[3*i+1] * rh_cos(i); |
| 950 |
> |
rh_illum += parr[3*i+1] * rh_cos(i) * rh_dom[i]; |
| 951 |
|
|
| 952 |
< |
return rh_illum * (2.0 * PI / (nskypatch-1)); |
| 952 |
> |
return rh_illum; |
| 953 |
|
} |
| 954 |
|
|
| 955 |
|
/* Calculate earth orbit eccentricity correction factor */ |
