| 247 |
|
}; |
| 248 |
|
|
| 249 |
|
#ifndef NSUNPATCH |
| 250 |
< |
#define NSUNPATCH 4 /* # patches to spread sun into */ |
| 250 |
> |
#define NSUNPATCH 4 /* max. # patches to spread sun into */ |
| 251 |
|
#endif |
| 252 |
|
|
| 253 |
|
extern int jdate(int month, int day); |
| 260 |
|
extern double s_longitude; |
| 261 |
|
extern double s_meridian; |
| 262 |
|
|
| 263 |
+ |
int nsuns = NSUNPATCH; /* number of sun patches to use */ |
| 264 |
+ |
double fixed_sun_sa = -1; /* fixed solid angle per sun? */ |
| 265 |
+ |
|
| 266 |
|
int verbose = 0; /* progress reports to stderr? */ |
| 267 |
|
|
| 268 |
|
int outfmt = 'a'; /* output format */ |
| 295 |
|
main(int argc, char *argv[]) |
| 296 |
|
{ |
| 297 |
|
char buf[256]; |
| 298 |
+ |
double rotation = 0; /* site rotation (degrees) */ |
| 299 |
|
double elevation; /* site elevation (meters) */ |
| 300 |
|
int dir_is_horiz; /* direct is meas. on horizontal? */ |
| 301 |
|
float *mtx_data = NULL; /* our matrix data */ |
| 348 |
|
if (skycolor[1] <= 1e-4) |
| 349 |
|
skycolor[0] = skycolor[1] = skycolor[2] = 1; |
| 350 |
|
break; |
| 351 |
+ |
case 'r': /* rotate distribution */ |
| 352 |
+ |
if (argv[i][2] && argv[i][2] != 'z') |
| 353 |
+ |
goto userr; |
| 354 |
+ |
rotation = atof(argv[++i]); |
| 355 |
+ |
break; |
| 356 |
+ |
case '5': /* 5-phase calculation */ |
| 357 |
+ |
nsuns = 1; |
| 358 |
+ |
fixed_sun_sa = 6.797e-05; |
| 359 |
+ |
break; |
| 360 |
|
default: |
| 361 |
|
goto userr; |
| 362 |
|
} |
| 411 |
|
progname, s_latitude, s_longitude); |
| 412 |
|
fprintf(stderr, "%s: %d sky patches per time step\n", |
| 413 |
|
progname, nskypatch); |
| 414 |
+ |
if (rotation != 0) |
| 415 |
+ |
fprintf(stderr, "%s: rotating output %.0f degrees\n", |
| 416 |
+ |
progname, rotation); |
| 417 |
|
} |
| 418 |
|
/* convert quantities to radians */ |
| 419 |
|
s_latitude = DegToRad(s_latitude); |
| 437 |
|
sda = sdec(julian_date); |
| 438 |
|
sta = stadj(julian_date); |
| 439 |
|
altitude = salt(sda, hr+sta); |
| 440 |
< |
azimuth = sazi(sda, hr+sta) + PI; |
| 440 |
> |
azimuth = sazi(sda, hr+sta) + PI - DegToRad(rotation); |
| 441 |
|
/* convert measured values */ |
| 442 |
|
if (dir_is_horiz && altitude > 0.) |
| 443 |
|
dir /= sin(altitude); |
| 510 |
|
fprintf(stderr, "%s: done.\n", progname); |
| 511 |
|
exit(0); |
| 512 |
|
userr: |
| 513 |
< |
fprintf(stderr, "Usage: %s [-v][-d|-s][-m N][-g refl][-c r g b][-o{f|d}] [tape.wea]\n", |
| 513 |
> |
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", |
| 514 |
|
progname); |
| 515 |
|
exit(1); |
| 516 |
|
fmterr: |
| 531 |
|
{ |
| 532 |
|
int index; /* Category index */ |
| 533 |
|
double norm_diff_illum; /* Normalized diffuse illuimnance */ |
| 518 |
– |
double zlumin; /* Zenith luminance */ |
| 534 |
|
int i; |
| 535 |
|
|
| 536 |
|
/* Calculate atmospheric precipitable water content */ |
| 537 |
|
apwc = CalcPrecipWater(dew_point); |
| 538 |
|
|
| 539 |
< |
/* Limit solar altitude to keep circumsolar off zenith */ |
| 540 |
< |
if (altitude > DegToRad(87.0)) |
| 541 |
< |
altitude = DegToRad(87.0); |
| 539 |
> |
/* Calculate sun zenith angle (don't let it dip below horizon) */ |
| 540 |
> |
/* Also limit minimum angle to keep circumsolar off zenith */ |
| 541 |
> |
if (altitude <= 0.0) |
| 542 |
> |
sun_zenith = DegToRad(90.0); |
| 543 |
> |
else if (altitude >= DegToRad(87.0)) |
| 544 |
> |
sun_zenith = DegToRad(3.0); |
| 545 |
> |
else |
| 546 |
> |
sun_zenith = DegToRad(90.0) - altitude; |
| 547 |
|
|
| 528 |
– |
/* Calculate sun zenith angle */ |
| 529 |
– |
sun_zenith = DegToRad(90.0) - altitude; |
| 530 |
– |
|
| 548 |
|
/* Compute the inputs for the calculation of the sky distribution */ |
| 549 |
|
|
| 550 |
|
if (input == 0) /* XXX never used */ |
| 563 |
|
sky_brightness = CalcSkyBrightness(); |
| 564 |
|
sky_clearness = CalcSkyClearness(); |
| 565 |
|
|
| 566 |
+ |
/* Limit sky clearness */ |
| 567 |
+ |
if (sky_clearness > 11.9) |
| 568 |
+ |
sky_clearness = 11.9; |
| 569 |
+ |
|
| 570 |
+ |
/* Limit sky brightness */ |
| 571 |
+ |
if (sky_brightness < 0.01) |
| 572 |
+ |
sky_brightness = 0.01; |
| 573 |
+ |
|
| 574 |
|
/* Calculate illuminance */ |
| 575 |
|
index = GetCategoryIndex(); |
| 576 |
|
diff_illum = diff_irrad * CalcDiffuseIllumRatio(index); |
| 605 |
|
/* Normalization coefficient */ |
| 606 |
|
norm_diff_illum = diff_illum / norm_diff_illum; |
| 607 |
|
|
| 583 |
– |
/* Calculate relative zenith luminance */ |
| 584 |
– |
zlumin = CalcRelLuminance(sun_zenith, 0.0); |
| 585 |
– |
|
| 586 |
– |
/* Calculate absolute zenith illuminance */ |
| 587 |
– |
zlumin *= norm_diff_illum; |
| 588 |
– |
|
| 608 |
|
/* Apply to sky patches to get absolute radiance values */ |
| 609 |
|
for (i = 1; i < nskypatch; i++) { |
| 610 |
< |
scalecolor(parr+3*i, zlumin*(1./WHTEFFICACY)); |
| 610 |
> |
scalecolor(parr+3*i, norm_diff_illum*(1./WHTEFFICACY)); |
| 611 |
|
multcolor(parr+3*i, skycolor); |
| 612 |
|
} |
| 613 |
|
} |
| 624 |
|
|
| 625 |
|
if (dir_illum <= 1e-4 || bright(suncolor) <= 1e-4) |
| 626 |
|
return; |
| 627 |
< |
/* identify NSUNPATCH closest patches */ |
| 628 |
< |
for (i = NSUNPATCH; i--; ) |
| 627 |
> |
/* identify nsuns closest patches */ |
| 628 |
> |
if (nsuns > NSUNPATCH) |
| 629 |
> |
nsuns = NSUNPATCH; |
| 630 |
> |
else if (nsuns <= 0) |
| 631 |
> |
nsuns = 1; |
| 632 |
> |
for (i = nsuns; i--; ) |
| 633 |
|
near_dprod[i] = -1.; |
| 634 |
|
vector(svec, altitude, azimuth); |
| 635 |
|
for (p = 1; p < nskypatch; p++) { |
| 637 |
|
double dprod; |
| 638 |
|
rh_vector(pvec, p); |
| 639 |
|
dprod = DOT(pvec, svec); |
| 640 |
< |
for (i = 0; i < NSUNPATCH; i++) |
| 640 |
> |
for (i = 0; i < nsuns; i++) |
| 641 |
|
if (dprod > near_dprod[i]) { |
| 642 |
< |
for (j = NSUNPATCH; --j > i; ) { |
| 642 |
> |
for (j = nsuns; --j > i; ) { |
| 643 |
|
near_dprod[j] = near_dprod[j-1]; |
| 644 |
|
near_patch[j] = near_patch[j-1]; |
| 645 |
|
} |
| 649 |
|
} |
| 650 |
|
} |
| 651 |
|
wtot = 0; /* weight by proximity */ |
| 652 |
< |
for (i = NSUNPATCH; i--; ) |
| 652 |
> |
for (i = nsuns; i--; ) |
| 653 |
|
wtot += wta[i] = 1./(1.002 - near_dprod[i]); |
| 654 |
|
/* add to nearest patch radiances */ |
| 655 |
< |
for (i = NSUNPATCH; i--; ) { |
| 655 |
> |
for (i = nsuns; i--; ) { |
| 656 |
|
float *pdest = parr + 3*near_patch[i]; |
| 657 |
< |
float val_add = wta[i] * dir_illum / |
| 658 |
< |
(WHTEFFICACY * wtot * rh_dom[near_patch[i]]); |
| 657 |
> |
float val_add = wta[i] * dir_illum / (WHTEFFICACY * wtot); |
| 658 |
> |
|
| 659 |
> |
val_add /= (fixed_sun_sa > 0) ? fixed_sun_sa |
| 660 |
> |
: rh_dom[near_patch[i]] ; |
| 661 |
|
*pdest++ += val_add*suncolor[0]; |
| 662 |
|
*pdest++ += val_add*suncolor[1]; |
| 663 |
|
*pdest++ += val_add*suncolor[2]; |
| 858 |
|
sky_clearness = 12.0; |
| 859 |
|
|
| 860 |
|
/* Limit sky brightness */ |
| 861 |
< |
if (sky_brightness < 0.05) |
| 861 |
> |
if (sky_brightness < 0.01) |
| 862 |
|
sky_brightness = 0.01; |
| 863 |
|
|
| 864 |
|
while (((fabs(diff_irrad - test1) > 10.0) || |
| 882 |
|
sky_clearness = 12.0; |
| 883 |
|
|
| 884 |
|
/* Limit sky brightness */ |
| 885 |
< |
if (sky_brightness < 0.05) |
| 885 |
> |
if (sky_brightness < 0.01) |
| 886 |
|
sky_brightness = 0.01; |
| 887 |
|
} |
| 888 |
|
|
| 968 |
|
double rh_illum = 0.0; /* Relative horizontal illuminance */ |
| 969 |
|
|
| 970 |
|
for (i = 1; i < nskypatch; i++) |
| 971 |
< |
rh_illum += parr[3*i+1] * rh_cos(i); |
| 971 |
> |
rh_illum += parr[3*i+1] * rh_cos(i) * rh_dom[i]; |
| 972 |
|
|
| 973 |
< |
return rh_illum * (2.0 * PI / (nskypatch-1)); |
| 973 |
> |
return rh_illum; |
| 974 |
|
} |
| 975 |
|
|
| 976 |
|
/* Calculate earth orbit eccentricity correction factor */ |
