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#include "color.h" |
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#ifndef atof |
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extern double atof(); |
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#endif |
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extern char *strcpy(), *strcat(), *malloc(); |
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extern double stadj(), sdec(), sazi(), salt(); |
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extern double s_longitude; |
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extern double s_meridian; |
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/* required values */ |
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int month, day; |
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double hour; |
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int month, day; /* date */ |
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double hour; /* time */ |
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int tsolar; /* 0=standard, 1=solar */ |
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double altitude, azimuth; /* or solar angles */ |
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/* default values */ |
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int cloudy = 0; |
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int cloudy = 0; /* 1=standard, 2=uniform */ |
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int dosun = 1; |
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double zenithbr = -1.0; |
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double turbidity = 2.75; |
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int argc; |
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char *argv[]; |
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{ |
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extern double atof(), fabs(); |
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int i; |
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progname = argv[0]; |
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} |
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if (argc < 4) |
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userror("arg count"); |
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< |
month = atoi(argv[1]); |
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day = atoi(argv[2]); |
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hour = atof(argv[3]); |
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if (!strcmp(argv[1], "-ang")) { |
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altitude = atof(argv[2]) * (PI/180); |
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azimuth = atof(argv[3]) * (PI/180); |
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month = 0; |
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} else { |
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month = atoi(argv[1]); |
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if (month < 1 || month > 12) |
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userror("bad month"); |
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day = atoi(argv[2]); |
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if (day < 1 || day > 31) |
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userror("bad day"); |
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hour = atof(argv[3]); |
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if (hour < 0 || hour >= 24) |
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userror("bad hour"); |
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tsolar = argv[3][0] == '+'; |
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} |
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for (i = 4; i < argc; i++) |
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if (argv[i][0] == '-' || argv[i][0] == '+') |
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switch (argv[i][1]) { |
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dosun = argv[i][0] == '+'; |
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break; |
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case 'c': |
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< |
cloudy = 1; |
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> |
cloudy = argv[i][0] == '+' ? 2 : 1; |
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dosun = 0; |
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break; |
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case 't': |
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computesky() /* compute sky parameters */ |
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{ |
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int jd; |
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double sd, st; |
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double altitude, azimuth; |
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/* compute solar direction */ |
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< |
jd = jdate(month, day); /* Julian date */ |
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< |
sd = sdec(jd); /* solar declination */ |
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< |
st = hour + stadj(jd); /* solar time */ |
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< |
altitude = salt(sd, st); |
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< |
azimuth = sazi(sd, st); |
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> |
if (month) { /* from date and time */ |
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> |
int jd; |
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> |
double sd, st; |
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> |
|
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> |
jd = jdate(month, day); /* Julian date */ |
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> |
sd = sdec(jd); /* solar declination */ |
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> |
if (tsolar) /* solar time */ |
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> |
st = hour; |
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> |
else |
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> |
st = hour + stadj(jd); |
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> |
altitude = salt(sd, st); |
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> |
azimuth = sazi(sd, st); |
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> |
} |
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sundir[0] = -sin(azimuth)*cos(altitude); |
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sundir[1] = -cos(azimuth)*cos(altitude); |
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sundir[2] = sin(altitude); |
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if (zenithbr <= 0.0) |
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if (cloudy) { |
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zenithbr = 8.6*sundir[2] + .123; |
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< |
zenithbr *= 1000.0/SKYEFFICACY; |
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> |
zenithbr *= 1000.0/WHTEFFICACY; |
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} else { |
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zenithbr = (1.376*turbidity-1.81)*tan(altitude)+0.38; |
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zenithbr *= 1000.0/SKYEFFICACY; |
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zenithbr = 0.0; |
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/* Compute horizontal radiance */ |
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if (cloudy) { |
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< |
groundbr = zenithbr*0.777778; |
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> |
if (cloudy == 2) |
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> |
groundbr = zenithbr; |
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> |
else |
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> |
groundbr = zenithbr*0.777778; |
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printf("# Ground ambient level: %f\n", groundbr); |
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} else { |
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F2 = 0.274*(0.91 + 10.0*exp(-3.0*(PI/2.0-altitude)) + |
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0.45*sundir[2]*sundir[2]); |
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< |
groundbr = zenithbr*normsc(PI/2.0-altitude)/F2/PI; |
| 176 |
> |
groundbr = zenithbr*normsc(altitude)/F2/PI; |
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printf("# Ground ambient level: %f\n", groundbr); |
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if (sundir[2] > 0.0) { |
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if (sundir[2] > .16) |
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printf("2 skybright skybright.cal\n"); |
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printf("0\n"); |
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if (cloudy) |
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< |
printf("3 1 %.2e %.2e\n", zenithbr, groundbr); |
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> |
printf("3 %d %.2e %.2e\n", cloudy, zenithbr, groundbr); |
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else |
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printf("7 -1 %.2e %.2e %.2e %f %f %f\n", zenithbr, groundbr, |
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F2, sundir[0], sundir[1], sundir[2]); |
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|
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printdefaults() /* print default values */ |
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{ |
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< |
if (cloudy) |
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> |
if (cloudy == 1) |
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printf("-c\t\t\t\t# Cloudy sky\n"); |
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+ |
else if (cloudy == 2) |
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+ |
printf("+c\t\t\t\t# Uniform cloudy sky\n"); |
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else if (dosun) |
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printf("+s\t\t\t\t# Sunny sky with sun\n"); |
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else |
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if (msg != NULL) |
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fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
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fprintf(stderr, "Usage: %s month day hour [options]\n", progname); |
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+ |
fprintf(stderr, " Or: %s -ang altitude azimuth [options]\n", progname); |
| 242 |
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fprintf(stderr, " Or: %s -defaults\n", progname); |
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exit(1); |
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} |
