1 |
– |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* gensky.c - program to generate sky functions. |
6 |
|
* Our zenith is along the Z-axis, the X-axis |
11 |
|
*/ |
12 |
|
|
13 |
|
#include <stdio.h> |
14 |
< |
|
14 |
> |
#include <stdlib.h> |
15 |
> |
#include <string.h> |
16 |
|
#include <math.h> |
17 |
+ |
#include <ctype.h> |
18 |
|
|
19 |
|
#include "color.h" |
20 |
|
|
21 |
< |
#ifndef atof |
22 |
< |
extern double atof(); |
21 |
> |
extern int jdate(int month, int day); |
22 |
> |
extern double stadj(int jd); |
23 |
> |
extern double sdec(int jd); |
24 |
> |
extern double salt(double sd, double st); |
25 |
> |
extern double sazi(double sd, double st); |
26 |
> |
|
27 |
> |
#ifndef PI |
28 |
> |
#define PI 3.14159265358979323846 |
29 |
|
#endif |
25 |
– |
extern char *strcpy(), *strcat(), *malloc(); |
26 |
– |
extern double stadj(), sdec(), sazi(), salt(); |
30 |
|
|
28 |
– |
#define PI 3.141592654 |
29 |
– |
|
31 |
|
#define DOT(v1,v2) (v1[0]*v2[0]+v1[1]*v2[1]+v1[2]*v2[2]) |
32 |
|
|
33 |
+ |
#define S_CLEAR 1 |
34 |
+ |
#define S_OVER 2 |
35 |
+ |
#define S_UNIF 3 |
36 |
+ |
#define S_INTER 4 |
37 |
+ |
|
38 |
+ |
#define overcast ((skytype==S_OVER)|(skytype==S_UNIF)) |
39 |
+ |
|
40 |
|
double normsc(); |
41 |
|
/* sun calculation constants */ |
42 |
|
extern double s_latitude; |
43 |
|
extern double s_longitude; |
44 |
|
extern double s_meridian; |
45 |
+ |
|
46 |
+ |
#undef toupper |
47 |
+ |
#define toupper(c) ((c) & ~0x20) /* ASCII trick to convert case */ |
48 |
+ |
|
49 |
+ |
/* European and North American zones */ |
50 |
+ |
struct { |
51 |
+ |
char zname[8]; /* time zone name (all caps) */ |
52 |
+ |
float zmer; /* standard meridian */ |
53 |
+ |
} tzone[] = { |
54 |
+ |
{"YST", 135}, {"YDT", 120}, |
55 |
+ |
{"PST", 120}, {"PDT", 105}, |
56 |
+ |
{"MST", 105}, {"MDT", 90}, |
57 |
+ |
{"CST", 90}, {"CDT", 75}, |
58 |
+ |
{"EST", 75}, {"EDT", 60}, |
59 |
+ |
{"AST", 60}, {"ADT", 45}, |
60 |
+ |
{"NST", 52.5}, {"NDT", 37.5}, |
61 |
+ |
{"GMT", 0}, {"BST", -15}, |
62 |
+ |
{"CET", -15}, {"CEST", -30}, |
63 |
+ |
{"EET", -30}, {"EEST", -45}, |
64 |
+ |
{"AST", -45}, {"ADT", -60}, |
65 |
+ |
{"GST", -60}, {"GDT", -75}, |
66 |
+ |
{"IST", -82.5}, {"IDT", -97.5}, |
67 |
+ |
{"JST", -135}, {"NDT", -150}, |
68 |
+ |
{"NZST", -180}, {"NZDT", -195}, |
69 |
+ |
{"", 0} |
70 |
+ |
}; |
71 |
|
/* required values */ |
72 |
|
int month, day; /* date */ |
73 |
|
double hour; /* time */ |
74 |
|
int tsolar; /* 0=standard, 1=solar */ |
75 |
|
double altitude, azimuth; /* or solar angles */ |
76 |
|
/* default values */ |
77 |
< |
int cloudy = 0; /* 1=standard, 2=uniform */ |
77 |
> |
int skytype = S_CLEAR; /* sky type */ |
78 |
|
int dosun = 1; |
79 |
< |
double zenithbr = -1.0; |
79 |
> |
double zenithbr = 0.0; |
80 |
> |
int u_zenith = 0; /* -1=irradiance, 1=radiance */ |
81 |
|
double turbidity = 2.75; |
82 |
|
double gprefl = 0.2; |
83 |
|
/* computed values */ |
84 |
|
double sundir[3]; |
85 |
|
double groundbr; |
86 |
|
double F2; |
87 |
< |
double solarbr; |
87 |
> |
double solarbr = 0.0; |
88 |
> |
int u_solar = 0; /* -1=irradiance, 1=radiance */ |
89 |
|
|
90 |
|
char *progname; |
91 |
|
char errmsg[128]; |
92 |
|
|
93 |
+ |
void computesky(void); |
94 |
+ |
void printsky(void); |
95 |
+ |
void printdefaults(void); |
96 |
+ |
void userror(char *msg); |
97 |
+ |
double normsc(void); |
98 |
+ |
void cvthour(char *hs); |
99 |
+ |
void printhead(register int ac, register char **av); |
100 |
|
|
101 |
+ |
|
102 |
+ |
int |
103 |
|
main(argc, argv) |
104 |
|
int argc; |
105 |
|
char *argv[]; |
106 |
|
{ |
62 |
– |
extern double fabs(); |
107 |
|
int i; |
108 |
|
|
109 |
|
progname = argv[0]; |
124 |
|
day = atoi(argv[2]); |
125 |
|
if (day < 1 || day > 31) |
126 |
|
userror("bad day"); |
127 |
< |
hour = atof(argv[3]); |
84 |
< |
if (hour < 0 || hour >= 24) |
85 |
< |
userror("bad hour"); |
86 |
< |
tsolar = argv[3][0] == '+'; |
127 |
> |
cvthour(argv[3]); |
128 |
|
} |
129 |
|
for (i = 4; i < argc; i++) |
130 |
|
if (argv[i][0] == '-' || argv[i][0] == '+') |
131 |
|
switch (argv[i][1]) { |
132 |
|
case 's': |
133 |
< |
cloudy = 0; |
133 |
> |
skytype = S_CLEAR; |
134 |
|
dosun = argv[i][0] == '+'; |
135 |
|
break; |
136 |
+ |
case 'r': |
137 |
+ |
case 'R': |
138 |
+ |
u_solar = argv[i][1]=='R' ? -1 : 1; |
139 |
+ |
solarbr = atof(argv[++i]); |
140 |
+ |
break; |
141 |
|
case 'c': |
142 |
< |
cloudy = argv[i][0] == '+' ? 2 : 1; |
97 |
< |
dosun = 0; |
142 |
> |
skytype = S_OVER; |
143 |
|
break; |
144 |
+ |
case 'u': |
145 |
+ |
skytype = S_UNIF; |
146 |
+ |
break; |
147 |
+ |
case 'i': |
148 |
+ |
skytype = S_INTER; |
149 |
+ |
dosun = argv[i][0] == '+'; |
150 |
+ |
break; |
151 |
|
case 't': |
152 |
|
turbidity = atof(argv[++i]); |
153 |
|
break; |
154 |
|
case 'b': |
155 |
+ |
case 'B': |
156 |
+ |
u_zenith = argv[i][1]=='B' ? -1 : 1; |
157 |
|
zenithbr = atof(argv[++i]); |
158 |
|
break; |
159 |
|
case 'g': |
175 |
|
else |
176 |
|
userror("bad option"); |
177 |
|
|
178 |
< |
if (fabs(s_meridian-s_longitude) > 30*PI/180) |
178 |
> |
if (fabs(s_meridian-s_longitude) > 45*PI/180) |
179 |
|
fprintf(stderr, |
180 |
|
"%s: warning: %.1f hours btwn. standard meridian and longitude\n", |
181 |
|
progname, (s_longitude-s_meridian)*12/PI); |
184 |
|
|
185 |
|
computesky(); |
186 |
|
printsky(); |
187 |
+ |
|
188 |
+ |
exit(0); |
189 |
|
} |
190 |
|
|
191 |
|
|
192 |
< |
computesky() /* compute sky parameters */ |
192 |
> |
void |
193 |
> |
computesky(void) /* compute sky parameters */ |
194 |
|
{ |
195 |
+ |
double normfactor; |
196 |
|
/* compute solar direction */ |
197 |
|
if (month) { /* from date and time */ |
198 |
|
int jd; |
206 |
|
st = hour + stadj(jd); |
207 |
|
altitude = salt(sd, st); |
208 |
|
azimuth = sazi(sd, st); |
209 |
+ |
printf("# Local solar time: %.2f\n", st); |
210 |
+ |
printf("# Solar altitude and azimuth: %.1f %.1f\n", |
211 |
+ |
180./PI*altitude, 180./PI*azimuth); |
212 |
|
} |
213 |
+ |
if (!overcast && altitude > 87.*PI/180.) { |
214 |
+ |
fprintf(stderr, |
215 |
+ |
"%s: warning - sun too close to zenith, reducing altitude to 87 degrees\n", |
216 |
+ |
progname); |
217 |
+ |
printf( |
218 |
+ |
"# warning - sun too close to zenith, reducing altitude to 87 degrees\n"); |
219 |
+ |
altitude = 87.*PI/180.; |
220 |
+ |
} |
221 |
|
sundir[0] = -sin(azimuth)*cos(altitude); |
222 |
|
sundir[1] = -cos(azimuth)*cos(altitude); |
223 |
|
sundir[2] = sin(altitude); |
224 |
|
|
225 |
+ |
/* Compute normalization factor */ |
226 |
+ |
switch (skytype) { |
227 |
+ |
case S_UNIF: |
228 |
+ |
normfactor = 1.0; |
229 |
+ |
break; |
230 |
+ |
case S_OVER: |
231 |
+ |
normfactor = 0.777778; |
232 |
+ |
break; |
233 |
+ |
case S_CLEAR: |
234 |
+ |
F2 = 0.274*(0.91 + 10.0*exp(-3.0*(PI/2.0-altitude)) + |
235 |
+ |
0.45*sundir[2]*sundir[2]); |
236 |
+ |
normfactor = normsc()/F2/PI; |
237 |
+ |
break; |
238 |
+ |
case S_INTER: |
239 |
+ |
F2 = (2.739 + .9891*sin(.3119+2.6*altitude)) * |
240 |
+ |
exp(-(PI/2.0-altitude)*(.4441+1.48*altitude)); |
241 |
+ |
normfactor = normsc()/F2/PI; |
242 |
+ |
break; |
243 |
+ |
} |
244 |
|
/* Compute zenith brightness */ |
245 |
< |
if (zenithbr <= 0.0) |
246 |
< |
if (cloudy) { |
245 |
> |
if (u_zenith == -1) |
246 |
> |
zenithbr /= normfactor*PI; |
247 |
> |
else if (u_zenith == 0) { |
248 |
> |
if (overcast) |
249 |
|
zenithbr = 8.6*sundir[2] + .123; |
250 |
< |
zenithbr *= 1000.0/WHTEFFICACY; |
161 |
< |
} else { |
250 |
> |
else |
251 |
|
zenithbr = (1.376*turbidity-1.81)*tan(altitude)+0.38; |
252 |
< |
zenithbr *= 1000.0/SKYEFFICACY; |
253 |
< |
} |
254 |
< |
if (zenithbr < 0.0) |
255 |
< |
zenithbr = 0.0; |
167 |
< |
/* Compute horizontal radiance */ |
168 |
< |
if (cloudy) { |
169 |
< |
if (cloudy == 2) |
170 |
< |
groundbr = zenithbr; |
252 |
> |
if (skytype == S_INTER) |
253 |
> |
zenithbr = (zenithbr + 8.6*sundir[2] + .123)/2.0; |
254 |
> |
if (zenithbr < 0.0) |
255 |
> |
zenithbr = 0.0; |
256 |
|
else |
257 |
< |
groundbr = zenithbr*0.777778; |
173 |
< |
printf("# Ground ambient level: %f\n", groundbr); |
174 |
< |
} else { |
175 |
< |
F2 = 0.274*(0.91 + 10.0*exp(-3.0*(PI/2.0-altitude)) + |
176 |
< |
0.45*sundir[2]*sundir[2]); |
177 |
< |
groundbr = zenithbr*normsc(altitude)/F2/PI; |
178 |
< |
printf("# Ground ambient level: %f\n", groundbr); |
179 |
< |
if (sundir[2] > 0.0) { |
180 |
< |
if (sundir[2] > .16) |
181 |
< |
solarbr = (1.5e9/SUNEFFICACY) * |
182 |
< |
(1.147 - .147/sundir[2]); |
183 |
< |
else |
184 |
< |
solarbr = 1.5e9/SUNEFFICACY*(1.147-.147/.16); |
185 |
< |
groundbr += solarbr*6e-5*sundir[2]/PI; |
186 |
< |
} else |
187 |
< |
dosun = 0; |
257 |
> |
zenithbr *= 1000.0/SKYEFFICACY; |
258 |
|
} |
259 |
+ |
/* Compute horizontal radiance */ |
260 |
+ |
groundbr = zenithbr*normfactor; |
261 |
+ |
printf("# Ground ambient level: %.1f\n", groundbr); |
262 |
+ |
if (!overcast && sundir[2] > 0.0 && (!u_solar || solarbr > 0.0)) { |
263 |
+ |
if (u_solar == -1) |
264 |
+ |
solarbr /= 6e-5*sundir[2]; |
265 |
+ |
else if (u_solar == 0) { |
266 |
+ |
solarbr = 1.5e9/SUNEFFICACY * |
267 |
+ |
(1.147 - .147/(sundir[2]>.16?sundir[2]:.16)); |
268 |
+ |
if (skytype == S_INTER) |
269 |
+ |
solarbr *= 0.15; /* fudge factor! */ |
270 |
+ |
} |
271 |
+ |
groundbr += 6e-5/PI*solarbr*sundir[2]; |
272 |
+ |
} else |
273 |
+ |
dosun = 0; |
274 |
|
groundbr *= gprefl; |
275 |
|
} |
276 |
|
|
277 |
|
|
278 |
< |
printsky() /* print out sky */ |
278 |
> |
void |
279 |
> |
printsky(void) /* print out sky */ |
280 |
|
{ |
281 |
|
if (dosun) { |
282 |
|
printf("\nvoid light solar\n"); |
288 |
|
} |
289 |
|
|
290 |
|
printf("\nvoid brightfunc skyfunc\n"); |
291 |
< |
printf("2 skybright skybright.cal\n"); |
291 |
> |
printf("2 skybr skybright.cal\n"); |
292 |
|
printf("0\n"); |
293 |
< |
if (cloudy) |
294 |
< |
printf("3 %d %.2e %.2e\n", cloudy, zenithbr, groundbr); |
293 |
> |
if (overcast) |
294 |
> |
printf("3 %d %.2e %.2e\n", skytype, zenithbr, groundbr); |
295 |
|
else |
296 |
< |
printf("7 -1 %.2e %.2e %.2e %f %f %f\n", zenithbr, groundbr, |
297 |
< |
F2, sundir[0], sundir[1], sundir[2]); |
296 |
> |
printf("7 %d %.2e %.2e %.2e %f %f %f\n", |
297 |
> |
skytype, zenithbr, groundbr, F2, |
298 |
> |
sundir[0], sundir[1], sundir[2]); |
299 |
|
} |
300 |
|
|
301 |
|
|
302 |
< |
printdefaults() /* print default values */ |
302 |
> |
void |
303 |
> |
printdefaults(void) /* print default values */ |
304 |
|
{ |
305 |
< |
if (cloudy == 1) |
305 |
> |
switch (skytype) { |
306 |
> |
case S_OVER: |
307 |
|
printf("-c\t\t\t\t# Cloudy sky\n"); |
308 |
< |
else if (cloudy == 2) |
309 |
< |
printf("+c\t\t\t\t# Uniform cloudy sky\n"); |
310 |
< |
else if (dosun) |
311 |
< |
printf("+s\t\t\t\t# Sunny sky with sun\n"); |
312 |
< |
else |
313 |
< |
printf("-s\t\t\t\t# Sunny sky without sun\n"); |
308 |
> |
break; |
309 |
> |
case S_UNIF: |
310 |
> |
printf("-u\t\t\t\t# Uniform cloudy sky\n"); |
311 |
> |
break; |
312 |
> |
case S_INTER: |
313 |
> |
if (dosun) |
314 |
> |
printf("+i\t\t\t\t# Intermediate sky with sun\n"); |
315 |
> |
else |
316 |
> |
printf("-i\t\t\t\t# Intermediate sky without sun\n"); |
317 |
> |
break; |
318 |
> |
case S_CLEAR: |
319 |
> |
if (dosun) |
320 |
> |
printf("+s\t\t\t\t# Sunny sky with sun\n"); |
321 |
> |
else |
322 |
> |
printf("-s\t\t\t\t# Sunny sky without sun\n"); |
323 |
> |
break; |
324 |
> |
} |
325 |
|
printf("-g %f\t\t\t# Ground plane reflectance\n", gprefl); |
326 |
|
if (zenithbr > 0.0) |
327 |
|
printf("-b %f\t\t\t# Zenith radiance (watts/ster/m2\n", zenithbr); |
333 |
|
} |
334 |
|
|
335 |
|
|
336 |
< |
userror(msg) /* print usage error and quit */ |
337 |
< |
char *msg; |
336 |
> |
void |
337 |
> |
userror( /* print usage error and quit */ |
338 |
> |
char *msg |
339 |
> |
) |
340 |
|
{ |
341 |
|
if (msg != NULL) |
342 |
|
fprintf(stderr, "%s: Use error - %s\n", progname, msg); |
348 |
|
|
349 |
|
|
350 |
|
double |
351 |
< |
normsc(theta) /* compute normalization factor (E0*F2/L0) */ |
250 |
< |
double theta; |
351 |
> |
normsc(void) /* compute normalization factor (E0*F2/L0) */ |
352 |
|
{ |
353 |
< |
static double nf[5] = {2.766521, 0.547665, |
354 |
< |
-0.369832, 0.009237, 0.059229}; |
353 |
> |
static double nfc[2][5] = { |
354 |
> |
/* clear sky approx. */ |
355 |
> |
{2.766521, 0.547665, -0.369832, 0.009237, 0.059229}, |
356 |
> |
/* intermediate sky approx. */ |
357 |
> |
{3.5556, -2.7152, -1.3081, 1.0660, 0.60227}, |
358 |
> |
}; |
359 |
> |
register double *nf; |
360 |
|
double x, nsc; |
361 |
|
register int i; |
362 |
|
/* polynomial approximation */ |
363 |
< |
x = (theta - PI/4.0)/(PI/4.0); |
364 |
< |
nsc = nf[4]; |
365 |
< |
for (i = 3; i >= 0; i--) |
363 |
> |
nf = nfc[skytype==S_INTER]; |
364 |
> |
x = (altitude - PI/4.0)/(PI/4.0); |
365 |
> |
nsc = nf[i=4]; |
366 |
> |
while (i--) |
367 |
|
nsc = nsc*x + nf[i]; |
368 |
|
|
369 |
|
return(nsc); |
370 |
|
} |
371 |
|
|
372 |
|
|
373 |
< |
printhead(ac, av) /* print command header */ |
374 |
< |
register int ac; |
375 |
< |
register char **av; |
373 |
> |
void |
374 |
> |
cvthour( /* convert hour string */ |
375 |
> |
char *hs |
376 |
> |
) |
377 |
> |
{ |
378 |
> |
register char *cp = hs; |
379 |
> |
register int i, j; |
380 |
> |
|
381 |
> |
if ( (tsolar = *cp == '+') ) cp++; /* solar time? */ |
382 |
> |
while (isdigit(*cp)) cp++; |
383 |
> |
if (*cp == ':') |
384 |
> |
hour = atoi(hs) + atoi(++cp)/60.0; |
385 |
> |
else { |
386 |
> |
hour = atof(hs); |
387 |
> |
if (*cp == '.') cp++; |
388 |
> |
} |
389 |
> |
while (isdigit(*cp)) cp++; |
390 |
> |
if (!*cp) |
391 |
> |
return; |
392 |
> |
if (tsolar || !isalpha(*cp)) { |
393 |
> |
fprintf(stderr, "%s: bad time format: %s\n", progname, hs); |
394 |
> |
exit(1); |
395 |
> |
} |
396 |
> |
i = 0; |
397 |
> |
do { |
398 |
> |
for (j = 0; cp[j]; j++) |
399 |
> |
if (toupper(cp[j]) != tzone[i].zname[j]) |
400 |
> |
break; |
401 |
> |
if (!cp[j] && !tzone[i].zname[j]) { |
402 |
> |
s_meridian = tzone[i].zmer * (PI/180); |
403 |
> |
return; |
404 |
> |
} |
405 |
> |
} while (tzone[i++].zname[0]); |
406 |
> |
|
407 |
> |
fprintf(stderr, "%s: unknown time zone: %s\n", progname, cp); |
408 |
> |
fprintf(stderr, "Known time zones:\n\t%s", tzone[0].zname); |
409 |
> |
for (i = 1; tzone[i].zname[0]; i++) |
410 |
> |
fprintf(stderr, " %s", tzone[i].zname); |
411 |
> |
putc('\n', stderr); |
412 |
> |
exit(1); |
413 |
> |
} |
414 |
> |
|
415 |
> |
|
416 |
> |
void |
417 |
> |
printhead( /* print command header */ |
418 |
> |
register int ac, |
419 |
> |
register char **av |
420 |
> |
) |
421 |
|
{ |
422 |
|
putchar('#'); |
423 |
|
while (ac--) { |