| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: findglare.c,v 2.17 2023/01/15 16:38:10 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Find glare sources in a scene or image. |
| 6 |
* |
| 7 |
* Greg Ward March 1991 |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "glare.h" |
| 11 |
|
| 12 |
char *rtargv[64] = {"rtrace", "-h-", "-ov", "-fff", "-ld-", "-i-", "-I-"}; |
| 13 |
int rtargc = 7; |
| 14 |
|
| 15 |
VIEW ourview = STDVIEW; /* our view */ |
| 16 |
VIEW pictview = STDVIEW; /* picture view */ |
| 17 |
VIEW leftview, rightview; /* leftmost and rightmost views */ |
| 18 |
|
| 19 |
char *picture = NULL; /* picture file name */ |
| 20 |
char *octree = NULL; /* octree file name */ |
| 21 |
|
| 22 |
int verbose = 0; /* verbose reporting */ |
| 23 |
|
| 24 |
double threshold = 0.; /* glare threshold */ |
| 25 |
|
| 26 |
int sampdens = SAMPDENS; /* sample density */ |
| 27 |
ANGLE glarang[180] = {AEND}; /* glare calculation angles */ |
| 28 |
int nglarangs = 0; |
| 29 |
double maxtheta; /* maximum angle (in radians) */ |
| 30 |
int hsize; /* horizontal size */ |
| 31 |
|
| 32 |
struct illum *indirect; /* array of indirect illuminances */ |
| 33 |
|
| 34 |
long npixinvw; /* number of pixels in view */ |
| 35 |
long npixmiss; /* number of pixels missed */ |
| 36 |
|
| 37 |
static int angcmp(const void *ap1, const void *ap2); |
| 38 |
static void init(void); |
| 39 |
static void cleanup(void); |
| 40 |
static void printsources(void); |
| 41 |
static void printillum(void); |
| 42 |
|
| 43 |
|
| 44 |
|
| 45 |
int |
| 46 |
main( |
| 47 |
int argc, |
| 48 |
char *argv[] |
| 49 |
) |
| 50 |
{ |
| 51 |
int combine = 1; |
| 52 |
int gotview = 0; |
| 53 |
int rval, i; |
| 54 |
char *err; |
| 55 |
/* set global progname */ |
| 56 |
fixargv0(argv[0]); |
| 57 |
/* process options */ |
| 58 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) { |
| 59 |
/* expand arguments */ |
| 60 |
while ((rval = expandarg(&argc, &argv, i)) > 0) |
| 61 |
; |
| 62 |
if (rval < 0) { |
| 63 |
fprintf(stderr, "%s: cannot expand '%s'\n", |
| 64 |
argv[0], argv[i]); |
| 65 |
exit(1); |
| 66 |
} |
| 67 |
rval = getviewopt(&ourview, argc-i, argv+i); |
| 68 |
if (rval >= 0) { |
| 69 |
i += rval; |
| 70 |
gotview++; |
| 71 |
continue; |
| 72 |
} |
| 73 |
switch (argv[i][1]) { |
| 74 |
case 't': |
| 75 |
threshold = atof(argv[++i]); |
| 76 |
break; |
| 77 |
case 'r': |
| 78 |
sampdens = atoi(argv[++i])/2; |
| 79 |
break; |
| 80 |
case 'v': |
| 81 |
if (argv[i][2] == '\0') { |
| 82 |
verbose++; |
| 83 |
break; |
| 84 |
} |
| 85 |
if (argv[i][2] != 'f') |
| 86 |
goto userr; |
| 87 |
rval = viewfile(argv[++i], &ourview, NULL); |
| 88 |
if (rval < 0) { |
| 89 |
fprintf(stderr, |
| 90 |
"%s: cannot open view file \"%s\"\n", |
| 91 |
progname, argv[i]); |
| 92 |
exit(1); |
| 93 |
} else if (rval == 0) { |
| 94 |
fprintf(stderr, |
| 95 |
"%s: bad view file \"%s\"\n", |
| 96 |
progname, argv[i]); |
| 97 |
exit(1); |
| 98 |
} else |
| 99 |
gotview++; |
| 100 |
break; |
| 101 |
case 'g': |
| 102 |
if (argv[i][2] != 'a') |
| 103 |
goto userr; |
| 104 |
if (setscan(glarang, argv[++i]) < 0) { |
| 105 |
fprintf(stderr, "%s: bad angle spec \"%s\"\n", |
| 106 |
progname, argv[i]); |
| 107 |
exit(1); |
| 108 |
} |
| 109 |
break; |
| 110 |
case 'p': |
| 111 |
picture = argv[++i]; |
| 112 |
break; |
| 113 |
case 'c': |
| 114 |
combine = !combine; |
| 115 |
break; |
| 116 |
case 'd': |
| 117 |
rtargv[rtargc++] = argv[i]; |
| 118 |
if (argv[i][2] != 'v') |
| 119 |
rtargv[rtargc++] = argv[++i]; |
| 120 |
break; |
| 121 |
case 'l': |
| 122 |
if (argv[i][2] == 'd') |
| 123 |
break; |
| 124 |
/* FALL THROUGH */ |
| 125 |
case 's': |
| 126 |
case 'P': |
| 127 |
case 'n': |
| 128 |
rtargv[rtargc++] = argv[i]; |
| 129 |
rtargv[rtargc++] = argv[++i]; |
| 130 |
break; |
| 131 |
case 'w': |
| 132 |
case 'u': |
| 133 |
case 'b': |
| 134 |
rtargv[rtargc++] = argv[i]; |
| 135 |
break; |
| 136 |
case 'a': |
| 137 |
rtargv[rtargc++] = argv[i]; |
| 138 |
if (argv[i][2] == 'v') { |
| 139 |
rtargv[rtargc++] = argv[++i]; |
| 140 |
rtargv[rtargc++] = argv[++i]; |
| 141 |
} |
| 142 |
rtargv[rtargc++] = argv[++i]; |
| 143 |
break; |
| 144 |
case 'm': |
| 145 |
rtargv[rtargc++] = argv[i]; |
| 146 |
if ((argv[i][2] == 'e') | (argv[i][2] == 'a')) { |
| 147 |
rtargv[rtargc++] = argv[++i]; |
| 148 |
rtargv[rtargc++] = argv[++i]; |
| 149 |
} |
| 150 |
rtargv[rtargc++] = argv[++i]; |
| 151 |
break; |
| 152 |
default: |
| 153 |
goto userr; |
| 154 |
} |
| 155 |
} |
| 156 |
/* get octree */ |
| 157 |
if (i < argc-1) |
| 158 |
goto userr; |
| 159 |
if (i == argc-1) { |
| 160 |
rtargv[rtargc++] = octree = argv[i]; |
| 161 |
rtargv[rtargc] = NULL; |
| 162 |
} |
| 163 |
/* get view */ |
| 164 |
if (picture != NULL) { |
| 165 |
rval = viewfile(picture, &pictview, NULL); |
| 166 |
if (rval < 0) { |
| 167 |
fprintf(stderr, "%s: cannot open picture file \"%s\"\n", |
| 168 |
progname, picture); |
| 169 |
exit(1); |
| 170 |
} else if (rval == 0) { |
| 171 |
fprintf(stderr, |
| 172 |
"%s: cannot get view from picture \"%s\"\n", |
| 173 |
progname, picture); |
| 174 |
exit(1); |
| 175 |
} |
| 176 |
if (pictview.type == VT_PAR) { |
| 177 |
fprintf(stderr, "%s: %s: cannot use parallel view\n", |
| 178 |
progname, picture); |
| 179 |
exit(1); |
| 180 |
} |
| 181 |
if ((err = setview(&pictview)) != NULL) { |
| 182 |
fprintf(stderr, "%s: %s\n", picture, err); |
| 183 |
exit(1); |
| 184 |
} |
| 185 |
} |
| 186 |
if (!gotview) { |
| 187 |
if (picture == NULL) { |
| 188 |
fprintf(stderr, "%s: must have view or picture\n", |
| 189 |
progname); |
| 190 |
exit(1); |
| 191 |
} |
| 192 |
ourview = pictview; |
| 193 |
} else if (picture != NULL && !VABSEQ(ourview.vp, pictview.vp)) { |
| 194 |
fprintf(stderr, "%s: picture must have same viewpoint\n", |
| 195 |
progname); |
| 196 |
exit(1); |
| 197 |
} |
| 198 |
ourview.type = VT_HEM; |
| 199 |
ourview.horiz = ourview.vert = 180.0; |
| 200 |
ourview.hoff = ourview.voff = 0.0; |
| 201 |
fvsum(ourview.vdir, ourview.vdir, ourview.vup, |
| 202 |
-DOT(ourview.vdir,ourview.vup)); |
| 203 |
if ((err = setview(&ourview)) != NULL) { |
| 204 |
fprintf(stderr, "%s: %s\n", progname, err); |
| 205 |
exit(1); |
| 206 |
} |
| 207 |
if (octree == NULL && picture == NULL) { |
| 208 |
fprintf(stderr, |
| 209 |
"%s: must specify at least one of picture or octree\n", |
| 210 |
progname); |
| 211 |
exit(1); |
| 212 |
} |
| 213 |
init(); /* initialize program */ |
| 214 |
if (threshold <= FTINY) |
| 215 |
comp_thresh(); /* compute glare threshold */ |
| 216 |
analyze(); /* analyze view */ |
| 217 |
if (combine) |
| 218 |
absorb_specks(); /* eliminate tiny sources */ |
| 219 |
cleanup(); /* tidy up */ |
| 220 |
/* print header */ |
| 221 |
newheader("RADIANCE", stdout); |
| 222 |
printargs(argc, argv, stdout); |
| 223 |
fputs(VIEWSTR, stdout); |
| 224 |
fprintview(&ourview, stdout); |
| 225 |
printf("\n"); |
| 226 |
fputformat("ascii", stdout); |
| 227 |
printf("\n"); |
| 228 |
printsources(); /* print glare sources */ |
| 229 |
printillum(); /* print illuminances */ |
| 230 |
exit(0); |
| 231 |
userr: |
| 232 |
fprintf(stderr, |
| 233 |
"Usage: %s [view options][-ga angles][-p picture][[rtrace options] octree]\n", |
| 234 |
progname); |
| 235 |
exit(1); |
| 236 |
} |
| 237 |
|
| 238 |
|
| 239 |
static int |
| 240 |
angcmp( /* compare two angles */ |
| 241 |
const void *ap1, |
| 242 |
const void *ap2 |
| 243 |
) |
| 244 |
{ |
| 245 |
int a1, a2; |
| 246 |
|
| 247 |
a1 = *(ANGLE *)ap1; |
| 248 |
a2 = *(ANGLE *)ap2; |
| 249 |
if (a1 == a2) { |
| 250 |
fprintf(stderr, "%s: duplicate glare angle (%d)\n", |
| 251 |
progname, a1); |
| 252 |
exit(1); |
| 253 |
} |
| 254 |
return(a1-a2); |
| 255 |
} |
| 256 |
|
| 257 |
|
| 258 |
static void |
| 259 |
init(void) /* initialize global variables */ |
| 260 |
{ |
| 261 |
double d; |
| 262 |
int i; |
| 263 |
|
| 264 |
if (verbose) |
| 265 |
fprintf(stderr, "%s: initializing data structures...\n", |
| 266 |
progname); |
| 267 |
/* set direction vectors */ |
| 268 |
for (i = 0; glarang[i] != AEND; i++) |
| 269 |
; |
| 270 |
qsort(glarang, i, sizeof(ANGLE), angcmp); |
| 271 |
if (i > 0 && (glarang[0] <= 0 || glarang[i-1] > 180)) { |
| 272 |
fprintf(stderr, "%s: glare angles must be between 1 and 180\n", |
| 273 |
progname); |
| 274 |
exit(1); |
| 275 |
} |
| 276 |
nglarangs = i; |
| 277 |
/* nglardirs = 2*nglarangs + 1; */ |
| 278 |
/* vsize = sampdens - 1; */ |
| 279 |
if (nglarangs > 0) |
| 280 |
maxtheta = (PI/180.)*glarang[nglarangs-1]; |
| 281 |
else |
| 282 |
maxtheta = 0.0; |
| 283 |
hsize = hlim(0) + sampdens - 1; |
| 284 |
if (hsize > (int)(PI*sampdens)) |
| 285 |
hsize = PI*sampdens; |
| 286 |
indirect = (struct illum *)calloc(nglardirs, sizeof(struct illum)); |
| 287 |
if (indirect == NULL) |
| 288 |
memerr("indirect illuminances"); |
| 289 |
npixinvw = npixmiss = 0L; |
| 290 |
leftview = ourview; |
| 291 |
rightview = ourview; |
| 292 |
spinvector(leftview.vdir, ourview.vdir, ourview.vup, maxtheta); |
| 293 |
spinvector(rightview.vdir, ourview.vdir, ourview.vup, -maxtheta); |
| 294 |
setview(&leftview); |
| 295 |
setview(&rightview); |
| 296 |
indirect[nglarangs].lcos = |
| 297 |
indirect[nglarangs].rcos = cos(maxtheta); |
| 298 |
indirect[nglarangs].rsin = |
| 299 |
-(indirect[nglarangs].lsin = sin(maxtheta)); |
| 300 |
indirect[nglarangs].theta = 0.0; |
| 301 |
for (i = 0; i < nglarangs; i++) { |
| 302 |
d = (glarang[nglarangs-1] - glarang[i])*(PI/180.); |
| 303 |
indirect[nglarangs-i-1].lcos = |
| 304 |
indirect[nglarangs+i+1].rcos = cos(d); |
| 305 |
indirect[nglarangs+i+1].rsin = |
| 306 |
-(indirect[nglarangs-i-1].lsin = sin(d)); |
| 307 |
d = (glarang[nglarangs-1] + glarang[i])*(PI/180.); |
| 308 |
indirect[nglarangs-i-1].rcos = |
| 309 |
indirect[nglarangs+i+1].lcos = cos(d); |
| 310 |
indirect[nglarangs-i-1].rsin = |
| 311 |
-(indirect[nglarangs+i+1].lsin = sin(d)); |
| 312 |
indirect[nglarangs-i-1].theta = (PI/180.)*glarang[i]; |
| 313 |
indirect[nglarangs+i+1].theta = -(PI/180.)*glarang[i]; |
| 314 |
} |
| 315 |
/* open picture */ |
| 316 |
if (picture != NULL) { |
| 317 |
if (verbose) |
| 318 |
fprintf(stderr, "%s: opening picture file \"%s\"...\n", |
| 319 |
progname, picture); |
| 320 |
open_pict(picture); |
| 321 |
} |
| 322 |
/* start rtrace */ |
| 323 |
if (octree != NULL) { |
| 324 |
if (verbose) { |
| 325 |
fprintf(stderr, |
| 326 |
"%s: starting luminance calculation...\n\t", |
| 327 |
progname); |
| 328 |
printargs(rtargc, rtargv, stderr); |
| 329 |
} |
| 330 |
fork_rtrace(rtargv); |
| 331 |
} |
| 332 |
} |
| 333 |
|
| 334 |
|
| 335 |
static void |
| 336 |
cleanup(void) /* close files, wait for children */ |
| 337 |
{ |
| 338 |
if (verbose) |
| 339 |
fprintf(stderr, "%s: cleaning up... \n", progname); |
| 340 |
if (picture != NULL) |
| 341 |
close_pict(); |
| 342 |
if (octree != NULL) |
| 343 |
done_rtrace(); |
| 344 |
if (npixinvw < 100*npixmiss) |
| 345 |
fprintf(stderr, "%s: warning -- missing %d%% of samples\n", |
| 346 |
progname, (int)(100L*npixmiss/npixinvw)); |
| 347 |
} |
| 348 |
|
| 349 |
|
| 350 |
int |
| 351 |
compdir( /* compute direction for x,y */ |
| 352 |
FVECT vd, |
| 353 |
int x, |
| 354 |
int y |
| 355 |
) |
| 356 |
{ |
| 357 |
int hl; |
| 358 |
FVECT org; /* dummy variable */ |
| 359 |
|
| 360 |
hl = hlim(y); |
| 361 |
if (x <= -hl) { /* left region */ |
| 362 |
if (x <= -hl-sampdens) |
| 363 |
return(-1); |
| 364 |
return(viewray(org, vd, &leftview, |
| 365 |
(double)(x+hl)/(2*sampdens)+.5, |
| 366 |
(double)y/(2*sampdens)+.5)); |
| 367 |
} |
| 368 |
if (x >= hl) { /* right region */ |
| 369 |
if (x >= hl+sampdens) |
| 370 |
return(-1); |
| 371 |
return(viewray(org, vd, &rightview, |
| 372 |
(double)(x-hl)/(2*sampdens)+.5, |
| 373 |
(double)y/(2*sampdens)+.5)); |
| 374 |
} |
| 375 |
/* central region */ |
| 376 |
if (viewray(org, vd, &ourview, .5, (double)y/(2*sampdens)+.5) < 0) |
| 377 |
return(-1); |
| 378 |
spinvector(vd, vd, ourview.vup, h_theta(x,y)); |
| 379 |
return(0); |
| 380 |
} |
| 381 |
|
| 382 |
|
| 383 |
double |
| 384 |
pixsize( /* return the solid angle of pixel at (x,y) */ |
| 385 |
int x, |
| 386 |
int y |
| 387 |
) |
| 388 |
{ |
| 389 |
int hl, xo; |
| 390 |
double disc; |
| 391 |
|
| 392 |
hl = hlim(y); |
| 393 |
if (x < -hl) |
| 394 |
xo = x+hl; |
| 395 |
else if (x > hl) |
| 396 |
xo = x-hl; |
| 397 |
else |
| 398 |
xo = 0; |
| 399 |
disc = 1. - (double)((long)xo*xo + (long)y*y)/((long)sampdens*sampdens); |
| 400 |
if (disc <= FTINY*FTINY) |
| 401 |
return(0.); |
| 402 |
return(1./(sampdens*sampdens*sqrt(disc))); |
| 403 |
} |
| 404 |
|
| 405 |
|
| 406 |
void |
| 407 |
memerr( /* malloc failure */ |
| 408 |
char *s |
| 409 |
) |
| 410 |
{ |
| 411 |
fprintf(stderr, "%s: out of memory for %s\n", progname, s); |
| 412 |
exit(1); |
| 413 |
} |
| 414 |
|
| 415 |
|
| 416 |
static void |
| 417 |
printsources(void) /* print out glare sources */ |
| 418 |
{ |
| 419 |
struct source *sp; |
| 420 |
|
| 421 |
printf("BEGIN glare source\n"); |
| 422 |
for (sp = donelist; sp != NULL; sp = sp->next) |
| 423 |
printf("\t%f %f %f\t%e\t%e\n", |
| 424 |
sp->dir[0], sp->dir[1], sp->dir[2], |
| 425 |
sp->dom, sp->brt); |
| 426 |
printf("END glare source\n"); |
| 427 |
} |
| 428 |
|
| 429 |
|
| 430 |
static void |
| 431 |
printillum(void) /* print out indirect illuminances */ |
| 432 |
{ |
| 433 |
int i; |
| 434 |
|
| 435 |
printf("BEGIN indirect illuminance\n"); |
| 436 |
for (i = 0; i < nglardirs; i++) |
| 437 |
if (indirect[i].n > FTINY) |
| 438 |
printf("\t%.0f\t%f\n", (180.0/PI)*indirect[i].theta, |
| 439 |
PI * indirect[i].sum / indirect[i].n); |
| 440 |
printf("END indirect illuminance\n"); |
| 441 |
} |
