| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: rv3.c,v 2.26 2008/08/29 05:46:03 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* rv3.c - miscellaneous routines for rview. |
| 6 |
* |
| 7 |
* External symbols declared in rpaint.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include <string.h> |
| 13 |
|
| 14 |
#include "ray.h" |
| 15 |
#include "rpaint.h" |
| 16 |
#include "random.h" |
| 17 |
|
| 18 |
#ifndef WFLUSH |
| 19 |
#define WFLUSH 64 /* flush after this many rays */ |
| 20 |
#endif |
| 21 |
|
| 22 |
#ifdef SMLFLT |
| 23 |
#define sscanvec(s,v) (sscanf(s,"%f %f %f",v,v+1,v+2)==3) |
| 24 |
#else |
| 25 |
#define sscanvec(s,v) (sscanf(s,"%lf %lf %lf",v,v+1,v+2)==3) |
| 26 |
#endif |
| 27 |
|
| 28 |
static unsigned long niflush; /* flushes since newimage() */ |
| 29 |
|
| 30 |
int |
| 31 |
getrect( /* get a box */ |
| 32 |
char *s, |
| 33 |
RECT *r |
| 34 |
) |
| 35 |
{ |
| 36 |
int x0, y0, x1, y1; |
| 37 |
|
| 38 |
if (*s && !strncmp(s, "all", strlen(s))) { |
| 39 |
r->l = r->d = 0; |
| 40 |
r->r = hresolu; |
| 41 |
r->u = vresolu; |
| 42 |
return(0); |
| 43 |
} |
| 44 |
if (sscanf(s, "%d %d %d %d", &x0, &y0, &x1, &y1) != 4) { |
| 45 |
if (dev->getcur == NULL) |
| 46 |
return(-1); |
| 47 |
(*dev->comout)("Pick first corner\n"); |
| 48 |
if ((*dev->getcur)(&x0, &y0) == ABORT) |
| 49 |
return(-1); |
| 50 |
(*dev->comout)("Pick second corner\n"); |
| 51 |
if ((*dev->getcur)(&x1, &y1) == ABORT) |
| 52 |
return(-1); |
| 53 |
} |
| 54 |
if (x0 < x1) { |
| 55 |
r->l = x0; |
| 56 |
r->r = x1; |
| 57 |
} else { |
| 58 |
r->l = x1; |
| 59 |
r->r = x0; |
| 60 |
} |
| 61 |
if (y0 < y1) { |
| 62 |
r->d = y0; |
| 63 |
r->u = y1; |
| 64 |
} else { |
| 65 |
r->d = y1; |
| 66 |
r->u = y0; |
| 67 |
} |
| 68 |
if (r->l < 0) r->l = 0; |
| 69 |
if (r->d < 0) r->d = 0; |
| 70 |
if (r->r > hresolu) r->r = hresolu; |
| 71 |
if (r->u > vresolu) r->u = vresolu; |
| 72 |
if (r->l > r->r) r->l = r->r; |
| 73 |
if (r->d > r->u) r->d = r->u; |
| 74 |
return(0); |
| 75 |
} |
| 76 |
|
| 77 |
|
| 78 |
int |
| 79 |
getinterest( /* get area of interest */ |
| 80 |
char *s, |
| 81 |
int direc, |
| 82 |
FVECT vec, |
| 83 |
double *mp |
| 84 |
) |
| 85 |
{ |
| 86 |
int x, y; |
| 87 |
RAY thisray; |
| 88 |
int i; |
| 89 |
|
| 90 |
if (sscanf(s, "%lf", mp) != 1) |
| 91 |
*mp = 1.0; |
| 92 |
else if (*mp < -FTINY) /* negative zoom is reduction */ |
| 93 |
*mp = -1.0 / *mp; |
| 94 |
else if (*mp <= FTINY) { /* too small */ |
| 95 |
error(COMMAND, "illegal magnification"); |
| 96 |
return(-1); |
| 97 |
} |
| 98 |
if (!sscanvec(sskip(s), vec)) { |
| 99 |
if (dev->getcur == NULL) |
| 100 |
return(-1); |
| 101 |
(*dev->comout)("Pick view center\n"); |
| 102 |
if ((*dev->getcur)(&x, &y) == ABORT) |
| 103 |
return(-1); |
| 104 |
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, |
| 105 |
&ourview, (x+.5)/hresolu, (y+.5)/vresolu)) < -FTINY) { |
| 106 |
error(COMMAND, "not on image"); |
| 107 |
return(-1); |
| 108 |
} |
| 109 |
if (!direc || ourview.type == VT_PAR) { |
| 110 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
| 111 |
if (!localhit(&thisray, &thescene)) { |
| 112 |
error(COMMAND, "not a local object"); |
| 113 |
return(-1); |
| 114 |
} |
| 115 |
} |
| 116 |
if (direc) |
| 117 |
if (ourview.type == VT_PAR) |
| 118 |
for (i = 0; i < 3; i++) |
| 119 |
vec[i] = thisray.rop[i] - ourview.vp[i]; |
| 120 |
else |
| 121 |
VCOPY(vec, thisray.rdir); |
| 122 |
else |
| 123 |
VCOPY(vec, thisray.rop); |
| 124 |
} else if (direc) { |
| 125 |
for (i = 0; i < 3; i++) |
| 126 |
vec[i] -= ourview.vp[i]; |
| 127 |
if (normalize(vec) == 0.0) { |
| 128 |
error(COMMAND, "point at view origin"); |
| 129 |
return(-1); |
| 130 |
} |
| 131 |
} |
| 132 |
return(0); |
| 133 |
} |
| 134 |
|
| 135 |
|
| 136 |
float * /* keep consistent with COLOR typedef */ |
| 137 |
greyof( /* convert color to greyscale */ |
| 138 |
COLOR col |
| 139 |
) |
| 140 |
{ |
| 141 |
static COLOR gcol; |
| 142 |
double b; |
| 143 |
|
| 144 |
b = bright(col); |
| 145 |
setcolor(gcol, b, b, b); |
| 146 |
return(gcol); |
| 147 |
} |
| 148 |
|
| 149 |
static void |
| 150 |
recolor( /* recolor the given node */ |
| 151 |
PNODE *p |
| 152 |
) |
| 153 |
{ |
| 154 |
while (p->kid != NULL) { /* need to propogate down */ |
| 155 |
int mx = (p->xmin + p->xmax) >> 1; |
| 156 |
int my = (p->ymin + p->ymax) >> 1; |
| 157 |
int ki; |
| 158 |
if (p->x >= mx) |
| 159 |
ki = (p->y >= my) ? UR : DR; |
| 160 |
else |
| 161 |
ki = (p->y >= my) ? UL : DL; |
| 162 |
pcopy(p, p->kid+ki); |
| 163 |
p = p->kid + ki; |
| 164 |
} |
| 165 |
|
| 166 |
(*dev->paintr)(greyscale?greyof(p->v):p->v, |
| 167 |
p->xmin, p->ymin, p->xmax, p->ymax); |
| 168 |
} |
| 169 |
|
| 170 |
int |
| 171 |
paint( /* compute and paint a rectangle */ |
| 172 |
PNODE *p |
| 173 |
) |
| 174 |
{ |
| 175 |
extern int ray_pnprocs; |
| 176 |
static unsigned long lastflush = 0; |
| 177 |
static RAY thisray; |
| 178 |
int flushintvl; |
| 179 |
double h, v; |
| 180 |
|
| 181 |
if (p->xmax - p->xmin <= 0 || p->ymax - p->ymin <= 0) { /* empty */ |
| 182 |
p->x = p->xmin; |
| 183 |
p->y = p->ymin; |
| 184 |
setcolor(p->v, 0.0, 0.0, 0.0); |
| 185 |
return(0); |
| 186 |
} |
| 187 |
/* jitter ray direction */ |
| 188 |
p->x = h = p->xmin + (p->xmax-p->xmin)*frandom(); |
| 189 |
p->y = v = p->ymin + (p->ymax-p->ymin)*frandom(); |
| 190 |
|
| 191 |
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview, |
| 192 |
h/hresolu, v/vresolu)) < -FTINY) { |
| 193 |
setcolor(thisray.rcol, 0.0, 0.0, 0.0); |
| 194 |
} else { |
| 195 |
int rval; |
| 196 |
rayorigin(&thisray, PRIMARY, NULL, NULL); |
| 197 |
thisray.rno = (unsigned long)p; |
| 198 |
rval = ray_pqueue(&thisray); |
| 199 |
if (!rval) |
| 200 |
return(0); |
| 201 |
if (rval < 0) |
| 202 |
return(-1); |
| 203 |
p = (PNODE *)thisray.rno; |
| 204 |
} |
| 205 |
|
| 206 |
copycolor(p->v, thisray.rcol); |
| 207 |
scalecolor(p->v, exposure); |
| 208 |
|
| 209 |
recolor(p); /* paint it */ |
| 210 |
|
| 211 |
if (ambounce <= 0) /* shall we check for input? */ |
| 212 |
flushintvl = ray_pnprocs*WFLUSH; |
| 213 |
else if (niflush < WFLUSH) |
| 214 |
flushintvl = ray_pnprocs*niflush/(ambounce+1); |
| 215 |
else |
| 216 |
flushintvl = ray_pnprocs*WFLUSH/(ambounce+1); |
| 217 |
|
| 218 |
if (dev->flush != NULL && raynum - lastflush >= flushintvl) { |
| 219 |
lastflush = raynum; |
| 220 |
(*dev->flush)(); |
| 221 |
niflush++; |
| 222 |
} |
| 223 |
return(1); |
| 224 |
} |
| 225 |
|
| 226 |
|
| 227 |
int |
| 228 |
waitrays(void) /* finish up pending rays */ |
| 229 |
{ |
| 230 |
int nwaited = 0; |
| 231 |
int rval; |
| 232 |
RAY raydone; |
| 233 |
|
| 234 |
while ((rval = ray_presult(&raydone, 0)) > 0) { |
| 235 |
PNODE *p = (PNODE *)raydone.rno; |
| 236 |
copycolor(p->v, raydone.rcol); |
| 237 |
scalecolor(p->v, exposure); |
| 238 |
recolor(p); |
| 239 |
nwaited++; |
| 240 |
} |
| 241 |
if (rval < 0) |
| 242 |
return(-1); |
| 243 |
return(nwaited); |
| 244 |
} |
| 245 |
|
| 246 |
|
| 247 |
void |
| 248 |
newimage( /* start a new image */ |
| 249 |
char *s |
| 250 |
) |
| 251 |
{ |
| 252 |
int newnp; |
| 253 |
/* change in nproc? */ |
| 254 |
if (s != NULL && sscanf(s, "%d", &newnp) == 1 && newnp > 0) { |
| 255 |
if (!newparam) { |
| 256 |
if (newnp < nproc) |
| 257 |
ray_pclose(nproc - newnp); |
| 258 |
else |
| 259 |
ray_popen(newnp - nproc); |
| 260 |
} |
| 261 |
nproc = newnp; |
| 262 |
} |
| 263 |
/* free old image */ |
| 264 |
freepkids(&ptrunk); |
| 265 |
/* compute resolution */ |
| 266 |
hresolu = dev->xsiz; |
| 267 |
vresolu = dev->ysiz; |
| 268 |
normaspect(viewaspect(&ourview), &dev->pixaspect, &hresolu, &vresolu); |
| 269 |
ptrunk.xmin = ptrunk.ymin = pframe.l = pframe.d = 0; |
| 270 |
ptrunk.xmax = pframe.r = hresolu; |
| 271 |
ptrunk.ymax = pframe.u = vresolu; |
| 272 |
pdepth = 0; |
| 273 |
/* clear device */ |
| 274 |
(*dev->clear)(hresolu, vresolu); |
| 275 |
|
| 276 |
if (newparam) { /* (re)start rendering procs */ |
| 277 |
ray_pclose(0); |
| 278 |
ray_popen(nproc); |
| 279 |
newparam = 0; |
| 280 |
} |
| 281 |
niflush = 0; /* get first value */ |
| 282 |
paint(&ptrunk); |
| 283 |
} |
| 284 |
|
| 285 |
|
| 286 |
void |
| 287 |
redraw(void) /* redraw the image */ |
| 288 |
{ |
| 289 |
(*dev->clear)(hresolu, vresolu); |
| 290 |
(*dev->comout)("redrawing...\n"); |
| 291 |
repaint(0, 0, hresolu, vresolu); |
| 292 |
(*dev->comout)("\n"); |
| 293 |
} |
| 294 |
|
| 295 |
|
| 296 |
void |
| 297 |
repaint( /* repaint a region */ |
| 298 |
int xmin, |
| 299 |
int ymin, |
| 300 |
int xmax, |
| 301 |
int ymax |
| 302 |
) |
| 303 |
{ |
| 304 |
RECT reg; |
| 305 |
|
| 306 |
reg.l = xmin; reg.r = xmax; |
| 307 |
reg.d = ymin; reg.u = ymax; |
| 308 |
|
| 309 |
paintrect(&ptrunk, ®); |
| 310 |
} |
| 311 |
|
| 312 |
|
| 313 |
void |
| 314 |
paintrect( /* paint picture rectangle */ |
| 315 |
PNODE *p, |
| 316 |
RECT *r |
| 317 |
) |
| 318 |
{ |
| 319 |
int mx, my; |
| 320 |
|
| 321 |
if (p->xmax - p->xmin <= 0 || p->ymax - p->ymin <= 0) |
| 322 |
return; |
| 323 |
|
| 324 |
if (p->kid == NULL) { |
| 325 |
(*dev->paintr)(greyscale?greyof(p->v):p->v, |
| 326 |
p->xmin, p->ymin, p->xmax, p->ymax); /* do this */ |
| 327 |
return; |
| 328 |
} |
| 329 |
mx = (p->xmin + p->xmax) >> 1; /* do kids */ |
| 330 |
my = (p->ymin + p->ymax) >> 1; |
| 331 |
if (mx > r->l) { |
| 332 |
if (my > r->d) |
| 333 |
paintrect(p->kid+DL, r); |
| 334 |
if (my < r->u) |
| 335 |
paintrect(p->kid+UL, r); |
| 336 |
} |
| 337 |
if (mx < r->r) { |
| 338 |
if (my > r->d) |
| 339 |
paintrect(p->kid+DR, r); |
| 340 |
if (my < r->u) |
| 341 |
paintrect(p->kid+UR, r); |
| 342 |
} |
| 343 |
} |
| 344 |
|
| 345 |
|
| 346 |
PNODE * |
| 347 |
findrect( /* find a rectangle */ |
| 348 |
int x, |
| 349 |
int y, |
| 350 |
PNODE *p, |
| 351 |
int pd |
| 352 |
) |
| 353 |
{ |
| 354 |
int mx, my; |
| 355 |
|
| 356 |
while (p->kid != NULL && pd--) { |
| 357 |
|
| 358 |
mx = (p->xmin + p->xmax) >> 1; |
| 359 |
my = (p->ymin + p->ymax) >> 1; |
| 360 |
|
| 361 |
if (x < mx) { |
| 362 |
if (y < my) { |
| 363 |
p = p->kid+DL; |
| 364 |
} else { |
| 365 |
p = p->kid+UL; |
| 366 |
} |
| 367 |
} else { |
| 368 |
if (y < my) { |
| 369 |
p = p->kid+DR; |
| 370 |
} else { |
| 371 |
p = p->kid+UR; |
| 372 |
} |
| 373 |
} |
| 374 |
} |
| 375 |
return(p); |
| 376 |
} |
| 377 |
|
| 378 |
|
| 379 |
void |
| 380 |
compavg( /* recompute averages */ |
| 381 |
PNODE *p |
| 382 |
) |
| 383 |
{ |
| 384 |
if (p->kid == NULL) |
| 385 |
return; |
| 386 |
compavg(p->kid+DL); |
| 387 |
compavg(p->kid+DR); |
| 388 |
compavg(p->kid+UL); |
| 389 |
compavg(p->kid+UR); |
| 390 |
setcolor(p->v, .0, .0, .0); |
| 391 |
addcolor(p->v, p->kid[DL].v); |
| 392 |
addcolor(p->v, p->kid[DR].v); |
| 393 |
addcolor(p->v, p->kid[UL].v); |
| 394 |
addcolor(p->v, p->kid[UR].v); |
| 395 |
scalecolor(p->v, 0.25); |
| 396 |
} |
| 397 |
|
| 398 |
|
| 399 |
void |
| 400 |
scalepict( /* scale picture values */ |
| 401 |
PNODE *p, |
| 402 |
double sf |
| 403 |
) |
| 404 |
{ |
| 405 |
scalecolor(p->v, sf); /* do this node */ |
| 406 |
|
| 407 |
if (p->kid == NULL) |
| 408 |
return; |
| 409 |
/* do children */ |
| 410 |
scalepict(p->kid+DL, sf); |
| 411 |
scalepict(p->kid+DR, sf); |
| 412 |
scalepict(p->kid+UL, sf); |
| 413 |
scalepict(p->kid+UR, sf); |
| 414 |
} |
| 415 |
|
| 416 |
|
| 417 |
void |
| 418 |
getpictcolrs( /* get scanline from picture */ |
| 419 |
int yoff, |
| 420 |
COLR *scan, |
| 421 |
PNODE *p, |
| 422 |
int xsiz, |
| 423 |
int ysiz |
| 424 |
) |
| 425 |
{ |
| 426 |
int mx; |
| 427 |
int my; |
| 428 |
|
| 429 |
if (p->kid == NULL) { /* do this node */ |
| 430 |
setcolr(scan[0], colval(p->v,RED), |
| 431 |
colval(p->v,GRN), |
| 432 |
colval(p->v,BLU)); |
| 433 |
for (mx = 1; mx < xsiz; mx++) |
| 434 |
copycolr(scan[mx], scan[0]); |
| 435 |
return; |
| 436 |
} |
| 437 |
/* do kids */ |
| 438 |
mx = xsiz >> 1; |
| 439 |
my = ysiz >> 1; |
| 440 |
if (yoff < my) { |
| 441 |
getpictcolrs(yoff, scan, p->kid+DL, mx, my); |
| 442 |
getpictcolrs(yoff, scan+mx, p->kid+DR, xsiz-mx, my); |
| 443 |
} else { |
| 444 |
getpictcolrs(yoff-my, scan, p->kid+UL, mx, ysiz-my); |
| 445 |
getpictcolrs(yoff-my, scan+mx, p->kid+UR, xsiz-mx, ysiz-my); |
| 446 |
} |
| 447 |
} |
| 448 |
|
| 449 |
|
| 450 |
void |
| 451 |
freepkids( /* free pnode's children */ |
| 452 |
PNODE *p |
| 453 |
) |
| 454 |
{ |
| 455 |
if (p->kid == NULL) |
| 456 |
return; |
| 457 |
freepkids(p->kid+DL); |
| 458 |
freepkids(p->kid+DR); |
| 459 |
freepkids(p->kid+UL); |
| 460 |
freepkids(p->kid+UR); |
| 461 |
free((void *)p->kid); |
| 462 |
p->kid = NULL; |
| 463 |
} |
| 464 |
|
| 465 |
|
| 466 |
void |
| 467 |
newview( /* change viewing parameters */ |
| 468 |
VIEW *vp |
| 469 |
) |
| 470 |
{ |
| 471 |
char *err; |
| 472 |
|
| 473 |
if ((err = setview(vp)) != NULL) { |
| 474 |
sprintf(errmsg, "view not set - %s", err); |
| 475 |
error(COMMAND, errmsg); |
| 476 |
} else if (memcmp((char *)vp, (char *)&ourview, sizeof(VIEW))) { |
| 477 |
oldview = ourview; |
| 478 |
ourview = *vp; |
| 479 |
newimage(NULL); |
| 480 |
} |
| 481 |
} |
| 482 |
|
| 483 |
|
| 484 |
void |
| 485 |
moveview( /* move viewpoint */ |
| 486 |
double angle, |
| 487 |
double elev, |
| 488 |
double mag, |
| 489 |
FVECT vc |
| 490 |
) |
| 491 |
{ |
| 492 |
double d; |
| 493 |
FVECT v1; |
| 494 |
VIEW nv = ourview; |
| 495 |
int i; |
| 496 |
|
| 497 |
spinvector(nv.vdir, ourview.vdir, ourview.vup, angle*(PI/180.)); |
| 498 |
if (elev != 0.0) { |
| 499 |
fcross(v1, ourview.vup, nv.vdir); |
| 500 |
normalize(v1); |
| 501 |
spinvector(nv.vdir, nv.vdir, v1, elev*(PI/180.)); |
| 502 |
} |
| 503 |
if (nv.type == VT_PAR) { |
| 504 |
nv.horiz /= mag; |
| 505 |
nv.vert /= mag; |
| 506 |
d = 0.0; /* don't move closer */ |
| 507 |
for (i = 0; i < 3; i++) |
| 508 |
d += (vc[i] - ourview.vp[i])*ourview.vdir[i]; |
| 509 |
} else { |
| 510 |
d = sqrt(dist2(ourview.vp, vc)) / mag; |
| 511 |
if (nv.vfore > FTINY) { |
| 512 |
nv.vfore += d - d*mag; |
| 513 |
if (nv.vfore < 0.0) nv.vfore = 0.0; |
| 514 |
} |
| 515 |
if (nv.vaft > FTINY) { |
| 516 |
nv.vaft += d - d*mag; |
| 517 |
if (nv.vaft <= nv.vfore) nv.vaft = 0.0; |
| 518 |
} |
| 519 |
nv.vdist /= mag; |
| 520 |
} |
| 521 |
for (i = 0; i < 3; i++) |
| 522 |
nv.vp[i] = vc[i] - d*nv.vdir[i]; |
| 523 |
newview(&nv); |
| 524 |
} |
| 525 |
|
| 526 |
|
| 527 |
void |
| 528 |
pcopy( /* copy paint node p1 into p2 */ |
| 529 |
PNODE *p1, |
| 530 |
PNODE *p2 |
| 531 |
) |
| 532 |
{ |
| 533 |
copycolor(p2->v, p1->v); |
| 534 |
p2->x = p1->x; |
| 535 |
p2->y = p1->y; |
| 536 |
} |
| 537 |
|
| 538 |
|
| 539 |
void |
| 540 |
zoomview( /* zoom in or out */ |
| 541 |
VIEW *vp, |
| 542 |
double zf |
| 543 |
) |
| 544 |
{ |
| 545 |
switch (vp->type) { |
| 546 |
case VT_PAR: /* parallel view */ |
| 547 |
vp->horiz /= zf; |
| 548 |
vp->vert /= zf; |
| 549 |
return; |
| 550 |
case VT_ANG: /* angular fisheye */ |
| 551 |
vp->horiz /= zf; |
| 552 |
if (vp->horiz > 360.) |
| 553 |
vp->horiz = 360.; |
| 554 |
vp->vert /= zf; |
| 555 |
if (vp->vert > 360.) |
| 556 |
vp->vert = 360.; |
| 557 |
return; |
| 558 |
case VT_PLS: /* planisphere fisheye */ |
| 559 |
vp->horiz = sin((PI/180./2.)*vp->horiz) / |
| 560 |
(1.0 + cos((PI/180./2.)*vp->horiz)) / zf; |
| 561 |
vp->horiz *= vp->horiz; |
| 562 |
vp->horiz = (2.*180./PI)*acos((1. - vp->horiz) / |
| 563 |
(1. + vp->horiz)); |
| 564 |
vp->vert = sin((PI/180./2.)*vp->vert) / |
| 565 |
(1.0 + cos((PI/180./2.)*vp->vert)) / zf; |
| 566 |
vp->vert *= vp->vert; |
| 567 |
vp->vert = (2.*180./PI)*acos((1. - vp->vert) / |
| 568 |
(1. + vp->vert)); |
| 569 |
return; |
| 570 |
case VT_CYL: /* cylindrical panorama */ |
| 571 |
vp->horiz /= zf; |
| 572 |
if (vp->horiz > 360.) |
| 573 |
vp->horiz = 360.; |
| 574 |
vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / (PI/180./2.); |
| 575 |
return; |
| 576 |
case VT_PER: /* perspective view */ |
| 577 |
vp->horiz = atan(tan(vp->horiz*(PI/180./2.))/zf) / |
| 578 |
(PI/180./2.); |
| 579 |
vp->vert = atan(tan(vp->vert*(PI/180./2.))/zf) / |
| 580 |
(PI/180./2.); |
| 581 |
return; |
| 582 |
case VT_HEM: /* hemispherical fisheye */ |
| 583 |
vp->horiz = sin(vp->horiz*(PI/180./2.))/zf; |
| 584 |
if (vp->horiz >= 1.0-FTINY) |
| 585 |
vp->horiz = 180.; |
| 586 |
else |
| 587 |
vp->horiz = asin(vp->horiz) / (PI/180./2.); |
| 588 |
vp->vert = sin(vp->vert*(PI/180./2.))/zf; |
| 589 |
if (vp->vert >= 1.0-FTINY) |
| 590 |
vp->vert = 180.; |
| 591 |
else |
| 592 |
vp->vert = asin(vp->vert) / (PI/180./2.); |
| 593 |
return; |
| 594 |
} |
| 595 |
} |
