14 |
|
#include "rtio.h" |
15 |
|
#include "resolu.h" |
16 |
|
#include "bsdfrep.h" |
17 |
+ |
/* name and manufacturer if known */ |
18 |
+ |
char bsdf_name[256]; |
19 |
+ |
char bsdf_manuf[256]; |
20 |
|
/* active grid resolution */ |
21 |
|
int grid_res = GRIDRES; |
22 |
|
|
30 |
|
int output_orient = 0; |
31 |
|
|
32 |
|
/* BSDF histogram */ |
33 |
< |
int bsdf_hist[HISTLEN]; |
33 |
> |
unsigned long bsdf_hist[HISTLEN]; |
34 |
|
|
35 |
|
/* BSDF value for boundary regions */ |
36 |
|
double bsdf_min = 0; |
198 |
|
int pos[2]; |
199 |
|
int n; |
200 |
|
|
201 |
< |
for (n = ((-.01 > phi) | (phi > .01))*rbf->nrbf; n-- > 0; ) { |
201 |
> |
for (n = (cos(phi) < 1.-FTINY)*rbf->nrbf; n-- > 0; ) { |
202 |
|
ovec_from_pos(outvec, rbf->rbfa[n].gx, rbf->rbfa[n].gy); |
203 |
|
spinvector(outvec, outvec, vnorm, phi); |
204 |
|
pos_from_vec(pos, outvec); |
208 |
|
VCOPY(rbf->invec, invec); |
209 |
|
} |
210 |
|
|
208 |
– |
/* Compute volume associated with Gaussian lobe */ |
209 |
– |
double |
210 |
– |
rbf_volume(const RBFVAL *rbfp) |
211 |
– |
{ |
212 |
– |
double rad = R2ANG(rbfp->crad); |
213 |
– |
|
214 |
– |
return((2.*M_PI) * rbfp->peak * rad*rad); |
215 |
– |
} |
216 |
– |
|
211 |
|
/* Compute outgoing vector from grid position */ |
212 |
|
void |
213 |
|
ovec_from_pos(FVECT vec, int xpos, int ypos) |
237 |
|
pos[1] = (int)(sq[1]*grid_res); |
238 |
|
} |
239 |
|
|
240 |
+ |
/* Compute volume associated with Gaussian lobe */ |
241 |
+ |
double |
242 |
+ |
rbf_volume(const RBFVAL *rbfp) |
243 |
+ |
{ |
244 |
+ |
double rad = R2ANG(rbfp->crad); |
245 |
+ |
FVECT odir; |
246 |
+ |
double elev, integ; |
247 |
+ |
/* infinite integral approximation */ |
248 |
+ |
integ = (2.*M_PI) * rbfp->peak * rad*rad; |
249 |
+ |
/* check if we're near horizon */ |
250 |
+ |
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
251 |
+ |
elev = output_orient*odir[2]; |
252 |
+ |
/* apply cut-off correction if > 1% */ |
253 |
+ |
if (elev < 2.8*rad) { |
254 |
+ |
/* elev = asin(elev); /* this is so crude, anyway... */ |
255 |
+ |
integ *= 1. - .5*exp(-.5*elev*elev/(rad*rad)); |
256 |
+ |
} |
257 |
+ |
return(integ); |
258 |
+ |
} |
259 |
+ |
|
260 |
|
/* Evaluate RBF for DSF at the given normalized outgoing direction */ |
261 |
|
double |
262 |
|
eval_rbfrep(const RBFNODE *rp, const FVECT outvec) |
263 |
|
{ |
264 |
+ |
const double rfact2 = (38./M_PI/M_PI)*(grid_res*grid_res); |
265 |
+ |
double minval = bsdf_min*output_orient*outvec[2]; |
266 |
+ |
int pos[2]; |
267 |
|
double res = 0; |
268 |
|
const RBFVAL *rbfp; |
269 |
|
FVECT odir; |
270 |
< |
double sig2; |
270 |
> |
double rad2; |
271 |
|
int n; |
272 |
+ |
/* check for wrong side */ |
273 |
+ |
if (outvec[2] > 0 ^ output_orient > 0) |
274 |
+ |
return(.0); |
275 |
|
/* use minimum if no information avail. */ |
276 |
< |
if (rp == NULL) { |
277 |
< |
if (outvec[2] > 0 ^ output_orient > 0) |
278 |
< |
return(.0); |
279 |
< |
return(bsdf_min*output_orient*outvec[2]); |
280 |
< |
} |
276 |
> |
if (rp == NULL) |
277 |
> |
return(minval); |
278 |
> |
/* optimization for fast lobe culling */ |
279 |
> |
pos_from_vec(pos, outvec); |
280 |
> |
/* sum radial basis function */ |
281 |
|
rbfp = rp->rbfa; |
282 |
|
for (n = rp->nrbf; n--; rbfp++) { |
283 |
+ |
int d2 = (pos[0]-rbfp->gx)*(pos[0]-rbfp->gx) + |
284 |
+ |
(pos[1]-rbfp->gy)*(pos[1]-rbfp->gy); |
285 |
+ |
rad2 = R2ANG(rbfp->crad); |
286 |
+ |
rad2 *= rad2; |
287 |
+ |
if (d2 > rad2*rfact2) |
288 |
+ |
continue; |
289 |
|
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
290 |
< |
sig2 = R2ANG(rbfp->crad); |
265 |
< |
sig2 = (DOT(odir,outvec) - 1.) / (sig2*sig2); |
266 |
< |
if (sig2 > -19.) |
267 |
< |
res += rbfp->peak * exp(sig2); |
290 |
> |
res += rbfp->peak * exp((DOT(odir,outvec) - 1.) / rad2); |
291 |
|
} |
292 |
+ |
if (res < minval) /* never return less than minval */ |
293 |
+ |
return(minval); |
294 |
|
return(res); |
295 |
|
} |
296 |
|
|
304 |
|
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) |
305 |
|
if (DOT(rbf->invec, newrbf->invec) >= 1.-FTINY) { |
306 |
|
fprintf(stderr, |
307 |
< |
"%s: Duplicate incident measurement (ignored)\n", |
308 |
< |
progname); |
307 |
> |
"%s: Duplicate incident measurement ignored at (%.1f,%.1f)\n", |
308 |
> |
progname, get_theta180(newrbf->invec), |
309 |
> |
get_phi360(newrbf->invec)); |
310 |
|
free(newrbf); |
311 |
|
return(-1); |
312 |
|
} |
394 |
|
return((rbfv[0] != NULL) + (rbfv[1] != NULL)); |
395 |
|
} |
396 |
|
|
397 |
+ |
/* Advect and allocate new RBF along edge (internal call) */ |
398 |
+ |
RBFNODE * |
399 |
+ |
e_advect_rbf(const MIGRATION *mig, const FVECT invec, int lobe_lim) |
400 |
+ |
{ |
401 |
+ |
double cthresh = FTINY; |
402 |
+ |
RBFNODE *rbf; |
403 |
+ |
int n, i, j; |
404 |
+ |
double t, full_dist; |
405 |
+ |
/* get relative position */ |
406 |
+ |
t = Acos(DOT(invec, mig->rbfv[0]->invec)); |
407 |
+ |
if (t < M_PI/grid_res) { /* near first DSF */ |
408 |
+ |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1); |
409 |
+ |
rbf = (RBFNODE *)malloc(n); |
410 |
+ |
if (rbf == NULL) |
411 |
+ |
goto memerr; |
412 |
+ |
memcpy(rbf, mig->rbfv[0], n); /* just duplicate */ |
413 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
414 |
+ |
return(rbf); |
415 |
+ |
} |
416 |
+ |
full_dist = acos(DOT(mig->rbfv[0]->invec, mig->rbfv[1]->invec)); |
417 |
+ |
if (t > full_dist-M_PI/grid_res) { /* near second DSF */ |
418 |
+ |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[1]->nrbf-1); |
419 |
+ |
rbf = (RBFNODE *)malloc(n); |
420 |
+ |
if (rbf == NULL) |
421 |
+ |
goto memerr; |
422 |
+ |
memcpy(rbf, mig->rbfv[1], n); /* just duplicate */ |
423 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
424 |
+ |
return(rbf); |
425 |
+ |
} |
426 |
+ |
t /= full_dist; |
427 |
+ |
tryagain: |
428 |
+ |
n = 0; /* count migrating particles */ |
429 |
+ |
for (i = 0; i < mtx_nrows(mig); i++) |
430 |
+ |
for (j = 0; j < mtx_ncols(mig); j++) |
431 |
+ |
n += (mtx_coef(mig,i,j) > cthresh); |
432 |
+ |
/* are we over our limit? */ |
433 |
+ |
if ((lobe_lim > 0) & (n > lobe_lim)) { |
434 |
+ |
cthresh = cthresh*2. + 10.*FTINY; |
435 |
+ |
goto tryagain; |
436 |
+ |
} |
437 |
+ |
#ifdef DEBUG |
438 |
+ |
fprintf(stderr, "Input RBFs have %d, %d nodes -> output has %d\n", |
439 |
+ |
mig->rbfv[0]->nrbf, mig->rbfv[1]->nrbf, n); |
440 |
+ |
#endif |
441 |
+ |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
442 |
+ |
if (rbf == NULL) |
443 |
+ |
goto memerr; |
444 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
445 |
+ |
VCOPY(rbf->invec, invec); |
446 |
+ |
rbf->nrbf = n; |
447 |
+ |
rbf->vtotal = 1.-t + t*mig->rbfv[1]->vtotal/mig->rbfv[0]->vtotal; |
448 |
+ |
n = 0; /* advect RBF lobes */ |
449 |
+ |
for (i = 0; i < mtx_nrows(mig); i++) { |
450 |
+ |
const RBFVAL *rbf0i = &mig->rbfv[0]->rbfa[i]; |
451 |
+ |
const float peak0 = rbf0i->peak; |
452 |
+ |
const double rad0 = R2ANG(rbf0i->crad); |
453 |
+ |
FVECT v0; |
454 |
+ |
float mv; |
455 |
+ |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
456 |
+ |
for (j = 0; j < mtx_ncols(mig); j++) |
457 |
+ |
if ((mv = mtx_coef(mig,i,j)) > cthresh) { |
458 |
+ |
const RBFVAL *rbf1j = &mig->rbfv[1]->rbfa[j]; |
459 |
+ |
double rad2; |
460 |
+ |
FVECT v; |
461 |
+ |
int pos[2]; |
462 |
+ |
rad2 = R2ANG(rbf1j->crad); |
463 |
+ |
rad2 = rad0*rad0*(1.-t) + rad2*rad2*t; |
464 |
+ |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal * |
465 |
+ |
rad0*rad0/rad2; |
466 |
+ |
rbf->rbfa[n].crad = ANG2R(sqrt(rad2)); |
467 |
+ |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy); |
468 |
+ |
geodesic(v, v0, v, t, GEOD_REL); |
469 |
+ |
pos_from_vec(pos, v); |
470 |
+ |
rbf->rbfa[n].gx = pos[0]; |
471 |
+ |
rbf->rbfa[n].gy = pos[1]; |
472 |
+ |
++n; |
473 |
+ |
} |
474 |
+ |
} |
475 |
+ |
rbf->vtotal *= mig->rbfv[0]->vtotal; /* turn ratio into actual */ |
476 |
+ |
return(rbf); |
477 |
+ |
memerr: |
478 |
+ |
fprintf(stderr, "%s: Out of memory in e_advect_rbf()\n", progname); |
479 |
+ |
exit(1); |
480 |
+ |
return(NULL); /* pro forma return */ |
481 |
+ |
} |
482 |
+ |
|
483 |
|
/* Clear our BSDF representation and free memory */ |
484 |
|
void |
485 |
|
clear_bsdf_rep(void) |
494 |
|
dsf_list = rbf->next; |
495 |
|
free(rbf); |
496 |
|
} |
497 |
+ |
bsdf_name[0] = '\0'; |
498 |
+ |
bsdf_manuf[0] = '\0'; |
499 |
|
inp_coverage = 0; |
500 |
|
single_plane_incident = -1; |
501 |
|
input_orient = output_orient = 0; |
510 |
|
MIGRATION *mig; |
511 |
|
int i, n; |
512 |
|
/* finish header */ |
513 |
+ |
if (bsdf_name[0]) |
514 |
+ |
fprintf(ofp, "NAME=%s\n", bsdf_name); |
515 |
+ |
if (bsdf_manuf[0]) |
516 |
+ |
fprintf(ofp, "MANUFACT=%s\n", bsdf_manuf); |
517 |
|
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
518 |
|
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
519 |
|
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
570 |
|
{ |
571 |
|
char fmt[32]; |
572 |
|
|
573 |
+ |
if (!strncmp(s, "NAME=", 5)) { |
574 |
+ |
strcpy(bsdf_name, s+5); |
575 |
+ |
bsdf_name[strlen(bsdf_name)-1] = '\0'; |
576 |
+ |
} |
577 |
+ |
if (!strncmp(s, "MANUFACT=", 9)) { |
578 |
+ |
strcpy(bsdf_manuf, s+9); |
579 |
+ |
bsdf_manuf[strlen(bsdf_manuf)-1] = '\0'; |
580 |
+ |
} |
581 |
|
if (!strncmp(s, "SYMMETRY=", 9)) { |
582 |
|
inp_coverage = atoi(s+9); |
583 |
|
single_plane_incident = !inp_coverage; |
611 |
|
clear_bsdf_rep(); |
612 |
|
if (ifp == NULL) |
613 |
|
return(0); |
614 |
< |
if (getheader(ifp, headline, NULL) < 0 || single_plane_incident < 0 | |
615 |
< |
!input_orient | !output_orient) { |
614 |
> |
if (getheader(ifp, headline, NULL) < 0 || (single_plane_incident < 0) | |
615 |
> |
!input_orient | !output_orient | |
616 |
> |
(grid_res < 16) | (grid_res > 256)) { |
617 |
|
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n", |
618 |
|
progname); |
619 |
|
return(0); |
620 |
|
} |
621 |
< |
rbfh.next = NULL; /* read each DSF */ |
495 |
< |
rbfh.ejl = NULL; |
621 |
> |
memset(&rbfh, 0, sizeof(rbfh)); /* read each DSF */ |
622 |
|
while ((rbfh.ord = getint(4, ifp)) >= 0) { |
623 |
|
RBFNODE *newrbf; |
624 |
|
|
635 |
|
sizeof(RBFVAL)*(rbfh.nrbf-1)); |
636 |
|
if (newrbf == NULL) |
637 |
|
goto memerr; |
638 |
< |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)-sizeof(RBFVAL)); |
638 |
> |
*newrbf = rbfh; |
639 |
|
for (i = 0; i < rbfh.nrbf; i++) { |
640 |
|
newrbf->rbfa[i].peak = getflt(ifp); |
641 |
|
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff; |