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 |
|
|
29 |
|
int input_orient = 0; |
30 |
|
int output_orient = 0; |
31 |
|
|
32 |
+ |
/* BSDF histogram */ |
33 |
+ |
unsigned long bsdf_hist[HISTLEN]; |
34 |
+ |
|
35 |
+ |
/* BSDF value for boundary regions */ |
36 |
+ |
double bsdf_min = 0; |
37 |
+ |
float bsdf_spec_peak = 0; |
38 |
+ |
int bsdf_spec_crad = 0; |
39 |
+ |
|
40 |
|
/* processed incident DSF measurements */ |
41 |
|
RBFNODE *dsf_list = NULL; |
42 |
|
|
93 |
|
int |
94 |
|
use_symmetry(FVECT vec) |
95 |
|
{ |
96 |
< |
double phi = get_phi360(vec); |
96 |
> |
const double phi = get_phi360(vec); |
97 |
|
|
98 |
|
switch (inp_coverage) { |
99 |
|
case INP_QUAD1|INP_QUAD2|INP_QUAD3|INP_QUAD4: |
200 |
|
int pos[2]; |
201 |
|
int n; |
202 |
|
|
203 |
< |
for (n = rbf->nrbf; n-- > 0; ) { |
203 |
> |
for (n = (cos(phi) < 1.-FTINY)*rbf->nrbf; n-- > 0; ) { |
204 |
|
ovec_from_pos(outvec, rbf->rbfa[n].gx, rbf->rbfa[n].gy); |
205 |
|
spinvector(outvec, outvec, vnorm, phi); |
206 |
|
pos_from_vec(pos, outvec); |
210 |
|
VCOPY(rbf->invec, invec); |
211 |
|
} |
212 |
|
|
202 |
– |
/* Compute volume associated with Gaussian lobe */ |
203 |
– |
double |
204 |
– |
rbf_volume(const RBFVAL *rbfp) |
205 |
– |
{ |
206 |
– |
double rad = R2ANG(rbfp->crad); |
207 |
– |
|
208 |
– |
return((2.*M_PI) * rbfp->peak * rad*rad); |
209 |
– |
} |
210 |
– |
|
213 |
|
/* Compute outgoing vector from grid position */ |
214 |
|
void |
215 |
|
ovec_from_pos(FVECT vec, int xpos, int ypos) |
239 |
|
pos[1] = (int)(sq[1]*grid_res); |
240 |
|
} |
241 |
|
|
242 |
< |
/* Evaluate RBF for DSF at the given normalized outgoing direction */ |
242 |
> |
/* Compute volume associated with Gaussian lobe */ |
243 |
|
double |
244 |
+ |
rbf_volume(const RBFVAL *rbfp) |
245 |
+ |
{ |
246 |
+ |
double rad = R2ANG(rbfp->crad); |
247 |
+ |
FVECT odir; |
248 |
+ |
double elev, integ; |
249 |
+ |
/* infinite integral approximation */ |
250 |
+ |
integ = (2.*M_PI) * rbfp->peak * rad*rad; |
251 |
+ |
/* check if we're near horizon */ |
252 |
+ |
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
253 |
+ |
elev = output_orient*odir[2]; |
254 |
+ |
/* apply cut-off correction if > 1% */ |
255 |
+ |
if (elev < 2.8*rad) { |
256 |
+ |
/* elev = asin(elev); /* this is so crude, anyway... */ |
257 |
+ |
integ *= 1. - .5*exp(-.5*elev*elev/(rad*rad)); |
258 |
+ |
} |
259 |
+ |
return(integ); |
260 |
+ |
} |
261 |
+ |
|
262 |
+ |
/* Evaluate BSDF at the given normalized outgoing direction */ |
263 |
+ |
double |
264 |
|
eval_rbfrep(const RBFNODE *rp, const FVECT outvec) |
265 |
|
{ |
266 |
+ |
const double rfact2 = (38./M_PI/M_PI)*(grid_res*grid_res); |
267 |
+ |
int pos[2]; |
268 |
|
double res = 0; |
269 |
|
const RBFVAL *rbfp; |
270 |
|
FVECT odir; |
271 |
< |
double sig2; |
271 |
> |
double rad2; |
272 |
|
int n; |
273 |
< |
|
274 |
< |
if (rp == NULL) |
273 |
> |
/* check for wrong side */ |
274 |
> |
if (outvec[2] > 0 ^ output_orient > 0) |
275 |
|
return(.0); |
276 |
+ |
/* use minimum if no information avail. */ |
277 |
+ |
if (rp == NULL) |
278 |
+ |
return(bsdf_min); |
279 |
+ |
/* optimization for fast lobe culling */ |
280 |
+ |
pos_from_vec(pos, outvec); |
281 |
+ |
/* sum radial basis function */ |
282 |
|
rbfp = rp->rbfa; |
283 |
|
for (n = rp->nrbf; n--; rbfp++) { |
284 |
+ |
int d2 = (pos[0]-rbfp->gx)*(pos[0]-rbfp->gx) + |
285 |
+ |
(pos[1]-rbfp->gy)*(pos[1]-rbfp->gy); |
286 |
+ |
rad2 = R2ANG(rbfp->crad); |
287 |
+ |
rad2 *= rad2; |
288 |
+ |
if (d2 > rad2*rfact2) |
289 |
+ |
continue; |
290 |
|
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
291 |
< |
sig2 = R2ANG(rbfp->crad); |
256 |
< |
sig2 = (DOT(odir,outvec) - 1.) / (sig2*sig2); |
257 |
< |
if (sig2 > -19.) |
258 |
< |
res += rbfp->peak * exp(sig2); |
291 |
> |
res += rbfp->peak * exp((DOT(odir,outvec) - 1.) / rad2); |
292 |
|
} |
293 |
+ |
res /= output_orient*outvec[2]; |
294 |
+ |
if (res < bsdf_min) /* never return less than bsdf_min */ |
295 |
+ |
return(bsdf_min); |
296 |
|
return(res); |
297 |
|
} |
298 |
|
|
306 |
|
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) |
307 |
|
if (DOT(rbf->invec, newrbf->invec) >= 1.-FTINY) { |
308 |
|
fprintf(stderr, |
309 |
< |
"%s: Duplicate incident measurement (ignored)\n", |
310 |
< |
progname); |
309 |
> |
"%s: Duplicate incident measurement ignored at (%.1f,%.1f)\n", |
310 |
> |
progname, get_theta180(newrbf->invec), |
311 |
> |
get_phi360(newrbf->invec)); |
312 |
|
free(newrbf); |
313 |
|
return(-1); |
314 |
|
} |
396 |
|
return((rbfv[0] != NULL) + (rbfv[1] != NULL)); |
397 |
|
} |
398 |
|
|
399 |
+ |
/* Return single-lobe specular RBF for the given incident direction */ |
400 |
+ |
RBFNODE * |
401 |
+ |
def_rbf_spec(const FVECT invec) |
402 |
+ |
{ |
403 |
+ |
RBFNODE *rbf; |
404 |
+ |
FVECT ovec; |
405 |
+ |
int pos[2]; |
406 |
+ |
|
407 |
+ |
if (input_orient > 0 ^ invec[2] > 0) /* wrong side? */ |
408 |
+ |
return(NULL); |
409 |
+ |
if ((bsdf_spec_peak <= bsdf_min) | (bsdf_spec_crad <= 0)) |
410 |
+ |
return(NULL); /* nothing set */ |
411 |
+ |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE)); |
412 |
+ |
if (rbf == NULL) |
413 |
+ |
return(NULL); |
414 |
+ |
ovec[0] = -invec[0]; |
415 |
+ |
ovec[1] = -invec[1]; |
416 |
+ |
ovec[2] = invec[2]*(2*(input_orient==output_orient) - 1); |
417 |
+ |
pos_from_vec(pos, ovec); |
418 |
+ |
rbf->ord = 0; |
419 |
+ |
rbf->next = NULL; |
420 |
+ |
rbf->ejl = NULL; |
421 |
+ |
VCOPY(rbf->invec, invec); |
422 |
+ |
rbf->nrbf = 1; |
423 |
+ |
rbf->rbfa[0].peak = bsdf_spec_peak * output_orient*ovec[2]; |
424 |
+ |
rbf->rbfa[0].crad = bsdf_spec_crad; |
425 |
+ |
rbf->rbfa[0].gx = pos[0]; |
426 |
+ |
rbf->rbfa[0].gy = pos[1]; |
427 |
+ |
rbf->vtotal = rbf_volume(rbf->rbfa); |
428 |
+ |
return(rbf); |
429 |
+ |
} |
430 |
+ |
|
431 |
+ |
/* Advect and allocate new RBF along edge (internal call) */ |
432 |
+ |
RBFNODE * |
433 |
+ |
e_advect_rbf(const MIGRATION *mig, const FVECT invec, int lobe_lim) |
434 |
+ |
{ |
435 |
+ |
double cthresh = FTINY; |
436 |
+ |
RBFNODE *rbf; |
437 |
+ |
int n, i, j; |
438 |
+ |
double t, full_dist; |
439 |
+ |
/* get relative position */ |
440 |
+ |
t = Acos(DOT(invec, mig->rbfv[0]->invec)); |
441 |
+ |
if (t < M_PI/grid_res) { /* near first DSF */ |
442 |
+ |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1); |
443 |
+ |
rbf = (RBFNODE *)malloc(n); |
444 |
+ |
if (rbf == NULL) |
445 |
+ |
goto memerr; |
446 |
+ |
memcpy(rbf, mig->rbfv[0], n); /* just duplicate */ |
447 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
448 |
+ |
return(rbf); |
449 |
+ |
} |
450 |
+ |
full_dist = acos(DOT(mig->rbfv[0]->invec, mig->rbfv[1]->invec)); |
451 |
+ |
if (t > full_dist-M_PI/grid_res) { /* near second DSF */ |
452 |
+ |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[1]->nrbf-1); |
453 |
+ |
rbf = (RBFNODE *)malloc(n); |
454 |
+ |
if (rbf == NULL) |
455 |
+ |
goto memerr; |
456 |
+ |
memcpy(rbf, mig->rbfv[1], n); /* just duplicate */ |
457 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
458 |
+ |
return(rbf); |
459 |
+ |
} |
460 |
+ |
t /= full_dist; |
461 |
+ |
tryagain: |
462 |
+ |
n = 0; /* count migrating particles */ |
463 |
+ |
for (i = 0; i < mtx_nrows(mig); i++) |
464 |
+ |
for (j = 0; j < mtx_ncols(mig); j++) |
465 |
+ |
n += (mtx_coef(mig,i,j) > cthresh); |
466 |
+ |
/* are we over our limit? */ |
467 |
+ |
if ((lobe_lim > 0) & (n > lobe_lim)) { |
468 |
+ |
cthresh = cthresh*2. + 10.*FTINY; |
469 |
+ |
goto tryagain; |
470 |
+ |
} |
471 |
+ |
#ifdef DEBUG |
472 |
+ |
fprintf(stderr, "Input RBFs have %d, %d nodes -> output has %d\n", |
473 |
+ |
mig->rbfv[0]->nrbf, mig->rbfv[1]->nrbf, n); |
474 |
+ |
#endif |
475 |
+ |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
476 |
+ |
if (rbf == NULL) |
477 |
+ |
goto memerr; |
478 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
479 |
+ |
VCOPY(rbf->invec, invec); |
480 |
+ |
rbf->nrbf = n; |
481 |
+ |
rbf->vtotal = 1.-t + t*mig->rbfv[1]->vtotal/mig->rbfv[0]->vtotal; |
482 |
+ |
n = 0; /* advect RBF lobes */ |
483 |
+ |
for (i = 0; i < mtx_nrows(mig); i++) { |
484 |
+ |
const RBFVAL *rbf0i = &mig->rbfv[0]->rbfa[i]; |
485 |
+ |
const float peak0 = rbf0i->peak; |
486 |
+ |
const double rad0 = R2ANG(rbf0i->crad); |
487 |
+ |
FVECT v0; |
488 |
+ |
float mv; |
489 |
+ |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
490 |
+ |
for (j = 0; j < mtx_ncols(mig); j++) |
491 |
+ |
if ((mv = mtx_coef(mig,i,j)) > cthresh) { |
492 |
+ |
const RBFVAL *rbf1j = &mig->rbfv[1]->rbfa[j]; |
493 |
+ |
double rad2; |
494 |
+ |
FVECT v; |
495 |
+ |
int pos[2]; |
496 |
+ |
rad2 = R2ANG(rbf1j->crad); |
497 |
+ |
rad2 = rad0*rad0*(1.-t) + rad2*rad2*t; |
498 |
+ |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal * |
499 |
+ |
rad0*rad0/rad2; |
500 |
+ |
rbf->rbfa[n].crad = ANG2R(sqrt(rad2)); |
501 |
+ |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy); |
502 |
+ |
geodesic(v, v0, v, t, GEOD_REL); |
503 |
+ |
pos_from_vec(pos, v); |
504 |
+ |
rbf->rbfa[n].gx = pos[0]; |
505 |
+ |
rbf->rbfa[n].gy = pos[1]; |
506 |
+ |
++n; |
507 |
+ |
} |
508 |
+ |
} |
509 |
+ |
rbf->vtotal *= mig->rbfv[0]->vtotal; /* turn ratio into actual */ |
510 |
+ |
return(rbf); |
511 |
+ |
memerr: |
512 |
+ |
fprintf(stderr, "%s: Out of memory in e_advect_rbf()\n", progname); |
513 |
+ |
exit(1); |
514 |
+ |
return(NULL); /* pro forma return */ |
515 |
+ |
} |
516 |
+ |
|
517 |
|
/* Clear our BSDF representation and free memory */ |
518 |
|
void |
519 |
|
clear_bsdf_rep(void) |
528 |
|
dsf_list = rbf->next; |
529 |
|
free(rbf); |
530 |
|
} |
531 |
+ |
bsdf_name[0] = '\0'; |
532 |
+ |
bsdf_manuf[0] = '\0'; |
533 |
|
inp_coverage = 0; |
534 |
|
single_plane_incident = -1; |
535 |
|
input_orient = output_orient = 0; |
536 |
|
grid_res = GRIDRES; |
537 |
+ |
bsdf_min = 0; |
538 |
+ |
bsdf_spec_peak = 0; |
539 |
+ |
bsdf_spec_crad = 0; |
540 |
|
} |
541 |
|
|
542 |
|
/* Write our BSDF mesh interpolant out to the given binary stream */ |
547 |
|
MIGRATION *mig; |
548 |
|
int i, n; |
549 |
|
/* finish header */ |
550 |
+ |
if (bsdf_name[0]) |
551 |
+ |
fprintf(ofp, "NAME=%s\n", bsdf_name); |
552 |
+ |
if (bsdf_manuf[0]) |
553 |
+ |
fprintf(ofp, "MANUFACT=%s\n", bsdf_manuf); |
554 |
|
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
555 |
|
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
556 |
|
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
557 |
+ |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min); |
558 |
+ |
if ((bsdf_spec_peak > bsdf_min) & (bsdf_spec_crad > 0)) |
559 |
+ |
fprintf(ofp, "BSDFSPEC= %f %f\n", bsdf_spec_peak, |
560 |
+ |
R2ANG(bsdf_spec_crad)); |
561 |
|
fputformat(BSDFREP_FMT, ofp); |
562 |
|
fputc('\n', ofp); |
563 |
|
/* write each DSF */ |
610 |
|
{ |
611 |
|
char fmt[32]; |
612 |
|
|
613 |
+ |
if (!strncmp(s, "NAME=", 5)) { |
614 |
+ |
strcpy(bsdf_name, s+5); |
615 |
+ |
bsdf_name[strlen(bsdf_name)-1] = '\0'; |
616 |
+ |
} |
617 |
+ |
if (!strncmp(s, "MANUFACT=", 9)) { |
618 |
+ |
strcpy(bsdf_manuf, s+9); |
619 |
+ |
bsdf_manuf[strlen(bsdf_manuf)-1] = '\0'; |
620 |
+ |
} |
621 |
|
if (!strncmp(s, "SYMMETRY=", 9)) { |
622 |
|
inp_coverage = atoi(s+9); |
623 |
|
single_plane_incident = !inp_coverage; |
631 |
|
sscanf(s+8, "%d", &grid_res); |
632 |
|
return(0); |
633 |
|
} |
634 |
+ |
if (!strncmp(s, "BSDFMIN=", 8)) { |
635 |
+ |
sscanf(s+8, "%lf", &bsdf_min); |
636 |
+ |
return(0); |
637 |
+ |
} |
638 |
+ |
if (!strncmp(s, "BSDFSPEC=", 9)) { |
639 |
+ |
float bsdf_spec_rad = 0; |
640 |
+ |
sscanf(s+9, "%f %f", &bsdf_spec_peak, &bsdf_spec_rad); |
641 |
+ |
bsdf_spec_crad = ANG2R(bsdf_spec_rad); |
642 |
+ |
return(0); |
643 |
+ |
} |
644 |
|
if (formatval(fmt, s) && strcmp(fmt, BSDFREP_FMT)) |
645 |
|
return(-1); |
646 |
|
return(0); |
657 |
|
clear_bsdf_rep(); |
658 |
|
if (ifp == NULL) |
659 |
|
return(0); |
660 |
< |
if (getheader(ifp, headline, NULL) < 0 || single_plane_incident < 0 | |
661 |
< |
!input_orient | !output_orient) { |
660 |
> |
if (getheader(ifp, headline, NULL) < 0 || (single_plane_incident < 0) | |
661 |
> |
!input_orient | !output_orient | |
662 |
> |
(grid_res < 16) | (grid_res > 256)) { |
663 |
|
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n", |
664 |
|
progname); |
665 |
|
return(0); |
666 |
|
} |
667 |
< |
rbfh.next = NULL; /* read each DSF */ |
481 |
< |
rbfh.ejl = NULL; |
667 |
> |
memset(&rbfh, 0, sizeof(rbfh)); /* read each DSF */ |
668 |
|
while ((rbfh.ord = getint(4, ifp)) >= 0) { |
669 |
|
RBFNODE *newrbf; |
670 |
|
|
681 |
|
sizeof(RBFVAL)*(rbfh.nrbf-1)); |
682 |
|
if (newrbf == NULL) |
683 |
|
goto memerr; |
684 |
< |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)-sizeof(RBFVAL)); |
684 |
> |
*newrbf = rbfh; |
685 |
|
for (i = 0; i < rbfh.nrbf; i++) { |
686 |
|
newrbf->rbfa[i].peak = getflt(ifp); |
687 |
|
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff; |