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 |
+ |
|
23 |
|
/* coverage/symmetry using INP_QUAD? flags */ |
24 |
|
int inp_coverage = 0; |
25 |
|
/* all incident angles in-plane so far? */ |
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 |
+ |
|
38 |
|
/* processed incident DSF measurements */ |
39 |
|
RBFNODE *dsf_list = NULL; |
40 |
|
|
65 |
|
new_theta = -new_theta; |
66 |
|
new_phi += 180.; |
67 |
|
} |
68 |
+ |
if ((theta_in_deg = new_theta) < 1.0) |
69 |
+ |
return(1); /* don't rely on phi near normal */ |
70 |
|
while (new_phi < 0) |
71 |
|
new_phi += 360.; |
72 |
|
while (new_phi >= 360.) |
75 |
|
single_plane_incident = (round(new_phi) == round(phi_in_deg)); |
76 |
|
else if (single_plane_incident < 0) |
77 |
|
single_plane_incident = 1; |
64 |
– |
theta_in_deg = new_theta; /* assume it's OK */ |
78 |
|
phi_in_deg = new_phi; |
79 |
|
if ((1. < new_phi) & (new_phi < 89.)) |
80 |
|
inp_coverage |= INP_QUAD1; |
91 |
|
int |
92 |
|
use_symmetry(FVECT vec) |
93 |
|
{ |
94 |
< |
double phi = get_phi360(vec); |
94 |
> |
const double phi = get_phi360(vec); |
95 |
|
|
96 |
|
switch (inp_coverage) { |
97 |
|
case INP_QUAD1|INP_QUAD2|INP_QUAD3|INP_QUAD4: |
181 |
|
rev_symmetry(rbf->invec, sym); |
182 |
|
if (sym & MIRROR_X) |
183 |
|
for (n = rbf->nrbf; n-- > 0; ) |
184 |
< |
rbf->rbfa[n].gx = GRIDRES-1 - rbf->rbfa[n].gx; |
184 |
> |
rbf->rbfa[n].gx = grid_res-1 - rbf->rbfa[n].gx; |
185 |
|
if (sym & MIRROR_Y) |
186 |
|
for (n = rbf->nrbf; n-- > 0; ) |
187 |
< |
rbf->rbfa[n].gy = GRIDRES-1 - rbf->rbfa[n].gy; |
187 |
> |
rbf->rbfa[n].gy = grid_res-1 - rbf->rbfa[n].gy; |
188 |
|
} |
189 |
|
|
190 |
< |
/* Compute volume associated with Gaussian lobe */ |
191 |
< |
double |
192 |
< |
rbf_volume(const RBFVAL *rbfp) |
190 |
> |
/* Rotate RBF to correspond to given incident vector */ |
191 |
> |
void |
192 |
> |
rotate_rbf(RBFNODE *rbf, const FVECT invec) |
193 |
|
{ |
194 |
< |
double rad = R2ANG(rbfp->crad); |
194 |
> |
static const FVECT vnorm = {.0, .0, 1.}; |
195 |
> |
const double phi = atan2(invec[1],invec[0]) - |
196 |
> |
atan2(rbf->invec[1],rbf->invec[0]); |
197 |
> |
FVECT outvec; |
198 |
> |
int pos[2]; |
199 |
> |
int n; |
200 |
|
|
201 |
< |
return((2.*M_PI) * rbfp->peak * rad*rad); |
201 |
> |
for (n = ((-.01 > phi) | (phi > .01))*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); |
205 |
> |
rbf->rbfa[n].gx = pos[0]; |
206 |
> |
rbf->rbfa[n].gy = pos[1]; |
207 |
> |
} |
208 |
> |
VCOPY(rbf->invec, invec); |
209 |
|
} |
210 |
|
|
211 |
|
/* Compute outgoing vector from grid position */ |
215 |
|
double uv[2]; |
216 |
|
double r2; |
217 |
|
|
218 |
< |
SDsquare2disk(uv, (1./GRIDRES)*(xpos+.5), (1./GRIDRES)*(ypos+.5)); |
218 |
> |
SDsquare2disk(uv, (xpos+.5)/grid_res, (ypos+.5)/grid_res); |
219 |
|
/* uniform hemispherical projection */ |
220 |
|
r2 = uv[0]*uv[0] + uv[1]*uv[1]; |
221 |
|
vec[0] = vec[1] = sqrt(2. - r2); |
233 |
|
|
234 |
|
SDdisk2square(sq, vec[0]*norm, vec[1]*norm); |
235 |
|
|
236 |
< |
pos[0] = (int)(sq[0]*GRIDRES); |
237 |
< |
pos[1] = (int)(sq[1]*GRIDRES); |
236 |
> |
pos[0] = (int)(sq[0]*grid_res); |
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 |
< |
double res = .0; |
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 |
< |
|
273 |
< |
if (rp == NULL) |
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 |
+ |
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); |
231 |
< |
sig2 = (DOT(odir,outvec) - 1.) / (sig2*sig2); |
232 |
< |
if (sig2 > -19.) |
233 |
< |
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 |
|
|
407 |
|
dsf_list = rbf->next; |
408 |
|
free(rbf); |
409 |
|
} |
410 |
+ |
bsdf_name[0] = '\0'; |
411 |
+ |
bsdf_manuf[0] = '\0'; |
412 |
|
inp_coverage = 0; |
413 |
|
single_plane_incident = -1; |
414 |
|
input_orient = output_orient = 0; |
415 |
+ |
grid_res = GRIDRES; |
416 |
|
} |
417 |
|
|
418 |
|
/* Write our BSDF mesh interpolant out to the given binary stream */ |
423 |
|
MIGRATION *mig; |
424 |
|
int i, n; |
425 |
|
/* finish header */ |
426 |
+ |
if (bsdf_name[0]) |
427 |
+ |
fprintf(ofp, "NAME=%s\n", bsdf_name); |
428 |
+ |
if (bsdf_manuf[0]) |
429 |
+ |
fprintf(ofp, "MANUFACT=%s\n", bsdf_manuf); |
430 |
|
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
431 |
|
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
432 |
+ |
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
433 |
+ |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min); |
434 |
|
fputformat(BSDFREP_FMT, ofp); |
435 |
|
fputc('\n', ofp); |
436 |
|
/* write each DSF */ |
483 |
|
{ |
484 |
|
char fmt[32]; |
485 |
|
|
486 |
+ |
if (!strncmp(s, "NAME=", 5)) { |
487 |
+ |
strcpy(bsdf_name, s+5); |
488 |
+ |
bsdf_name[strlen(bsdf_name)-1] = '\0'; |
489 |
+ |
} |
490 |
+ |
if (!strncmp(s, "MANUFACT=", 9)) { |
491 |
+ |
strcpy(bsdf_manuf, s+9); |
492 |
+ |
bsdf_manuf[strlen(bsdf_manuf)-1] = '\0'; |
493 |
+ |
} |
494 |
|
if (!strncmp(s, "SYMMETRY=", 9)) { |
495 |
|
inp_coverage = atoi(s+9); |
496 |
|
single_plane_incident = !inp_coverage; |
500 |
|
sscanf(s+9, "%d %d", &input_orient, &output_orient); |
501 |
|
return(0); |
502 |
|
} |
503 |
+ |
if (!strncmp(s, "GRIDRES=", 8)) { |
504 |
+ |
sscanf(s+8, "%d", &grid_res); |
505 |
+ |
return(0); |
506 |
+ |
} |
507 |
+ |
if (!strncmp(s, "BSDFMIN=", 8)) { |
508 |
+ |
sscanf(s+8, "%lf", &bsdf_min); |
509 |
+ |
return(0); |
510 |
+ |
} |
511 |
|
if (formatval(fmt, s) && strcmp(fmt, BSDFREP_FMT)) |
512 |
|
return(-1); |
513 |
|
return(0); |
522 |
|
int i; |
523 |
|
|
524 |
|
clear_bsdf_rep(); |
525 |
+ |
if (ifp == NULL) |
526 |
+ |
return(0); |
527 |
|
if (getheader(ifp, headline, NULL) < 0 || single_plane_incident < 0 | |
528 |
|
!input_orient | !output_orient) { |
529 |
|
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n", |
530 |
|
progname); |
531 |
|
return(0); |
532 |
|
} |
533 |
< |
rbfh.next = NULL; /* read each DSF */ |
448 |
< |
rbfh.ejl = NULL; |
533 |
> |
memset(&rbfh, 0, sizeof(rbfh)); /* read each DSF */ |
534 |
|
while ((rbfh.ord = getint(4, ifp)) >= 0) { |
535 |
|
RBFNODE *newrbf; |
536 |
|
|
537 |
|
rbfh.invec[0] = getflt(ifp); |
538 |
|
rbfh.invec[1] = getflt(ifp); |
539 |
|
rbfh.invec[2] = getflt(ifp); |
540 |
+ |
if (normalize(rbfh.invec) == 0) { |
541 |
+ |
fprintf(stderr, "%s: zero incident vector\n", progname); |
542 |
+ |
return(0); |
543 |
+ |
} |
544 |
|
rbfh.vtotal = getflt(ifp); |
545 |
|
rbfh.nrbf = getint(4, ifp); |
546 |
|
newrbf = (RBFNODE *)malloc(sizeof(RBFNODE) + |
547 |
|
sizeof(RBFVAL)*(rbfh.nrbf-1)); |
548 |
|
if (newrbf == NULL) |
549 |
|
goto memerr; |
550 |
< |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)); |
550 |
> |
*newrbf = rbfh; |
551 |
|
for (i = 0; i < rbfh.nrbf; i++) { |
552 |
|
newrbf->rbfa[i].peak = getflt(ifp); |
553 |
|
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff; |