14 |
|
#include "rtio.h" |
15 |
|
#include "resolu.h" |
16 |
|
#include "bsdfrep.h" |
17 |
+ |
/* active grid resolution */ |
18 |
+ |
int grid_res = GRIDRES; |
19 |
+ |
|
20 |
|
/* coverage/symmetry using INP_QUAD? flags */ |
21 |
|
int inp_coverage = 0; |
22 |
|
/* all incident angles in-plane so far? */ |
26 |
|
int input_orient = 0; |
27 |
|
int output_orient = 0; |
28 |
|
|
29 |
+ |
/* BSDF histogram */ |
30 |
+ |
int bsdf_hist[HISTLEN]; |
31 |
+ |
|
32 |
+ |
/* BSDF value for boundary regions */ |
33 |
+ |
double bsdf_min = 0; |
34 |
+ |
|
35 |
|
/* processed incident DSF measurements */ |
36 |
|
RBFNODE *dsf_list = NULL; |
37 |
|
|
62 |
|
new_theta = -new_theta; |
63 |
|
new_phi += 180.; |
64 |
|
} |
65 |
+ |
if ((theta_in_deg = new_theta) < 1.0) |
66 |
+ |
return(1); /* don't rely on phi near normal */ |
67 |
|
while (new_phi < 0) |
68 |
|
new_phi += 360.; |
69 |
|
while (new_phi >= 360.) |
72 |
|
single_plane_incident = (round(new_phi) == round(phi_in_deg)); |
73 |
|
else if (single_plane_incident < 0) |
74 |
|
single_plane_incident = 1; |
64 |
– |
theta_in_deg = new_theta; /* assume it's OK */ |
75 |
|
phi_in_deg = new_phi; |
76 |
|
if ((1. < new_phi) & (new_phi < 89.)) |
77 |
|
inp_coverage |= INP_QUAD1; |
88 |
|
int |
89 |
|
use_symmetry(FVECT vec) |
90 |
|
{ |
91 |
< |
double phi = get_phi360(vec); |
91 |
> |
const double phi = get_phi360(vec); |
92 |
|
|
93 |
|
switch (inp_coverage) { |
94 |
|
case INP_QUAD1|INP_QUAD2|INP_QUAD3|INP_QUAD4: |
178 |
|
rev_symmetry(rbf->invec, sym); |
179 |
|
if (sym & MIRROR_X) |
180 |
|
for (n = rbf->nrbf; n-- > 0; ) |
181 |
< |
rbf->rbfa[n].gx = GRIDRES-1 - rbf->rbfa[n].gx; |
181 |
> |
rbf->rbfa[n].gx = grid_res-1 - rbf->rbfa[n].gx; |
182 |
|
if (sym & MIRROR_Y) |
183 |
|
for (n = rbf->nrbf; n-- > 0; ) |
184 |
< |
rbf->rbfa[n].gy = GRIDRES-1 - rbf->rbfa[n].gy; |
184 |
> |
rbf->rbfa[n].gy = grid_res-1 - rbf->rbfa[n].gy; |
185 |
|
} |
186 |
|
|
187 |
+ |
/* Rotate RBF to correspond to given incident vector */ |
188 |
+ |
void |
189 |
+ |
rotate_rbf(RBFNODE *rbf, const FVECT invec) |
190 |
+ |
{ |
191 |
+ |
static const FVECT vnorm = {.0, .0, 1.}; |
192 |
+ |
const double phi = atan2(invec[1],invec[0]) - |
193 |
+ |
atan2(rbf->invec[1],rbf->invec[0]); |
194 |
+ |
FVECT outvec; |
195 |
+ |
int pos[2]; |
196 |
+ |
int n; |
197 |
+ |
|
198 |
+ |
for (n = ((-.01 > phi) | (phi > .01))*rbf->nrbf; n-- > 0; ) { |
199 |
+ |
ovec_from_pos(outvec, rbf->rbfa[n].gx, rbf->rbfa[n].gy); |
200 |
+ |
spinvector(outvec, outvec, vnorm, phi); |
201 |
+ |
pos_from_vec(pos, outvec); |
202 |
+ |
rbf->rbfa[n].gx = pos[0]; |
203 |
+ |
rbf->rbfa[n].gy = pos[1]; |
204 |
+ |
} |
205 |
+ |
VCOPY(rbf->invec, invec); |
206 |
+ |
} |
207 |
+ |
|
208 |
|
/* Compute volume associated with Gaussian lobe */ |
209 |
|
double |
210 |
|
rbf_volume(const RBFVAL *rbfp) |
221 |
|
double uv[2]; |
222 |
|
double r2; |
223 |
|
|
224 |
< |
SDsquare2disk(uv, (1./GRIDRES)*(xpos+.5), (1./GRIDRES)*(ypos+.5)); |
224 |
> |
SDsquare2disk(uv, (xpos+.5)/grid_res, (ypos+.5)/grid_res); |
225 |
|
/* uniform hemispherical projection */ |
226 |
|
r2 = uv[0]*uv[0] + uv[1]*uv[1]; |
227 |
|
vec[0] = vec[1] = sqrt(2. - r2); |
239 |
|
|
240 |
|
SDdisk2square(sq, vec[0]*norm, vec[1]*norm); |
241 |
|
|
242 |
< |
pos[0] = (int)(sq[0]*GRIDRES); |
243 |
< |
pos[1] = (int)(sq[1]*GRIDRES); |
242 |
> |
pos[0] = (int)(sq[0]*grid_res); |
243 |
> |
pos[1] = (int)(sq[1]*grid_res); |
244 |
|
} |
245 |
|
|
246 |
|
/* Evaluate RBF for DSF at the given normalized outgoing direction */ |
247 |
|
double |
248 |
|
eval_rbfrep(const RBFNODE *rp, const FVECT outvec) |
249 |
|
{ |
250 |
< |
double res = .0; |
250 |
> |
double res = 0; |
251 |
|
const RBFVAL *rbfp; |
252 |
|
FVECT odir; |
253 |
|
double sig2; |
254 |
|
int n; |
255 |
< |
|
256 |
< |
if (rp == NULL) |
257 |
< |
return(.0); |
255 |
> |
/* use minimum if no information avail. */ |
256 |
> |
if (rp == NULL) { |
257 |
> |
if (outvec[2] > 0 ^ output_orient > 0) |
258 |
> |
return(.0); |
259 |
> |
return(bsdf_min*output_orient*outvec[2]); |
260 |
> |
} |
261 |
|
rbfp = rp->rbfa; |
262 |
|
for (n = rp->nrbf; n--; rbfp++) { |
263 |
|
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
385 |
|
inp_coverage = 0; |
386 |
|
single_plane_incident = -1; |
387 |
|
input_orient = output_orient = 0; |
388 |
+ |
grid_res = GRIDRES; |
389 |
|
} |
390 |
|
|
391 |
|
/* Write our BSDF mesh interpolant out to the given binary stream */ |
398 |
|
/* finish header */ |
399 |
|
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
400 |
|
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
401 |
+ |
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
402 |
+ |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min); |
403 |
|
fputformat(BSDFREP_FMT, ofp); |
404 |
|
fputc('\n', ofp); |
405 |
|
/* write each DSF */ |
461 |
|
sscanf(s+9, "%d %d", &input_orient, &output_orient); |
462 |
|
return(0); |
463 |
|
} |
464 |
+ |
if (!strncmp(s, "GRIDRES=", 8)) { |
465 |
+ |
sscanf(s+8, "%d", &grid_res); |
466 |
+ |
return(0); |
467 |
+ |
} |
468 |
+ |
if (!strncmp(s, "BSDFMIN=", 8)) { |
469 |
+ |
sscanf(s+8, "%lf", &bsdf_min); |
470 |
+ |
return(0); |
471 |
+ |
} |
472 |
|
if (formatval(fmt, s) && strcmp(fmt, BSDFREP_FMT)) |
473 |
|
return(-1); |
474 |
|
return(0); |
483 |
|
int i; |
484 |
|
|
485 |
|
clear_bsdf_rep(); |
486 |
+ |
if (ifp == NULL) |
487 |
+ |
return(0); |
488 |
|
if (getheader(ifp, headline, NULL) < 0 || single_plane_incident < 0 | |
489 |
|
!input_orient | !output_orient) { |
490 |
|
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n", |
499 |
|
rbfh.invec[0] = getflt(ifp); |
500 |
|
rbfh.invec[1] = getflt(ifp); |
501 |
|
rbfh.invec[2] = getflt(ifp); |
502 |
+ |
if (normalize(rbfh.invec) == 0) { |
503 |
+ |
fprintf(stderr, "%s: zero incident vector\n", progname); |
504 |
+ |
return(0); |
505 |
+ |
} |
506 |
|
rbfh.vtotal = getflt(ifp); |
507 |
|
rbfh.nrbf = getint(4, ifp); |
508 |
|
newrbf = (RBFNODE *)malloc(sizeof(RBFNODE) + |
509 |
|
sizeof(RBFVAL)*(rbfh.nrbf-1)); |
510 |
|
if (newrbf == NULL) |
511 |
|
goto memerr; |
512 |
< |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)); |
512 |
> |
memcpy(newrbf, &rbfh, sizeof(RBFNODE)-sizeof(RBFVAL)); |
513 |
|
for (i = 0; i < rbfh.nrbf; i++) { |
514 |
|
newrbf->rbfa[i].peak = getflt(ifp); |
515 |
|
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff; |