| 94 |
|
cos_a = DOT(ej->rbfv[0]->invec, ivec); |
| 95 |
|
if (cos_a <= 0) |
| 96 |
|
return(0); |
| 97 |
+ |
if (cos_a >= 1.) /* handles rounding error */ |
| 98 |
+ |
return(1); |
| 99 |
|
|
| 100 |
|
cos_b = DOT(ej->rbfv[1]->invec, ivec); |
| 101 |
|
if (cos_b <= 0) |
| 102 |
|
return(0); |
| 103 |
+ |
if (cos_b >= 1.) |
| 104 |
+ |
return(1); |
| 105 |
|
|
| 106 |
|
cos_aplusb = cos_a*cos_b - sqrt((1.-cos_a*cos_a)*(1.-cos_b*cos_b)); |
| 107 |
|
if (cos_aplusb <= 0) |
| 208 |
|
if (single_plane_incident) { /* isotropic BSDF? */ |
| 209 |
|
RBFNODE *rbf; /* find edge we're on */ |
| 210 |
|
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) { |
| 211 |
< |
if (input_orient*rbf->invec[2] < input_orient*invec[2]) |
| 211 |
> |
if (input_orient*rbf->invec[2] < input_orient*invec[2]-FTINY) |
| 212 |
|
break; |
| 213 |
|
if (rbf->next != NULL && input_orient*rbf->next->invec[2] < |
| 214 |
< |
input_orient*invec[2]) { |
| 214 |
> |
input_orient*invec[2]+FTINY) { |
| 215 |
|
for (miga[0] = rbf->ejl; miga[0] != NULL; |
| 216 |
|
miga[0] = nextedge(rbf,miga[0])) |
| 217 |
|
if (opp_rbf(rbf,miga[0]) == rbf->next) { |
| 218 |
< |
double nf = 1. - rbf->invec[2]*rbf->invec[2]; |
| 218 |
> |
double nf = 1. - |
| 219 |
> |
rbf->next->invec[2]*rbf->next->invec[2]; |
| 220 |
|
if (nf > FTINY) { /* rotate to match */ |
| 221 |
|
nf = sqrt((1.-invec[2]*invec[2])/nf); |
| 222 |
< |
invec[0] = nf*rbf->invec[0]; |
| 223 |
< |
invec[1] = nf*rbf->invec[1]; |
| 222 |
> |
invec[0] = nf*rbf->next->invec[0]; |
| 223 |
> |
invec[1] = nf*rbf->next->invec[1]; |
| 224 |
|
} |
| 225 |
< |
return(0); |
| 225 |
> |
return(0); /* rotational symmetry */ |
| 226 |
|
} |
| 227 |
|
break; |
| 228 |
|
} |
| 263 |
|
} |
| 264 |
|
} |
| 265 |
|
|
| 266 |
< |
/* Advect and allocate new RBF along edge */ |
| 262 |
< |
static RBFNODE * |
| 263 |
< |
e_advect_rbf(const MIGRATION *mig, const FVECT invec, int lobe_lim) |
| 264 |
< |
{ |
| 265 |
< |
double cthresh = FTINY; |
| 266 |
< |
RBFNODE *rbf; |
| 267 |
< |
int n, i, j; |
| 268 |
< |
double t, full_dist; |
| 269 |
< |
/* get relative position */ |
| 270 |
< |
t = Acos(DOT(invec, mig->rbfv[0]->invec)); |
| 271 |
< |
if (t < M_PI/grid_res) { /* near first DSF */ |
| 272 |
< |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1); |
| 273 |
< |
rbf = (RBFNODE *)malloc(n); |
| 274 |
< |
if (rbf == NULL) |
| 275 |
< |
goto memerr; |
| 276 |
< |
memcpy(rbf, mig->rbfv[0], n); /* just duplicate */ |
| 277 |
< |
rbf->next = NULL; rbf->ejl = NULL; |
| 278 |
< |
return(rbf); |
| 279 |
< |
} |
| 280 |
< |
full_dist = acos(DOT(mig->rbfv[0]->invec, mig->rbfv[1]->invec)); |
| 281 |
< |
if (t > full_dist-M_PI/grid_res) { /* near second DSF */ |
| 282 |
< |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[1]->nrbf-1); |
| 283 |
< |
rbf = (RBFNODE *)malloc(n); |
| 284 |
< |
if (rbf == NULL) |
| 285 |
< |
goto memerr; |
| 286 |
< |
memcpy(rbf, mig->rbfv[1], n); /* just duplicate */ |
| 287 |
< |
rbf->next = NULL; rbf->ejl = NULL; |
| 288 |
< |
return(rbf); |
| 289 |
< |
} |
| 290 |
< |
t /= full_dist; |
| 291 |
< |
tryagain: |
| 292 |
< |
n = 0; /* count migrating particles */ |
| 293 |
< |
for (i = 0; i < mtx_nrows(mig); i++) |
| 294 |
< |
for (j = 0; j < mtx_ncols(mig); j++) |
| 295 |
< |
n += (mtx_coef(mig,i,j) > cthresh); |
| 296 |
< |
/* are we over our limit? */ |
| 297 |
< |
if ((lobe_lim > 0) & (n > lobe_lim)) { |
| 298 |
< |
cthresh = cthresh*2. + 10.*FTINY; |
| 299 |
< |
goto tryagain; |
| 300 |
< |
} |
| 301 |
< |
#ifdef DEBUG |
| 302 |
< |
fprintf(stderr, "Input RBFs have %d, %d nodes -> output has %d\n", |
| 303 |
< |
mig->rbfv[0]->nrbf, mig->rbfv[1]->nrbf, n); |
| 304 |
< |
#endif |
| 305 |
< |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
| 306 |
< |
if (rbf == NULL) |
| 307 |
< |
goto memerr; |
| 308 |
< |
rbf->next = NULL; rbf->ejl = NULL; |
| 309 |
< |
VCOPY(rbf->invec, invec); |
| 310 |
< |
rbf->nrbf = n; |
| 311 |
< |
rbf->vtotal = 1.-t + t*mig->rbfv[1]->vtotal/mig->rbfv[0]->vtotal; |
| 312 |
< |
n = 0; /* advect RBF lobes */ |
| 313 |
< |
for (i = 0; i < mtx_nrows(mig); i++) { |
| 314 |
< |
const RBFVAL *rbf0i = &mig->rbfv[0]->rbfa[i]; |
| 315 |
< |
const float peak0 = rbf0i->peak; |
| 316 |
< |
const double rad0 = R2ANG(rbf0i->crad); |
| 317 |
< |
FVECT v0; |
| 318 |
< |
float mv; |
| 319 |
< |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
| 320 |
< |
for (j = 0; j < mtx_ncols(mig); j++) |
| 321 |
< |
if ((mv = mtx_coef(mig,i,j)) > cthresh) { |
| 322 |
< |
const RBFVAL *rbf1j = &mig->rbfv[1]->rbfa[j]; |
| 323 |
< |
double rad2; |
| 324 |
< |
FVECT v; |
| 325 |
< |
int pos[2]; |
| 326 |
< |
rad2 = R2ANG(rbf1j->crad); |
| 327 |
< |
rad2 = rad0*rad0*(1.-t) + rad2*rad2*t; |
| 328 |
< |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal * |
| 329 |
< |
rad0*rad0/rad2; |
| 330 |
< |
rbf->rbfa[n].crad = ANG2R(sqrt(rad2)); |
| 331 |
< |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy); |
| 332 |
< |
geodesic(v, v0, v, t, GEOD_REL); |
| 333 |
< |
pos_from_vec(pos, v); |
| 334 |
< |
rbf->rbfa[n].gx = pos[0]; |
| 335 |
< |
rbf->rbfa[n].gy = pos[1]; |
| 336 |
< |
++n; |
| 337 |
< |
} |
| 338 |
< |
} |
| 339 |
< |
rbf->vtotal *= mig->rbfv[0]->vtotal; /* turn ratio into actual */ |
| 340 |
< |
return(rbf); |
| 341 |
< |
memerr: |
| 342 |
< |
fprintf(stderr, "%s: Out of memory in e_advect_rbf()\n", progname); |
| 343 |
< |
exit(1); |
| 344 |
< |
return(NULL); /* pro forma return */ |
| 345 |
< |
} |
| 346 |
< |
|
| 347 |
< |
/* Partially advect between recorded incident angles and allocate new RBF */ |
| 266 |
> |
/* Advect between recorded incident angles and allocate new RBF */ |
| 267 |
|
RBFNODE * |
| 268 |
|
advect_rbf(const FVECT invec, int lobe_lim) |
| 269 |
|
{ |
| 280 |
|
VCOPY(sivec, invec); /* find triangle/edge */ |
| 281 |
|
sym = get_interp(miga, sivec); |
| 282 |
|
if (sym < 0) /* can't interpolate? */ |
| 283 |
< |
return(NULL); |
| 283 |
> |
return(def_rbf_spec(invec)); |
| 284 |
|
if (miga[1] == NULL) { /* advect along edge? */ |
| 285 |
|
rbf = e_advect_rbf(miga[0], sivec, lobe_lim); |
| 286 |
|
if (single_plane_incident) |
| 290 |
|
return(rbf); |
| 291 |
|
} |
| 292 |
|
#ifdef DEBUG |
| 293 |
< |
if (miga[0]->rbfv[0] != miga[2]->rbfv[0] | |
| 294 |
< |
miga[0]->rbfv[1] != miga[1]->rbfv[0] | |
| 295 |
< |
miga[1]->rbfv[1] != miga[2]->rbfv[1]) { |
| 293 |
> |
if ((miga[0]->rbfv[0] != miga[2]->rbfv[0]) | |
| 294 |
> |
(miga[0]->rbfv[1] != miga[1]->rbfv[0]) | |
| 295 |
> |
(miga[1]->rbfv[1] != miga[2]->rbfv[1])) { |
| 296 |
|
fprintf(stderr, "%s: Triangle vertex screw-up!\n", progname); |
| 297 |
|
exit(1); |
| 298 |
|
} |
