/* Add normal direction if missing */
static void
check_normal_incidence(void)
{
static FVECT norm_vec = {.0, .0, 1.};
const int saved_nprocs = nprocs;
RBFNODE *near_rbf, *mir_rbf, *rbf;
double bestd;
int n;
if (dsf_list == NULL)
return; /* XXX should be error? */
near_rbf = dsf_list;
bestd = input_orient*near_rbf->invec[2];
if (single_plane_incident) { /* ordered plane incidence? */
if (bestd >= 1.-2.*FTINY)
return; /* already have normal */
} else {
switch (inp_coverage) {
case INP_QUAD1:
case INP_QUAD2:
case INP_QUAD3:
case INP_QUAD4:
break; /* quadrilateral symmetry? */
default:
return; /* else we can interpolate */
}
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) {
const double d = input_orient*rbf->invec[2];
if (d >= 1.-2.*FTINY)
return; /* seems we have normal */
if (d > bestd) {
near_rbf = rbf;
bestd = d;
}
}
}
if (mig_list != NULL) { /* need to be called first */
fprintf(stderr, "%s: Late call to check_normal_incidence()\n",
progname);
exit(1);
}
#ifdef DEBUG
fprintf(stderr, "Interpolating normal incidence by mirroring (%.1f,%.1f)\n",
get_theta180(near_rbf->invec), get_phi360(near_rbf->invec));
#endif
/* mirror nearest incidence */
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(near_rbf->nrbf-1);
mir_rbf = (RBFNODE *)malloc(n);
if (mir_rbf == NULL)
goto memerr;
memcpy(mir_rbf, near_rbf, n);
mir_rbf->ord = near_rbf->ord - 1; /* not used, I think */
mir_rbf->next = NULL;
mir_rbf->ejl = NULL;
rev_rbf_symmetry(mir_rbf, MIRROR_X|MIRROR_Y);
nprocs = 1; /* compute migration matrix */
if (create_migration(mir_rbf, near_rbf) == NULL)
exit(1); /* XXX should never happen! */
norm_vec[2] = input_orient; /* interpolate normal dist. */
rbf = e_advect_rbf(mig_list, norm_vec, 0);
nprocs = saved_nprocs; /* final clean-up */
free(mir_rbf);
free(mig_list);
mig_list = near_rbf->ejl = NULL;
insert_dsf(rbf); /* insert interpolated normal */
return;
memerr:
fprintf(stderr, "%s: Out of memory in check_normal_incidence()\n",
progname);
exit(1);
}
/* Read a BSDF mesh interpolant from the given binary stream */
int
load_bsdf_rep(FILE *ifp)
{
RBFNODE rbfh;
int from_ord, to_ord;
int i;
clear_bsdf_rep();
if (ifp == NULL)
return(0);
if (getheader(ifp, headline, NULL) < 0 || single_plane_incident < 0 |
!input_orient | !output_orient) {
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n",
progname);
return(0);
}
rbfh.next = NULL; /* read each DSF */
rbfh.ejl = NULL;
while ((rbfh.ord = getint(4, ifp)) >= 0) {
RBFNODE *newrbf;
rbfh.invec[0] = getflt(ifp);
rbfh.invec[1] = getflt(ifp);
rbfh.invec[2] = getflt(ifp);
if (normalize(rbfh.invec) == 0) {
fprintf(stderr, "%s: zero incident vector\n", progname);
return(0);
}
rbfh.vtotal = getflt(ifp);
rbfh.nrbf = getint(4, ifp);
newrbf = (RBFNODE *)malloc(sizeof(RBFNODE) +
sizeof(RBFVAL)*(rbfh.nrbf-1));
if (newrbf == NULL)
goto memerr;
memcpy(newrbf, &rbfh, sizeof(RBFNODE)-sizeof(RBFVAL));
for (i = 0; i < rbfh.nrbf; i++) {
newrbf->rbfa[i].peak = getflt(ifp);
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff;
newrbf->rbfa[i].gx = getint(1, ifp) & 0xff;
newrbf->rbfa[i].gy = getint(1, ifp) & 0xff;
}
if (feof(ifp))
goto badEOF;
/* insert in global list */
if (insert_dsf(newrbf) != rbfh.ord) {
fprintf(stderr, "%s: error adding DSF\n", progname);
return(0);
}
}
/* read each migration matrix */
while ((from_ord = getint(4, ifp)) >= 0 &&
(to_ord = getint(4, ifp)) >= 0) {
RBFNODE *from_rbf = get_dsf(from_ord);
RBFNODE *to_rbf = get_dsf(to_ord);
MIGRATION *newmig;
int n;
if ((from_rbf == NULL) | (to_rbf == NULL)) {
fprintf(stderr,
"%s: bad DSF reference in migration edge\n",
progname);
return(0);
}
n = from_rbf->nrbf * to_rbf->nrbf;
newmig = (MIGRATION *)malloc(sizeof(MIGRATION) +
sizeof(float)*(n-1));
if (newmig == NULL)
goto memerr;
newmig->rbfv[0] = from_rbf;
newmig->rbfv[1] = to_rbf;
memset(newmig->mtx, 0, sizeof(float)*n);
for (i = 0; ; ) { /* read sparse data */
int zc = getint(1, ifp) & 0xff;
if ((i += zc) >= n)
break;
if (zc == 0xff)
continue;
newmig->mtx[i++] = getflt(ifp);
}
if (feof(ifp))
goto badEOF;
/* insert in edge lists */
newmig->enxt[0] = from_rbf->ejl;
from_rbf->ejl = newmig;
newmig->enxt[1] = to_rbf->ejl;
to_rbf->ejl = newmig;
/* push onto global list */
newmig->next = mig_list;
mig_list = newmig;
}
return(1); /* success! */
memerr:
fprintf(stderr, "%s: Out of memory in load_bsdf_rep()\n", progname);
exit(1);
badEOF:
fprintf(stderr, "%s: Unexpected EOF in load_bsdf_rep()\n", progname);
return(0);
}
/* Count up filled nodes and build RBF representation from current grid */
RBFNODE *
make_rbfrep(void)
{
int niter = 16;
double lastVar, thisVar = 100.;
int nn;
RBFNODE *newnode;
RBFVAL *itera;
int i, j;
/* compute RBF radii */
compute_radii();
/* coagulate lobes */
cull_values();
nn = 0; /* count selected bins */
for (i = 0; i < GRIDRES; i++)
for (j = 0; j < GRIDRES; j++)
nn += dsf_grid[i][j].nval;
/* compute minimum BSDF */
comp_bsdf_min();
/* allocate RBF array */
newnode = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(nn-1));
if (newnode == NULL)
goto memerr;
newnode->ord = -1;
newnode->next = NULL;
newnode->ejl = NULL;
newnode->invec[2] = sin((M_PI/180.)*theta_in_deg);
newnode->invec[0] = cos((M_PI/180.)*phi_in_deg)*newnode->invec[2];
newnode->invec[1] = sin((M_PI/180.)*phi_in_deg)*newnode->invec[2];
newnode->invec[2] = input_orient*sqrt(1. - newnode->invec[2]*newnode->invec[2]);
newnode->vtotal = 0;
newnode->nrbf = nn;
nn = 0; /* fill RBF array */
for (i = 0; i < GRIDRES; i++)
for (j = 0; j < GRIDRES; j++)
if (dsf_grid[i][j].nval) {
newnode->rbfa[nn].peak = dsf_grid[i][j].vsum;
newnode->rbfa[nn].crad = RSCA*dsf_grid[i][j].crad + .5;
newnode->rbfa[nn].gx = i;
newnode->rbfa[nn].gy = j;
++nn;
}
/* iterate to improve interpolation accuracy */
itera = (RBFVAL *)malloc(sizeof(RBFVAL)*newnode->nrbf);
if (itera == NULL)
goto memerr;
memcpy(itera, newnode->rbfa, sizeof(RBFVAL)*newnode->nrbf);
do {
double dsum = 0, dsum2 = 0;
nn = 0;
for (i = 0; i < GRIDRES; i++)
for (j = 0; j < GRIDRES; j++)
if (dsf_grid[i][j].nval) {
FVECT odir;
double corr;
ovec_from_pos(odir, i, j);
itera[nn++].peak *= corr =
dsf_grid[i][j].vsum /
eval_rbfrep(newnode, odir);
dsum += 1. - corr;
dsum2 += (1.-corr)*(1.-corr);
}
memcpy(newnode->rbfa, itera, sizeof(RBFVAL)*newnode->nrbf);
lastVar = thisVar;
thisVar = dsum2/(double)nn;
#ifdef DEBUG
fprintf(stderr, "Avg., RMS error: %.1f%% %.1f%%\n",
100.*dsum/(double)nn,
100.*sqrt(thisVar));
#endif
} while (--niter > 0 && lastVar-thisVar > 0.02*lastVar);
free(itera);
nn = 0; /* compute sum for normalization */
while (nn < newnode->nrbf)
newnode->vtotal += rbf_volume(&newnode->rbfa[nn++]);
#ifdef DEBUG
fprintf(stderr, "Integrated DSF at (%.1f,%.1f) deg. is %.2f\n",
get_theta180(newnode->invec), get_phi360(newnode->invec),
newnode->vtotal);
#endif
insert_dsf(newnode);
return(newnode);
memerr:
fprintf(stderr, "%s: Out of memory in make_rbfrep()\n", progname);
exit(1);
}
