16 |
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#include <math.h> |
17 |
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#include "bsdf.h" |
18 |
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|
19 |
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#define DEBUG 1 |
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|
21 |
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#ifndef GRIDRES |
22 |
< |
#define GRIDRES 200 /* max. grid resolution per side */ |
22 |
> |
#define GRIDRES 200 /* grid resolution per side */ |
23 |
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#endif |
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|
25 |
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#define RSCA 2.7 /* radius scaling factor (empirical) */ |
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|
27 |
< |
#define R2ANG(c) (((c)+.5)*(M_PI/(1<<16))) |
27 |
> |
/* convert to/from coded radians */ |
28 |
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#define ANG2R(r) (int)((r)*((1<<16)/M_PI)) |
29 |
+ |
#define R2ANG(c) (((c)+.5)*(M_PI/(1<<16))) |
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|
31 |
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typedef struct { |
32 |
< |
float vsum; /* BSDF sum */ |
32 |
> |
float vsum; /* DSF sum */ |
33 |
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unsigned short nval; /* number of values in sum */ |
34 |
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unsigned short crad; /* radius (coded angle) */ |
35 |
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} GRIDVAL; /* grid value */ |
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|
37 |
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typedef struct { |
38 |
< |
float bsdf; /* lobe value at peak */ |
38 |
> |
float peak; /* lobe value at peak */ |
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unsigned short crad; /* radius (coded angle) */ |
40 |
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unsigned char gx, gy; /* grid position */ |
41 |
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} RBFVAL; /* radial basis function value */ |
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|
43 |
< |
typedef struct s_rbflist { |
44 |
< |
struct s_rbflist *next; /* next in our RBF list */ |
43 |
> |
struct s_rbfnode; /* forward declaration of RBF struct */ |
44 |
> |
|
45 |
> |
typedef struct s_migration { |
46 |
> |
struct s_migration *next; /* next in global edge list */ |
47 |
> |
struct s_rbfnode *rbfv[2]; /* from,to vertex */ |
48 |
> |
struct s_migration *enxt[2]; /* next from,to sibling */ |
49 |
> |
float mtx[1]; /* matrix (extends struct) */ |
50 |
> |
} MIGRATION; /* migration link (winged edge structure) */ |
51 |
> |
|
52 |
> |
typedef struct s_rbfnode { |
53 |
> |
struct s_rbfnode *next; /* next in global RBF list */ |
54 |
> |
MIGRATION *ejl; /* edge list for this vertex */ |
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FVECT invec; /* incident vector direction */ |
56 |
+ |
double vtotal; /* volume for normalization */ |
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int nrbf; /* number of RBFs */ |
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RBFVAL rbfa[1]; /* RBF array (extends struct) */ |
59 |
< |
} RBFLIST; /* RBF representation of BSDF @ 1 incidence */ |
59 |
> |
} RBFNODE; /* RBF representation of DSF @ 1 incidence */ |
60 |
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|
61 |
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/* our loaded grid for this incident angle */ |
62 |
< |
static double theta_in_deg, phi_in_deg; |
63 |
< |
static GRIDVAL bsdf_grid[GRIDRES][GRIDRES]; |
62 |
> |
static double theta_in_deg, phi_in_deg; |
63 |
> |
static GRIDVAL dsf_grid[GRIDRES][GRIDRES]; |
64 |
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|
65 |
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/* processed incident BSDF measurements */ |
66 |
< |
static RBFLIST *bsdf_list = NULL; |
65 |
> |
/* all incident angles in-plane so far? */ |
66 |
> |
static int single_plane_incident = -1; |
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|
68 |
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/* input/output orientations */ |
69 |
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static int input_orient = 0; |
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static int output_orient = 0; |
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|
72 |
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/* processed incident DSF measurements */ |
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static RBFNODE *dsf_list = NULL; |
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|
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/* RBF-linking matrices (edges) */ |
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static MIGRATION *mig_list = NULL; |
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|
78 |
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/* migration edges drawn in raster fashion */ |
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static MIGRATION *mig_grid[GRIDRES][GRIDRES]; |
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|
81 |
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#define mtx_nrows(m) ((m)->rbfv[0]->nrbf) |
82 |
+ |
#define mtx_ncols(m) ((m)->rbfv[1]->nrbf) |
83 |
+ |
#define mtx_ndx(m,i,j) ((i)*mtx_ncols(m) + (j)) |
84 |
+ |
#define is_src(rbf,m) ((rbf) == (m)->rbfv[0]) |
85 |
+ |
#define is_dest(rbf,m) ((rbf) == (m)->rbfv[1]) |
86 |
+ |
#define nextedge(rbf,m) (m)->enxt[is_dest(rbf,m)] |
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#define opp_rbf(rbf,m) (m)->rbfv[is_src(rbf,m)] |
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|
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#define round(v) (int)((v) + .5 - ((v) < -.5)) |
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|
91 |
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char *progname; |
92 |
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/* percentage to cull (<0 to turn off) */ |
93 |
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int pctcull = 90; |
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/* sampling order */ |
95 |
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int samp_order = 0; |
96 |
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|
97 |
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/* Compute volume associated with Gaussian lobe */ |
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static double |
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rbf_volume(const RBFVAL *rbfp) |
100 |
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{ |
101 |
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double rad = R2ANG(rbfp->crad); |
102 |
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|
103 |
+ |
return((2.*M_PI) * rbfp->peak * rad*rad); |
104 |
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} |
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|
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/* Compute outgoing vector from grid position */ |
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static void |
108 |
< |
vec_from_pos(FVECT vec, int xpos, int ypos) |
108 |
> |
ovec_from_pos(FVECT vec, int xpos, int ypos) |
109 |
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{ |
110 |
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double uv[2]; |
111 |
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double r2; |
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vec[0] = vec[1] = sqrt(2. - r2); |
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vec[0] *= uv[0]; |
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vec[1] *= uv[1]; |
119 |
< |
vec[2] = 1. - r2; |
119 |
> |
vec[2] = output_orient*(1. - r2); |
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} |
121 |
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|
122 |
< |
/* Compute grid position from normalized outgoing vector */ |
122 |
> |
/* Compute grid position from normalized input/output vector */ |
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static void |
124 |
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pos_from_vec(int pos[2], const FVECT vec) |
125 |
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{ |
126 |
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double sq[2]; /* uniform hemispherical projection */ |
127 |
< |
double norm = 1./sqrt(1. + vec[2]); |
127 |
> |
double norm = 1./sqrt(1. + fabs(vec[2])); |
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|
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SDdisk2square(sq, vec[0]*norm, vec[1]*norm); |
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|
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pos[1] = (int)(sq[1]*GRIDRES); |
133 |
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} |
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|
135 |
< |
/* Evaluate RBF for BSDF at the given normalized outgoing direction */ |
135 |
> |
/* Evaluate RBF for DSF at the given normalized outgoing direction */ |
136 |
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static double |
137 |
< |
eval_rbfrep(const RBFLIST *rp, const FVECT outvec) |
137 |
> |
eval_rbfrep(const RBFNODE *rp, const FVECT outvec) |
138 |
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{ |
139 |
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double res = .0; |
140 |
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const RBFVAL *rbfp; |
142 |
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double sig2; |
143 |
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int n; |
144 |
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|
145 |
+ |
if (rp == NULL) |
146 |
+ |
return(.0); |
147 |
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rbfp = rp->rbfa; |
148 |
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for (n = rp->nrbf; n--; rbfp++) { |
149 |
< |
vec_from_pos(odir, rbfp->gx, rbfp->gy); |
149 |
> |
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
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sig2 = R2ANG(rbfp->crad); |
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sig2 = (DOT(odir,outvec) - 1.) / (sig2*sig2); |
152 |
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if (sig2 > -19.) |
153 |
< |
res += rbfp->bsdf * exp(sig2); |
153 |
> |
res += rbfp->peak * exp(sig2); |
154 |
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} |
155 |
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return(res); |
156 |
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} |
157 |
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|
158 |
+ |
/* Insert a new directional scattering function in our global list */ |
159 |
+ |
static void |
160 |
+ |
insert_dsf(RBFNODE *newrbf) |
161 |
+ |
{ |
162 |
+ |
RBFNODE *rbf, *rbf_last; |
163 |
+ |
|
164 |
+ |
/* keep in ascending theta order */ |
165 |
+ |
for (rbf_last = NULL, rbf = dsf_list; |
166 |
+ |
single_plane_incident & (rbf != NULL); |
167 |
+ |
rbf_last = rbf, rbf = rbf->next) |
168 |
+ |
if (input_orient*rbf->invec[2] < input_orient*newrbf->invec[2]) |
169 |
+ |
break; |
170 |
+ |
if (rbf_last == NULL) { |
171 |
+ |
newrbf->next = dsf_list; |
172 |
+ |
dsf_list = newrbf; |
173 |
+ |
return; |
174 |
+ |
} |
175 |
+ |
newrbf->next = rbf; |
176 |
+ |
rbf_last->next = newrbf; |
177 |
+ |
} |
178 |
+ |
|
179 |
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/* Count up filled nodes and build RBF representation from current grid */ |
180 |
< |
static RBFLIST * |
180 |
> |
static RBFNODE * |
181 |
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make_rbfrep(void) |
182 |
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{ |
183 |
< |
int niter = 4; |
183 |
> |
int niter = 16; |
184 |
> |
int minrad = ANG2R(pow(2., 1.-samp_order)); |
185 |
> |
double lastVar, thisVar = 100.; |
186 |
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int nn; |
187 |
< |
RBFLIST *newnode; |
187 |
> |
RBFNODE *newnode; |
188 |
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int i, j; |
189 |
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|
190 |
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nn = 0; /* count selected bins */ |
191 |
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for (i = 0; i < GRIDRES; i++) |
192 |
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for (j = 0; j < GRIDRES; j++) |
193 |
< |
nn += (bsdf_grid[i][j].nval > 0); |
193 |
> |
nn += dsf_grid[i][j].nval; |
194 |
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/* allocate RBF array */ |
195 |
< |
newnode = (RBFLIST *)malloc(sizeof(RBFLIST) + sizeof(RBFVAL)*(nn-1)); |
195 |
> |
newnode = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(nn-1)); |
196 |
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if (newnode == NULL) { |
197 |
< |
fputs("Out of memory in make_rbfrep\n", stderr); |
197 |
> |
fputs("Out of memory in make_rbfrep()\n", stderr); |
198 |
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exit(1); |
199 |
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} |
200 |
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newnode->next = NULL; |
201 |
+ |
newnode->ejl = NULL; |
202 |
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newnode->invec[2] = sin(M_PI/180.*theta_in_deg); |
203 |
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newnode->invec[0] = cos(M_PI/180.*phi_in_deg)*newnode->invec[2]; |
204 |
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newnode->invec[1] = sin(M_PI/180.*phi_in_deg)*newnode->invec[2]; |
205 |
< |
newnode->invec[2] = sqrt(1. - newnode->invec[2]*newnode->invec[2]); |
205 |
> |
newnode->invec[2] = input_orient*sqrt(1. - newnode->invec[2]*newnode->invec[2]); |
206 |
> |
newnode->vtotal = 0; |
207 |
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newnode->nrbf = nn; |
208 |
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nn = 0; /* fill RBF array */ |
209 |
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for (i = 0; i < GRIDRES; i++) |
210 |
|
for (j = 0; j < GRIDRES; j++) |
211 |
< |
if (bsdf_grid[i][j].nval) { |
212 |
< |
newnode->rbfa[nn].bsdf = |
213 |
< |
bsdf_grid[i][j].vsum /= |
135 |
< |
(double)bsdf_grid[i][j].nval; |
136 |
< |
bsdf_grid[i][j].nval = 1; |
137 |
< |
newnode->rbfa[nn].crad = RSCA*bsdf_grid[i][j].crad + .5; |
211 |
> |
if (dsf_grid[i][j].nval) { |
212 |
> |
newnode->rbfa[nn].peak = dsf_grid[i][j].vsum; |
213 |
> |
newnode->rbfa[nn].crad = RSCA*dsf_grid[i][j].crad + .5; |
214 |
|
newnode->rbfa[nn].gx = i; |
215 |
|
newnode->rbfa[nn].gy = j; |
216 |
+ |
if (newnode->rbfa[nn].crad < minrad) |
217 |
+ |
minrad = newnode->rbfa[nn].crad; |
218 |
|
++nn; |
219 |
|
} |
220 |
< |
/* iterate for better convergence */ |
221 |
< |
while (niter--) { |
220 |
> |
/* iterate to improve interpolation accuracy */ |
221 |
> |
do { |
222 |
> |
double dsum = .0, dsum2 = .0; |
223 |
|
nn = 0; |
224 |
|
for (i = 0; i < GRIDRES; i++) |
225 |
|
for (j = 0; j < GRIDRES; j++) |
226 |
< |
if (bsdf_grid[i][j].nval) { |
226 |
> |
if (dsf_grid[i][j].nval) { |
227 |
|
FVECT odir; |
228 |
< |
vec_from_pos(odir, i, j); |
229 |
< |
newnode->rbfa[nn++].bsdf *= |
230 |
< |
bsdf_grid[i][j].vsum / |
228 |
> |
double corr; |
229 |
> |
ovec_from_pos(odir, i, j); |
230 |
> |
newnode->rbfa[nn++].peak *= corr = |
231 |
> |
dsf_grid[i][j].vsum / |
232 |
|
eval_rbfrep(newnode, odir); |
233 |
+ |
dsum += corr - 1.; |
234 |
+ |
dsum2 += (corr-1.)*(corr-1.); |
235 |
|
} |
236 |
< |
} |
237 |
< |
newnode->next = bsdf_list; |
238 |
< |
return(bsdf_list = newnode); |
236 |
> |
lastVar = thisVar; |
237 |
> |
thisVar = dsum2/(double)nn; |
238 |
> |
#ifdef DEBUG |
239 |
> |
fprintf(stderr, "Avg., RMS error: %.1f%% %.1f%%\n", |
240 |
> |
100.*dsum/(double)nn, |
241 |
> |
100.*sqrt(thisVar)); |
242 |
> |
#endif |
243 |
> |
} while (--niter > 0 && lastVar-thisVar > 0.02*lastVar); |
244 |
> |
|
245 |
> |
nn = 0; /* compute sum for normalization */ |
246 |
> |
while (nn < newnode->nrbf) |
247 |
> |
newnode->vtotal += rbf_volume(&newnode->rbfa[nn++]); |
248 |
> |
|
249 |
> |
insert_dsf(newnode); |
250 |
> |
/* adjust sampling resolution */ |
251 |
> |
samp_order = log(2./R2ANG(minrad))/log(2.) + .5; |
252 |
> |
|
253 |
> |
return(newnode); |
254 |
|
} |
255 |
|
|
256 |
|
/* Load a set of measurements corresponding to a particular incident angle */ |
257 |
|
static int |
258 |
< |
load_bsdf_meas(const char *fname) |
258 |
> |
load_pabopto_meas(const char *fname) |
259 |
|
{ |
260 |
|
FILE *fp = fopen(fname, "r"); |
261 |
|
int inp_is_DSF = -1; |
262 |
< |
double theta_out, phi_out, val; |
262 |
> |
double new_phi, theta_out, phi_out, val; |
263 |
|
char buf[2048]; |
264 |
|
int n, c; |
265 |
|
|
268 |
|
fputs(": cannot open\n", stderr); |
269 |
|
return(0); |
270 |
|
} |
271 |
< |
memset(bsdf_grid, 0, sizeof(bsdf_grid)); |
271 |
> |
memset(dsf_grid, 0, sizeof(dsf_grid)); |
272 |
> |
#ifdef DEBUG |
273 |
> |
fprintf(stderr, "Loading measurement file '%s'...\n", fname); |
274 |
> |
#endif |
275 |
|
/* read header information */ |
276 |
|
while ((c = getc(fp)) == '#' || c == EOF) { |
277 |
|
if (fgets(buf, sizeof(buf), fp) == NULL) { |
290 |
|
} |
291 |
|
if (sscanf(buf, "intheta %lf", &theta_in_deg) == 1) |
292 |
|
continue; |
293 |
< |
if (sscanf(buf, "inphi %lf", &phi_in_deg) == 1) |
293 |
> |
if (sscanf(buf, "inphi %lf", &new_phi) == 1) |
294 |
|
continue; |
295 |
|
if (sscanf(buf, "incident_angle %lf %lf", |
296 |
< |
&theta_in_deg, &phi_in_deg) == 2) |
296 |
> |
&theta_in_deg, &new_phi) == 2) |
297 |
|
continue; |
298 |
|
} |
299 |
|
if (inp_is_DSF < 0) { |
302 |
|
fclose(fp); |
303 |
|
return(0); |
304 |
|
} |
305 |
< |
ungetc(c, fp); /* read actual data */ |
305 |
> |
if (!input_orient) /* check input orientation */ |
306 |
> |
input_orient = 1 - 2*(theta_in_deg > 90.); |
307 |
> |
else if (input_orient > 0 ^ theta_in_deg < 90.) { |
308 |
> |
fputs("Cannot handle input angles on both sides of surface\n", |
309 |
> |
stderr); |
310 |
> |
exit(1); |
311 |
> |
} |
312 |
> |
if (single_plane_incident > 0) /* check if still in plane */ |
313 |
> |
single_plane_incident = (round(new_phi) == round(phi_in_deg)); |
314 |
> |
else if (single_plane_incident < 0) |
315 |
> |
single_plane_incident = 1; |
316 |
> |
phi_in_deg = new_phi; |
317 |
> |
ungetc(c, fp); /* read actual data */ |
318 |
|
while (fscanf(fp, "%lf %lf %lf\n", &theta_out, &phi_out, &val) == 3) { |
319 |
|
FVECT ovec; |
320 |
|
int pos[2]; |
321 |
|
|
322 |
+ |
if (!output_orient) /* check output orientation */ |
323 |
+ |
output_orient = 1 - 2*(theta_out > 90.); |
324 |
+ |
else if (output_orient > 0 ^ theta_out < 90.) { |
325 |
+ |
fputs("Cannot handle output angles on both sides of surface\n", |
326 |
+ |
stderr); |
327 |
+ |
exit(1); |
328 |
+ |
} |
329 |
|
ovec[2] = sin(M_PI/180.*theta_out); |
330 |
|
ovec[0] = cos(M_PI/180.*phi_out) * ovec[2]; |
331 |
|
ovec[1] = sin(M_PI/180.*phi_out) * ovec[2]; |
332 |
|
ovec[2] = sqrt(1. - ovec[2]*ovec[2]); |
333 |
|
|
334 |
< |
if (inp_is_DSF) |
335 |
< |
val /= ovec[2]; /* convert from DSF to BSDF */ |
334 |
> |
if (!inp_is_DSF) |
335 |
> |
val *= ovec[2]; /* convert from BSDF to DSF */ |
336 |
|
|
337 |
|
pos_from_vec(pos, ovec); |
338 |
|
|
339 |
< |
bsdf_grid[pos[0]][pos[1]].vsum += val; |
340 |
< |
bsdf_grid[pos[0]][pos[1]].nval++; |
339 |
> |
dsf_grid[pos[0]][pos[1]].vsum += val; |
340 |
> |
dsf_grid[pos[0]][pos[1]].nval++; |
341 |
|
} |
342 |
|
n = 0; |
343 |
|
while ((c = getc(fp)) != EOF) |
355 |
|
static void |
356 |
|
compute_radii(void) |
357 |
|
{ |
358 |
< |
unsigned short fill_grid[GRIDRES][GRIDRES]; |
358 |
> |
unsigned int fill_grid[GRIDRES][GRIDRES]; |
359 |
> |
unsigned short fill_cnt[GRIDRES][GRIDRES]; |
360 |
|
FVECT ovec0, ovec1; |
361 |
|
double ang2, lastang2; |
242 |
– |
int r2, lastr2; |
362 |
|
int r, i, j, jn, ii, jj, inear, jnear; |
363 |
|
|
364 |
|
r = GRIDRES/2; /* proceed in zig-zag */ |
365 |
|
for (i = 0; i < GRIDRES; i++) |
366 |
|
for (jn = 0; jn < GRIDRES; jn++) { |
367 |
|
j = (i&1) ? jn : GRIDRES-1-jn; |
368 |
< |
if (bsdf_grid[i][j].nval) /* find empty grid pos. */ |
368 |
> |
if (dsf_grid[i][j].nval) /* find empty grid pos. */ |
369 |
|
continue; |
370 |
< |
vec_from_pos(ovec0, i, j); |
370 |
> |
ovec_from_pos(ovec0, i, j); |
371 |
|
inear = jnear = -1; /* find nearest non-empty */ |
372 |
|
lastang2 = M_PI*M_PI; |
373 |
|
for (ii = i-r; ii <= i+r; ii++) { |
376 |
|
for (jj = j-r; jj <= j+r; jj++) { |
377 |
|
if (jj < 0) continue; |
378 |
|
if (jj >= GRIDRES) break; |
379 |
< |
if (!bsdf_grid[ii][jj].nval) |
379 |
> |
if (!dsf_grid[ii][jj].nval) |
380 |
|
continue; |
381 |
< |
vec_from_pos(ovec1, ii, jj); |
381 |
> |
ovec_from_pos(ovec1, ii, jj); |
382 |
|
ang2 = 2. - 2.*DOT(ovec0,ovec1); |
383 |
|
if (ang2 >= lastang2) |
384 |
|
continue; |
392 |
|
} |
393 |
|
ang2 = sqrt(lastang2); |
394 |
|
r = ANG2R(ang2); /* record if > previous */ |
395 |
< |
if (r > bsdf_grid[inear][jnear].crad) |
396 |
< |
bsdf_grid[inear][jnear].crad = r; |
395 |
> |
if (r > dsf_grid[inear][jnear].crad) |
396 |
> |
dsf_grid[inear][jnear].crad = r; |
397 |
|
/* next search radius */ |
398 |
< |
r = ang2*(2.*GRIDRES/M_PI) + 1; |
398 |
> |
r = ang2*(2.*GRIDRES/M_PI) + 3; |
399 |
|
} |
400 |
< |
/* fill in neighbors */ |
400 |
> |
/* blur radii over hemisphere */ |
401 |
|
memset(fill_grid, 0, sizeof(fill_grid)); |
402 |
+ |
memset(fill_cnt, 0, sizeof(fill_cnt)); |
403 |
|
for (i = 0; i < GRIDRES; i++) |
404 |
|
for (j = 0; j < GRIDRES; j++) { |
405 |
< |
if (!bsdf_grid[i][j].nval) |
406 |
< |
continue; /* no value -- skip */ |
407 |
< |
if (bsdf_grid[i][j].crad) |
288 |
< |
continue; /* has distance already */ |
289 |
< |
r = GRIDRES/20; |
290 |
< |
lastr2 = 2*r*r + 1; |
405 |
> |
if (!dsf_grid[i][j].crad) |
406 |
> |
continue; /* missing distance */ |
407 |
> |
r = R2ANG(dsf_grid[i][j].crad)*(2.*RSCA*GRIDRES/M_PI); |
408 |
|
for (ii = i-r; ii <= i+r; ii++) { |
409 |
|
if (ii < 0) continue; |
410 |
|
if (ii >= GRIDRES) break; |
411 |
|
for (jj = j-r; jj <= j+r; jj++) { |
412 |
|
if (jj < 0) continue; |
413 |
|
if (jj >= GRIDRES) break; |
414 |
< |
if (!bsdf_grid[ii][jj].crad) |
414 |
> |
if ((ii-i)*(ii-i) + (jj-j)*(jj-j) > r*r) |
415 |
|
continue; |
416 |
< |
/* OK to use approx. closest */ |
417 |
< |
r2 = (ii-i)*(ii-i) + (jj-j)*(jj-j); |
301 |
< |
if (r2 >= lastr2) |
302 |
< |
continue; |
303 |
< |
fill_grid[i][j] = bsdf_grid[ii][jj].crad; |
304 |
< |
lastr2 = r2; |
416 |
> |
fill_grid[ii][jj] += dsf_grid[i][j].crad; |
417 |
> |
fill_cnt[ii][jj]++; |
418 |
|
} |
419 |
|
} |
420 |
|
} |
421 |
< |
/* copy back filled entries */ |
421 |
> |
/* copy back blurred radii */ |
422 |
|
for (i = 0; i < GRIDRES; i++) |
423 |
|
for (j = 0; j < GRIDRES; j++) |
424 |
< |
if (fill_grid[i][j]) |
425 |
< |
bsdf_grid[i][j].crad = fill_grid[i][j]; |
424 |
> |
if (fill_cnt[i][j]) |
425 |
> |
dsf_grid[i][j].crad = fill_grid[i][j]/fill_cnt[i][j]; |
426 |
|
} |
427 |
|
|
428 |
< |
/* Cull points for more uniform distribution */ |
428 |
> |
/* Cull points for more uniform distribution, leave all nval 0 or 1 */ |
429 |
|
static void |
430 |
|
cull_values(void) |
431 |
|
{ |
435 |
|
/* simple greedy algorithm */ |
436 |
|
for (i = 0; i < GRIDRES; i++) |
437 |
|
for (j = 0; j < GRIDRES; j++) { |
438 |
< |
if (!bsdf_grid[i][j].nval) |
438 |
> |
if (!dsf_grid[i][j].nval) |
439 |
|
continue; |
440 |
< |
if (!bsdf_grid[i][j].crad) |
440 |
> |
if (!dsf_grid[i][j].crad) |
441 |
|
continue; /* shouldn't happen */ |
442 |
< |
vec_from_pos(ovec0, i, j); |
443 |
< |
maxang = 2.*R2ANG(bsdf_grid[i][j].crad); |
442 |
> |
ovec_from_pos(ovec0, i, j); |
443 |
> |
maxang = 2.*R2ANG(dsf_grid[i][j].crad); |
444 |
|
if (maxang > ovec0[2]) /* clamp near horizon */ |
445 |
|
maxang = ovec0[2]; |
446 |
|
r = maxang*(2.*GRIDRES/M_PI) + 1; |
451 |
|
for (jj = j-r; jj <= j+r; jj++) { |
452 |
|
if (jj < 0) continue; |
453 |
|
if (jj >= GRIDRES) break; |
454 |
< |
if (!bsdf_grid[ii][jj].nval) |
454 |
> |
if (!dsf_grid[ii][jj].nval) |
455 |
|
continue; |
456 |
|
if ((ii == i) & (jj == j)) |
457 |
|
continue; /* don't get self-absorbed */ |
458 |
< |
vec_from_pos(ovec1, ii, jj); |
458 |
> |
ovec_from_pos(ovec1, ii, jj); |
459 |
|
if (2. - 2.*DOT(ovec0,ovec1) >= maxang2) |
460 |
|
continue; |
461 |
|
/* absorb sum */ |
462 |
< |
bsdf_grid[i][j].vsum += bsdf_grid[ii][jj].vsum; |
463 |
< |
bsdf_grid[i][j].nval += bsdf_grid[ii][jj].nval; |
462 |
> |
dsf_grid[i][j].vsum += dsf_grid[ii][jj].vsum; |
463 |
> |
dsf_grid[i][j].nval += dsf_grid[ii][jj].nval; |
464 |
|
/* keep value, though */ |
465 |
< |
bsdf_grid[ii][jj].vsum /= (double)bsdf_grid[ii][jj].nval; |
466 |
< |
bsdf_grid[ii][jj].nval = 0; |
465 |
> |
dsf_grid[ii][jj].vsum /= (float)dsf_grid[ii][jj].nval; |
466 |
> |
dsf_grid[ii][jj].nval = 0; |
467 |
|
} |
468 |
|
} |
469 |
|
} |
470 |
+ |
/* final averaging pass */ |
471 |
+ |
for (i = 0; i < GRIDRES; i++) |
472 |
+ |
for (j = 0; j < GRIDRES; j++) |
473 |
+ |
if (dsf_grid[i][j].nval > 1) { |
474 |
+ |
dsf_grid[i][j].vsum /= (float)dsf_grid[i][j].nval; |
475 |
+ |
dsf_grid[i][j].nval = 1; |
476 |
+ |
} |
477 |
|
} |
478 |
|
|
479 |
+ |
/* Compute (and allocate) migration price matrix for optimization */ |
480 |
+ |
static float * |
481 |
+ |
price_routes(const RBFNODE *from_rbf, const RBFNODE *to_rbf) |
482 |
+ |
{ |
483 |
+ |
float *pmtx = (float *)malloc(sizeof(float) * |
484 |
+ |
from_rbf->nrbf * to_rbf->nrbf); |
485 |
+ |
FVECT *vto = (FVECT *)malloc(sizeof(FVECT) * to_rbf->nrbf); |
486 |
+ |
int i, j; |
487 |
|
|
488 |
+ |
if ((pmtx == NULL) | (vto == NULL)) { |
489 |
+ |
fputs("Out of memory in migration_costs()\n", stderr); |
490 |
+ |
exit(1); |
491 |
+ |
} |
492 |
+ |
for (j = to_rbf->nrbf; j--; ) /* save repetitive ops. */ |
493 |
+ |
ovec_from_pos(vto[j], to_rbf->rbfa[j].gx, to_rbf->rbfa[j].gy); |
494 |
+ |
|
495 |
+ |
for (i = from_rbf->nrbf; i--; ) { |
496 |
+ |
const double from_ang = R2ANG(from_rbf->rbfa[i].crad); |
497 |
+ |
FVECT vfrom; |
498 |
+ |
ovec_from_pos(vfrom, from_rbf->rbfa[i].gx, from_rbf->rbfa[i].gy); |
499 |
+ |
for (j = to_rbf->nrbf; j--; ) |
500 |
+ |
pmtx[i*to_rbf->nrbf + j] = acos(DOT(vfrom, vto[j])) + |
501 |
+ |
fabs(R2ANG(to_rbf->rbfa[j].crad) - from_ang); |
502 |
+ |
} |
503 |
+ |
free(vto); |
504 |
+ |
return(pmtx); |
505 |
+ |
} |
506 |
+ |
|
507 |
+ |
/* Comparison routine needed for sorting price row */ |
508 |
+ |
static const float *price_arr; |
509 |
+ |
static int |
510 |
+ |
msrt_cmp(const void *p1, const void *p2) |
511 |
+ |
{ |
512 |
+ |
float c1 = price_arr[*(const int *)p1]; |
513 |
+ |
float c2 = price_arr[*(const int *)p2]; |
514 |
+ |
|
515 |
+ |
if (c1 > c2) return(1); |
516 |
+ |
if (c1 < c2) return(-1); |
517 |
+ |
return(0); |
518 |
+ |
} |
519 |
+ |
|
520 |
+ |
/* Compute minimum (optimistic) cost for moving the given source material */ |
521 |
+ |
static double |
522 |
+ |
min_cost(double amt2move, const double *avail, const float *price, int n) |
523 |
+ |
{ |
524 |
+ |
static int *price_sort = NULL; |
525 |
+ |
static int n_alloc = 0; |
526 |
+ |
double total_cost = 0; |
527 |
+ |
int i; |
528 |
+ |
|
529 |
+ |
if (amt2move <= FTINY) /* pre-emptive check */ |
530 |
+ |
return(0.); |
531 |
+ |
if (n > n_alloc) { /* (re)allocate sort array */ |
532 |
+ |
if (n_alloc) free(price_sort); |
533 |
+ |
price_sort = (int *)malloc(sizeof(int)*n); |
534 |
+ |
if (price_sort == NULL) { |
535 |
+ |
fputs("Out of memory in min_cost()\n", stderr); |
536 |
+ |
exit(1); |
537 |
+ |
} |
538 |
+ |
n_alloc = n; |
539 |
+ |
} |
540 |
+ |
for (i = n; i--; ) |
541 |
+ |
price_sort[i] = i; |
542 |
+ |
price_arr = price; |
543 |
+ |
qsort(price_sort, n, sizeof(int), &msrt_cmp); |
544 |
+ |
/* move cheapest first */ |
545 |
+ |
for (i = 0; i < n && amt2move > FTINY; i++) { |
546 |
+ |
int d = price_sort[i]; |
547 |
+ |
double amt = (amt2move < avail[d]) ? amt2move : avail[d]; |
548 |
+ |
|
549 |
+ |
total_cost += amt * price[d]; |
550 |
+ |
amt2move -= amt; |
551 |
+ |
} |
552 |
+ |
return(total_cost); |
553 |
+ |
} |
554 |
+ |
|
555 |
+ |
/* Take a step in migration by choosing optimal bucket to transfer */ |
556 |
+ |
static double |
557 |
+ |
migration_step(MIGRATION *mig, double *src_rem, double *dst_rem, const float *pmtx) |
558 |
+ |
{ |
559 |
+ |
static double *src_cost = NULL; |
560 |
+ |
int n_alloc = 0; |
561 |
+ |
const double maxamt = 2./(mtx_nrows(mig)*mtx_ncols(mig)); |
562 |
+ |
double amt = 0; |
563 |
+ |
struct { |
564 |
+ |
int s, d; /* source and destination */ |
565 |
+ |
double price; /* price estimate per amount moved */ |
566 |
+ |
double amt; /* amount we can move */ |
567 |
+ |
} cur, best; |
568 |
+ |
int i; |
569 |
+ |
|
570 |
+ |
if (mtx_nrows(mig) > n_alloc) { /* allocate cost array */ |
571 |
+ |
if (n_alloc) |
572 |
+ |
free(src_cost); |
573 |
+ |
src_cost = (double *)malloc(sizeof(double)*mtx_nrows(mig)); |
574 |
+ |
if (src_cost == NULL) { |
575 |
+ |
fputs("Out of memory in migration_step()\n", stderr); |
576 |
+ |
exit(1); |
577 |
+ |
} |
578 |
+ |
n_alloc = mtx_nrows(mig); |
579 |
+ |
} |
580 |
+ |
for (i = mtx_nrows(mig); i--; ) /* starting costs for diff. */ |
581 |
+ |
src_cost[i] = min_cost(src_rem[i], dst_rem, |
582 |
+ |
pmtx+i*mtx_ncols(mig), mtx_ncols(mig)); |
583 |
+ |
|
584 |
+ |
/* find best source & dest. */ |
585 |
+ |
best.s = best.d = -1; best.price = FHUGE; best.amt = 0; |
586 |
+ |
for (cur.s = mtx_nrows(mig); cur.s--; ) { |
587 |
+ |
const float *price = pmtx + cur.s*mtx_ncols(mig); |
588 |
+ |
double cost_others = 0; |
589 |
+ |
if (src_rem[cur.s] <= FTINY) |
590 |
+ |
continue; |
591 |
+ |
cur.d = -1; /* examine cheapest dest. */ |
592 |
+ |
for (i = mtx_ncols(mig); i--; ) |
593 |
+ |
if (dst_rem[i] > FTINY && |
594 |
+ |
(cur.d < 0 || price[i] < price[cur.d])) |
595 |
+ |
cur.d = i; |
596 |
+ |
if (cur.d < 0) |
597 |
+ |
return(.0); |
598 |
+ |
if ((cur.price = price[cur.d]) >= best.price) |
599 |
+ |
continue; /* no point checking further */ |
600 |
+ |
cur.amt = (src_rem[cur.s] < dst_rem[cur.d]) ? |
601 |
+ |
src_rem[cur.s] : dst_rem[cur.d]; |
602 |
+ |
if (cur.amt > maxamt) cur.amt = maxamt; |
603 |
+ |
dst_rem[cur.d] -= cur.amt; /* add up differential costs */ |
604 |
+ |
for (i = mtx_nrows(mig); i--; ) { |
605 |
+ |
if (i == cur.s) continue; |
606 |
+ |
cost_others += min_cost(src_rem[i], dst_rem, price, mtx_ncols(mig)) |
607 |
+ |
- src_cost[i]; |
608 |
+ |
} |
609 |
+ |
dst_rem[cur.d] += cur.amt; /* undo trial move */ |
610 |
+ |
cur.price += cost_others/cur.amt; /* adjust effective price */ |
611 |
+ |
if (cur.price < best.price) /* are we better than best? */ |
612 |
+ |
best = cur; |
613 |
+ |
} |
614 |
+ |
if ((best.s < 0) | (best.d < 0)) |
615 |
+ |
return(.0); |
616 |
+ |
/* make the actual move */ |
617 |
+ |
mig->mtx[mtx_ndx(mig,best.s,best.d)] += best.amt; |
618 |
+ |
src_rem[best.s] -= best.amt; |
619 |
+ |
dst_rem[best.d] -= best.amt; |
620 |
+ |
return(best.amt); |
621 |
+ |
} |
622 |
+ |
|
623 |
+ |
/* Compute (and insert) migration along directed edge */ |
624 |
+ |
static MIGRATION * |
625 |
+ |
make_migration(RBFNODE *from_rbf, RBFNODE *to_rbf) |
626 |
+ |
{ |
627 |
+ |
const double end_thresh = 0.02/(from_rbf->nrbf*to_rbf->nrbf); |
628 |
+ |
float *pmtx = price_routes(from_rbf, to_rbf); |
629 |
+ |
MIGRATION *newmig = (MIGRATION *)malloc(sizeof(MIGRATION) + |
630 |
+ |
sizeof(float) * |
631 |
+ |
(from_rbf->nrbf*to_rbf->nrbf - 1)); |
632 |
+ |
double *src_rem = (double *)malloc(sizeof(double)*from_rbf->nrbf); |
633 |
+ |
double *dst_rem = (double *)malloc(sizeof(double)*to_rbf->nrbf); |
634 |
+ |
double total_rem = 1.; |
635 |
+ |
int i; |
636 |
+ |
|
637 |
+ |
if ((newmig == NULL) | (src_rem == NULL) | (dst_rem == NULL)) { |
638 |
+ |
fputs("Out of memory in make_migration()\n", stderr); |
639 |
+ |
exit(1); |
640 |
+ |
} |
641 |
+ |
#ifdef DEBUG |
642 |
+ |
{ |
643 |
+ |
double theta, phi; |
644 |
+ |
theta = acos(from_rbf->invec[2])*(180./M_PI); |
645 |
+ |
phi = atan2(from_rbf->invec[1],from_rbf->invec[0])*(180./M_PI); |
646 |
+ |
fprintf(stderr, "Building path from (theta,phi) (%d,%d) to ", |
647 |
+ |
round(theta), round(phi)); |
648 |
+ |
theta = acos(to_rbf->invec[2])*(180./M_PI); |
649 |
+ |
phi = atan2(to_rbf->invec[1],to_rbf->invec[0])*(180./M_PI); |
650 |
+ |
fprintf(stderr, "(%d,%d)\n", round(theta), round(phi)); |
651 |
+ |
} |
652 |
+ |
#endif |
653 |
+ |
newmig->next = NULL; |
654 |
+ |
newmig->rbfv[0] = from_rbf; |
655 |
+ |
newmig->rbfv[1] = to_rbf; |
656 |
+ |
newmig->enxt[0] = newmig->enxt[1] = NULL; |
657 |
+ |
memset(newmig->mtx, 0, sizeof(float)*from_rbf->nrbf*to_rbf->nrbf); |
658 |
+ |
/* starting quantities */ |
659 |
+ |
for (i = from_rbf->nrbf; i--; ) |
660 |
+ |
src_rem[i] = rbf_volume(&from_rbf->rbfa[i]) / from_rbf->vtotal; |
661 |
+ |
for (i = to_rbf->nrbf; i--; ) |
662 |
+ |
dst_rem[i] = rbf_volume(&to_rbf->rbfa[i]) / to_rbf->vtotal; |
663 |
+ |
/* move a bit at a time */ |
664 |
+ |
while (total_rem > end_thresh) |
665 |
+ |
total_rem -= migration_step(newmig, src_rem, dst_rem, pmtx); |
666 |
+ |
|
667 |
+ |
free(pmtx); /* free working arrays */ |
668 |
+ |
free(src_rem); |
669 |
+ |
free(dst_rem); |
670 |
+ |
for (i = from_rbf->nrbf; i--; ) { /* normalize final matrix */ |
671 |
+ |
float nf = rbf_volume(&from_rbf->rbfa[i]); |
672 |
+ |
int j; |
673 |
+ |
if (nf <= FTINY) continue; |
674 |
+ |
nf = from_rbf->vtotal / nf; |
675 |
+ |
for (j = to_rbf->nrbf; j--; ) |
676 |
+ |
newmig->mtx[mtx_ndx(newmig,i,j)] *= nf; |
677 |
+ |
} |
678 |
+ |
/* insert in edge lists */ |
679 |
+ |
newmig->enxt[0] = from_rbf->ejl; |
680 |
+ |
from_rbf->ejl = newmig; |
681 |
+ |
newmig->enxt[1] = to_rbf->ejl; |
682 |
+ |
to_rbf->ejl = newmig; |
683 |
+ |
newmig->next = mig_list; |
684 |
+ |
return(mig_list = newmig); |
685 |
+ |
} |
686 |
+ |
|
687 |
+ |
/* Get triangle surface orientation (unnormalized) */ |
688 |
+ |
static void |
689 |
+ |
tri_orient(FVECT vres, const FVECT v1, const FVECT v2, const FVECT v3) |
690 |
+ |
{ |
691 |
+ |
FVECT v2minus1, v3minus2; |
692 |
+ |
|
693 |
+ |
VSUB(v2minus1, v2, v1); |
694 |
+ |
VSUB(v3minus2, v3, v2); |
695 |
+ |
VCROSS(vres, v2minus1, v3minus2); |
696 |
+ |
} |
697 |
+ |
|
698 |
+ |
/* Determine if vertex order is reversed (inward normal) */ |
699 |
+ |
static int |
700 |
+ |
is_rev_tri(const FVECT v1, const FVECT v2, const FVECT v3) |
701 |
+ |
{ |
702 |
+ |
FVECT tor; |
703 |
+ |
|
704 |
+ |
tri_orient(tor, v1, v2, v3); |
705 |
+ |
|
706 |
+ |
return(DOT(tor, v2) < 0.); |
707 |
+ |
} |
708 |
+ |
|
709 |
+ |
/* Find vertices completing triangles on either side of the given edge */ |
710 |
+ |
static int |
711 |
+ |
get_triangles(RBFNODE *rbfv[2], const MIGRATION *mig) |
712 |
+ |
{ |
713 |
+ |
const MIGRATION *ej, *ej2; |
714 |
+ |
RBFNODE *tv; |
715 |
+ |
|
716 |
+ |
rbfv[0] = rbfv[1] = NULL; |
717 |
+ |
for (ej = mig->rbfv[0]->ejl; ej != NULL; |
718 |
+ |
ej = nextedge(mig->rbfv[0],ej)) { |
719 |
+ |
if (ej == mig) |
720 |
+ |
continue; |
721 |
+ |
tv = opp_rbf(mig->rbfv[0],ej); |
722 |
+ |
for (ej2 = tv->ejl; ej2 != NULL; ej2 = nextedge(tv,ej2)) |
723 |
+ |
if (opp_rbf(tv,ej2) == mig->rbfv[1]) { |
724 |
+ |
rbfv[is_rev_tri(mig->rbfv[0]->invec, |
725 |
+ |
mig->rbfv[1]->invec, |
726 |
+ |
tv->invec)] = tv; |
727 |
+ |
break; |
728 |
+ |
} |
729 |
+ |
} |
730 |
+ |
return((rbfv[0] != NULL) + (rbfv[1] != NULL)); |
731 |
+ |
} |
732 |
+ |
|
733 |
+ |
/* Find context hull vertex to complete triangle (oriented call) */ |
734 |
+ |
static RBFNODE * |
735 |
+ |
find_chull_vert(const RBFNODE *rbf0, const RBFNODE *rbf1) |
736 |
+ |
{ |
737 |
+ |
FVECT vmid, vor; |
738 |
+ |
RBFNODE *rbf, *rbfbest = NULL; |
739 |
+ |
double dprod2, bestdprod2 = 0.5; |
740 |
+ |
|
741 |
+ |
VADD(vmid, rbf0->invec, rbf1->invec); |
742 |
+ |
if (normalize(vmid) == 0) |
743 |
+ |
return(NULL); |
744 |
+ |
/* XXX exhaustive search */ |
745 |
+ |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) { |
746 |
+ |
if ((rbf == rbf0) | (rbf == rbf1)) |
747 |
+ |
continue; |
748 |
+ |
tri_orient(vor, rbf0->invec, rbf1->invec, rbf->invec); |
749 |
+ |
dprod2 = DOT(vor, vmid); |
750 |
+ |
if (dprod2 <= FTINY) |
751 |
+ |
continue; /* wrong orientation */ |
752 |
+ |
dprod2 *= dprod2 / DOT(vor,vor); |
753 |
+ |
if (dprod2 > bestdprod2) { /* more convex than prev? */ |
754 |
+ |
rbfbest = rbf; |
755 |
+ |
bestdprod2 = dprod2; |
756 |
+ |
} |
757 |
+ |
} |
758 |
+ |
return(rbf); |
759 |
+ |
} |
760 |
+ |
|
761 |
+ |
/* Create new migration edge and grow mesh recursively around it */ |
762 |
+ |
static void |
763 |
+ |
mesh_from_edge(RBFNODE *rbf0, RBFNODE *rbf1) |
764 |
+ |
{ |
765 |
+ |
MIGRATION *newej; |
766 |
+ |
RBFNODE *tvert[2]; |
767 |
+ |
|
768 |
+ |
if (rbf0 < rbf1) /* avoid migration loops */ |
769 |
+ |
newej = make_migration(rbf0, rbf1); |
770 |
+ |
else |
771 |
+ |
newej = make_migration(rbf1, rbf0); |
772 |
+ |
/* triangle on either side? */ |
773 |
+ |
get_triangles(tvert, newej); |
774 |
+ |
if (tvert[0] == NULL) { /* recurse on new right edge */ |
775 |
+ |
tvert[0] = find_chull_vert(newej->rbfv[0], newej->rbfv[1]); |
776 |
+ |
if (tvert[0] != NULL) { |
777 |
+ |
mesh_from_edge(rbf0, tvert[0]); |
778 |
+ |
mesh_from_edge(rbf1, tvert[0]); |
779 |
+ |
} |
780 |
+ |
} |
781 |
+ |
if (tvert[1] == NULL) { /* recurse on new left edge */ |
782 |
+ |
tvert[1] = find_chull_vert(newej->rbfv[1], newej->rbfv[0]); |
783 |
+ |
if (tvert[1] != NULL) { |
784 |
+ |
mesh_from_edge(rbf0, tvert[1]); |
785 |
+ |
mesh_from_edge(rbf1, tvert[1]); |
786 |
+ |
} |
787 |
+ |
} |
788 |
+ |
} |
789 |
+ |
|
790 |
+ |
/* Draw edge list into mig_grid array */ |
791 |
+ |
static void |
792 |
+ |
draw_edges() |
793 |
+ |
{ |
794 |
+ |
int nnull = 0, ntot = 0; |
795 |
+ |
MIGRATION *ej; |
796 |
+ |
int p0[2], p1[2]; |
797 |
+ |
|
798 |
+ |
/* memset(mig_grid, 0, sizeof(mig_grid)); */ |
799 |
+ |
for (ej = mig_list; ej != NULL; ej = ej->next) { |
800 |
+ |
++ntot; |
801 |
+ |
pos_from_vec(p0, ej->rbfv[0]->invec); |
802 |
+ |
pos_from_vec(p1, ej->rbfv[1]->invec); |
803 |
+ |
if ((p0[0] == p1[0]) & (p0[1] == p1[1])) { |
804 |
+ |
++nnull; |
805 |
+ |
mig_grid[p0[0]][p0[1]] = ej; |
806 |
+ |
continue; |
807 |
+ |
} |
808 |
+ |
if (abs(p1[0]-p0[0]) > abs(p1[1]-p0[1])) { |
809 |
+ |
const int xstep = 2*(p1[0] > p0[0]) - 1; |
810 |
+ |
const double ystep = (double)((p1[1]-p0[1])*xstep) / |
811 |
+ |
(double)(p1[0]-p0[0]); |
812 |
+ |
int x; |
813 |
+ |
double y; |
814 |
+ |
for (x = p0[0], y = p0[1]+.5; x != p1[0]; |
815 |
+ |
x += xstep, y += ystep) |
816 |
+ |
mig_grid[x][(int)y] = ej; |
817 |
+ |
mig_grid[x][(int)y] = ej; |
818 |
+ |
} else { |
819 |
+ |
const int ystep = 2*(p1[1] > p0[1]) - 1; |
820 |
+ |
const double xstep = (double)((p1[0]-p0[0])*ystep) / |
821 |
+ |
(double)(p1[1]-p0[1]); |
822 |
+ |
int y; |
823 |
+ |
double x; |
824 |
+ |
for (y = p0[1], x = p0[0]+.5; y != p1[1]; |
825 |
+ |
y += ystep, x += xstep) |
826 |
+ |
mig_grid[(int)x][y] = ej; |
827 |
+ |
mig_grid[(int)x][y] = ej; |
828 |
+ |
} |
829 |
+ |
} |
830 |
+ |
if (nnull) |
831 |
+ |
fprintf(stderr, "Warning: %d of %d edges are null\n", |
832 |
+ |
nnull, ntot); |
833 |
+ |
} |
834 |
+ |
|
835 |
+ |
/* Build our triangle mesh from recorded RBFs */ |
836 |
+ |
static void |
837 |
+ |
build_mesh() |
838 |
+ |
{ |
839 |
+ |
double best2 = M_PI*M_PI; |
840 |
+ |
RBFNODE *rbf, *rbf_near = NULL; |
841 |
+ |
/* check if isotropic */ |
842 |
+ |
if (single_plane_incident) { |
843 |
+ |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) |
844 |
+ |
if (rbf->next != NULL) |
845 |
+ |
make_migration(rbf, rbf->next); |
846 |
+ |
return; |
847 |
+ |
} |
848 |
+ |
/* find RBF nearest to head */ |
849 |
+ |
if (dsf_list == NULL) |
850 |
+ |
return; |
851 |
+ |
for (rbf = dsf_list->next; rbf != NULL; rbf = rbf->next) { |
852 |
+ |
double dist2 = 2. - 2.*DOT(dsf_list->invec,rbf->invec); |
853 |
+ |
if (dist2 < best2) { |
854 |
+ |
rbf_near = rbf; |
855 |
+ |
best2 = dist2; |
856 |
+ |
} |
857 |
+ |
} |
858 |
+ |
if (rbf_near == NULL) { |
859 |
+ |
fputs("Cannot find nearest point for first edge\n", stderr); |
860 |
+ |
exit(1); |
861 |
+ |
} |
862 |
+ |
/* build mesh from this edge */ |
863 |
+ |
mesh_from_edge(dsf_list, rbf_near); |
864 |
+ |
/* draw edge list into grid */ |
865 |
+ |
draw_edges(); |
866 |
+ |
} |
867 |
+ |
|
868 |
+ |
/* Identify enclosing triangle for this position (flood fill raster check) */ |
869 |
+ |
static int |
870 |
+ |
identify_tri(MIGRATION *miga[3], unsigned char vmap[GRIDRES][(GRIDRES+7)/8], |
871 |
+ |
int px, int py) |
872 |
+ |
{ |
873 |
+ |
const int btest = 1<<(py&07); |
874 |
+ |
|
875 |
+ |
if (vmap[px][py>>3] & btest) /* already visited here? */ |
876 |
+ |
return(1); |
877 |
+ |
/* else mark it */ |
878 |
+ |
vmap[px][py>>3] |= btest; |
879 |
+ |
|
880 |
+ |
if (mig_grid[px][py] != NULL) { /* are we on an edge? */ |
881 |
+ |
int i; |
882 |
+ |
for (i = 0; i < 3; i++) { |
883 |
+ |
if (miga[i] == mig_grid[px][py]) |
884 |
+ |
return(1); |
885 |
+ |
if (miga[i] != NULL) |
886 |
+ |
continue; |
887 |
+ |
miga[i] = mig_grid[px][py]; |
888 |
+ |
return(1); |
889 |
+ |
} |
890 |
+ |
return(0); /* outside triangle! */ |
891 |
+ |
} |
892 |
+ |
/* check neighbors (flood) */ |
893 |
+ |
if (px > 0 && !identify_tri(miga, vmap, px-1, py)) |
894 |
+ |
return(0); |
895 |
+ |
if (px < GRIDRES-1 && !identify_tri(miga, vmap, px+1, py)) |
896 |
+ |
return(0); |
897 |
+ |
if (py > 0 && !identify_tri(miga, vmap, px, py-1)) |
898 |
+ |
return(0); |
899 |
+ |
if (py < GRIDRES-1 && !identify_tri(miga, vmap, px, py+1)) |
900 |
+ |
return(0); |
901 |
+ |
return(1); /* this neighborhood done */ |
902 |
+ |
} |
903 |
+ |
|
904 |
+ |
/* Find edge(s) for interpolating the given incident vector */ |
905 |
+ |
static int |
906 |
+ |
get_interp(MIGRATION *miga[3], const FVECT invec) |
907 |
+ |
{ |
908 |
+ |
miga[0] = miga[1] = miga[2] = NULL; |
909 |
+ |
if (single_plane_incident) { /* isotropic BSDF? */ |
910 |
+ |
RBFNODE *rbf; /* find edge we're on */ |
911 |
+ |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) { |
912 |
+ |
if (input_orient*rbf->invec[2] < input_orient*invec[2]) |
913 |
+ |
break; |
914 |
+ |
if (rbf->next != NULL && |
915 |
+ |
input_orient*rbf->next->invec[2] < |
916 |
+ |
input_orient*invec[2]) { |
917 |
+ |
for (miga[0] = rbf->ejl; miga[0] != NULL; |
918 |
+ |
miga[0] = nextedge(rbf,miga[0])) |
919 |
+ |
if (opp_rbf(rbf,miga[0]) == rbf->next) |
920 |
+ |
return(1); |
921 |
+ |
break; |
922 |
+ |
} |
923 |
+ |
} |
924 |
+ |
return(0); /* outside range! */ |
925 |
+ |
} |
926 |
+ |
{ /* else use triangle mesh */ |
927 |
+ |
unsigned char floodmap[GRIDRES][(GRIDRES+7)/8]; |
928 |
+ |
int pstart[2]; |
929 |
+ |
|
930 |
+ |
pos_from_vec(pstart, invec); |
931 |
+ |
memset(floodmap, 0, sizeof(floodmap)); |
932 |
+ |
/* call flooding function */ |
933 |
+ |
if (!identify_tri(miga, floodmap, pstart[0], pstart[1])) |
934 |
+ |
return(0); /* outside mesh */ |
935 |
+ |
if ((miga[0] == NULL) | (miga[2] == NULL)) |
936 |
+ |
return(0); /* should never happen */ |
937 |
+ |
if (miga[1] == NULL) |
938 |
+ |
return(1); /* on edge */ |
939 |
+ |
return(3); /* else in triangle */ |
940 |
+ |
} |
941 |
+ |
} |
942 |
+ |
|
943 |
+ |
/* Advect and allocate new RBF along edge */ |
944 |
+ |
static RBFNODE * |
945 |
+ |
e_advect_rbf(const MIGRATION *mig, const FVECT invec) |
946 |
+ |
{ |
947 |
+ |
RBFNODE *rbf; |
948 |
+ |
int n, i, j; |
949 |
+ |
double t, full_dist; |
950 |
+ |
/* get relative position */ |
951 |
+ |
t = acos(DOT(invec, mig->rbfv[0]->invec)); |
952 |
+ |
if (t < M_PI/GRIDRES) { /* near first DSF */ |
953 |
+ |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1); |
954 |
+ |
rbf = (RBFNODE *)malloc(n); |
955 |
+ |
if (rbf == NULL) |
956 |
+ |
goto memerr; |
957 |
+ |
memcpy(rbf, mig->rbfv[0], n); /* just duplicate */ |
958 |
+ |
return(rbf); |
959 |
+ |
} |
960 |
+ |
full_dist = acos(DOT(mig->rbfv[0]->invec, mig->rbfv[1]->invec)); |
961 |
+ |
if (t > full_dist-M_PI/GRIDRES) { /* near second DSF */ |
962 |
+ |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[1]->nrbf-1); |
963 |
+ |
rbf = (RBFNODE *)malloc(n); |
964 |
+ |
if (rbf == NULL) |
965 |
+ |
goto memerr; |
966 |
+ |
memcpy(rbf, mig->rbfv[1], n); /* just duplicate */ |
967 |
+ |
return(rbf); |
968 |
+ |
} |
969 |
+ |
t /= full_dist; |
970 |
+ |
n = 0; /* count migrating particles */ |
971 |
+ |
for (i = 0; i < mtx_nrows(mig); i++) |
972 |
+ |
for (j = 0; j < mtx_ncols(mig); j++) |
973 |
+ |
n += (mig->mtx[mtx_ndx(mig,i,j)] > FTINY); |
974 |
+ |
#ifdef DEBUG |
975 |
+ |
fprintf(stderr, "Input RBFs have %d, %d nodes -> output has %d\n", |
976 |
+ |
mig->rbfv[0]->nrbf, mig->rbfv[1]->nrbf, n); |
977 |
+ |
#endif |
978 |
+ |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
979 |
+ |
if (rbf == NULL) |
980 |
+ |
goto memerr; |
981 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
982 |
+ |
VCOPY(rbf->invec, invec); |
983 |
+ |
rbf->nrbf = n; |
984 |
+ |
rbf->vtotal = 1.-t + t*mig->rbfv[1]->vtotal/mig->rbfv[0]->vtotal; |
985 |
+ |
n = 0; /* advect RBF lobes */ |
986 |
+ |
for (i = 0; i < mtx_nrows(mig); i++) { |
987 |
+ |
const RBFVAL *rbf0i = &mig->rbfv[0]->rbfa[i]; |
988 |
+ |
const float peak0 = rbf0i->peak; |
989 |
+ |
const double rad0 = R2ANG(rbf0i->crad); |
990 |
+ |
FVECT v0; |
991 |
+ |
float mv; |
992 |
+ |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
993 |
+ |
for (j = 0; j < mtx_ncols(mig); j++) |
994 |
+ |
if ((mv = mig->mtx[mtx_ndx(mig,i,j)]) > FTINY) { |
995 |
+ |
const RBFVAL *rbf1j = &mig->rbfv[1]->rbfa[j]; |
996 |
+ |
double rad1 = R2ANG(rbf1j->crad); |
997 |
+ |
FVECT v; |
998 |
+ |
int pos[2]; |
999 |
+ |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal; |
1000 |
+ |
rbf->rbfa[n].crad = ANG2R(sqrt(rad0*rad0*(1.-t) + |
1001 |
+ |
rad1*rad1*t)); |
1002 |
+ |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy); |
1003 |
+ |
geodesic(v, v0, v, t, GEOD_REL); |
1004 |
+ |
pos_from_vec(pos, v); |
1005 |
+ |
rbf->rbfa[n].gx = pos[0]; |
1006 |
+ |
rbf->rbfa[n].gy = pos[1]; |
1007 |
+ |
++n; |
1008 |
+ |
} |
1009 |
+ |
} |
1010 |
+ |
rbf->vtotal *= mig->rbfv[0]->vtotal; /* turn ratio into actual */ |
1011 |
+ |
return(rbf); |
1012 |
+ |
memerr: |
1013 |
+ |
fputs("Out of memory in e_advect_rbf()\n", stderr); |
1014 |
+ |
exit(1); |
1015 |
+ |
return(NULL); /* pro forma return */ |
1016 |
+ |
} |
1017 |
+ |
|
1018 |
+ |
/* Insert vertex in ordered list */ |
1019 |
+ |
static void |
1020 |
+ |
insert_vert(RBFNODE **vlist, RBFNODE *v) |
1021 |
+ |
{ |
1022 |
+ |
int i, j; |
1023 |
+ |
|
1024 |
+ |
for (i = 0; vlist[i] != NULL; i++) { |
1025 |
+ |
if (v == vlist[i]) |
1026 |
+ |
return; |
1027 |
+ |
if (v < vlist[i]) |
1028 |
+ |
break; |
1029 |
+ |
} |
1030 |
+ |
for (j = i; vlist[j] != NULL; j++) |
1031 |
+ |
; |
1032 |
+ |
while (j > i) { |
1033 |
+ |
vlist[j] = vlist[j-1]; |
1034 |
+ |
--j; |
1035 |
+ |
} |
1036 |
+ |
vlist[i] = v; |
1037 |
+ |
} |
1038 |
+ |
|
1039 |
+ |
/* Sort triangle edges in standard order */ |
1040 |
+ |
static void |
1041 |
+ |
order_triangle(MIGRATION *miga[3]) |
1042 |
+ |
{ |
1043 |
+ |
RBFNODE *vert[4]; |
1044 |
+ |
MIGRATION *ord[3]; |
1045 |
+ |
int i; |
1046 |
+ |
/* order vertices, first */ |
1047 |
+ |
memset(vert, 0, sizeof(vert)); |
1048 |
+ |
for (i = 0; i < 3; i++) { |
1049 |
+ |
insert_vert(vert, miga[i]->rbfv[0]); |
1050 |
+ |
insert_vert(vert, miga[i]->rbfv[1]); |
1051 |
+ |
} |
1052 |
+ |
/* identify edge 0 */ |
1053 |
+ |
for (i = 0; i < 3; i++) |
1054 |
+ |
if (miga[i]->rbfv[0] == vert[0] && |
1055 |
+ |
miga[i]->rbfv[1] == vert[1]) { |
1056 |
+ |
ord[0] = miga[i]; |
1057 |
+ |
break; |
1058 |
+ |
} |
1059 |
+ |
/* identify edge 1 */ |
1060 |
+ |
for (i = 0; i < 3; i++) |
1061 |
+ |
if (miga[i]->rbfv[0] == vert[1] && |
1062 |
+ |
miga[i]->rbfv[1] == vert[2]) { |
1063 |
+ |
ord[1] = miga[i]; |
1064 |
+ |
break; |
1065 |
+ |
} |
1066 |
+ |
/* identify edge 2 */ |
1067 |
+ |
for (i = 0; i < 3; i++) |
1068 |
+ |
if (miga[i]->rbfv[0] == vert[0] && |
1069 |
+ |
miga[i]->rbfv[1] == vert[2]) { |
1070 |
+ |
ord[2] = miga[i]; |
1071 |
+ |
break; |
1072 |
+ |
} |
1073 |
+ |
miga[0] = ord[0]; miga[1] = ord[1]; miga[2] = ord[2]; |
1074 |
+ |
} |
1075 |
+ |
|
1076 |
+ |
/* Partially advect between recorded incident angles and allocate new RBF */ |
1077 |
+ |
static RBFNODE * |
1078 |
+ |
advect_rbf(const FVECT invec) |
1079 |
+ |
{ |
1080 |
+ |
MIGRATION *miga[3]; |
1081 |
+ |
RBFNODE *rbf; |
1082 |
+ |
float mbfact, mcfact; |
1083 |
+ |
int n, i, j, k; |
1084 |
+ |
FVECT v0, v1, v2; |
1085 |
+ |
double s, t; |
1086 |
+ |
|
1087 |
+ |
if (!get_interp(miga, invec)) /* can't interpolate? */ |
1088 |
+ |
return(NULL); |
1089 |
+ |
if (miga[1] == NULL) /* along edge? */ |
1090 |
+ |
return(e_advect_rbf(miga[0], invec)); |
1091 |
+ |
/* put in standard order */ |
1092 |
+ |
order_triangle(miga); |
1093 |
+ |
#ifdef DEBUG |
1094 |
+ |
if (miga[0]->rbfv[0] != miga[2]->rbfv[0] | |
1095 |
+ |
miga[0]->rbfv[1] != miga[1]->rbfv[0] | |
1096 |
+ |
miga[1]->rbfv[1] != miga[2]->rbfv[1]) { |
1097 |
+ |
fputs("Triangle vertex screw-up!\n", stderr); |
1098 |
+ |
exit(1); |
1099 |
+ |
} |
1100 |
+ |
#endif |
1101 |
+ |
/* figure out position */ |
1102 |
+ |
fcross(v0, miga[2]->rbfv[0]->invec, miga[2]->rbfv[1]->invec); |
1103 |
+ |
normalize(v0); |
1104 |
+ |
fcross(v2, miga[1]->rbfv[0]->invec, miga[1]->rbfv[1]->invec); |
1105 |
+ |
normalize(v2); |
1106 |
+ |
fcross(v1, invec, miga[1]->rbfv[1]->invec); |
1107 |
+ |
normalize(v1); |
1108 |
+ |
s = acos(DOT(v0,v1)) / acos(DOT(v0,v2)); |
1109 |
+ |
geodesic(v1, miga[0]->rbfv[0]->invec, miga[0]->rbfv[1]->invec, |
1110 |
+ |
s, GEOD_REL); |
1111 |
+ |
t = acos(DOT(v1,invec)) / acos(DOT(v1,miga[1]->rbfv[1]->invec)); |
1112 |
+ |
n = 0; /* count migrating particles */ |
1113 |
+ |
for (i = 0; i < mtx_nrows(miga[0]); i++) |
1114 |
+ |
for (j = 0; j < mtx_ncols(miga[0]); j++) |
1115 |
+ |
for (k = (miga[0]->mtx[mtx_ndx(miga[0],i,j)] > FTINY) * |
1116 |
+ |
mtx_ncols(miga[2]); k--; ) |
1117 |
+ |
n += (miga[2]->mtx[mtx_ndx(miga[2],i,k)] > FTINY && |
1118 |
+ |
miga[1]->mtx[mtx_ndx(miga[1],j,k)] > FTINY); |
1119 |
+ |
#ifdef DEBUG |
1120 |
+ |
fprintf(stderr, "Input RBFs have %d, %d, %d nodes -> output has %d\n", |
1121 |
+ |
miga[0]->rbfv[0]->nrbf, miga[0]->rbfv[1]->nrbf, |
1122 |
+ |
miga[2]->rbfv[1]->nrbf, n); |
1123 |
+ |
#endif |
1124 |
+ |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
1125 |
+ |
if (rbf == NULL) { |
1126 |
+ |
fputs("Out of memory in advect_rbf()\n", stderr); |
1127 |
+ |
exit(1); |
1128 |
+ |
} |
1129 |
+ |
rbf->next = NULL; rbf->ejl = NULL; |
1130 |
+ |
VCOPY(rbf->invec, invec); |
1131 |
+ |
rbf->nrbf = n; |
1132 |
+ |
n = 0; /* compute RBF lobes */ |
1133 |
+ |
mbfact = s * miga[0]->rbfv[1]->vtotal/miga[0]->rbfv[0]->vtotal * |
1134 |
+ |
(1.-t + t*miga[1]->rbfv[1]->vtotal/miga[1]->rbfv[0]->vtotal); |
1135 |
+ |
mcfact = (1.-s) * |
1136 |
+ |
(1.-t + t*miga[2]->rbfv[1]->vtotal/miga[2]->rbfv[0]->vtotal); |
1137 |
+ |
for (i = 0; i < mtx_nrows(miga[0]); i++) { |
1138 |
+ |
const RBFVAL *rbf0i = &miga[0]->rbfv[0]->rbfa[i]; |
1139 |
+ |
const float w0i = rbf0i->peak; |
1140 |
+ |
const double rad0i = R2ANG(rbf0i->crad); |
1141 |
+ |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
1142 |
+ |
for (j = 0; j < mtx_ncols(miga[0]); j++) { |
1143 |
+ |
const float ma = miga[0]->mtx[mtx_ndx(miga[0],i,j)]; |
1144 |
+ |
const RBFVAL *rbf1j; |
1145 |
+ |
double rad1j, srad2; |
1146 |
+ |
if (ma <= FTINY) |
1147 |
+ |
continue; |
1148 |
+ |
rbf1j = &miga[0]->rbfv[1]->rbfa[j]; |
1149 |
+ |
rad1j = R2ANG(rbf1j->crad); |
1150 |
+ |
srad2 = (1.-s)*(1.-t)*rad0i*rad0i + s*(1.-t)*rad1j*rad1j; |
1151 |
+ |
ovec_from_pos(v1, rbf1j->gx, rbf1j->gy); |
1152 |
+ |
geodesic(v1, v0, v1, s, GEOD_REL); |
1153 |
+ |
for (k = 0; k < mtx_ncols(miga[2]); k++) { |
1154 |
+ |
float mb = miga[1]->mtx[mtx_ndx(miga[1],j,k)]; |
1155 |
+ |
float mc = miga[2]->mtx[mtx_ndx(miga[2],i,k)]; |
1156 |
+ |
const RBFVAL *rbf2k; |
1157 |
+ |
double rad2k; |
1158 |
+ |
FVECT vout; |
1159 |
+ |
int pos[2]; |
1160 |
+ |
if ((mb <= FTINY) | (mc <= FTINY)) |
1161 |
+ |
continue; |
1162 |
+ |
rbf2k = &miga[2]->rbfv[1]->rbfa[k]; |
1163 |
+ |
rbf->rbfa[n].peak = w0i * ma * (mb*mbfact + mc*mcfact); |
1164 |
+ |
rad2k = R2ANG(rbf2k->crad); |
1165 |
+ |
rbf->rbfa[n].crad = ANG2R(sqrt(srad2 + t*rad2k*rad2k)); |
1166 |
+ |
ovec_from_pos(v2, rbf2k->gx, rbf2k->gy); |
1167 |
+ |
geodesic(vout, v1, v2, t, GEOD_REL); |
1168 |
+ |
pos_from_vec(pos, vout); |
1169 |
+ |
rbf->rbfa[n].gx = pos[0]; |
1170 |
+ |
rbf->rbfa[n].gy = pos[1]; |
1171 |
+ |
++n; |
1172 |
+ |
} |
1173 |
+ |
} |
1174 |
+ |
} |
1175 |
+ |
rbf->vtotal = miga[0]->rbfv[0]->vtotal * (mbfact + mcfact); |
1176 |
+ |
return(rbf); |
1177 |
+ |
} |
1178 |
+ |
|
1179 |
+ |
/* Interpolate and output isotropic BSDF data */ |
1180 |
+ |
static void |
1181 |
+ |
interp_isotropic() |
1182 |
+ |
{ |
1183 |
+ |
const int sqres = 1<<samp_order; |
1184 |
+ |
FILE *ofp = NULL; |
1185 |
+ |
char cmd[128]; |
1186 |
+ |
int ix, ox, oy; |
1187 |
+ |
FVECT ivec, ovec; |
1188 |
+ |
double bsdf; |
1189 |
+ |
|
1190 |
+ |
if (pctcull >= 0) { /* begin output */ |
1191 |
+ |
sprintf(cmd, "rttree_reduce -h -a -fd -r 3 -t %d -g %d", |
1192 |
+ |
pctcull, samp_order); |
1193 |
+ |
fflush(stdout); |
1194 |
+ |
ofp = popen(cmd, "w"); |
1195 |
+ |
if (ofp == NULL) { |
1196 |
+ |
fputs("Cannot create pipe for rttree_reduce\n", stderr); |
1197 |
+ |
exit(1); |
1198 |
+ |
} |
1199 |
+ |
} else |
1200 |
+ |
fputs("{\n", stdout); |
1201 |
+ |
/* run through directions */ |
1202 |
+ |
for (ix = 0; ix < sqres/2; ix++) { |
1203 |
+ |
RBFNODE *rbf; |
1204 |
+ |
SDsquare2disk(ivec, (ix+.5)/sqres, .5); |
1205 |
+ |
ivec[2] = input_orient * |
1206 |
+ |
sqrt(1. - ivec[0]*ivec[0] - ivec[1]*ivec[1]); |
1207 |
+ |
rbf = advect_rbf(ivec); |
1208 |
+ |
for (ox = 0; ox < sqres; ox++) |
1209 |
+ |
for (oy = 0; oy < sqres; oy++) { |
1210 |
+ |
SDsquare2disk(ovec, (ox+.5)/sqres, (oy+.5)/sqres); |
1211 |
+ |
ovec[2] = output_orient * |
1212 |
+ |
sqrt(1. - ovec[0]*ovec[0] - ovec[1]*ovec[1]); |
1213 |
+ |
bsdf = eval_rbfrep(rbf, ovec) / fabs(ovec[2]); |
1214 |
+ |
if (pctcull >= 0) |
1215 |
+ |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
1216 |
+ |
else |
1217 |
+ |
printf("\t%.3e\n", bsdf); |
1218 |
+ |
} |
1219 |
+ |
free(rbf); |
1220 |
+ |
} |
1221 |
+ |
if (pctcull >= 0) { /* finish output */ |
1222 |
+ |
if (pclose(ofp)) { |
1223 |
+ |
fprintf(stderr, "Error running '%s'\n", cmd); |
1224 |
+ |
exit(1); |
1225 |
+ |
} |
1226 |
+ |
} else { |
1227 |
+ |
for (ix = sqres*sqres*sqres/2; ix--; ) |
1228 |
+ |
fputs("\t0\n", stdout); |
1229 |
+ |
fputs("}\n", stdout); |
1230 |
+ |
} |
1231 |
+ |
} |
1232 |
+ |
|
1233 |
+ |
/* Interpolate and output anisotropic BSDF data */ |
1234 |
+ |
static void |
1235 |
+ |
interp_anisotropic() |
1236 |
+ |
{ |
1237 |
+ |
const int sqres = 1<<samp_order; |
1238 |
+ |
FILE *ofp = NULL; |
1239 |
+ |
char cmd[128]; |
1240 |
+ |
int ix, iy, ox, oy; |
1241 |
+ |
FVECT ivec, ovec; |
1242 |
+ |
double bsdf; |
1243 |
+ |
|
1244 |
+ |
if (pctcull >= 0) { /* begin output */ |
1245 |
+ |
sprintf(cmd, "rttree_reduce -h -a -fd -r 4 -t %d -g %d", |
1246 |
+ |
pctcull, samp_order); |
1247 |
+ |
fflush(stdout); |
1248 |
+ |
ofp = popen(cmd, "w"); |
1249 |
+ |
if (ofp == NULL) { |
1250 |
+ |
fputs("Cannot create pipe for rttree_reduce\n", stderr); |
1251 |
+ |
exit(1); |
1252 |
+ |
} |
1253 |
+ |
} else |
1254 |
+ |
fputs("{\n", stdout); |
1255 |
+ |
/* run through directions */ |
1256 |
+ |
for (ix = 0; ix < sqres; ix++) |
1257 |
+ |
for (iy = 0; iy < sqres; iy++) { |
1258 |
+ |
RBFNODE *rbf; |
1259 |
+ |
SDsquare2disk(ivec, (ix+.5)/sqres, (iy+.5)/sqres); |
1260 |
+ |
ivec[2] = input_orient * |
1261 |
+ |
sqrt(1. - ivec[0]*ivec[0] - ivec[1]*ivec[1]); |
1262 |
+ |
rbf = advect_rbf(ivec); |
1263 |
+ |
for (ox = 0; ox < sqres; ox++) |
1264 |
+ |
for (oy = 0; oy < sqres; oy++) { |
1265 |
+ |
SDsquare2disk(ovec, (ox+.5)/sqres, (oy+.5)/sqres); |
1266 |
+ |
ovec[2] = output_orient * |
1267 |
+ |
sqrt(1. - ovec[0]*ovec[0] - ovec[1]*ovec[1]); |
1268 |
+ |
bsdf = eval_rbfrep(rbf, ovec) / fabs(ovec[2]); |
1269 |
+ |
if (pctcull >= 0) |
1270 |
+ |
fwrite(&bsdf, sizeof(bsdf), 1, ofp); |
1271 |
+ |
else |
1272 |
+ |
printf("\t%.3e\n", bsdf); |
1273 |
+ |
} |
1274 |
+ |
free(rbf); |
1275 |
+ |
} |
1276 |
+ |
if (pctcull >= 0) { /* finish output */ |
1277 |
+ |
if (pclose(ofp)) { |
1278 |
+ |
fprintf(stderr, "Error running '%s'\n", cmd); |
1279 |
+ |
exit(1); |
1280 |
+ |
} |
1281 |
+ |
} else |
1282 |
+ |
fputs("}\n", stdout); |
1283 |
+ |
} |
1284 |
+ |
|
1285 |
|
#if 1 |
1286 |
+ |
/* Read in BSDF files and interpolate as tensor tree representation */ |
1287 |
+ |
int |
1288 |
+ |
main(int argc, char *argv[]) |
1289 |
+ |
{ |
1290 |
+ |
RBFNODE *rbf; |
1291 |
+ |
double bsdf; |
1292 |
+ |
int i; |
1293 |
+ |
|
1294 |
+ |
progname = argv[0]; |
1295 |
+ |
if (argc > 2 && !strcmp(argv[1], "-t")) { |
1296 |
+ |
pctcull = atoi(argv[2]); |
1297 |
+ |
argv += 2; argc -= 2; |
1298 |
+ |
} |
1299 |
+ |
if (argc < 3) { |
1300 |
+ |
fprintf(stderr, |
1301 |
+ |
"Usage: %s [-t pctcull] meas1.dat meas2.dat .. > bsdf.xml\n", |
1302 |
+ |
progname); |
1303 |
+ |
return(1); |
1304 |
+ |
} |
1305 |
+ |
for (i = 1; i < argc; i++) { /* compile measurements */ |
1306 |
+ |
if (!load_pabopto_meas(argv[i])) |
1307 |
+ |
return(1); |
1308 |
+ |
compute_radii(); |
1309 |
+ |
cull_values(); |
1310 |
+ |
make_rbfrep(); |
1311 |
+ |
} |
1312 |
+ |
build_mesh(); /* create interpolation */ |
1313 |
+ |
/* xml_prologue(); /* start XML output */ |
1314 |
+ |
if (single_plane_incident) /* resample dist. */ |
1315 |
+ |
interp_isotropic(); |
1316 |
+ |
else |
1317 |
+ |
interp_anisotropic(); |
1318 |
+ |
/* xml_epilogue(); /* finish XML output */ |
1319 |
+ |
return(0); |
1320 |
+ |
} |
1321 |
+ |
#else |
1322 |
|
/* Test main produces a Radiance model from the given input file */ |
1323 |
|
int |
1324 |
|
main(int argc, char *argv[]) |
1333 |
|
fprintf(stderr, "Usage: %s input.dat > output.rad\n", argv[0]); |
1334 |
|
return(1); |
1335 |
|
} |
1336 |
< |
if (!load_bsdf_meas(argv[1])) |
1336 |
> |
if (!load_pabopto_meas(argv[1])) |
1337 |
|
return(1); |
1338 |
|
|
1339 |
|
compute_radii(); |
1345 |
|
n = 0; |
1346 |
|
for (i = 0; i < GRIDRES; i++) |
1347 |
|
for (j = 0; j < GRIDRES; j++) |
1348 |
< |
if (bsdf_grid[i][j].vsum > .0f) { |
1349 |
< |
bsdf = bsdf_grid[i][j].vsum; |
1350 |
< |
vec_from_pos(dir, i, j); |
1351 |
< |
if (bsdf_grid[i][j].nval) { |
1348 |
> |
if (dsf_grid[i][j].vsum > .0f) { |
1349 |
> |
ovec_from_pos(dir, i, j); |
1350 |
> |
bsdf = dsf_grid[i][j].vsum / dir[2]; |
1351 |
> |
if (dsf_grid[i][j].nval) { |
1352 |
|
printf("pink cone c%04d\n0\n0\n8\n", ++n); |
1353 |
|
printf("\t%.6g %.6g %.6g\n", |
1354 |
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
1357 |
|
dir[2]*(bsdf+.005)); |
1358 |
|
puts("\t.003\t0\n"); |
1359 |
|
} else { |
1360 |
< |
vec_from_pos(dir, i, j); |
1360 |
> |
ovec_from_pos(dir, i, j); |
1361 |
|
printf("yellow sphere s%04d\n0\n0\n", ++n); |
1362 |
|
printf("4 %.6g %.6g %.6g .0015\n\n", |
1363 |
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
1366 |
|
/* output continuous surface */ |
1367 |
|
puts("void trans tgreen\n0\n0\n7 .7 1 .7 .04 .04 .9 .9\n"); |
1368 |
|
fflush(stdout); |
1369 |
< |
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES, GRIDRES); |
1369 |
> |
sprintf(buf, "gensurf tgreen bsdf - - - %d %d", GRIDRES-1, GRIDRES-1); |
1370 |
|
pfp = popen(buf, "w"); |
1371 |
|
if (pfp == NULL) { |
1372 |
|
fputs(buf, stderr); |
1375 |
|
} |
1376 |
|
for (i = 0; i < GRIDRES; i++) |
1377 |
|
for (j = 0; j < GRIDRES; j++) { |
1378 |
< |
vec_from_pos(dir, i, j); |
1379 |
< |
bsdf = eval_rbfrep(bsdf_list, dir); |
1378 |
> |
ovec_from_pos(dir, i, j); |
1379 |
> |
bsdf = eval_rbfrep(dsf_list, dir) / dir[2]; |
1380 |
|
fprintf(pfp, "%.8e %.8e %.8e\n", |
1381 |
|
dir[0]*bsdf, dir[1]*bsdf, dir[2]*bsdf); |
1382 |
|
} |