1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: bsdfmesh.c,v 2.14 2013/11/08 03:42:13 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Create BSDF advection mesh from radial basis functions. |
6 |
* |
7 |
* G. Ward |
8 |
*/ |
9 |
|
10 |
#ifndef _WIN32 |
11 |
#include <unistd.h> |
12 |
#include <sys/wait.h> |
13 |
#include <sys/mman.h> |
14 |
#endif |
15 |
#define _USE_MATH_DEFINES |
16 |
#include <stdio.h> |
17 |
#include <stdlib.h> |
18 |
#include <string.h> |
19 |
#include <math.h> |
20 |
#include "bsdfrep.h" |
21 |
/* number of processes to run */ |
22 |
int nprocs = 1; |
23 |
/* number of children (-1 in child) */ |
24 |
static int nchild = 0; |
25 |
|
26 |
typedef struct { |
27 |
int nrows, ncols; /* array size (matches migration) */ |
28 |
float *price; /* migration prices */ |
29 |
short *sord; /* sort for each row, low to high */ |
30 |
float *prow; /* current price row */ |
31 |
} PRICEMAT; /* sorted pricing matrix */ |
32 |
|
33 |
#define pricerow(p,i) ((p)->price + (i)*(p)->ncols) |
34 |
#define psortrow(p,i) ((p)->sord + (i)*(p)->ncols) |
35 |
|
36 |
/* Create a new migration holder (sharing memory for multiprocessing) */ |
37 |
static MIGRATION * |
38 |
new_migration(RBFNODE *from_rbf, RBFNODE *to_rbf) |
39 |
{ |
40 |
size_t memlen = sizeof(MIGRATION) + |
41 |
sizeof(float)*(from_rbf->nrbf*to_rbf->nrbf - 1); |
42 |
MIGRATION *newmig; |
43 |
#ifdef _WIN32 |
44 |
if (nprocs > 1) |
45 |
fprintf(stderr, "%s: warning - multiprocessing not supported\n", |
46 |
progname); |
47 |
nprocs = 1; |
48 |
newmig = (MIGRATION *)malloc(memlen); |
49 |
#else |
50 |
if (nprocs <= 1) { /* single process? */ |
51 |
newmig = (MIGRATION *)malloc(memlen); |
52 |
} else { /* else need to share memory */ |
53 |
newmig = (MIGRATION *)mmap(NULL, memlen, PROT_READ|PROT_WRITE, |
54 |
MAP_ANON|MAP_SHARED, -1, 0); |
55 |
if ((void *)newmig == MAP_FAILED) |
56 |
newmig = NULL; |
57 |
} |
58 |
#endif |
59 |
if (newmig == NULL) { |
60 |
fprintf(stderr, "%s: cannot allocate new migration\n", progname); |
61 |
exit(1); |
62 |
} |
63 |
newmig->rbfv[0] = from_rbf; |
64 |
newmig->rbfv[1] = to_rbf; |
65 |
/* insert in edge lists */ |
66 |
newmig->enxt[0] = from_rbf->ejl; |
67 |
from_rbf->ejl = newmig; |
68 |
newmig->enxt[1] = to_rbf->ejl; |
69 |
to_rbf->ejl = newmig; |
70 |
newmig->next = mig_list; /* push onto global list */ |
71 |
return(mig_list = newmig); |
72 |
} |
73 |
|
74 |
#ifdef _WIN32 |
75 |
#define await_children(n) (void)(n) |
76 |
#define run_subprocess() 0 |
77 |
#define end_subprocess() (void)0 |
78 |
#else |
79 |
|
80 |
/* Wait for the specified number of child processes to complete */ |
81 |
static void |
82 |
await_children(int n) |
83 |
{ |
84 |
int exit_status = 0; |
85 |
|
86 |
if (n > nchild) |
87 |
n = nchild; |
88 |
while (n-- > 0) { |
89 |
int status; |
90 |
if (wait(&status) < 0) { |
91 |
fprintf(stderr, "%s: missing child(ren)!\n", progname); |
92 |
nchild = 0; |
93 |
break; |
94 |
} |
95 |
--nchild; |
96 |
if (status) { /* something wrong */ |
97 |
if ((status = WEXITSTATUS(status))) |
98 |
exit_status = status; |
99 |
else |
100 |
exit_status += !exit_status; |
101 |
fprintf(stderr, "%s: subprocess died\n", progname); |
102 |
n = nchild; /* wait for the rest */ |
103 |
} |
104 |
} |
105 |
if (exit_status) |
106 |
exit(exit_status); |
107 |
} |
108 |
|
109 |
/* Start child process if multiprocessing selected */ |
110 |
static pid_t |
111 |
run_subprocess(void) |
112 |
{ |
113 |
int status; |
114 |
pid_t pid; |
115 |
|
116 |
if (nprocs <= 1) /* any children requested? */ |
117 |
return(0); |
118 |
await_children(nchild + 1 - nprocs); /* free up child process */ |
119 |
if ((pid = fork())) { |
120 |
if (pid < 0) { |
121 |
fprintf(stderr, "%s: cannot fork subprocess\n", |
122 |
progname); |
123 |
await_children(nchild); |
124 |
exit(1); |
125 |
} |
126 |
++nchild; /* subprocess started */ |
127 |
return(pid); |
128 |
} |
129 |
nchild = -1; |
130 |
return(0); /* put child to work */ |
131 |
} |
132 |
|
133 |
/* If we are in subprocess, call exit */ |
134 |
#define end_subprocess() if (nchild < 0) _exit(0); else |
135 |
|
136 |
#endif /* ! _WIN32 */ |
137 |
|
138 |
/* Comparison routine needed for sorting price row */ |
139 |
static int |
140 |
msrt_cmp(void *b, const void *p1, const void *p2) |
141 |
{ |
142 |
PRICEMAT *pm = (PRICEMAT *)b; |
143 |
float c1 = pm->prow[*(const short *)p1]; |
144 |
float c2 = pm->prow[*(const short *)p2]; |
145 |
|
146 |
if (c1 > c2) return(1); |
147 |
if (c1 < c2) return(-1); |
148 |
return(0); |
149 |
} |
150 |
|
151 |
/* Compute (and allocate) migration price matrix for optimization */ |
152 |
static void |
153 |
price_routes(PRICEMAT *pm, const RBFNODE *from_rbf, const RBFNODE *to_rbf) |
154 |
{ |
155 |
FVECT *vto = (FVECT *)malloc(sizeof(FVECT) * to_rbf->nrbf); |
156 |
int i, j; |
157 |
|
158 |
pm->nrows = from_rbf->nrbf; |
159 |
pm->ncols = to_rbf->nrbf; |
160 |
pm->price = (float *)malloc(sizeof(float) * pm->nrows*pm->ncols); |
161 |
pm->sord = (short *)malloc(sizeof(short) * pm->nrows*pm->ncols); |
162 |
|
163 |
if ((pm->price == NULL) | (pm->sord == NULL) | (vto == NULL)) { |
164 |
fprintf(stderr, "%s: Out of memory in migration_costs()\n", |
165 |
progname); |
166 |
exit(1); |
167 |
} |
168 |
for (j = to_rbf->nrbf; j--; ) /* save repetitive ops. */ |
169 |
ovec_from_pos(vto[j], to_rbf->rbfa[j].gx, to_rbf->rbfa[j].gy); |
170 |
|
171 |
for (i = from_rbf->nrbf; i--; ) { |
172 |
const double from_ang = R2ANG(from_rbf->rbfa[i].crad); |
173 |
FVECT vfrom; |
174 |
short *srow; |
175 |
ovec_from_pos(vfrom, from_rbf->rbfa[i].gx, from_rbf->rbfa[i].gy); |
176 |
pm->prow = pricerow(pm,i); |
177 |
srow = psortrow(pm,i); |
178 |
for (j = to_rbf->nrbf; j--; ) { |
179 |
double d; /* quadratic cost function */ |
180 |
d = DOT(vfrom, vto[j]); |
181 |
d = (d >= 1.) ? .0 : acos(d); |
182 |
pm->prow[j] = d*d; |
183 |
d = R2ANG(to_rbf->rbfa[j].crad) - from_ang; |
184 |
pm->prow[j] += d*d; |
185 |
srow[j] = j; |
186 |
} |
187 |
qsort_r(srow, pm->ncols, sizeof(short), pm, &msrt_cmp); |
188 |
} |
189 |
free(vto); |
190 |
} |
191 |
|
192 |
/* Free price matrix */ |
193 |
static void |
194 |
free_routes(PRICEMAT *pm) |
195 |
{ |
196 |
free(pm->price); pm->price = NULL; |
197 |
free(pm->sord); pm->sord = NULL; |
198 |
} |
199 |
|
200 |
/* Compute minimum (optimistic) cost for moving the given source material */ |
201 |
static double |
202 |
min_cost(double amt2move, const double *avail, const PRICEMAT *pm, int s) |
203 |
{ |
204 |
const short *srow = psortrow(pm,s); |
205 |
const float *prow = pricerow(pm,s); |
206 |
double total_cost = 0; |
207 |
int j; |
208 |
/* move cheapest first */ |
209 |
for (j = 0; (j < pm->ncols) & (amt2move > FTINY); j++) { |
210 |
int d = srow[j]; |
211 |
double amt = (amt2move < avail[d]) ? amt2move : avail[d]; |
212 |
|
213 |
total_cost += amt * prow[d]; |
214 |
amt2move -= amt; |
215 |
} |
216 |
return(total_cost); |
217 |
} |
218 |
|
219 |
/* Compare entries by moving price */ |
220 |
static int |
221 |
rmovcmp(void *b, const void *p1, const void *p2) |
222 |
{ |
223 |
PRICEMAT *pm = (PRICEMAT *)b; |
224 |
const short *ij1 = (const short *)p1; |
225 |
const short *ij2 = (const short *)p2; |
226 |
float price_diff; |
227 |
|
228 |
if (ij1[1] < 0) return(ij2[1] >= 0); |
229 |
if (ij2[1] < 0) return(-1); |
230 |
price_diff = pricerow(pm,ij1[0])[ij1[1]] - pricerow(pm,ij2[0])[ij2[1]]; |
231 |
if (price_diff > 0) return(1); |
232 |
if (price_diff < 0) return(-1); |
233 |
return(0); |
234 |
} |
235 |
|
236 |
/* Take a step in migration by choosing reasonable bucket to transfer */ |
237 |
static double |
238 |
migration_step(MIGRATION *mig, double *src_rem, double *dst_rem, PRICEMAT *pm) |
239 |
{ |
240 |
const int max2check = 100; |
241 |
const double maxamt = 1./(double)pm->ncols; |
242 |
const double minamt = maxamt*1e-4; |
243 |
double *src_cost; |
244 |
short (*rord)[2]; |
245 |
struct { |
246 |
int s, d; /* source and destination */ |
247 |
double price; /* price estimate per amount moved */ |
248 |
double amt; /* amount we can move */ |
249 |
} cur, best; |
250 |
int r2check, i, ri; |
251 |
/* |
252 |
* Check cheapest available routes only -- a higher adjusted |
253 |
* destination price implies that another source is closer, so |
254 |
* we can hold off considering more expensive options until |
255 |
* some other (hopefully better) moves have been made. |
256 |
*/ |
257 |
/* most promising row order */ |
258 |
rord = (short (*)[2])malloc(sizeof(short)*2*pm->nrows); |
259 |
if (rord == NULL) |
260 |
goto memerr; |
261 |
for (ri = pm->nrows; ri--; ) { |
262 |
rord[ri][0] = ri; |
263 |
rord[ri][1] = -1; |
264 |
if (src_rem[ri] <= minamt) /* enough source material? */ |
265 |
continue; |
266 |
for (i = 0; i < pm->ncols; i++) |
267 |
if (dst_rem[ rord[ri][1] = psortrow(pm,ri)[i] ] > minamt) |
268 |
break; |
269 |
if (i >= pm->ncols) { /* moved all we can? */ |
270 |
free(rord); |
271 |
return(.0); |
272 |
} |
273 |
} |
274 |
if (pm->nrows > max2check) /* sort if too many sources */ |
275 |
qsort_r(rord, pm->nrows, sizeof(short)*2, pm, &rmovcmp); |
276 |
/* allocate cost array */ |
277 |
src_cost = (double *)malloc(sizeof(double)*pm->nrows); |
278 |
if (src_cost == NULL) |
279 |
goto memerr; |
280 |
for (i = pm->nrows; i--; ) /* starting costs for diff. */ |
281 |
src_cost[i] = min_cost(src_rem[i], dst_rem, pm, i); |
282 |
/* find best source & dest. */ |
283 |
best.s = best.d = -1; best.price = FHUGE; best.amt = 0; |
284 |
if ((r2check = pm->nrows) > max2check) |
285 |
r2check = max2check; /* put a limit on search */ |
286 |
for (ri = 0; ri < r2check; ri++) { /* check each source row */ |
287 |
double cost_others = 0; |
288 |
cur.s = rord[ri][0]; |
289 |
if ((cur.d = rord[ri][1]) < 0 || |
290 |
(cur.price = pricerow(pm,cur.s)[cur.d]) >= best.price) { |
291 |
if (pm->nrows > max2check) break; /* sorted end */ |
292 |
continue; /* else skip this one */ |
293 |
} |
294 |
cur.amt = (src_rem[cur.s] < dst_rem[cur.d]) ? |
295 |
src_rem[cur.s] : dst_rem[cur.d]; |
296 |
/* don't just leave smidgen */ |
297 |
if (cur.amt > maxamt*1.02) cur.amt = maxamt; |
298 |
dst_rem[cur.d] -= cur.amt; /* add up opportunity costs */ |
299 |
for (i = pm->nrows; i--; ) |
300 |
if (i != cur.s) |
301 |
cost_others += min_cost(src_rem[i], dst_rem, pm, i) |
302 |
- src_cost[i]; |
303 |
dst_rem[cur.d] += cur.amt; /* undo trial move */ |
304 |
cur.price += cost_others/cur.amt; /* adjust effective price */ |
305 |
if (cur.price < best.price) /* are we better than best? */ |
306 |
best = cur; |
307 |
} |
308 |
free(src_cost); /* clean up */ |
309 |
free(rord); |
310 |
if ((best.s < 0) | (best.d < 0)) /* nothing left to move? */ |
311 |
return(.0); |
312 |
/* else make the actual move */ |
313 |
mtx_coef(mig,best.s,best.d) += best.amt; |
314 |
src_rem[best.s] -= best.amt; |
315 |
dst_rem[best.d] -= best.amt; |
316 |
return(best.amt); |
317 |
memerr: |
318 |
fprintf(stderr, "%s: Out of memory in migration_step()\n", progname); |
319 |
exit(1); |
320 |
} |
321 |
|
322 |
/* Compute and insert migration along directed edge (may fork child) */ |
323 |
static MIGRATION * |
324 |
create_migration(RBFNODE *from_rbf, RBFNODE *to_rbf) |
325 |
{ |
326 |
const double end_thresh = 5e-6; |
327 |
PRICEMAT pmtx; |
328 |
MIGRATION *newmig; |
329 |
double *src_rem, *dst_rem; |
330 |
double total_rem = 1., move_amt; |
331 |
int i, j; |
332 |
/* check if exists already */ |
333 |
for (newmig = from_rbf->ejl; newmig != NULL; |
334 |
newmig = nextedge(from_rbf,newmig)) |
335 |
if (newmig->rbfv[1] == to_rbf) |
336 |
return(NULL); |
337 |
/* else allocate */ |
338 |
#ifdef DEBUG |
339 |
fprintf(stderr, "Building path from (theta,phi) (%.1f,%.1f) ", |
340 |
get_theta180(from_rbf->invec), |
341 |
get_phi360(from_rbf->invec)); |
342 |
fprintf(stderr, "to (%.1f,%.1f) with %d x %d matrix\n", |
343 |
get_theta180(to_rbf->invec), |
344 |
get_phi360(to_rbf->invec), |
345 |
from_rbf->nrbf, to_rbf->nrbf); |
346 |
#endif |
347 |
newmig = new_migration(from_rbf, to_rbf); |
348 |
if (run_subprocess()) |
349 |
return(newmig); /* child continues */ |
350 |
price_routes(&pmtx, from_rbf, to_rbf); |
351 |
src_rem = (double *)malloc(sizeof(double)*from_rbf->nrbf); |
352 |
dst_rem = (double *)malloc(sizeof(double)*to_rbf->nrbf); |
353 |
if ((src_rem == NULL) | (dst_rem == NULL)) { |
354 |
fprintf(stderr, "%s: Out of memory in create_migration()\n", |
355 |
progname); |
356 |
exit(1); |
357 |
} |
358 |
/* starting quantities */ |
359 |
memset(newmig->mtx, 0, sizeof(float)*from_rbf->nrbf*to_rbf->nrbf); |
360 |
for (i = from_rbf->nrbf; i--; ) |
361 |
src_rem[i] = rbf_volume(&from_rbf->rbfa[i]) / from_rbf->vtotal; |
362 |
for (j = to_rbf->nrbf; j--; ) |
363 |
dst_rem[j] = rbf_volume(&to_rbf->rbfa[j]) / to_rbf->vtotal; |
364 |
|
365 |
do { /* move a bit at a time */ |
366 |
move_amt = migration_step(newmig, src_rem, dst_rem, &pmtx); |
367 |
total_rem -= move_amt; |
368 |
} while ((total_rem > end_thresh) & (move_amt > 0)); |
369 |
|
370 |
for (i = from_rbf->nrbf; i--; ) { /* normalize final matrix */ |
371 |
double nf = rbf_volume(&from_rbf->rbfa[i]); |
372 |
if (nf <= FTINY) continue; |
373 |
nf = from_rbf->vtotal / nf; |
374 |
for (j = to_rbf->nrbf; j--; ) |
375 |
mtx_coef(newmig,i,j) *= nf; /* row now sums to 1.0 */ |
376 |
} |
377 |
end_subprocess(); /* exit here if subprocess */ |
378 |
free_routes(&pmtx); /* free working arrays */ |
379 |
free(src_rem); |
380 |
free(dst_rem); |
381 |
return(newmig); |
382 |
} |
383 |
|
384 |
/* Check if prospective vertex would create overlapping triangle */ |
385 |
static int |
386 |
overlaps_tri(const RBFNODE *bv0, const RBFNODE *bv1, const RBFNODE *pv) |
387 |
{ |
388 |
const MIGRATION *ej; |
389 |
RBFNODE *vother[2]; |
390 |
int im_rev; |
391 |
/* find shared edge in mesh */ |
392 |
for (ej = pv->ejl; ej != NULL; ej = nextedge(pv,ej)) { |
393 |
const RBFNODE *tv = opp_rbf(pv,ej); |
394 |
if (tv == bv0) { |
395 |
im_rev = is_rev_tri(ej->rbfv[0]->invec, |
396 |
ej->rbfv[1]->invec, bv1->invec); |
397 |
break; |
398 |
} |
399 |
if (tv == bv1) { |
400 |
im_rev = is_rev_tri(ej->rbfv[0]->invec, |
401 |
ej->rbfv[1]->invec, bv0->invec); |
402 |
break; |
403 |
} |
404 |
} |
405 |
if (!get_triangles(vother, ej)) /* triangle on same side? */ |
406 |
return(0); |
407 |
return(vother[im_rev] != NULL); |
408 |
} |
409 |
|
410 |
/* Find convex hull vertex to complete triangle (oriented call) */ |
411 |
static RBFNODE * |
412 |
find_chull_vert(const RBFNODE *rbf0, const RBFNODE *rbf1) |
413 |
{ |
414 |
FVECT vmid, vejn, vp; |
415 |
RBFNODE *rbf, *rbfbest = NULL; |
416 |
double dprod, area2, bestarea2 = FHUGE, bestdprod = -.5; |
417 |
|
418 |
VSUB(vejn, rbf1->invec, rbf0->invec); |
419 |
VADD(vmid, rbf0->invec, rbf1->invec); |
420 |
if (normalize(vejn) == 0 || normalize(vmid) == 0) |
421 |
return(NULL); |
422 |
/* XXX exhaustive search */ |
423 |
/* Find triangle with minimum rotation from perpendicular */ |
424 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) { |
425 |
if ((rbf == rbf0) | (rbf == rbf1)) |
426 |
continue; |
427 |
tri_orient(vp, rbf0->invec, rbf1->invec, rbf->invec); |
428 |
if (DOT(vp, vmid) <= FTINY) |
429 |
continue; /* wrong orientation */ |
430 |
area2 = .25*DOT(vp,vp); |
431 |
VSUB(vp, rbf->invec, vmid); |
432 |
dprod = -DOT(vp, vejn); |
433 |
VSUM(vp, vp, vejn, dprod); /* above guarantees non-zero */ |
434 |
dprod = DOT(vp, vmid) / VLEN(vp); |
435 |
if (dprod <= bestdprod + FTINY*(1 - 2*(area2 < bestarea2))) |
436 |
continue; /* found better already */ |
437 |
if (overlaps_tri(rbf0, rbf1, rbf)) |
438 |
continue; /* overlaps another triangle */ |
439 |
rbfbest = rbf; |
440 |
bestdprod = dprod; /* new one to beat */ |
441 |
bestarea2 = area2; |
442 |
} |
443 |
return(rbfbest); |
444 |
} |
445 |
|
446 |
/* Create new migration edge and grow mesh recursively around it */ |
447 |
static void |
448 |
mesh_from_edge(MIGRATION *edge) |
449 |
{ |
450 |
MIGRATION *ej0, *ej1; |
451 |
RBFNODE *tvert[2]; |
452 |
|
453 |
if (edge == NULL) |
454 |
return; |
455 |
/* triangle on either side? */ |
456 |
get_triangles(tvert, edge); |
457 |
if (tvert[0] == NULL) { /* grow mesh on right */ |
458 |
tvert[0] = find_chull_vert(edge->rbfv[0], edge->rbfv[1]); |
459 |
if (tvert[0] != NULL) { |
460 |
if (tvert[0]->ord > edge->rbfv[0]->ord) |
461 |
ej0 = create_migration(edge->rbfv[0], tvert[0]); |
462 |
else |
463 |
ej0 = create_migration(tvert[0], edge->rbfv[0]); |
464 |
if (tvert[0]->ord > edge->rbfv[1]->ord) |
465 |
ej1 = create_migration(edge->rbfv[1], tvert[0]); |
466 |
else |
467 |
ej1 = create_migration(tvert[0], edge->rbfv[1]); |
468 |
mesh_from_edge(ej0); |
469 |
mesh_from_edge(ej1); |
470 |
} |
471 |
} else if (tvert[1] == NULL) { /* grow mesh on left */ |
472 |
tvert[1] = find_chull_vert(edge->rbfv[1], edge->rbfv[0]); |
473 |
if (tvert[1] != NULL) { |
474 |
if (tvert[1]->ord > edge->rbfv[0]->ord) |
475 |
ej0 = create_migration(edge->rbfv[0], tvert[1]); |
476 |
else |
477 |
ej0 = create_migration(tvert[1], edge->rbfv[0]); |
478 |
if (tvert[1]->ord > edge->rbfv[1]->ord) |
479 |
ej1 = create_migration(edge->rbfv[1], tvert[1]); |
480 |
else |
481 |
ej1 = create_migration(tvert[1], edge->rbfv[1]); |
482 |
mesh_from_edge(ej0); |
483 |
mesh_from_edge(ej1); |
484 |
} |
485 |
} |
486 |
} |
487 |
|
488 |
/* Add normal direction if missing */ |
489 |
static void |
490 |
check_normal_incidence(void) |
491 |
{ |
492 |
const int saved_nprocs = nprocs; |
493 |
RBFNODE *near_rbf, *mir_rbf, *rbf; |
494 |
double bestd; |
495 |
int n, i, j; |
496 |
|
497 |
if (dsf_list == NULL) |
498 |
return; /* XXX should be error? */ |
499 |
near_rbf = dsf_list; |
500 |
bestd = input_orient*near_rbf->invec[2]; |
501 |
if (single_plane_incident) { /* ordered plane incidence? */ |
502 |
if (bestd >= 1.-2.*FTINY) |
503 |
return; /* already have normal */ |
504 |
} else { |
505 |
switch (inp_coverage) { |
506 |
case INP_QUAD1: |
507 |
case INP_QUAD2: |
508 |
case INP_QUAD3: |
509 |
case INP_QUAD4: |
510 |
break; /* quadrilateral symmetry? */ |
511 |
default: |
512 |
return; /* else we can interpolate */ |
513 |
} |
514 |
for (rbf = near_rbf->next; rbf != NULL; rbf = rbf->next) { |
515 |
const double d = input_orient*rbf->invec[2]; |
516 |
if (d >= 1.-2.*FTINY) |
517 |
return; /* seems we have normal */ |
518 |
if (d > bestd) { |
519 |
near_rbf = rbf; |
520 |
bestd = d; |
521 |
} |
522 |
} |
523 |
} |
524 |
if (mig_list != NULL) { /* need to be called first */ |
525 |
fprintf(stderr, "%s: Late call to check_normal_incidence()\n", |
526 |
progname); |
527 |
exit(1); |
528 |
} |
529 |
#ifdef DEBUG |
530 |
fprintf(stderr, "Interpolating normal incidence by mirroring (%.1f,%.1f)\n", |
531 |
get_theta180(near_rbf->invec), get_phi360(near_rbf->invec)); |
532 |
#endif |
533 |
/* mirror nearest incidence */ |
534 |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(near_rbf->nrbf-1); |
535 |
mir_rbf = (RBFNODE *)malloc(n); |
536 |
if (mir_rbf == NULL) |
537 |
goto memerr; |
538 |
memcpy(mir_rbf, near_rbf, n); |
539 |
mir_rbf->ord = near_rbf->ord - 1; /* not used, I think */ |
540 |
mir_rbf->next = NULL; |
541 |
rev_rbf_symmetry(mir_rbf, MIRROR_X|MIRROR_Y); |
542 |
nprocs = 1; /* compute migration matrix */ |
543 |
if (mig_list != create_migration(mir_rbf, near_rbf)) |
544 |
exit(1); /* XXX should never happen! */ |
545 |
n = 0; /* count migrating particles */ |
546 |
for (i = 0; i < mtx_nrows(mig_list); i++) |
547 |
for (j = 0; j < mtx_ncols(mig_list); j++) |
548 |
n += (mtx_coef(mig_list,i,j) > FTINY); |
549 |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
550 |
if (rbf == NULL) |
551 |
goto memerr; |
552 |
rbf->next = NULL; rbf->ejl = NULL; |
553 |
rbf->invec[0] = rbf->invec[1] = 0; rbf->invec[2] = 1.; |
554 |
rbf->nrbf = n; |
555 |
rbf->vtotal = .5 + .5*mig_list->rbfv[1]->vtotal/mig_list->rbfv[0]->vtotal; |
556 |
n = 0; /* advect RBF lobes halfway */ |
557 |
for (i = 0; i < mtx_nrows(mig_list); i++) { |
558 |
const RBFVAL *rbf0i = &mig_list->rbfv[0]->rbfa[i]; |
559 |
const float peak0 = rbf0i->peak; |
560 |
const double rad0 = R2ANG(rbf0i->crad); |
561 |
FVECT v0; |
562 |
float mv; |
563 |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
564 |
for (j = 0; j < mtx_ncols(mig_list); j++) |
565 |
if ((mv = mtx_coef(mig_list,i,j)) > FTINY) { |
566 |
const RBFVAL *rbf1j = &mig_list->rbfv[1]->rbfa[j]; |
567 |
double rad2; |
568 |
FVECT v; |
569 |
int pos[2]; |
570 |
rad2 = R2ANG(rbf1j->crad); |
571 |
rad2 = .5*(rad0*rad0 + rad2*rad2); |
572 |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal * |
573 |
rad0*rad0/rad2; |
574 |
rbf->rbfa[n].crad = ANG2R(sqrt(rad2)); |
575 |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy); |
576 |
geodesic(v, v0, v, .5, GEOD_REL); |
577 |
pos_from_vec(pos, v); |
578 |
rbf->rbfa[n].gx = pos[0]; |
579 |
rbf->rbfa[n].gy = pos[1]; |
580 |
++n; |
581 |
} |
582 |
} |
583 |
rbf->vtotal *= mig_list->rbfv[0]->vtotal; |
584 |
nprocs = saved_nprocs; /* final clean-up */ |
585 |
free(mir_rbf); |
586 |
free(mig_list); |
587 |
mig_list = near_rbf->ejl = NULL; |
588 |
insert_dsf(rbf); /* insert interpolated normal */ |
589 |
return; |
590 |
memerr: |
591 |
fprintf(stderr, "%s: Out of memory in check_normal_incidence()\n", |
592 |
progname); |
593 |
exit(1); |
594 |
} |
595 |
|
596 |
/* Build our triangle mesh from recorded RBFs */ |
597 |
void |
598 |
build_mesh(void) |
599 |
{ |
600 |
double best2 = M_PI*M_PI; |
601 |
RBFNODE *shrt_edj[2]; |
602 |
RBFNODE *rbf0, *rbf1; |
603 |
/* add normal if needed */ |
604 |
check_normal_incidence(); |
605 |
/* check if isotropic */ |
606 |
if (single_plane_incident) { |
607 |
for (rbf0 = dsf_list; rbf0 != NULL; rbf0 = rbf0->next) |
608 |
if (rbf0->next != NULL) |
609 |
create_migration(rbf0, rbf0->next); |
610 |
await_children(nchild); |
611 |
return; |
612 |
} |
613 |
shrt_edj[0] = shrt_edj[1] = NULL; /* start w/ shortest edge */ |
614 |
for (rbf0 = dsf_list; rbf0 != NULL; rbf0 = rbf0->next) |
615 |
for (rbf1 = rbf0->next; rbf1 != NULL; rbf1 = rbf1->next) { |
616 |
double dist2 = 2. - 2.*DOT(rbf0->invec,rbf1->invec); |
617 |
if (dist2 < best2) { |
618 |
shrt_edj[0] = rbf0; |
619 |
shrt_edj[1] = rbf1; |
620 |
best2 = dist2; |
621 |
} |
622 |
} |
623 |
if (shrt_edj[0] == NULL) { |
624 |
fprintf(stderr, "%s: Cannot find shortest edge\n", progname); |
625 |
exit(1); |
626 |
} |
627 |
/* build mesh from this edge */ |
628 |
if (shrt_edj[0]->ord < shrt_edj[1]->ord) |
629 |
mesh_from_edge(create_migration(shrt_edj[0], shrt_edj[1])); |
630 |
else |
631 |
mesh_from_edge(create_migration(shrt_edj[1], shrt_edj[0])); |
632 |
/* complete migrations */ |
633 |
await_children(nchild); |
634 |
} |