1 |
/* Copyright (c) 1994 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* Convert a Wavefront .obj file to Radiance format. |
9 |
* |
10 |
* Currently, we support only polygonal geometry. Non-planar |
11 |
* faces are broken rather haphazardly into triangles. |
12 |
* Also, texture map indices only work for triangles, though |
13 |
* I'm not sure they work correctly. (Taken out -- see TEXMAPS defines.) |
14 |
*/ |
15 |
|
16 |
#include "standard.h" |
17 |
|
18 |
#include "trans.h" |
19 |
|
20 |
#include <ctype.h> |
21 |
|
22 |
#define TCALNAME "tmesh.cal" /* triangle interp. file */ |
23 |
#define QCALNAME "surf.cal" /* quad interp. file */ |
24 |
#define PATNAME "M-pat" /* mesh pattern name (reused) */ |
25 |
#define TEXNAME "M-nor" /* mesh texture name (reused) */ |
26 |
#define DEFOBJ "unnamed" /* default object name */ |
27 |
#define DEFMAT "white" /* default material name */ |
28 |
|
29 |
#define ABS(x) ((x)>=0 ? (x) : -(x)) |
30 |
|
31 |
#define pvect(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
32 |
|
33 |
FVECT *vlist; /* our vertex list */ |
34 |
int nvs; /* number of vertices in our list */ |
35 |
FVECT *vnlist; /* vertex normal list */ |
36 |
int nvns; |
37 |
FLOAT (*vtlist)[2]; /* map vertex list */ |
38 |
int nvts; |
39 |
|
40 |
typedef struct { |
41 |
int ax; /* major axis */ |
42 |
FLOAT tm[2][3]; /* transformation */ |
43 |
} BARYCCM; |
44 |
|
45 |
typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
46 |
|
47 |
#define CHUNKSIZ 256 /* vertex allocation chunk size */ |
48 |
|
49 |
#define MAXARG 64 /* maximum # arguments in a statement */ |
50 |
|
51 |
/* qualifiers */ |
52 |
#define Q_MTL 0 |
53 |
#define Q_MAP 1 |
54 |
#define Q_GRP 2 |
55 |
#define Q_OBJ 3 |
56 |
#define Q_FAC 4 |
57 |
#define NQUALS 5 |
58 |
|
59 |
char *qname[NQUALS] = { |
60 |
"Material", |
61 |
"Map", |
62 |
"Group", |
63 |
"Object", |
64 |
"Face", |
65 |
}; |
66 |
|
67 |
QLIST qlist = {NQUALS, qname}; |
68 |
/* valid qualifier ids */ |
69 |
IDLIST qual[NQUALS]; |
70 |
/* mapping rules */ |
71 |
RULEHD *ourmapping = NULL; |
72 |
|
73 |
char *defmat = DEFMAT; /* default (starting) material name */ |
74 |
char *defobj = DEFOBJ; /* default (starting) object name */ |
75 |
|
76 |
int flatten = 0; /* discard surface normal information */ |
77 |
|
78 |
char *getmtl(), *getonm(); |
79 |
|
80 |
char mapname[128]; /* current picture file */ |
81 |
char matname[64]; /* current material name */ |
82 |
char group[16][32]; /* current group names */ |
83 |
char objname[128]; /* current object name */ |
84 |
char *inpfile; /* input file name */ |
85 |
int lineno; /* current line number */ |
86 |
int faceno; /* current face number */ |
87 |
|
88 |
|
89 |
main(argc, argv) /* read in .obj file and convert */ |
90 |
int argc; |
91 |
char *argv[]; |
92 |
{ |
93 |
int donames = 0; |
94 |
int i; |
95 |
|
96 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
97 |
switch (argv[i][1]) { |
98 |
case 'o': /* object name */ |
99 |
defobj = argv[++i]; |
100 |
break; |
101 |
case 'n': /* just produce name list */ |
102 |
donames++; |
103 |
break; |
104 |
case 'm': /* use custom mapfile */ |
105 |
ourmapping = getmapping(argv[++i], &qlist); |
106 |
break; |
107 |
case 'f': /* flatten surfaces */ |
108 |
flatten++; |
109 |
break; |
110 |
default: |
111 |
goto userr; |
112 |
} |
113 |
if (i > argc | i < argc-1) |
114 |
goto userr; |
115 |
if (i == argc) |
116 |
inpfile = "<stdin>"; |
117 |
else if (freopen(inpfile=argv[i], "r", stdin) == NULL) { |
118 |
fprintf(stderr, "%s: cannot open\n", inpfile); |
119 |
exit(1); |
120 |
} |
121 |
if (donames) { /* scan for ids */ |
122 |
getnames(stdin); |
123 |
printf("filename \"%s\"\n", inpfile); |
124 |
printf("filetype \"Wavefront\"\n"); |
125 |
write_quals(&qlist, qual, stdout); |
126 |
printf("qualifier %s begin\n", qlist.qual[Q_FAC]); |
127 |
printf("[%d:%d]\n", 1, faceno); |
128 |
printf("end\n"); |
129 |
} else { /* translate file */ |
130 |
printf("# "); |
131 |
printargs(argc, argv, stdout); |
132 |
convert(stdin); |
133 |
} |
134 |
exit(0); |
135 |
userr: |
136 |
fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n][-f] [file.obj]\n", |
137 |
argv[0]); |
138 |
exit(1); |
139 |
} |
140 |
|
141 |
|
142 |
getnames(fp) /* get valid qualifier names */ |
143 |
FILE *fp; |
144 |
{ |
145 |
char *argv[MAXARG]; |
146 |
int argc; |
147 |
ID tmpid; |
148 |
register int i; |
149 |
|
150 |
while (argc = getstmt(argv, fp)) |
151 |
switch (argv[0][0]) { |
152 |
case 'f': /* face */ |
153 |
if (!argv[0][1]) |
154 |
faceno++; |
155 |
break; |
156 |
case 'u': |
157 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
158 |
if (argc < 2) |
159 |
break; /* not fatal */ |
160 |
tmpid.number = 0; |
161 |
tmpid.name = argv[1]; |
162 |
findid(&qual[Q_MTL], &tmpid, 1); |
163 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
164 |
if (argc < 2 || !strcmp(argv[1], "off")) |
165 |
break; /* not fatal */ |
166 |
tmpid.number = 0; |
167 |
tmpid.name = argv[1]; |
168 |
findid(&qual[Q_MAP], &tmpid, 1); |
169 |
} |
170 |
break; |
171 |
case 'o': /* object name */ |
172 |
if (argv[0][1] || argc < 2) |
173 |
break; |
174 |
tmpid.number = 0; |
175 |
tmpid.name = argv[1]; |
176 |
findid(&qual[Q_OBJ], &tmpid, 1); |
177 |
break; |
178 |
case 'g': /* group name(s) */ |
179 |
if (argv[0][1]) |
180 |
break; |
181 |
tmpid.number = 0; |
182 |
for (i = 1; i < argc; i++) { |
183 |
tmpid.name = argv[i]; |
184 |
findid(&qual[Q_GRP], &tmpid, 1); |
185 |
} |
186 |
break; |
187 |
} |
188 |
} |
189 |
|
190 |
|
191 |
convert(fp) /* convert a T-mesh */ |
192 |
FILE *fp; |
193 |
{ |
194 |
char *argv[MAXARG]; |
195 |
int argc; |
196 |
int nstats, nunknown; |
197 |
register int i; |
198 |
|
199 |
nstats = nunknown = 0; |
200 |
/* scan until EOF */ |
201 |
while (argc = getstmt(argv, fp)) { |
202 |
switch (argv[0][0]) { |
203 |
case 'v': /* vertex */ |
204 |
switch (argv[0][1]) { |
205 |
case '\0': /* point */ |
206 |
if (badarg(argc-1,argv+1,"fff")) |
207 |
syntax("Bad vertex"); |
208 |
newv(atof(argv[1]), atof(argv[2]), |
209 |
atof(argv[3])); |
210 |
break; |
211 |
case 'n': /* normal */ |
212 |
if (argv[0][2]) |
213 |
goto unknown; |
214 |
if (badarg(argc-1,argv+1,"fff")) |
215 |
syntax("Bad normal"); |
216 |
if (!newvn(atof(argv[1]), atof(argv[2]), |
217 |
atof(argv[3]))) |
218 |
syntax("Zero normal"); |
219 |
break; |
220 |
case 't': /* texture map */ |
221 |
if (argv[0][2]) |
222 |
goto unknown; |
223 |
if (badarg(argc-1,argv+1,"ff")) |
224 |
goto unknown; |
225 |
newvt(atof(argv[1]), atof(argv[2])); |
226 |
break; |
227 |
default: |
228 |
goto unknown; |
229 |
} |
230 |
break; |
231 |
case 'f': /* face */ |
232 |
if (argv[0][1]) |
233 |
goto unknown; |
234 |
faceno++; |
235 |
switch (argc-1) { |
236 |
case 0: case 1: case 2: |
237 |
syntax("Too few vertices"); |
238 |
break; |
239 |
case 3: |
240 |
if (!puttri(argv[1], argv[2], argv[3])) |
241 |
syntax("Bad triangle"); |
242 |
break; |
243 |
case 4: |
244 |
if (!putquad(argv[1], argv[2], |
245 |
argv[3], argv[4])) |
246 |
syntax("Bad quad"); |
247 |
break; |
248 |
default: |
249 |
if (!putface(argc-1, argv+1)) |
250 |
syntax("Bad face"); |
251 |
break; |
252 |
} |
253 |
break; |
254 |
case 'u': |
255 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
256 |
if (argc < 2) |
257 |
break; /* not fatal */ |
258 |
strcpy(matname, argv[1]); |
259 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
260 |
if (argc < 2) |
261 |
break; /* not fatal */ |
262 |
if (!strcmp(argv[1], "off")) |
263 |
mapname[0] = '\0'; |
264 |
else |
265 |
sprintf(mapname, "%s.pic", argv[1]); |
266 |
} else |
267 |
goto unknown; |
268 |
break; |
269 |
case 'o': /* object name */ |
270 |
if (argv[0][1]) |
271 |
goto unknown; |
272 |
if (argc < 2) |
273 |
break; /* not fatal */ |
274 |
strcpy(objname, argv[1]); |
275 |
break; |
276 |
case 'g': /* group name(s) */ |
277 |
if (argv[0][1]) |
278 |
goto unknown; |
279 |
for (i = 1; i < argc; i++) |
280 |
strcpy(group[i-1], argv[i]); |
281 |
group[i-1][0] = '\0'; |
282 |
break; |
283 |
case '#': /* comment */ |
284 |
printargs(argc, argv, stdout); |
285 |
break; |
286 |
default:; /* something we don't deal with */ |
287 |
unknown: |
288 |
nunknown++; |
289 |
break; |
290 |
} |
291 |
nstats++; |
292 |
} |
293 |
printf("\n# Done processing file: %s\n", inpfile); |
294 |
printf("# %d lines, %d statements, %d unrecognized\n", |
295 |
lineno, nstats, nunknown); |
296 |
} |
297 |
|
298 |
|
299 |
int |
300 |
getstmt(av, fp) /* read the next statement from fp */ |
301 |
register char *av[MAXARG]; |
302 |
FILE *fp; |
303 |
{ |
304 |
extern char *fgetline(); |
305 |
static char sbuf[MAXARG*10]; |
306 |
register char *cp; |
307 |
register int i; |
308 |
|
309 |
do { |
310 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
311 |
return(0); |
312 |
i = 0; |
313 |
for ( ; ; ) { |
314 |
while (isspace(*cp) || *cp == '\\') { |
315 |
if (*cp == '\n') |
316 |
lineno++; |
317 |
*cp++ = '\0'; |
318 |
} |
319 |
if (!*cp || i >= MAXARG-1) |
320 |
break; |
321 |
av[i++] = cp; |
322 |
while (*++cp && !isspace(*cp)) |
323 |
; |
324 |
} |
325 |
av[i] = NULL; |
326 |
lineno++; |
327 |
} while (!i); |
328 |
|
329 |
return(i); |
330 |
} |
331 |
|
332 |
|
333 |
char * |
334 |
getmtl() /* figure material for this face */ |
335 |
{ |
336 |
register RULEHD *rp = ourmapping; |
337 |
|
338 |
if (rp == NULL) { /* no rule set */ |
339 |
if (matname[0]) |
340 |
return(matname); |
341 |
if (group[0][0]) |
342 |
return(group[0]); |
343 |
return(defmat); |
344 |
} |
345 |
/* check for match */ |
346 |
do { |
347 |
if (matchrule(rp)) { |
348 |
if (!strcmp(rp->mnam, VOIDID)) |
349 |
return(NULL); /* match is null */ |
350 |
return(rp->mnam); |
351 |
} |
352 |
rp = rp->next; |
353 |
} while (rp != NULL); |
354 |
/* no match found */ |
355 |
return(NULL); |
356 |
} |
357 |
|
358 |
|
359 |
char * |
360 |
getonm() /* invent a good name for object */ |
361 |
{ |
362 |
static char name[64]; |
363 |
register char *cp1, *cp2; |
364 |
register int i; |
365 |
/* check for preset */ |
366 |
if (objname[0]) |
367 |
return(objname); |
368 |
if (!group[0][0]) |
369 |
return(defobj); |
370 |
cp1 = name; /* else make name out of groups */ |
371 |
for (i = 0; group[i][0]; i++) { |
372 |
cp2 = group[i]; |
373 |
if (cp1 > name) |
374 |
*cp1++ = '.'; |
375 |
while (*cp1 = *cp2++) |
376 |
if (++cp1 >= name+sizeof(name)-2) { |
377 |
*cp1 = '\0'; |
378 |
return(name); |
379 |
} |
380 |
} |
381 |
return(name); |
382 |
} |
383 |
|
384 |
|
385 |
matchrule(rp) /* check for a match on this rule */ |
386 |
register RULEHD *rp; |
387 |
{ |
388 |
ID tmpid; |
389 |
int gotmatch; |
390 |
register int i; |
391 |
|
392 |
if (rp->qflg & FL(Q_MTL)) { |
393 |
if (!matname[0]) |
394 |
return(0); |
395 |
tmpid.number = 0; |
396 |
tmpid.name = matname; |
397 |
if (!matchid(&tmpid, &idm(rp)[Q_MTL])) |
398 |
return(0); |
399 |
} |
400 |
if (rp->qflg & FL(Q_MAP)) { |
401 |
if (!mapname[0]) |
402 |
return(0); |
403 |
tmpid.number = 0; |
404 |
tmpid.name = mapname; |
405 |
if (!matchid(&tmpid, &idm(rp)[Q_MAP])) |
406 |
return(0); |
407 |
} |
408 |
if (rp->qflg & FL(Q_GRP)) { |
409 |
tmpid.number = 0; |
410 |
gotmatch = 0; |
411 |
for (i = 0; group[i][0]; i++) { |
412 |
tmpid.name = group[i]; |
413 |
gotmatch |= matchid(&tmpid, &idm(rp)[Q_GRP]); |
414 |
} |
415 |
if (!gotmatch) |
416 |
return(0); |
417 |
} |
418 |
if (rp->qflg & FL(Q_OBJ)) { |
419 |
if (!objname[0]) |
420 |
return(0); |
421 |
tmpid.number = 0; |
422 |
tmpid.name = objname; |
423 |
if (!matchid(&tmpid, &idm(rp)[Q_OBJ])) |
424 |
return(0); |
425 |
} |
426 |
if (rp->qflg & FL(Q_FAC)) { |
427 |
tmpid.name = NULL; |
428 |
tmpid.number = faceno; |
429 |
if (!matchid(&tmpid, &idm(rp)[Q_FAC])) |
430 |
return(0); |
431 |
} |
432 |
return(1); |
433 |
} |
434 |
|
435 |
|
436 |
cvtndx(vi, vs) /* convert vertex string to index */ |
437 |
register VNDX vi; |
438 |
register char *vs; |
439 |
{ |
440 |
/* get point */ |
441 |
vi[0] = atoi(vs); |
442 |
if (vi[0] > 0) { |
443 |
if (vi[0]-- > nvs) |
444 |
return(0); |
445 |
} else if (vi[0] < 0) { |
446 |
vi[0] += nvs; |
447 |
if (vi[0] < 0) |
448 |
return(0); |
449 |
} else |
450 |
return(0); |
451 |
/* get map */ |
452 |
while (*vs) |
453 |
if (*vs++ == '/') |
454 |
break; |
455 |
vi[1] = atoi(vs); |
456 |
if (vi[1] > 0) { |
457 |
if (vi[1]-- > nvts) |
458 |
return(0); |
459 |
} else if (vi[1] < 0) { |
460 |
vi[1] += nvts; |
461 |
if (vi[1] < 0) |
462 |
return(0); |
463 |
} else |
464 |
vi[1] = -1; |
465 |
/* get normal */ |
466 |
while (*vs) |
467 |
if (*vs++ == '/') |
468 |
break; |
469 |
vi[2] = atoi(vs); |
470 |
if (vi[2] > 0) { |
471 |
if (vi[2]-- > nvns) |
472 |
return(0); |
473 |
} else if (vi[2] < 0) { |
474 |
vi[2] += nvns; |
475 |
if (vi[2] < 0) |
476 |
return(0); |
477 |
} else |
478 |
vi[2] = -1; |
479 |
return(1); |
480 |
} |
481 |
|
482 |
|
483 |
nonplanar(ac, av) /* are vertices non-planar? */ |
484 |
register int ac; |
485 |
register char **av; |
486 |
{ |
487 |
VNDX vi; |
488 |
FLOAT *p0, *p1; |
489 |
FVECT v1, v2, nsum, newn; |
490 |
double d; |
491 |
register int i; |
492 |
|
493 |
if (!cvtndx(vi, av[0])) |
494 |
return(0); |
495 |
if (vi[2] >= 0) |
496 |
return(1); /* has interpolated normals */ |
497 |
if (ac < 4) |
498 |
return(0); /* it's a triangle! */ |
499 |
/* set up */ |
500 |
p0 = vlist[vi[0]]; |
501 |
if (!cvtndx(vi, av[1])) |
502 |
return(0); /* error gets caught later */ |
503 |
nsum[0] = nsum[1] = nsum[2] = 0.; |
504 |
p1 = vlist[vi[0]]; |
505 |
fvsum(v2, p1, p0, -1.0); |
506 |
for (i = 2; i < ac; i++) { |
507 |
VCOPY(v1, v2); |
508 |
if (!cvtndx(vi, av[i])) |
509 |
return(0); |
510 |
p1 = vlist[vi[0]]; |
511 |
fvsum(v2, p1, p0, -1.0); |
512 |
fcross(newn, v1, v2); |
513 |
if (normalize(newn) == 0.0) { |
514 |
if (i < 3) |
515 |
return(1); /* can't deal with this */ |
516 |
fvsum(nsum, nsum, nsum, 1./(i-2)); |
517 |
continue; |
518 |
} |
519 |
d = fdot(newn,nsum); |
520 |
if (d >= 0) { |
521 |
if (d < (1.0-FTINY)*(i-2)) |
522 |
return(1); |
523 |
fvsum(nsum, nsum, newn, 1.0); |
524 |
} else { |
525 |
if (d > -(1.0-FTINY)*(i-2)) |
526 |
return(1); |
527 |
fvsum(nsum, nsum, newn, -1.0); |
528 |
} |
529 |
} |
530 |
return(0); |
531 |
} |
532 |
|
533 |
|
534 |
putface(ac, av) /* put out an N-sided polygon */ |
535 |
int ac; |
536 |
register char **av; |
537 |
{ |
538 |
VNDX vi; |
539 |
char *cp; |
540 |
register int i; |
541 |
|
542 |
if (nonplanar(ac, av)) { /* break into quads and triangles */ |
543 |
while (ac > 3) { |
544 |
if (!putquad(av[0], av[1], av[2], av[3])) |
545 |
return(0); |
546 |
ac -= 2; /* remove two vertices & rotate */ |
547 |
cp = av[0]; |
548 |
for (i = 0; i < ac-1; i++) |
549 |
av[i] = av[i+3]; |
550 |
av[i] = cp; |
551 |
} |
552 |
if (ac == 3 && !puttri(av[0], av[1], av[2])) |
553 |
return(0); |
554 |
return(1); |
555 |
} |
556 |
if ((cp = getmtl()) == NULL) |
557 |
return(-1); |
558 |
printf("\n%s polygon %s.%d\n", cp, getonm(), faceno); |
559 |
printf("0\n0\n%d\n", 3*ac); |
560 |
for (i = 0; i < ac; i++) { |
561 |
if (!cvtndx(vi, av[i])) |
562 |
return(0); |
563 |
pvect(vlist[vi[0]]); |
564 |
} |
565 |
return(1); |
566 |
} |
567 |
|
568 |
|
569 |
puttri(v1, v2, v3) /* put out a triangle */ |
570 |
char *v1, *v2, *v3; |
571 |
{ |
572 |
char *mod; |
573 |
VNDX v1i, v2i, v3i; |
574 |
BARYCCM bvecs; |
575 |
int texOK, patOK; |
576 |
|
577 |
if ((mod = getmtl()) == NULL) |
578 |
return(-1); |
579 |
|
580 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
581 |
return(0); |
582 |
/* compute barycentric coordinates */ |
583 |
texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0); |
584 |
#ifdef TEXMAPS |
585 |
patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0); |
586 |
#else |
587 |
patOK = 0; |
588 |
#endif |
589 |
if (texOK | patOK) |
590 |
if (comp_baryc(&bvecs, vlist[v1i[0]], vlist[v2i[0]], |
591 |
vlist[v3i[0]]) < 0) |
592 |
return(-1); |
593 |
/* put out texture (if any) */ |
594 |
if (texOK) { |
595 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
596 |
mod = TEXNAME; |
597 |
printf("4 dx dy dz %s\n", TCALNAME); |
598 |
printf("0\n16 "); |
599 |
put_baryc(&bvecs); |
600 |
printf("\t%14.12g %14.12g %14.12g\n", |
601 |
vnlist[v1i[2]][0], vnlist[v2i[2]][0], |
602 |
vnlist[v3i[2]][0]); |
603 |
printf("\t%14.12g %14.12g %14.12g\n", |
604 |
vnlist[v1i[2]][1], vnlist[v2i[2]][1], |
605 |
vnlist[v3i[2]][1]); |
606 |
printf("\t%14.12g %14.12g %14.12g\n", |
607 |
vnlist[v1i[2]][2], vnlist[v2i[2]][2], |
608 |
vnlist[v3i[2]][2]); |
609 |
} |
610 |
#ifdef TEXMAPS |
611 |
/* put out pattern (if any) */ |
612 |
if (patOK) { |
613 |
printf("\n%s colorpict %s\n", mod, PATNAME); |
614 |
mod = PATNAME; |
615 |
printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME); |
616 |
printf("0\n13 "); |
617 |
put_baryc(&bvecs); |
618 |
printf("\t%f %f %f\n", vtlist[v1i[1]][0], |
619 |
vtlist[v2i[1]][0], vtlist[v3i[1]][0]); |
620 |
printf("\t%f %f %f\n", vtlist[v1i[1]][1], |
621 |
vtlist[v2i[1]][1], vtlist[v3i[1]][1]); |
622 |
} |
623 |
#endif |
624 |
/* put out triangle */ |
625 |
printf("\n%s polygon %s.%d\n", mod, getonm(), faceno); |
626 |
printf("0\n0\n9\n"); |
627 |
pvect(vlist[v1i[0]]); |
628 |
pvect(vlist[v2i[0]]); |
629 |
pvect(vlist[v3i[0]]); |
630 |
|
631 |
return(1); |
632 |
} |
633 |
|
634 |
|
635 |
int |
636 |
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
637 |
register BARYCCM *bcm; |
638 |
FLOAT *v1, *v2, *v3; |
639 |
{ |
640 |
FLOAT *vt; |
641 |
FVECT va, vab, vcb; |
642 |
double d; |
643 |
int ax0, ax1; |
644 |
register int i, j; |
645 |
/* compute major axis */ |
646 |
for (i = 0; i < 3; i++) { |
647 |
vab[i] = v1[i] - v2[i]; |
648 |
vcb[i] = v3[i] - v2[i]; |
649 |
} |
650 |
fcross(va, vab, vcb); |
651 |
bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1; |
652 |
bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2; |
653 |
ax0 = (bcm->ax + 1) % 3; |
654 |
ax1 = (bcm->ax + 2) % 3; |
655 |
for (j = 0; j < 2; j++) { |
656 |
vab[0] = v1[ax0] - v2[ax0]; |
657 |
vcb[0] = v3[ax0] - v2[ax0]; |
658 |
vab[1] = v1[ax1] - v2[ax1]; |
659 |
vcb[1] = v3[ax1] - v2[ax1]; |
660 |
d = vcb[0]*vcb[0] + vcb[1]*vcb[1]; |
661 |
if (d <= FTINY) |
662 |
return(-1); |
663 |
d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d; |
664 |
va[0] = vab[0] - vcb[0]*d; |
665 |
va[1] = vab[1] - vcb[1]*d; |
666 |
d = va[0]*va[0] + va[1]*va[1]; |
667 |
if (d <= FTINY) |
668 |
return(-1); |
669 |
bcm->tm[j][0] = va[0] /= d; |
670 |
bcm->tm[j][1] = va[1] /= d; |
671 |
bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]); |
672 |
/* rotate vertices */ |
673 |
vt = v1; |
674 |
v1 = v2; |
675 |
v2 = v3; |
676 |
v3 = vt; |
677 |
} |
678 |
return(0); |
679 |
} |
680 |
|
681 |
|
682 |
put_baryc(bcm) /* put barycentric coord. vectors */ |
683 |
register BARYCCM *bcm; |
684 |
{ |
685 |
printf("\t%d\n", bcm->ax); |
686 |
printf("%14.8f %14.8f %14.8f\n", |
687 |
bcm->tm[0][0], bcm->tm[0][1], bcm->tm[0][2]); |
688 |
printf("%14.8f %14.8f %14.8f\n", |
689 |
bcm->tm[1][0], bcm->tm[1][1], bcm->tm[1][2]); |
690 |
} |
691 |
|
692 |
|
693 |
putquad(p0, p1, p3, p2) /* put out a quadrilateral */ |
694 |
char *p0, *p1, *p3, *p2; /* names correspond to binary pos. */ |
695 |
{ |
696 |
VNDX p0i, p1i, p2i, p3i; |
697 |
FVECT norm[4]; |
698 |
char *mod, *name; |
699 |
int axis; |
700 |
FVECT v1, v2, vc1, vc2; |
701 |
int ok1, ok2; |
702 |
|
703 |
#ifdef TEXMAPS |
704 |
/* also should output texture index coordinates, |
705 |
* which will require new .cal file |
706 |
*/ |
707 |
#endif |
708 |
if ((mod = getmtl()) == NULL) |
709 |
return(-1); |
710 |
name = getonm(); |
711 |
/* get actual indices */ |
712 |
if (!cvtndx(p0i,p0) || !cvtndx(p1i,p1) || |
713 |
!cvtndx(p2i,p2) || !cvtndx(p3i,p3)) |
714 |
return(0); |
715 |
/* compute exact normals */ |
716 |
fvsum(v1, vlist[p1i[0]], vlist[p0i[0]], -1.0); |
717 |
fvsum(v2, vlist[p2i[0]], vlist[p0i[0]], -1.0); |
718 |
fcross(vc1, v1, v2); |
719 |
ok1 = normalize(vc1) != 0.0; |
720 |
fvsum(v1, vlist[p2i[0]], vlist[p3i[0]], -1.0); |
721 |
fvsum(v2, vlist[p1i[0]], vlist[p3i[0]], -1.0); |
722 |
fcross(vc2, v1, v2); |
723 |
ok2 = normalize(vc2) != 0.0; |
724 |
if (!(ok1 | ok2)) |
725 |
return(-1); |
726 |
/* compute normal interpolation */ |
727 |
axis = norminterp(norm, p0i, p1i, p2i, p3i); |
728 |
|
729 |
/* put out quadrilateral? */ |
730 |
if (ok1 & ok2 && fabs(fdot(vc1,vc2)) >= 1.0-FTINY) { |
731 |
printf("\n%s ", mod); |
732 |
if (axis != -1) { |
733 |
printf("texfunc %s\n", TEXNAME); |
734 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
735 |
printf("0\n13\t%d\n", axis); |
736 |
pvect(norm[0]); |
737 |
pvect(norm[1]); |
738 |
pvect(norm[2]); |
739 |
fvsum(v1, norm[3], vc1, -0.5); |
740 |
fvsum(v1, v1, vc2, -0.5); |
741 |
pvect(v1); |
742 |
printf("\n%s ", TEXNAME); |
743 |
} |
744 |
printf("polygon %s.%d\n", name, faceno); |
745 |
printf("0\n0\n12\n"); |
746 |
pvect(vlist[p0i[0]]); |
747 |
pvect(vlist[p1i[0]]); |
748 |
pvect(vlist[p3i[0]]); |
749 |
pvect(vlist[p2i[0]]); |
750 |
return(1); |
751 |
} |
752 |
/* put out triangles? */ |
753 |
if (ok1) { |
754 |
printf("\n%s ", mod); |
755 |
if (axis != -1) { |
756 |
printf("texfunc %s\n", TEXNAME); |
757 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
758 |
printf("0\n13\t%d\n", axis); |
759 |
pvect(norm[0]); |
760 |
pvect(norm[1]); |
761 |
pvect(norm[2]); |
762 |
fvsum(v1, norm[3], vc1, -1.0); |
763 |
pvect(v1); |
764 |
printf("\n%s ", TEXNAME); |
765 |
} |
766 |
printf("polygon %s.%da\n", name, faceno); |
767 |
printf("0\n0\n9\n"); |
768 |
pvect(vlist[p0i[0]]); |
769 |
pvect(vlist[p1i[0]]); |
770 |
pvect(vlist[p2i[0]]); |
771 |
} |
772 |
if (ok2) { |
773 |
printf("\n%s ", mod); |
774 |
if (axis != -1) { |
775 |
printf("texfunc %s\n", TEXNAME); |
776 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
777 |
printf("0\n13\t%d\n", axis); |
778 |
pvect(norm[0]); |
779 |
pvect(norm[1]); |
780 |
pvect(norm[2]); |
781 |
fvsum(v2, norm[3], vc2, -1.0); |
782 |
pvect(v2); |
783 |
printf("\n%s ", TEXNAME); |
784 |
} |
785 |
printf("polygon %s.%db\n", name, faceno); |
786 |
printf("0\n0\n9\n"); |
787 |
pvect(vlist[p2i[0]]); |
788 |
pvect(vlist[p1i[0]]); |
789 |
pvect(vlist[p3i[0]]); |
790 |
} |
791 |
return(1); |
792 |
} |
793 |
|
794 |
|
795 |
int |
796 |
norminterp(resmat, p0i, p1i, p2i, p3i) /* compute normal interpolation */ |
797 |
register FVECT resmat[4]; |
798 |
register VNDX p0i, p1i, p2i, p3i; |
799 |
{ |
800 |
#define u ((ax+1)%3) |
801 |
#define v ((ax+2)%3) |
802 |
|
803 |
register int ax; |
804 |
MAT4 eqnmat; |
805 |
FVECT v1; |
806 |
register int i, j; |
807 |
|
808 |
#ifdef TEXMAPS |
809 |
/* also check for texture indices */ |
810 |
#endif |
811 |
if (flatten || !(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0)) |
812 |
return(-1); |
813 |
/* find dominant axis */ |
814 |
VCOPY(v1, vnlist[p0i[2]]); |
815 |
fvsum(v1, v1, vnlist[p1i[2]], 1.0); |
816 |
fvsum(v1, v1, vnlist[p2i[2]], 1.0); |
817 |
fvsum(v1, v1, vnlist[p3i[2]], 1.0); |
818 |
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
819 |
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
820 |
/* assign equation matrix */ |
821 |
eqnmat[0][0] = vlist[p0i[0]][u]*vlist[p0i[0]][v]; |
822 |
eqnmat[0][1] = vlist[p0i[0]][u]; |
823 |
eqnmat[0][2] = vlist[p0i[0]][v]; |
824 |
eqnmat[0][3] = 1.0; |
825 |
eqnmat[1][0] = vlist[p1i[0]][u]*vlist[p1i[0]][v]; |
826 |
eqnmat[1][1] = vlist[p1i[0]][u]; |
827 |
eqnmat[1][2] = vlist[p1i[0]][v]; |
828 |
eqnmat[1][3] = 1.0; |
829 |
eqnmat[2][0] = vlist[p2i[0]][u]*vlist[p2i[0]][v]; |
830 |
eqnmat[2][1] = vlist[p2i[0]][u]; |
831 |
eqnmat[2][2] = vlist[p2i[0]][v]; |
832 |
eqnmat[2][3] = 1.0; |
833 |
eqnmat[3][0] = vlist[p3i[0]][u]*vlist[p3i[0]][v]; |
834 |
eqnmat[3][1] = vlist[p3i[0]][u]; |
835 |
eqnmat[3][2] = vlist[p3i[0]][v]; |
836 |
eqnmat[3][3] = 1.0; |
837 |
/* invert matrix (solve system) */ |
838 |
if (!invmat4(eqnmat, eqnmat)) |
839 |
return(-1); /* no solution */ |
840 |
/* compute result matrix */ |
841 |
for (j = 0; j < 4; j++) |
842 |
for (i = 0; i < 3; i++) |
843 |
resmat[j][i] = eqnmat[j][0]*vnlist[p0i[2]][i] + |
844 |
eqnmat[j][1]*vnlist[p1i[2]][i] + |
845 |
eqnmat[j][2]*vnlist[p2i[2]][i] + |
846 |
eqnmat[j][3]*vnlist[p3i[2]][i]; |
847 |
#ifdef TEXMAPS |
848 |
/* compute result matrix for texture indices */ |
849 |
#endif |
850 |
return(ax); |
851 |
|
852 |
#undef u |
853 |
#undef v |
854 |
} |
855 |
|
856 |
|
857 |
freeverts() /* free all vertices */ |
858 |
{ |
859 |
if (nvs) { |
860 |
free((char *)vlist); |
861 |
nvs = 0; |
862 |
} |
863 |
if (nvts) { |
864 |
free((char *)vtlist); |
865 |
nvts = 0; |
866 |
} |
867 |
if (nvns) { |
868 |
free((char *)vnlist); |
869 |
nvns = 0; |
870 |
} |
871 |
} |
872 |
|
873 |
|
874 |
int |
875 |
newv(x, y, z) /* create a new vertex */ |
876 |
double x, y, z; |
877 |
{ |
878 |
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
879 |
if (nvs == 0) |
880 |
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
881 |
else |
882 |
vlist = (FVECT *)realloc((char *)vlist, |
883 |
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
884 |
if (vlist == NULL) { |
885 |
fprintf(stderr, |
886 |
"Out of memory while allocating vertex %d\n", nvs); |
887 |
exit(1); |
888 |
} |
889 |
} |
890 |
/* assign new vertex */ |
891 |
vlist[nvs][0] = x; |
892 |
vlist[nvs][1] = y; |
893 |
vlist[nvs][2] = z; |
894 |
return(++nvs); |
895 |
} |
896 |
|
897 |
|
898 |
int |
899 |
newvn(x, y, z) /* create a new vertex normal */ |
900 |
double x, y, z; |
901 |
{ |
902 |
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
903 |
if (nvns == 0) |
904 |
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
905 |
else |
906 |
vnlist = (FVECT *)realloc((char *)vnlist, |
907 |
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
908 |
if (vnlist == NULL) { |
909 |
fprintf(stderr, |
910 |
"Out of memory while allocating normal %d\n", nvns); |
911 |
exit(1); |
912 |
} |
913 |
} |
914 |
/* assign new normal */ |
915 |
vnlist[nvns][0] = x; |
916 |
vnlist[nvns][1] = y; |
917 |
vnlist[nvns][2] = z; |
918 |
if (normalize(vnlist[nvns]) == 0.0) |
919 |
return(0); |
920 |
return(++nvns); |
921 |
} |
922 |
|
923 |
|
924 |
int |
925 |
newvt(x, y) /* create a new texture map vertex */ |
926 |
double x, y; |
927 |
{ |
928 |
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
929 |
if (nvts == 0) |
930 |
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
931 |
else |
932 |
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
933 |
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
934 |
if (vtlist == NULL) { |
935 |
fprintf(stderr, |
936 |
"Out of memory while allocating texture vertex %d\n", |
937 |
nvts); |
938 |
exit(1); |
939 |
} |
940 |
} |
941 |
/* assign new vertex */ |
942 |
vtlist[nvts][0] = x; |
943 |
vtlist[nvts][1] = y; |
944 |
return(++nvts); |
945 |
} |
946 |
|
947 |
|
948 |
syntax(er) /* report syntax error and exit */ |
949 |
char *er; |
950 |
{ |
951 |
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
952 |
inpfile, lineno, er); |
953 |
exit(1); |
954 |
} |