| 1 |
#ifndef lint
|
| 2 |
static const char RCSid[] = "$Id: obj2rad.c,v 2.23 2004/04/23 16:20:56 greg Exp $";
|
| 3 |
#endif
|
| 4 |
/*
|
| 5 |
* Convert a Wavefront .obj file to Radiance format.
|
| 6 |
*
|
| 7 |
* Currently, we support only polygonal geometry. Non-planar
|
| 8 |
* faces are broken rather haphazardly into triangles.
|
| 9 |
* Also, texture map indices only work for triangles, though
|
| 10 |
* I'm not sure they work correctly. (Taken out -- see TEXMAPS defines.)
|
| 11 |
*/
|
| 12 |
|
| 13 |
#include <stdlib.h>
|
| 14 |
#include <stdio.h>
|
| 15 |
#include <ctype.h>
|
| 16 |
|
| 17 |
#include "rtmath.h"
|
| 18 |
#include "rtio.h"
|
| 19 |
#include "resolu.h"
|
| 20 |
#include "trans.h"
|
| 21 |
#include "tmesh.h"
|
| 22 |
|
| 23 |
|
| 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 pvect(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2])
|
| 30 |
|
| 31 |
FVECT *vlist; /* our vertex list */
|
| 32 |
int nvs; /* number of vertices in our list */
|
| 33 |
FVECT *vnlist; /* vertex normal list */
|
| 34 |
int nvns;
|
| 35 |
RREAL (*vtlist)[2]; /* map vertex list */
|
| 36 |
int nvts;
|
| 37 |
|
| 38 |
int ndegen = 0; /* count of degenerate faces */
|
| 39 |
|
| 40 |
typedef int VNDX[3]; /* vertex index (point,map,normal) */
|
| 41 |
|
| 42 |
#define CHUNKSIZ 1024 /* vertex allocation chunk size */
|
| 43 |
|
| 44 |
#define MAXARG 512 /* maximum # arguments in a statement */
|
| 45 |
|
| 46 |
/* qualifiers */
|
| 47 |
#define Q_MTL 0
|
| 48 |
#define Q_MAP 1
|
| 49 |
#define Q_GRP 2
|
| 50 |
#define Q_OBJ 3
|
| 51 |
#define Q_FAC 4
|
| 52 |
#define NQUALS 5
|
| 53 |
|
| 54 |
char *qname[NQUALS] = {
|
| 55 |
"Material",
|
| 56 |
"Map",
|
| 57 |
"Group",
|
| 58 |
"Object",
|
| 59 |
"Face",
|
| 60 |
};
|
| 61 |
|
| 62 |
QLIST qlist = {NQUALS, qname};
|
| 63 |
/* valid qualifier ids */
|
| 64 |
IDLIST qual[NQUALS];
|
| 65 |
/* mapping rules */
|
| 66 |
RULEHD *ourmapping = NULL;
|
| 67 |
|
| 68 |
char *defmat = DEFMAT; /* default (starting) material name */
|
| 69 |
char *defobj = DEFOBJ; /* default (starting) object name */
|
| 70 |
|
| 71 |
int flatten = 0; /* discard surface normal information */
|
| 72 |
|
| 73 |
char mapname[128]; /* current picture file */
|
| 74 |
char matname[64]; /* current material name */
|
| 75 |
char group[16][32]; /* current group names */
|
| 76 |
char objname[128]; /* current object name */
|
| 77 |
char *inpfile; /* input file name */
|
| 78 |
int lineno; /* current line number */
|
| 79 |
int faceno; /* current face number */
|
| 80 |
|
| 81 |
static void getnames(FILE *fp);
|
| 82 |
static void convert(FILE *fp);
|
| 83 |
static int getstmt(char *av[MAXARG], FILE *fp);
|
| 84 |
static char * getmtl(void);
|
| 85 |
static char * getonm(void);
|
| 86 |
static int matchrule(RULEHD *rp);
|
| 87 |
static int cvtndx(VNDX vi, char *vs);
|
| 88 |
static int nonplanar(int ac, char **av);
|
| 89 |
static int putface(int ac, char **av);
|
| 90 |
static int puttri(char *v1, char *v2, char *v3);
|
| 91 |
static void freeverts(void);
|
| 92 |
static int newv(double x, double y, double z);
|
| 93 |
static int newvn(double x, double y, double z);
|
| 94 |
static int newvt(double x, double y);
|
| 95 |
static void syntax(char *er);
|
| 96 |
|
| 97 |
|
| 98 |
int
|
| 99 |
main( /* read in .obj file and convert */
|
| 100 |
int argc,
|
| 101 |
char *argv[]
|
| 102 |
)
|
| 103 |
{
|
| 104 |
int donames = 0;
|
| 105 |
int i;
|
| 106 |
|
| 107 |
for (i = 1; i < argc && argv[i][0] == '-'; i++)
|
| 108 |
switch (argv[i][1]) {
|
| 109 |
case 'o': /* object name */
|
| 110 |
defobj = argv[++i];
|
| 111 |
break;
|
| 112 |
case 'n': /* just produce name list */
|
| 113 |
donames++;
|
| 114 |
break;
|
| 115 |
case 'm': /* use custom mapfile */
|
| 116 |
ourmapping = getmapping(argv[++i], &qlist);
|
| 117 |
break;
|
| 118 |
case 'f': /* flatten surfaces */
|
| 119 |
flatten++;
|
| 120 |
break;
|
| 121 |
default:
|
| 122 |
goto userr;
|
| 123 |
}
|
| 124 |
if ((i > argc) | (i < argc-1))
|
| 125 |
goto userr;
|
| 126 |
if (i == argc)
|
| 127 |
inpfile = "<stdin>";
|
| 128 |
else if (freopen(inpfile=argv[i], "r", stdin) == NULL) {
|
| 129 |
fprintf(stderr, "%s: cannot open\n", inpfile);
|
| 130 |
exit(1);
|
| 131 |
}
|
| 132 |
if (donames) { /* scan for ids */
|
| 133 |
getnames(stdin);
|
| 134 |
printf("filename \"%s\"\n", inpfile);
|
| 135 |
printf("filetype \"Wavefront\"\n");
|
| 136 |
write_quals(&qlist, qual, stdout);
|
| 137 |
printf("qualifier %s begin\n", qlist.qual[Q_FAC]);
|
| 138 |
printf("[%d:%d]\n", 1, faceno);
|
| 139 |
printf("end\n");
|
| 140 |
} else { /* translate file */
|
| 141 |
printf("# ");
|
| 142 |
printargs(argc, argv, stdout);
|
| 143 |
convert(stdin);
|
| 144 |
}
|
| 145 |
if (ndegen)
|
| 146 |
printf("# %d degenerate faces\n", ndegen);
|
| 147 |
exit(0);
|
| 148 |
userr:
|
| 149 |
fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n][-f] [file.obj]\n",
|
| 150 |
argv[0]);
|
| 151 |
exit(1);
|
| 152 |
}
|
| 153 |
|
| 154 |
|
| 155 |
void
|
| 156 |
getnames( /* get valid qualifier names */
|
| 157 |
FILE *fp
|
| 158 |
)
|
| 159 |
{
|
| 160 |
char *argv[MAXARG];
|
| 161 |
int argc;
|
| 162 |
ID tmpid;
|
| 163 |
register int i;
|
| 164 |
|
| 165 |
while ( (argc = getstmt(argv, fp)) )
|
| 166 |
switch (argv[0][0]) {
|
| 167 |
case 'f': /* face */
|
| 168 |
if (!argv[0][1])
|
| 169 |
faceno++;
|
| 170 |
break;
|
| 171 |
case 'u':
|
| 172 |
if (!strcmp(argv[0], "usemtl")) { /* material */
|
| 173 |
if (argc < 2)
|
| 174 |
break; /* not fatal */
|
| 175 |
tmpid.number = 0;
|
| 176 |
tmpid.name = argv[1];
|
| 177 |
findid(&qual[Q_MTL], &tmpid, 1);
|
| 178 |
} else if (!strcmp(argv[0], "usemap")) {/* map */
|
| 179 |
if (argc < 2 || !strcmp(argv[1], "off"))
|
| 180 |
break; /* not fatal */
|
| 181 |
tmpid.number = 0;
|
| 182 |
tmpid.name = argv[1];
|
| 183 |
findid(&qual[Q_MAP], &tmpid, 1);
|
| 184 |
}
|
| 185 |
break;
|
| 186 |
case 'o': /* object name */
|
| 187 |
if (argv[0][1] || argc < 2)
|
| 188 |
break;
|
| 189 |
tmpid.number = 0;
|
| 190 |
tmpid.name = argv[1];
|
| 191 |
findid(&qual[Q_OBJ], &tmpid, 1);
|
| 192 |
break;
|
| 193 |
case 'g': /* group name(s) */
|
| 194 |
if (argv[0][1])
|
| 195 |
break;
|
| 196 |
tmpid.number = 0;
|
| 197 |
for (i = 1; i < argc; i++) {
|
| 198 |
tmpid.name = argv[i];
|
| 199 |
findid(&qual[Q_GRP], &tmpid, 1);
|
| 200 |
}
|
| 201 |
break;
|
| 202 |
}
|
| 203 |
}
|
| 204 |
|
| 205 |
|
| 206 |
void
|
| 207 |
convert( /* convert a T-mesh */
|
| 208 |
FILE *fp
|
| 209 |
)
|
| 210 |
{
|
| 211 |
char *argv[MAXARG];
|
| 212 |
int argc;
|
| 213 |
int nstats, nunknown;
|
| 214 |
register int i;
|
| 215 |
|
| 216 |
nstats = nunknown = 0;
|
| 217 |
/* scan until EOF */
|
| 218 |
while ( (argc = getstmt(argv, fp)) ) {
|
| 219 |
switch (argv[0][0]) {
|
| 220 |
case 'v': /* vertex */
|
| 221 |
switch (argv[0][1]) {
|
| 222 |
case '\0': /* point */
|
| 223 |
if (badarg(argc-1,argv+1,"fff"))
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| 224 |
syntax("Bad vertex");
|
| 225 |
newv(atof(argv[1]), atof(argv[2]),
|
| 226 |
atof(argv[3]));
|
| 227 |
break;
|
| 228 |
case 'n': /* normal */
|
| 229 |
if (argv[0][2])
|
| 230 |
goto unknown;
|
| 231 |
if (badarg(argc-1,argv+1,"fff"))
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| 232 |
syntax("Bad normal");
|
| 233 |
if (!newvn(atof(argv[1]), atof(argv[2]),
|
| 234 |
atof(argv[3])))
|
| 235 |
syntax("Zero normal");
|
| 236 |
break;
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| 237 |
case 't': /* texture map */
|
| 238 |
if (argv[0][2])
|
| 239 |
goto unknown;
|
| 240 |
if (badarg(argc-1,argv+1,"ff"))
|
| 241 |
goto unknown;
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| 242 |
newvt(atof(argv[1]), atof(argv[2]));
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| 243 |
break;
|
| 244 |
default:
|
| 245 |
goto unknown;
|
| 246 |
}
|
| 247 |
break;
|
| 248 |
case 'f': /* face */
|
| 249 |
if (argv[0][1])
|
| 250 |
goto unknown;
|
| 251 |
faceno++;
|
| 252 |
switch (argc-1) {
|
| 253 |
case 0: case 1: case 2:
|
| 254 |
syntax("Too few vertices");
|
| 255 |
break;
|
| 256 |
case 3:
|
| 257 |
if (!puttri(argv[1], argv[2], argv[3]))
|
| 258 |
syntax("Bad triangle");
|
| 259 |
break;
|
| 260 |
default:
|
| 261 |
if (!putface(argc-1, argv+1))
|
| 262 |
syntax("Bad face");
|
| 263 |
break;
|
| 264 |
}
|
| 265 |
break;
|
| 266 |
case 'u':
|
| 267 |
if (!strcmp(argv[0], "usemtl")) { /* material */
|
| 268 |
if (argc < 2)
|
| 269 |
break; /* not fatal */
|
| 270 |
strcpy(matname, argv[1]);
|
| 271 |
} else if (!strcmp(argv[0], "usemap")) {/* map */
|
| 272 |
if (argc < 2)
|
| 273 |
break; /* not fatal */
|
| 274 |
if (!strcmp(argv[1], "off"))
|
| 275 |
mapname[0] = '\0';
|
| 276 |
else
|
| 277 |
sprintf(mapname, "%s.pic", argv[1]);
|
| 278 |
} else
|
| 279 |
goto unknown;
|
| 280 |
break;
|
| 281 |
case 'o': /* object name */
|
| 282 |
if (argv[0][1])
|
| 283 |
goto unknown;
|
| 284 |
if (argc < 2)
|
| 285 |
break; /* not fatal */
|
| 286 |
strcpy(objname, argv[1]);
|
| 287 |
break;
|
| 288 |
case 'g': /* group name(s) */
|
| 289 |
if (argv[0][1])
|
| 290 |
goto unknown;
|
| 291 |
for (i = 1; i < argc; i++)
|
| 292 |
strcpy(group[i-1], argv[i]);
|
| 293 |
group[i-1][0] = '\0';
|
| 294 |
break;
|
| 295 |
case '#': /* comment */
|
| 296 |
printargs(argc, argv, stdout);
|
| 297 |
break;
|
| 298 |
default:; /* something we don't deal with */
|
| 299 |
unknown:
|
| 300 |
nunknown++;
|
| 301 |
break;
|
| 302 |
}
|
| 303 |
nstats++;
|
| 304 |
}
|
| 305 |
printf("\n# Done processing file: %s\n", inpfile);
|
| 306 |
printf("# %d lines, %d statements, %d unrecognized\n",
|
| 307 |
lineno, nstats, nunknown);
|
| 308 |
}
|
| 309 |
|
| 310 |
|
| 311 |
int
|
| 312 |
getstmt( /* read the next statement from fp */
|
| 313 |
register char *av[MAXARG],
|
| 314 |
FILE *fp
|
| 315 |
)
|
| 316 |
{
|
| 317 |
static char sbuf[MAXARG*16];
|
| 318 |
register char *cp;
|
| 319 |
register int i;
|
| 320 |
|
| 321 |
do {
|
| 322 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL)
|
| 323 |
return(0);
|
| 324 |
i = 0;
|
| 325 |
for ( ; ; ) {
|
| 326 |
while (isspace(*cp) || *cp == '\\') {
|
| 327 |
if (*cp == '\n')
|
| 328 |
lineno++;
|
| 329 |
*cp++ = '\0';
|
| 330 |
}
|
| 331 |
if (!*cp)
|
| 332 |
break;
|
| 333 |
if (i >= MAXARG-1) {
|
| 334 |
fprintf(stderr,
|
| 335 |
"warning: line %d: too many arguments (limit %d)\n",
|
| 336 |
lineno+1, MAXARG-1);
|
| 337 |
break;
|
| 338 |
}
|
| 339 |
av[i++] = cp;
|
| 340 |
while (*++cp && !isspace(*cp))
|
| 341 |
;
|
| 342 |
}
|
| 343 |
av[i] = NULL;
|
| 344 |
lineno++;
|
| 345 |
} while (!i);
|
| 346 |
|
| 347 |
return(i);
|
| 348 |
}
|
| 349 |
|
| 350 |
|
| 351 |
char *
|
| 352 |
getmtl(void) /* figure material for this face */
|
| 353 |
{
|
| 354 |
register RULEHD *rp = ourmapping;
|
| 355 |
|
| 356 |
if (rp == NULL) { /* no rule set */
|
| 357 |
if (matname[0])
|
| 358 |
return(matname);
|
| 359 |
if (group[0][0])
|
| 360 |
return(group[0]);
|
| 361 |
return(defmat);
|
| 362 |
}
|
| 363 |
/* check for match */
|
| 364 |
do {
|
| 365 |
if (matchrule(rp)) {
|
| 366 |
if (!strcmp(rp->mnam, VOIDID))
|
| 367 |
return(NULL); /* match is null */
|
| 368 |
return(rp->mnam);
|
| 369 |
}
|
| 370 |
rp = rp->next;
|
| 371 |
} while (rp != NULL);
|
| 372 |
/* no match found */
|
| 373 |
return(NULL);
|
| 374 |
}
|
| 375 |
|
| 376 |
|
| 377 |
char *
|
| 378 |
getonm(void) /* invent a good name for object */
|
| 379 |
{
|
| 380 |
static char name[64];
|
| 381 |
register char *cp1, *cp2;
|
| 382 |
register int i;
|
| 383 |
/* check for preset */
|
| 384 |
if (objname[0])
|
| 385 |
return(objname);
|
| 386 |
if (!group[0][0])
|
| 387 |
return(defobj);
|
| 388 |
cp1 = name; /* else make name out of groups */
|
| 389 |
for (i = 0; group[i][0]; i++) {
|
| 390 |
cp2 = group[i];
|
| 391 |
if (cp1 > name)
|
| 392 |
*cp1++ = '.';
|
| 393 |
while ( (*cp1 = *cp2++) )
|
| 394 |
if (++cp1 >= name+sizeof(name)-2) {
|
| 395 |
*cp1 = '\0';
|
| 396 |
return(name);
|
| 397 |
}
|
| 398 |
}
|
| 399 |
return(name);
|
| 400 |
}
|
| 401 |
|
| 402 |
|
| 403 |
int
|
| 404 |
matchrule( /* check for a match on this rule */
|
| 405 |
register RULEHD *rp
|
| 406 |
)
|
| 407 |
{
|
| 408 |
ID tmpid;
|
| 409 |
int gotmatch;
|
| 410 |
register int i;
|
| 411 |
|
| 412 |
if (rp->qflg & FL(Q_MTL)) {
|
| 413 |
if (!matname[0])
|
| 414 |
return(0);
|
| 415 |
tmpid.number = 0;
|
| 416 |
tmpid.name = matname;
|
| 417 |
if (!matchid(&tmpid, &idm(rp)[Q_MTL]))
|
| 418 |
return(0);
|
| 419 |
}
|
| 420 |
if (rp->qflg & FL(Q_MAP)) {
|
| 421 |
if (!mapname[0])
|
| 422 |
return(0);
|
| 423 |
tmpid.number = 0;
|
| 424 |
tmpid.name = mapname;
|
| 425 |
if (!matchid(&tmpid, &idm(rp)[Q_MAP]))
|
| 426 |
return(0);
|
| 427 |
}
|
| 428 |
if (rp->qflg & FL(Q_GRP)) {
|
| 429 |
tmpid.number = 0;
|
| 430 |
gotmatch = 0;
|
| 431 |
for (i = 0; group[i][0]; i++) {
|
| 432 |
tmpid.name = group[i];
|
| 433 |
gotmatch |= matchid(&tmpid, &idm(rp)[Q_GRP]);
|
| 434 |
}
|
| 435 |
if (!gotmatch)
|
| 436 |
return(0);
|
| 437 |
}
|
| 438 |
if (rp->qflg & FL(Q_OBJ)) {
|
| 439 |
if (!objname[0])
|
| 440 |
return(0);
|
| 441 |
tmpid.number = 0;
|
| 442 |
tmpid.name = objname;
|
| 443 |
if (!matchid(&tmpid, &idm(rp)[Q_OBJ]))
|
| 444 |
return(0);
|
| 445 |
}
|
| 446 |
if (rp->qflg & FL(Q_FAC)) {
|
| 447 |
tmpid.name = NULL;
|
| 448 |
tmpid.number = faceno;
|
| 449 |
if (!matchid(&tmpid, &idm(rp)[Q_FAC]))
|
| 450 |
return(0);
|
| 451 |
}
|
| 452 |
return(1);
|
| 453 |
}
|
| 454 |
|
| 455 |
|
| 456 |
int
|
| 457 |
cvtndx( /* convert vertex string to index */
|
| 458 |
register VNDX vi,
|
| 459 |
register char *vs
|
| 460 |
)
|
| 461 |
{
|
| 462 |
/* get point */
|
| 463 |
vi[0] = atoi(vs);
|
| 464 |
if (vi[0] > 0) {
|
| 465 |
if (vi[0]-- > nvs)
|
| 466 |
return(0);
|
| 467 |
} else if (vi[0] < 0) {
|
| 468 |
vi[0] += nvs;
|
| 469 |
if (vi[0] < 0)
|
| 470 |
return(0);
|
| 471 |
} else
|
| 472 |
return(0);
|
| 473 |
/* get map */
|
| 474 |
while (*vs)
|
| 475 |
if (*vs++ == '/')
|
| 476 |
break;
|
| 477 |
vi[1] = atoi(vs);
|
| 478 |
if (vi[1] > 0) {
|
| 479 |
if (vi[1]-- > nvts)
|
| 480 |
return(0);
|
| 481 |
} else if (vi[1] < 0) {
|
| 482 |
vi[1] += nvts;
|
| 483 |
if (vi[1] < 0)
|
| 484 |
return(0);
|
| 485 |
} else
|
| 486 |
vi[1] = -1;
|
| 487 |
/* get normal */
|
| 488 |
while (*vs)
|
| 489 |
if (*vs++ == '/')
|
| 490 |
break;
|
| 491 |
vi[2] = atoi(vs);
|
| 492 |
if (vi[2] > 0) {
|
| 493 |
if (vi[2]-- > nvns)
|
| 494 |
return(0);
|
| 495 |
} else if (vi[2] < 0) {
|
| 496 |
vi[2] += nvns;
|
| 497 |
if (vi[2] < 0)
|
| 498 |
return(0);
|
| 499 |
} else
|
| 500 |
vi[2] = -1;
|
| 501 |
return(1);
|
| 502 |
}
|
| 503 |
|
| 504 |
|
| 505 |
int
|
| 506 |
nonplanar( /* are vertices non-planar? */
|
| 507 |
register int ac,
|
| 508 |
register char **av
|
| 509 |
)
|
| 510 |
{
|
| 511 |
VNDX vi;
|
| 512 |
RREAL *p0, *p1;
|
| 513 |
FVECT v1, v2, nsum, newn;
|
| 514 |
double d;
|
| 515 |
register int i;
|
| 516 |
|
| 517 |
if (!cvtndx(vi, av[0]))
|
| 518 |
return(0);
|
| 519 |
if (!flatten && vi[2] >= 0)
|
| 520 |
return(1); /* has interpolated normals */
|
| 521 |
if (ac < 4)
|
| 522 |
return(0); /* it's a triangle! */
|
| 523 |
/* set up */
|
| 524 |
p0 = vlist[vi[0]];
|
| 525 |
if (!cvtndx(vi, av[1]))
|
| 526 |
return(0); /* error gets caught later */
|
| 527 |
nsum[0] = nsum[1] = nsum[2] = 0.;
|
| 528 |
p1 = vlist[vi[0]];
|
| 529 |
fvsum(v2, p1, p0, -1.0);
|
| 530 |
for (i = 2; i < ac; i++) {
|
| 531 |
VCOPY(v1, v2);
|
| 532 |
if (!cvtndx(vi, av[i]))
|
| 533 |
return(0);
|
| 534 |
p1 = vlist[vi[0]];
|
| 535 |
fvsum(v2, p1, p0, -1.0);
|
| 536 |
fcross(newn, v1, v2);
|
| 537 |
if (normalize(newn) == 0.0) {
|
| 538 |
if (i < 3)
|
| 539 |
return(1); /* can't deal with this */
|
| 540 |
fvsum(nsum, nsum, nsum, 1./(i-2));
|
| 541 |
continue;
|
| 542 |
}
|
| 543 |
d = fdot(newn,nsum);
|
| 544 |
if (d >= 0) {
|
| 545 |
if (d < (1.0-FTINY)*(i-2))
|
| 546 |
return(1);
|
| 547 |
fvsum(nsum, nsum, newn, 1.0);
|
| 548 |
} else {
|
| 549 |
if (d > -(1.0-FTINY)*(i-2))
|
| 550 |
return(1);
|
| 551 |
fvsum(nsum, nsum, newn, -1.0);
|
| 552 |
}
|
| 553 |
}
|
| 554 |
return(0);
|
| 555 |
}
|
| 556 |
|
| 557 |
|
| 558 |
int
|
| 559 |
putface( /* put out an N-sided polygon */
|
| 560 |
int ac,
|
| 561 |
register char **av
|
| 562 |
)
|
| 563 |
{
|
| 564 |
VNDX vi;
|
| 565 |
char *cp;
|
| 566 |
register int i;
|
| 567 |
|
| 568 |
if (nonplanar(ac, av)) { /* break into triangles */
|
| 569 |
while (ac > 2) {
|
| 570 |
if (!puttri(av[0], av[1], av[2]))
|
| 571 |
return(0);
|
| 572 |
ac--; /* remove vertex & rotate */
|
| 573 |
cp = av[0];
|
| 574 |
for (i = 0; i < ac-1; i++)
|
| 575 |
av[i] = av[i+2];
|
| 576 |
av[i] = cp;
|
| 577 |
}
|
| 578 |
return(1);
|
| 579 |
}
|
| 580 |
if ((cp = getmtl()) == NULL)
|
| 581 |
return(0);
|
| 582 |
printf("\n%s polygon %s.%d\n", cp, getonm(), faceno);
|
| 583 |
printf("0\n0\n%d\n", 3*ac);
|
| 584 |
for (i = 0; i < ac; i++) {
|
| 585 |
if (!cvtndx(vi, av[i]))
|
| 586 |
return(0);
|
| 587 |
pvect(vlist[vi[0]]);
|
| 588 |
}
|
| 589 |
return(1);
|
| 590 |
}
|
| 591 |
|
| 592 |
|
| 593 |
int
|
| 594 |
puttri( /* put out a triangle */
|
| 595 |
char *v1,
|
| 596 |
char *v2,
|
| 597 |
char *v3
|
| 598 |
)
|
| 599 |
{
|
| 600 |
char *mod;
|
| 601 |
VNDX v1i, v2i, v3i;
|
| 602 |
BARYCCM bvecs;
|
| 603 |
RREAL bcoor[3][3];
|
| 604 |
int texOK = 0, patOK;
|
| 605 |
int flatness;
|
| 606 |
register int i;
|
| 607 |
|
| 608 |
if ((mod = getmtl()) == NULL)
|
| 609 |
return(0);
|
| 610 |
|
| 611 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3))
|
| 612 |
return(0);
|
| 613 |
/* compute barycentric coordinates */
|
| 614 |
if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0)
|
| 615 |
flatness = flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]],
|
| 616 |
vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]]);
|
| 617 |
else
|
| 618 |
flatness = ISFLAT;
|
| 619 |
|
| 620 |
switch (flatness) {
|
| 621 |
case DEGEN: /* zero area */
|
| 622 |
ndegen++;
|
| 623 |
return(-1);
|
| 624 |
case RVFLAT: /* reversed normals, but flat */
|
| 625 |
case ISFLAT: /* smoothing unnecessary */
|
| 626 |
texOK = 0;
|
| 627 |
break;
|
| 628 |
case RVBENT: /* reversed normals with smoothing */
|
| 629 |
case ISBENT: /* proper smoothing */
|
| 630 |
texOK = 1;
|
| 631 |
break;
|
| 632 |
}
|
| 633 |
if (flatten)
|
| 634 |
texOK = 0;
|
| 635 |
#ifdef TEXMAPS
|
| 636 |
patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0);
|
| 637 |
#else
|
| 638 |
patOK = 0;
|
| 639 |
#endif
|
| 640 |
if (texOK | patOK)
|
| 641 |
if (comp_baryc(&bvecs, vlist[v1i[0]], vlist[v2i[0]],
|
| 642 |
vlist[v3i[0]]) < 0)
|
| 643 |
texOK = patOK = 0;
|
| 644 |
/* put out texture (if any) */
|
| 645 |
if (texOK) {
|
| 646 |
printf("\n%s texfunc %s\n", mod, TEXNAME);
|
| 647 |
mod = TEXNAME;
|
| 648 |
printf("4 dx dy dz %s\n", TCALNAME);
|
| 649 |
printf("0\n");
|
| 650 |
for (i = 0; i < 3; i++) {
|
| 651 |
bcoor[i][0] = vnlist[v1i[2]][i];
|
| 652 |
bcoor[i][1] = vnlist[v2i[2]][i];
|
| 653 |
bcoor[i][2] = vnlist[v3i[2]][i];
|
| 654 |
}
|
| 655 |
put_baryc(&bvecs, bcoor, 3);
|
| 656 |
}
|
| 657 |
#ifdef TEXMAPS
|
| 658 |
/* put out pattern (if any) */
|
| 659 |
if (patOK) {
|
| 660 |
printf("\n%s colorpict %s\n", mod, PATNAME);
|
| 661 |
mod = PATNAME;
|
| 662 |
printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME);
|
| 663 |
printf("0\n");
|
| 664 |
for (i = 0; i < 2; i++) {
|
| 665 |
bcoor[i][0] = vtlist[v1i[1]][i];
|
| 666 |
bcoor[i][1] = vtlist[v2i[1]][i];
|
| 667 |
bcoor[i][2] = vtlist[v3i[1]][i];
|
| 668 |
}
|
| 669 |
put_baryc(&bvecs, bcoor, 2);
|
| 670 |
}
|
| 671 |
#endif
|
| 672 |
/* put out (reversed) triangle */
|
| 673 |
printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
|
| 674 |
printf("0\n0\n9\n");
|
| 675 |
if (flatness == RVFLAT || flatness == RVBENT) {
|
| 676 |
pvect(vlist[v3i[0]]);
|
| 677 |
pvect(vlist[v2i[0]]);
|
| 678 |
pvect(vlist[v1i[0]]);
|
| 679 |
} else {
|
| 680 |
pvect(vlist[v1i[0]]);
|
| 681 |
pvect(vlist[v2i[0]]);
|
| 682 |
pvect(vlist[v3i[0]]);
|
| 683 |
}
|
| 684 |
return(1);
|
| 685 |
}
|
| 686 |
|
| 687 |
|
| 688 |
void
|
| 689 |
freeverts(void) /* free all vertices */
|
| 690 |
{
|
| 691 |
if (nvs) {
|
| 692 |
free((void *)vlist);
|
| 693 |
nvs = 0;
|
| 694 |
}
|
| 695 |
if (nvts) {
|
| 696 |
free((void *)vtlist);
|
| 697 |
nvts = 0;
|
| 698 |
}
|
| 699 |
if (nvns) {
|
| 700 |
free((void *)vnlist);
|
| 701 |
nvns = 0;
|
| 702 |
}
|
| 703 |
}
|
| 704 |
|
| 705 |
|
| 706 |
int
|
| 707 |
newv( /* create a new vertex */
|
| 708 |
double x,
|
| 709 |
double y,
|
| 710 |
double z
|
| 711 |
)
|
| 712 |
{
|
| 713 |
if (!(nvs%CHUNKSIZ)) { /* allocate next block */
|
| 714 |
if (nvs == 0)
|
| 715 |
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
|
| 716 |
else
|
| 717 |
vlist = (FVECT *)realloc((void *)vlist,
|
| 718 |
(nvs+CHUNKSIZ)*sizeof(FVECT));
|
| 719 |
if (vlist == NULL) {
|
| 720 |
fprintf(stderr,
|
| 721 |
"Out of memory while allocating vertex %d\n", nvs);
|
| 722 |
exit(1);
|
| 723 |
}
|
| 724 |
}
|
| 725 |
/* assign new vertex */
|
| 726 |
vlist[nvs][0] = x;
|
| 727 |
vlist[nvs][1] = y;
|
| 728 |
vlist[nvs][2] = z;
|
| 729 |
return(++nvs);
|
| 730 |
}
|
| 731 |
|
| 732 |
|
| 733 |
int
|
| 734 |
newvn( /* create a new vertex normal */
|
| 735 |
double x,
|
| 736 |
double y,
|
| 737 |
double z
|
| 738 |
)
|
| 739 |
{
|
| 740 |
if (!(nvns%CHUNKSIZ)) { /* allocate next block */
|
| 741 |
if (nvns == 0)
|
| 742 |
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
|
| 743 |
else
|
| 744 |
vnlist = (FVECT *)realloc((void *)vnlist,
|
| 745 |
(nvns+CHUNKSIZ)*sizeof(FVECT));
|
| 746 |
if (vnlist == NULL) {
|
| 747 |
fprintf(stderr,
|
| 748 |
"Out of memory while allocating normal %d\n", nvns);
|
| 749 |
exit(1);
|
| 750 |
}
|
| 751 |
}
|
| 752 |
/* assign new normal */
|
| 753 |
vnlist[nvns][0] = x;
|
| 754 |
vnlist[nvns][1] = y;
|
| 755 |
vnlist[nvns][2] = z;
|
| 756 |
if (normalize(vnlist[nvns]) == 0.0)
|
| 757 |
return(0);
|
| 758 |
return(++nvns);
|
| 759 |
}
|
| 760 |
|
| 761 |
|
| 762 |
int
|
| 763 |
newvt( /* create a new texture map vertex */
|
| 764 |
double x,
|
| 765 |
double y
|
| 766 |
)
|
| 767 |
{
|
| 768 |
if (!(nvts%CHUNKSIZ)) { /* allocate next block */
|
| 769 |
if (nvts == 0)
|
| 770 |
vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL));
|
| 771 |
else
|
| 772 |
vtlist = (RREAL (*)[2])realloc((void *)vtlist,
|
| 773 |
(nvts+CHUNKSIZ)*2*sizeof(RREAL));
|
| 774 |
if (vtlist == NULL) {
|
| 775 |
fprintf(stderr,
|
| 776 |
"Out of memory while allocating texture vertex %d\n",
|
| 777 |
nvts);
|
| 778 |
exit(1);
|
| 779 |
}
|
| 780 |
}
|
| 781 |
/* assign new vertex */
|
| 782 |
vtlist[nvts][0] = x;
|
| 783 |
vtlist[nvts][1] = y;
|
| 784 |
return(++nvts);
|
| 785 |
}
|
| 786 |
|
| 787 |
|
| 788 |
void
|
| 789 |
syntax( /* report syntax error and exit */
|
| 790 |
char *er
|
| 791 |
)
|
| 792 |
{
|
| 793 |
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n",
|
| 794 |
inpfile, lineno, er);
|
| 795 |
exit(1);
|
| 796 |
}
|
