| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: obj2rad.c,v 2.31 2020/01/28 21:18:02 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 <ctype.h> |
| 15 |
|
| 16 |
#include "rtmath.h" |
| 17 |
#include "rtio.h" |
| 18 |
#include "resolu.h" |
| 19 |
#include "trans.h" |
| 20 |
#include "tmesh.h" |
| 21 |
|
| 22 |
|
| 23 |
#define PATNAME "M-pat" /* mesh pattern name (reused) */ |
| 24 |
#define TEXNAME "M-nor" /* mesh texture name (reused) */ |
| 25 |
#define DEFOBJ "unnamed" /* default object name */ |
| 26 |
#define DEFMAT "white" /* default material name */ |
| 27 |
|
| 28 |
#define pvect(v) printf(" %18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
| 29 |
|
| 30 |
FVECT *vlist; /* our vertex list */ |
| 31 |
int nvs; /* number of vertices in our list */ |
| 32 |
FVECT *vnlist; /* vertex normal list */ |
| 33 |
int nvns; |
| 34 |
RREAL (*vtlist)[2]; /* map vertex list */ |
| 35 |
int nvts; |
| 36 |
|
| 37 |
int ndegen = 0; /* count of degenerate faces */ |
| 38 |
int n0norm = 0; /* count of zero normals */ |
| 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[256]; /* current picture file */ |
| 74 |
char matname[256]; /* current material name */ |
| 75 |
char group[8][256]; /* current group name(s) */ |
| 76 |
char objname[256]; /* 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 |
if (n0norm) |
| 148 |
printf("# %d invalid (zero) normals\n", n0norm); |
| 149 |
exit(0); |
| 150 |
userr: |
| 151 |
fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n][-f] [file.obj]\n", |
| 152 |
argv[0]); |
| 153 |
exit(1); |
| 154 |
} |
| 155 |
|
| 156 |
|
| 157 |
void |
| 158 |
getnames( /* get valid qualifier names */ |
| 159 |
FILE *fp |
| 160 |
) |
| 161 |
{ |
| 162 |
char *argv[MAXARG]; |
| 163 |
int argc; |
| 164 |
ID tmpid; |
| 165 |
int i; |
| 166 |
|
| 167 |
while ( (argc = getstmt(argv, fp)) ) |
| 168 |
switch (argv[0][0]) { |
| 169 |
case 'f': /* face */ |
| 170 |
if (!argv[0][1]) |
| 171 |
faceno++; |
| 172 |
break; |
| 173 |
case 'u': |
| 174 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
| 175 |
if (argc < 2) |
| 176 |
break; /* not fatal */ |
| 177 |
tmpid.number = 0; |
| 178 |
tmpid.name = argv[1]; |
| 179 |
findid(&qual[Q_MTL], &tmpid, 1); |
| 180 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
| 181 |
if (argc < 2 || !strcmp(argv[1], "off")) |
| 182 |
break; /* not fatal */ |
| 183 |
tmpid.number = 0; |
| 184 |
tmpid.name = argv[1]; |
| 185 |
findid(&qual[Q_MAP], &tmpid, 1); |
| 186 |
} |
| 187 |
break; |
| 188 |
case 'o': /* object name */ |
| 189 |
if (argv[0][1] || argc < 2) |
| 190 |
break; |
| 191 |
tmpid.number = 0; |
| 192 |
tmpid.name = argv[1]; |
| 193 |
findid(&qual[Q_OBJ], &tmpid, 1); |
| 194 |
break; |
| 195 |
case 'g': /* group name(s) */ |
| 196 |
if (argv[0][1]) |
| 197 |
break; |
| 198 |
tmpid.number = 0; |
| 199 |
for (i = 1; i < argc; i++) { |
| 200 |
tmpid.name = argv[i]; |
| 201 |
findid(&qual[Q_GRP], &tmpid, 1); |
| 202 |
} |
| 203 |
break; |
| 204 |
} |
| 205 |
} |
| 206 |
|
| 207 |
|
| 208 |
void |
| 209 |
convert( /* convert an OBJ stream */ |
| 210 |
FILE *fp |
| 211 |
) |
| 212 |
{ |
| 213 |
char *argv[MAXARG]; |
| 214 |
int argc; |
| 215 |
int nstats, nunknown; |
| 216 |
int i; |
| 217 |
|
| 218 |
nstats = nunknown = 0; |
| 219 |
/* scan until EOF */ |
| 220 |
while ( (argc = getstmt(argv, fp)) ) { |
| 221 |
switch (argv[0][0]) { |
| 222 |
case 'v': /* vertex */ |
| 223 |
switch (argv[0][1]) { |
| 224 |
case '\0': /* point */ |
| 225 |
if (badarg(argc-1,argv+1,"fff")) |
| 226 |
syntax("Bad vertex"); |
| 227 |
newv(atof(argv[1]), atof(argv[2]), |
| 228 |
atof(argv[3])); |
| 229 |
break; |
| 230 |
case 'n': /* normal */ |
| 231 |
if (argv[0][2]) |
| 232 |
goto unknown; |
| 233 |
if (badarg(argc-1,argv+1,"fff")) |
| 234 |
syntax("Bad normal"); |
| 235 |
if (!newvn(atof(argv[1]), atof(argv[2]), |
| 236 |
atof(argv[3]))) |
| 237 |
syntax("Zero normal"); |
| 238 |
break; |
| 239 |
case 't': /* texture map */ |
| 240 |
if (argv[0][2]) |
| 241 |
goto unknown; |
| 242 |
if (badarg(argc-1,argv+1,"ff")) |
| 243 |
goto unknown; |
| 244 |
newvt(atof(argv[1]), atof(argv[2])); |
| 245 |
break; |
| 246 |
default: |
| 247 |
goto unknown; |
| 248 |
} |
| 249 |
break; |
| 250 |
case 'f': /* face */ |
| 251 |
if (argv[0][1]) |
| 252 |
goto unknown; |
| 253 |
faceno++; |
| 254 |
switch (argc-1) { |
| 255 |
case 0: case 1: case 2: |
| 256 |
syntax("Too few vertices"); |
| 257 |
break; |
| 258 |
case 3: |
| 259 |
if (!puttri(argv[1], argv[2], argv[3])) |
| 260 |
syntax("Bad triangle"); |
| 261 |
break; |
| 262 |
default: |
| 263 |
if (!putface(argc-1, argv+1)) |
| 264 |
syntax("Bad face"); |
| 265 |
break; |
| 266 |
} |
| 267 |
break; |
| 268 |
case 'u': |
| 269 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
| 270 |
if (argc < 2) |
| 271 |
break; /* not fatal */ |
| 272 |
strcpy(matname, argv[1]); |
| 273 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
| 274 |
if (argc < 2) |
| 275 |
break; /* not fatal */ |
| 276 |
if (!strcmp(argv[1], "off")) |
| 277 |
mapname[0] = '\0'; |
| 278 |
else |
| 279 |
sprintf(mapname, "%s.hdr", argv[1]); |
| 280 |
} else |
| 281 |
goto unknown; |
| 282 |
break; |
| 283 |
case 'o': /* object name */ |
| 284 |
if (argv[0][1]) |
| 285 |
goto unknown; |
| 286 |
if (argc < 2) |
| 287 |
break; /* not fatal */ |
| 288 |
strcpy(objname, argv[1]); |
| 289 |
break; |
| 290 |
case 'g': /* group name(s) */ |
| 291 |
if (argv[0][1]) |
| 292 |
goto unknown; |
| 293 |
for (i = 1; i < argc; i++) |
| 294 |
strcpy(group[i-1], argv[i]); |
| 295 |
group[argc-1][0] = '\0'; |
| 296 |
break; |
| 297 |
case '#': /* comment */ |
| 298 |
printargs(argc, argv, stdout); |
| 299 |
break; |
| 300 |
default:; /* something we don't deal with */ |
| 301 |
unknown: |
| 302 |
nunknown++; |
| 303 |
break; |
| 304 |
} |
| 305 |
nstats++; |
| 306 |
} |
| 307 |
printf("\n# Done processing file: %s\n", inpfile); |
| 308 |
printf("# %d lines, %d statements, %d unrecognized\n", |
| 309 |
lineno, nstats, nunknown); |
| 310 |
} |
| 311 |
|
| 312 |
|
| 313 |
int |
| 314 |
getstmt( /* read the next statement from fp */ |
| 315 |
char *av[MAXARG], |
| 316 |
FILE *fp |
| 317 |
) |
| 318 |
{ |
| 319 |
static char sbuf[MAXARG*16]; |
| 320 |
char *cp; |
| 321 |
int i; |
| 322 |
|
| 323 |
do { |
| 324 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
| 325 |
return(0); |
| 326 |
i = 0; |
| 327 |
for ( ; ; ) { |
| 328 |
while (isspace(*cp) || *cp == '\\') { |
| 329 |
if (*cp == '\n') |
| 330 |
lineno++; |
| 331 |
*cp++ = '\0'; |
| 332 |
} |
| 333 |
if (!*cp) |
| 334 |
break; |
| 335 |
if (i >= MAXARG-1) { |
| 336 |
fprintf(stderr, |
| 337 |
"warning: line %d: too many arguments (limit %d)\n", |
| 338 |
lineno+1, MAXARG-1); |
| 339 |
break; |
| 340 |
} |
| 341 |
av[i++] = cp; |
| 342 |
while (*++cp && !isspace(*cp)) |
| 343 |
; |
| 344 |
} |
| 345 |
av[i] = NULL; |
| 346 |
lineno++; |
| 347 |
} while (!i); |
| 348 |
|
| 349 |
return(i); |
| 350 |
} |
| 351 |
|
| 352 |
|
| 353 |
char * |
| 354 |
getmtl(void) /* figure material for this face */ |
| 355 |
{ |
| 356 |
RULEHD *rp = ourmapping; |
| 357 |
|
| 358 |
if (rp == NULL) { /* no rule set */ |
| 359 |
if (matname[0]) |
| 360 |
return(matname); |
| 361 |
if (group[0][0]) |
| 362 |
return(group[0]); |
| 363 |
return(defmat); |
| 364 |
} |
| 365 |
/* check for match */ |
| 366 |
do { |
| 367 |
if (matchrule(rp)) { |
| 368 |
if (!strcmp(rp->mnam, VOIDID)) |
| 369 |
return(NULL); /* match is null */ |
| 370 |
return(rp->mnam); |
| 371 |
} |
| 372 |
rp = rp->next; |
| 373 |
} while (rp != NULL); |
| 374 |
/* no match found */ |
| 375 |
return(NULL); |
| 376 |
} |
| 377 |
|
| 378 |
|
| 379 |
char * |
| 380 |
getonm(void) /* invent a good name for object */ |
| 381 |
{ |
| 382 |
static char name[64]; |
| 383 |
char *cp1, *cp2; |
| 384 |
int i; |
| 385 |
/* check for preset */ |
| 386 |
if (objname[0]) |
| 387 |
return(objname); |
| 388 |
if (!group[0][0]) |
| 389 |
return(defobj); |
| 390 |
cp1 = name; /* else make name out of groups */ |
| 391 |
for (i = 0; group[i][0]; i++) { |
| 392 |
cp2 = group[i]; |
| 393 |
if (cp1 > name) |
| 394 |
*cp1++ = '.'; |
| 395 |
while ( (*cp1 = *cp2++) ) |
| 396 |
if (++cp1 >= name+sizeof(name)-2) { |
| 397 |
*cp1 = '\0'; |
| 398 |
return(name); |
| 399 |
} |
| 400 |
} |
| 401 |
return(name); |
| 402 |
} |
| 403 |
|
| 404 |
|
| 405 |
int |
| 406 |
matchrule( /* check for a match on this rule */ |
| 407 |
RULEHD *rp |
| 408 |
) |
| 409 |
{ |
| 410 |
ID tmpid; |
| 411 |
int gotmatch; |
| 412 |
int i; |
| 413 |
|
| 414 |
if (rp->qflg & FL(Q_MTL)) { |
| 415 |
if (!matname[0]) |
| 416 |
return(0); |
| 417 |
tmpid.number = 0; |
| 418 |
tmpid.name = matname; |
| 419 |
if (!matchid(&tmpid, &idm(rp)[Q_MTL])) |
| 420 |
return(0); |
| 421 |
} |
| 422 |
if (rp->qflg & FL(Q_MAP)) { |
| 423 |
if (!mapname[0]) |
| 424 |
return(0); |
| 425 |
tmpid.number = 0; |
| 426 |
tmpid.name = mapname; |
| 427 |
if (!matchid(&tmpid, &idm(rp)[Q_MAP])) |
| 428 |
return(0); |
| 429 |
} |
| 430 |
if (rp->qflg & FL(Q_GRP)) { |
| 431 |
tmpid.number = 0; |
| 432 |
gotmatch = 0; |
| 433 |
for (i = 0; group[i][0]; i++) { |
| 434 |
tmpid.name = group[i]; |
| 435 |
gotmatch |= matchid(&tmpid, &idm(rp)[Q_GRP]); |
| 436 |
} |
| 437 |
if (!gotmatch) |
| 438 |
return(0); |
| 439 |
} |
| 440 |
if (rp->qflg & FL(Q_OBJ)) { |
| 441 |
if (!objname[0]) |
| 442 |
return(0); |
| 443 |
tmpid.number = 0; |
| 444 |
tmpid.name = objname; |
| 445 |
if (!matchid(&tmpid, &idm(rp)[Q_OBJ])) |
| 446 |
return(0); |
| 447 |
} |
| 448 |
if (rp->qflg & FL(Q_FAC)) { |
| 449 |
tmpid.name = NULL; |
| 450 |
tmpid.number = faceno; |
| 451 |
if (!matchid(&tmpid, &idm(rp)[Q_FAC])) |
| 452 |
return(0); |
| 453 |
} |
| 454 |
return(1); |
| 455 |
} |
| 456 |
|
| 457 |
|
| 458 |
int |
| 459 |
cvtndx( /* convert vertex string to index */ |
| 460 |
VNDX vi, |
| 461 |
char *vs |
| 462 |
) |
| 463 |
{ |
| 464 |
/* get point */ |
| 465 |
vi[0] = atoi(vs); |
| 466 |
if (vi[0] > 0) { |
| 467 |
if (vi[0]-- > nvs) |
| 468 |
return(0); |
| 469 |
} else if (vi[0] < 0) { |
| 470 |
vi[0] += nvs; |
| 471 |
if (vi[0] < 0) |
| 472 |
return(0); |
| 473 |
} else |
| 474 |
return(0); |
| 475 |
/* get map */ |
| 476 |
while (*vs) |
| 477 |
if (*vs++ == '/') |
| 478 |
break; |
| 479 |
vi[1] = atoi(vs); |
| 480 |
if (vi[1] > 0) { |
| 481 |
if (vi[1]-- > nvts) |
| 482 |
return(0); |
| 483 |
} else if (vi[1] < 0) { |
| 484 |
vi[1] += nvts; |
| 485 |
if (vi[1] < 0) |
| 486 |
return(0); |
| 487 |
} else |
| 488 |
vi[1] = -1; |
| 489 |
/* get normal */ |
| 490 |
while (*vs) |
| 491 |
if (*vs++ == '/') |
| 492 |
break; |
| 493 |
vi[2] = atoi(vs); |
| 494 |
if (vi[2] > 0) { |
| 495 |
if (vi[2]-- > nvns) |
| 496 |
return(0); |
| 497 |
} else if (vi[2] < 0) { |
| 498 |
vi[2] += nvns; |
| 499 |
if (vi[2] < 0) |
| 500 |
return(0); |
| 501 |
} else |
| 502 |
vi[2] = -1; |
| 503 |
/* zero normal is not normal */ |
| 504 |
if (vi[2] >= 0 && DOT(vnlist[vi[2]],vnlist[vi[2]]) <= FTINY) |
| 505 |
vi[2] = -1; |
| 506 |
return(1); |
| 507 |
} |
| 508 |
|
| 509 |
|
| 510 |
int |
| 511 |
nonplanar( /* are vertices non-planar? */ |
| 512 |
int ac, |
| 513 |
char **av |
| 514 |
) |
| 515 |
{ |
| 516 |
VNDX vi; |
| 517 |
RREAL *p0, *p1; |
| 518 |
FVECT v1, v2, nsum, newn; |
| 519 |
double d; |
| 520 |
int i; |
| 521 |
|
| 522 |
if (!cvtndx(vi, av[0])) |
| 523 |
return(0); |
| 524 |
if (!flatten && vi[2] >= 0) |
| 525 |
return(1); /* has interpolated normals */ |
| 526 |
if (ac < 4) |
| 527 |
return(0); /* it's a triangle! */ |
| 528 |
/* set up */ |
| 529 |
p0 = vlist[vi[0]]; |
| 530 |
if (!cvtndx(vi, av[1])) |
| 531 |
return(0); /* error gets caught later */ |
| 532 |
nsum[0] = nsum[1] = nsum[2] = 0.; |
| 533 |
p1 = vlist[vi[0]]; |
| 534 |
fvsum(v2, p1, p0, -1.0); |
| 535 |
for (i = 2; i < ac; i++) { |
| 536 |
VCOPY(v1, v2); |
| 537 |
if (!cvtndx(vi, av[i])) |
| 538 |
return(0); |
| 539 |
p1 = vlist[vi[0]]; |
| 540 |
fvsum(v2, p1, p0, -1.0); |
| 541 |
fcross(newn, v1, v2); |
| 542 |
if (normalize(newn) == 0.0) { |
| 543 |
if (i < 3) |
| 544 |
return(1); /* can't deal with this */ |
| 545 |
fvsum(nsum, nsum, nsum, 1./(i-2)); |
| 546 |
continue; |
| 547 |
} |
| 548 |
d = fdot(newn,nsum); |
| 549 |
if (d >= 0) { |
| 550 |
if (d < (1.0-FTINY)*(i-2)) |
| 551 |
return(1); |
| 552 |
fvsum(nsum, nsum, newn, 1.0); |
| 553 |
} else { |
| 554 |
if (d > -(1.0-FTINY)*(i-2)) |
| 555 |
return(1); |
| 556 |
fvsum(nsum, nsum, newn, -1.0); |
| 557 |
} |
| 558 |
} |
| 559 |
return(0); |
| 560 |
} |
| 561 |
|
| 562 |
|
| 563 |
int |
| 564 |
putface( /* put out an N-sided polygon */ |
| 565 |
int ac, |
| 566 |
char **av |
| 567 |
) |
| 568 |
{ |
| 569 |
VNDX vi; |
| 570 |
char *cp; |
| 571 |
int i; |
| 572 |
|
| 573 |
if (nonplanar(ac, av)) { /* break into triangles */ |
| 574 |
while (ac > 2) { |
| 575 |
if (!puttri(av[0], av[1], av[2])) |
| 576 |
return(0); |
| 577 |
ac--; /* remove vertex & rotate */ |
| 578 |
cp = av[0]; |
| 579 |
for (i = 0; i < ac-1; i++) |
| 580 |
av[i] = av[i+2]; |
| 581 |
av[i] = cp; |
| 582 |
} |
| 583 |
return(1); |
| 584 |
} |
| 585 |
if ((cp = getmtl()) == NULL) |
| 586 |
return(-1); |
| 587 |
printf("\n%s polygon %s.%d\n", cp, getonm(), faceno); |
| 588 |
printf("0\n0\n%d\n", 3*ac); |
| 589 |
for (i = 0; i < ac; i++) { |
| 590 |
if (!cvtndx(vi, av[i])) |
| 591 |
return(0); |
| 592 |
pvect(vlist[vi[0]]); |
| 593 |
} |
| 594 |
return(1); |
| 595 |
} |
| 596 |
|
| 597 |
|
| 598 |
int |
| 599 |
puttri( /* put out a triangle */ |
| 600 |
char *v1, |
| 601 |
char *v2, |
| 602 |
char *v3 |
| 603 |
) |
| 604 |
{ |
| 605 |
char *mod; |
| 606 |
VNDX v1i, v2i, v3i; |
| 607 |
BARYCCM bvecs; |
| 608 |
RREAL bcoor[3][3]; |
| 609 |
int texOK = 0, patOK; |
| 610 |
int flatness; |
| 611 |
int i; |
| 612 |
|
| 613 |
if ((mod = getmtl()) == NULL) |
| 614 |
return(-1); |
| 615 |
|
| 616 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
| 617 |
return(0); |
| 618 |
/* compute barycentric coordinates */ |
| 619 |
if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) |
| 620 |
flatness = flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]], |
| 621 |
vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]]); |
| 622 |
else |
| 623 |
flatness = ISFLAT; |
| 624 |
|
| 625 |
switch (flatness) { |
| 626 |
case DEGEN: /* zero area */ |
| 627 |
ndegen++; |
| 628 |
return(-1); |
| 629 |
case RVFLAT: /* reversed normals, but flat */ |
| 630 |
case ISFLAT: /* smoothing unnecessary */ |
| 631 |
texOK = 0; |
| 632 |
break; |
| 633 |
case RVBENT: /* reversed normals with smoothing */ |
| 634 |
case ISBENT: /* proper smoothing */ |
| 635 |
texOK = 1; |
| 636 |
break; |
| 637 |
} |
| 638 |
if (flatten) |
| 639 |
texOK = 0; |
| 640 |
#ifdef TEXMAPS |
| 641 |
patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0); |
| 642 |
#else |
| 643 |
patOK = 0; |
| 644 |
#endif |
| 645 |
if (texOK | patOK) |
| 646 |
if (comp_baryc(&bvecs, vlist[v1i[0]], vlist[v2i[0]], |
| 647 |
vlist[v3i[0]]) < 0) |
| 648 |
texOK = patOK = 0; |
| 649 |
/* put out texture (if any) */ |
| 650 |
if (texOK) { |
| 651 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 652 |
mod = TEXNAME; |
| 653 |
printf("4 dx dy dz %s\n", TCALNAME); |
| 654 |
printf("0\n"); |
| 655 |
for (i = 0; i < 3; i++) { |
| 656 |
bcoor[i][0] = vnlist[v1i[2]][i]; |
| 657 |
bcoor[i][1] = vnlist[v2i[2]][i]; |
| 658 |
bcoor[i][2] = vnlist[v3i[2]][i]; |
| 659 |
} |
| 660 |
fput_baryc(&bvecs, bcoor, 3, stdout); |
| 661 |
} |
| 662 |
#ifdef TEXMAPS |
| 663 |
/* put out pattern (if any) */ |
| 664 |
if (patOK) { |
| 665 |
printf("\n%s colorpict %s\n", mod, PATNAME); |
| 666 |
mod = PATNAME; |
| 667 |
printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME); |
| 668 |
printf("0\n"); |
| 669 |
for (i = 0; i < 2; i++) { |
| 670 |
bcoor[i][0] = vtlist[v1i[1]][i]; |
| 671 |
bcoor[i][1] = vtlist[v2i[1]][i]; |
| 672 |
bcoor[i][2] = vtlist[v3i[1]][i]; |
| 673 |
} |
| 674 |
fput_baryc(&bvecs, bcoor, 2, stdout); |
| 675 |
} |
| 676 |
#endif |
| 677 |
/* put out (reversed) triangle */ |
| 678 |
printf("\n%s polygon %s.%d\n", mod, getonm(), faceno); |
| 679 |
printf("0\n0\n9\n"); |
| 680 |
if (flatness == RVFLAT || flatness == RVBENT) { |
| 681 |
pvect(vlist[v3i[0]]); |
| 682 |
pvect(vlist[v2i[0]]); |
| 683 |
pvect(vlist[v1i[0]]); |
| 684 |
} else { |
| 685 |
pvect(vlist[v1i[0]]); |
| 686 |
pvect(vlist[v2i[0]]); |
| 687 |
pvect(vlist[v3i[0]]); |
| 688 |
} |
| 689 |
return(1); |
| 690 |
} |
| 691 |
|
| 692 |
|
| 693 |
void |
| 694 |
freeverts(void) /* free all vertices */ |
| 695 |
{ |
| 696 |
if (nvs) { |
| 697 |
free((void *)vlist); |
| 698 |
nvs = 0; |
| 699 |
} |
| 700 |
if (nvts) { |
| 701 |
free((void *)vtlist); |
| 702 |
nvts = 0; |
| 703 |
} |
| 704 |
if (nvns) { |
| 705 |
free((void *)vnlist); |
| 706 |
nvns = 0; |
| 707 |
} |
| 708 |
} |
| 709 |
|
| 710 |
|
| 711 |
int |
| 712 |
newv( /* create a new vertex */ |
| 713 |
double x, |
| 714 |
double y, |
| 715 |
double z |
| 716 |
) |
| 717 |
{ |
| 718 |
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
| 719 |
if (nvs == 0) |
| 720 |
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 721 |
else |
| 722 |
vlist = (FVECT *)realloc((void *)vlist, |
| 723 |
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
| 724 |
if (vlist == NULL) { |
| 725 |
fprintf(stderr, |
| 726 |
"Out of memory while allocating vertex %d\n", nvs); |
| 727 |
exit(1); |
| 728 |
} |
| 729 |
} |
| 730 |
/* assign new vertex */ |
| 731 |
vlist[nvs][0] = x; |
| 732 |
vlist[nvs][1] = y; |
| 733 |
vlist[nvs][2] = z; |
| 734 |
return(++nvs); |
| 735 |
} |
| 736 |
|
| 737 |
|
| 738 |
int |
| 739 |
newvn( /* create a new vertex normal */ |
| 740 |
double x, |
| 741 |
double y, |
| 742 |
double z |
| 743 |
) |
| 744 |
{ |
| 745 |
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
| 746 |
if (nvns == 0) |
| 747 |
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 748 |
else |
| 749 |
vnlist = (FVECT *)realloc((void *)vnlist, |
| 750 |
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
| 751 |
if (vnlist == NULL) { |
| 752 |
fprintf(stderr, |
| 753 |
"Out of memory while allocating normal %d\n", nvns); |
| 754 |
exit(1); |
| 755 |
} |
| 756 |
} |
| 757 |
/* assign new normal */ |
| 758 |
vnlist[nvns][0] = x; |
| 759 |
vnlist[nvns][1] = y; |
| 760 |
vnlist[nvns][2] = z; |
| 761 |
n0norm += (normalize(vnlist[nvns]) == 0.0); |
| 762 |
return(++nvns); |
| 763 |
} |
| 764 |
|
| 765 |
|
| 766 |
int |
| 767 |
newvt( /* create a new texture map vertex */ |
| 768 |
double x, |
| 769 |
double y |
| 770 |
) |
| 771 |
{ |
| 772 |
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
| 773 |
if (nvts == 0) |
| 774 |
vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL)); |
| 775 |
else |
| 776 |
vtlist = (RREAL (*)[2])realloc((void *)vtlist, |
| 777 |
(nvts+CHUNKSIZ)*2*sizeof(RREAL)); |
| 778 |
if (vtlist == NULL) { |
| 779 |
fprintf(stderr, |
| 780 |
"Out of memory while allocating texture vertex %d\n", |
| 781 |
nvts); |
| 782 |
exit(1); |
| 783 |
} |
| 784 |
} |
| 785 |
/* assign new vertex */ |
| 786 |
vtlist[nvts][0] = x; |
| 787 |
vtlist[nvts][1] = y; |
| 788 |
return(++nvts); |
| 789 |
} |
| 790 |
|
| 791 |
|
| 792 |
void |
| 793 |
syntax( /* report syntax error and exit */ |
| 794 |
char *er |
| 795 |
) |
| 796 |
{ |
| 797 |
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
| 798 |
inpfile, lineno, er); |
| 799 |
exit(1); |
| 800 |
} |
