| 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. |
| 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 FLOAT BARYCCM[3][4]; /* barycentric coordinate system */ |
| 41 |
|
| 42 |
typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
| 43 |
|
| 44 |
#define CHUNKSIZ 256 /* vertex allocation chunk size */ |
| 45 |
|
| 46 |
#define MAXARG 64 /* maximum # arguments in a statement */ |
| 47 |
|
| 48 |
/* qualifiers */ |
| 49 |
#define Q_MTL 0 |
| 50 |
#define Q_MAP 1 |
| 51 |
#define Q_GRP 2 |
| 52 |
#define Q_OBJ 3 |
| 53 |
#define Q_FAC 4 |
| 54 |
#define NQUALS 5 |
| 55 |
|
| 56 |
char *qname[NQUALS] = { |
| 57 |
"Material", |
| 58 |
"Map", |
| 59 |
"Group", |
| 60 |
"Object", |
| 61 |
"Face", |
| 62 |
}; |
| 63 |
|
| 64 |
QLIST qlist = {NQUALS, qname}; |
| 65 |
/* valid qualifier ids */ |
| 66 |
IDLIST qual[NQUALS]; |
| 67 |
/* mapping rules */ |
| 68 |
RULEHD *ourmapping = NULL; |
| 69 |
|
| 70 |
char *defmat = DEFMAT; /* default (starting) material name */ |
| 71 |
char *defobj = DEFOBJ; /* default (starting) object name */ |
| 72 |
|
| 73 |
char *getmtl(), *getonm(); |
| 74 |
|
| 75 |
char mapname[128]; /* current picture file */ |
| 76 |
char matname[64]; /* current material name */ |
| 77 |
char group[16][32]; /* current group names */ |
| 78 |
char objname[128]; /* current object name */ |
| 79 |
char *inpfile; /* input file name */ |
| 80 |
int lineno; /* current line number */ |
| 81 |
int faceno; /* current face number */ |
| 82 |
|
| 83 |
|
| 84 |
main(argc, argv) /* read in .obj file and convert */ |
| 85 |
int argc; |
| 86 |
char *argv[]; |
| 87 |
{ |
| 88 |
int donames = 0; |
| 89 |
int i; |
| 90 |
|
| 91 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
| 92 |
switch (argv[i][1]) { |
| 93 |
case 'o': /* object name */ |
| 94 |
defobj = argv[++i]; |
| 95 |
break; |
| 96 |
case 'n': /* just produce name list */ |
| 97 |
donames++; |
| 98 |
break; |
| 99 |
case 'm': /* use custom mapfile */ |
| 100 |
ourmapping = getmapping(argv[++i], &qlist); |
| 101 |
break; |
| 102 |
default: |
| 103 |
goto userr; |
| 104 |
} |
| 105 |
if (i > argc | i < argc-1) |
| 106 |
goto userr; |
| 107 |
if (i == argc) |
| 108 |
inpfile = "<stdin>"; |
| 109 |
else if (freopen(inpfile=argv[i], "r", stdin) == NULL) { |
| 110 |
fprintf(stderr, "%s: cannot open\n", inpfile); |
| 111 |
exit(1); |
| 112 |
} |
| 113 |
if (donames) { /* scan for ids */ |
| 114 |
getnames(stdin); |
| 115 |
printf("filename \"%s\"\n", inpfile); |
| 116 |
printf("filetype \"Wavefront\"\n"); |
| 117 |
write_quals(&qlist, qual, stdout); |
| 118 |
printf("qualifier %s begin\n", qlist.qual[Q_FAC]); |
| 119 |
printf("[%d:%d]\n", 1, faceno); |
| 120 |
printf("end\n"); |
| 121 |
} else { /* translate file */ |
| 122 |
printf("# "); |
| 123 |
printargs(argc, argv, stdout); |
| 124 |
convert(stdin); |
| 125 |
} |
| 126 |
exit(0); |
| 127 |
userr: |
| 128 |
fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n] [file.obj]\n", |
| 129 |
argv[0]); |
| 130 |
exit(1); |
| 131 |
} |
| 132 |
|
| 133 |
|
| 134 |
getnames(fp) /* get valid qualifier names */ |
| 135 |
FILE *fp; |
| 136 |
{ |
| 137 |
char *argv[MAXARG]; |
| 138 |
int argc; |
| 139 |
ID tmpid; |
| 140 |
register int i; |
| 141 |
|
| 142 |
while (argc = getstmt(argv, fp)) |
| 143 |
switch (argv[0][0]) { |
| 144 |
case 'f': /* face */ |
| 145 |
if (!argv[0][1]) |
| 146 |
faceno++; |
| 147 |
break; |
| 148 |
case 'u': |
| 149 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
| 150 |
if (argc < 2) |
| 151 |
break; /* not fatal */ |
| 152 |
tmpid.number = 0; |
| 153 |
tmpid.name = argv[1]; |
| 154 |
findid(&qual[Q_MTL], &tmpid, 1); |
| 155 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
| 156 |
if (argc < 2 || !strcmp(argv[1], "off")) |
| 157 |
break; /* not fatal */ |
| 158 |
tmpid.number = 0; |
| 159 |
tmpid.name = argv[1]; |
| 160 |
findid(&qual[Q_MAP], &tmpid, 1); |
| 161 |
} |
| 162 |
break; |
| 163 |
case 'o': /* object name */ |
| 164 |
if (argv[0][1] || argc < 2) |
| 165 |
break; |
| 166 |
tmpid.number = 0; |
| 167 |
tmpid.name = argv[1]; |
| 168 |
findid(&qual[Q_OBJ], &tmpid, 1); |
| 169 |
break; |
| 170 |
case 'g': /* group name(s) */ |
| 171 |
if (argv[0][1]) |
| 172 |
break; |
| 173 |
tmpid.number = 0; |
| 174 |
for (i = 1; i < argc; i++) { |
| 175 |
tmpid.name = argv[i]; |
| 176 |
findid(&qual[Q_GRP], &tmpid, 1); |
| 177 |
} |
| 178 |
break; |
| 179 |
} |
| 180 |
} |
| 181 |
|
| 182 |
|
| 183 |
convert(fp) /* convert a T-mesh */ |
| 184 |
FILE *fp; |
| 185 |
{ |
| 186 |
char *argv[MAXARG]; |
| 187 |
int argc; |
| 188 |
int nstats, nunknown; |
| 189 |
register int i; |
| 190 |
|
| 191 |
nstats = nunknown = 0; |
| 192 |
/* scan until EOF */ |
| 193 |
while (argc = getstmt(argv, fp)) { |
| 194 |
switch (argv[0][0]) { |
| 195 |
case 'v': /* vertex */ |
| 196 |
switch (argv[0][1]) { |
| 197 |
case '\0': /* point */ |
| 198 |
if (badarg(argc-1,argv+1,"fff")) |
| 199 |
syntax("Bad vertex"); |
| 200 |
newv(atof(argv[1]), atof(argv[2]), |
| 201 |
atof(argv[3])); |
| 202 |
break; |
| 203 |
case 'n': /* normal */ |
| 204 |
if (argv[0][2]) |
| 205 |
goto unknown; |
| 206 |
if (badarg(argc-1,argv+1,"fff")) |
| 207 |
syntax("Bad normal"); |
| 208 |
if (!newvn(atof(argv[1]), atof(argv[2]), |
| 209 |
atof(argv[3]))) |
| 210 |
syntax("Zero normal"); |
| 211 |
break; |
| 212 |
case 't': /* texture map */ |
| 213 |
if (argv[0][2]) |
| 214 |
goto unknown; |
| 215 |
if (badarg(argc-1,argv+1,"ff")) |
| 216 |
goto unknown; |
| 217 |
newvt(atof(argv[1]), atof(argv[2])); |
| 218 |
break; |
| 219 |
default: |
| 220 |
goto unknown; |
| 221 |
} |
| 222 |
break; |
| 223 |
case 'f': /* face */ |
| 224 |
if (argv[0][1]) |
| 225 |
goto unknown; |
| 226 |
faceno++; |
| 227 |
switch (argc-1) { |
| 228 |
case 0: case 1: case 2: |
| 229 |
syntax("Too few vertices"); |
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break; |
| 231 |
case 3: |
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if (!puttri(argv[1], argv[2], argv[3])) |
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syntax("Bad triangle"); |
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break; |
| 235 |
case 4: |
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if (!putquad(argv[1], argv[2], |
| 237 |
argv[3], argv[4])) |
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syntax("Bad quad"); |
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break; |
| 240 |
default: |
| 241 |
if (!putface(argc-1, argv+1)) |
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syntax("Bad face"); |
| 243 |
break; |
| 244 |
} |
| 245 |
break; |
| 246 |
case 'u': |
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if (!strcmp(argv[0], "usemtl")) { /* material */ |
| 248 |
if (argc < 2) |
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break; /* not fatal */ |
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strcpy(matname, argv[1]); |
| 251 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
| 252 |
if (argc < 2) |
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break; /* not fatal */ |
| 254 |
if (!strcmp(argv[1], "off")) |
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mapname[0] = '\0'; |
| 256 |
else |
| 257 |
strcpy(mapname, argv[1]); |
| 258 |
} else |
| 259 |
goto unknown; |
| 260 |
break; |
| 261 |
case 'o': /* object name */ |
| 262 |
if (argv[0][1]) |
| 263 |
goto unknown; |
| 264 |
if (argc < 2) |
| 265 |
break; /* not fatal */ |
| 266 |
strcpy(objname, argv[1]); |
| 267 |
break; |
| 268 |
case 'g': /* group name(s) */ |
| 269 |
if (argv[0][1]) |
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goto unknown; |
| 271 |
for (i = 1; i < argc; i++) |
| 272 |
strcpy(group[i-1], argv[i]); |
| 273 |
group[i-1][0] = '\0'; |
| 274 |
break; |
| 275 |
case '#': /* comment */ |
| 276 |
break; |
| 277 |
default:; /* something we don't deal with */ |
| 278 |
unknown: |
| 279 |
nunknown++; |
| 280 |
break; |
| 281 |
} |
| 282 |
nstats++; |
| 283 |
} |
| 284 |
printf("\n# Done processing file: %s\n", inpfile); |
| 285 |
printf("# %d lines, %d statements, %d unrecognized\n", |
| 286 |
lineno, nstats, nunknown); |
| 287 |
} |
| 288 |
|
| 289 |
|
| 290 |
int |
| 291 |
getstmt(av, fp) /* read the next statement from fp */ |
| 292 |
register char *av[MAXARG]; |
| 293 |
FILE *fp; |
| 294 |
{ |
| 295 |
extern char *fgetline(); |
| 296 |
static char sbuf[MAXARG*10]; |
| 297 |
register char *cp; |
| 298 |
register int i; |
| 299 |
|
| 300 |
do { |
| 301 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
| 302 |
return(0); |
| 303 |
i = 0; |
| 304 |
for ( ; ; ) { |
| 305 |
while (isspace(*cp) || *cp == '\\') { |
| 306 |
if (*cp == '\n') |
| 307 |
lineno++; |
| 308 |
*cp++ = '\0'; |
| 309 |
} |
| 310 |
if (!*cp || i >= MAXARG-1) |
| 311 |
break; |
| 312 |
av[i++] = cp; |
| 313 |
while (*++cp && !isspace(*cp)) |
| 314 |
; |
| 315 |
} |
| 316 |
av[i] = NULL; |
| 317 |
lineno++; |
| 318 |
} while (!i); |
| 319 |
|
| 320 |
return(i); |
| 321 |
} |
| 322 |
|
| 323 |
|
| 324 |
char * |
| 325 |
getmtl() /* figure material for this face */ |
| 326 |
{ |
| 327 |
register RULEHD *rp = ourmapping; |
| 328 |
|
| 329 |
if (rp == NULL) { /* no rule set */ |
| 330 |
if (matname[0]) |
| 331 |
return(matname); |
| 332 |
if (group[0][0]) |
| 333 |
return(group[0]); |
| 334 |
return(defmat); |
| 335 |
} |
| 336 |
/* check for match */ |
| 337 |
do { |
| 338 |
if (matchrule(rp)) { |
| 339 |
if (!strcmp(rp->mnam, VOIDID)) |
| 340 |
return(NULL); /* match is null */ |
| 341 |
return(rp->mnam); |
| 342 |
} |
| 343 |
rp = rp->next; |
| 344 |
} while (rp != NULL); |
| 345 |
/* no match found */ |
| 346 |
return(NULL); |
| 347 |
} |
| 348 |
|
| 349 |
|
| 350 |
char * |
| 351 |
getonm() /* invent a good name for object */ |
| 352 |
{ |
| 353 |
static char name[64]; |
| 354 |
register char *cp1, *cp2; |
| 355 |
register int i; |
| 356 |
/* check for preset */ |
| 357 |
if (objname[0]) |
| 358 |
return(objname); |
| 359 |
if (!group[0][0]) |
| 360 |
return(defobj); |
| 361 |
cp1 = name; /* else make name out of groups */ |
| 362 |
for (i = 0; group[i][0]; i++) { |
| 363 |
cp2 = group[i]; |
| 364 |
if (cp1 > name) |
| 365 |
*cp1++ = '.'; |
| 366 |
while (*cp1 = *cp2++) |
| 367 |
if (++cp1 >= name+sizeof(name)-2) { |
| 368 |
*cp1 = '\0'; |
| 369 |
return(name); |
| 370 |
} |
| 371 |
} |
| 372 |
return(name); |
| 373 |
} |
| 374 |
|
| 375 |
|
| 376 |
matchrule(rp) /* check for a match on this rule */ |
| 377 |
register RULEHD *rp; |
| 378 |
{ |
| 379 |
ID tmpid; |
| 380 |
int gotmatch; |
| 381 |
register int i; |
| 382 |
|
| 383 |
if (rp->qflg & FL(Q_MTL)) { |
| 384 |
if (!matname[0]) |
| 385 |
return(0); |
| 386 |
tmpid.number = 0; |
| 387 |
tmpid.name = matname; |
| 388 |
if (!matchid(&tmpid, &idm(rp)[Q_MTL])) |
| 389 |
return(0); |
| 390 |
} |
| 391 |
if (rp->qflg & FL(Q_MAP)) { |
| 392 |
if (!mapname[0]) |
| 393 |
return(0); |
| 394 |
tmpid.number = 0; |
| 395 |
tmpid.name = mapname; |
| 396 |
if (!matchid(&tmpid, &idm(rp)[Q_MAP])) |
| 397 |
return(0); |
| 398 |
} |
| 399 |
if (rp->qflg & FL(Q_GRP)) { |
| 400 |
tmpid.number = 0; |
| 401 |
gotmatch = 0; |
| 402 |
for (i = 0; group[i][0]; i++) { |
| 403 |
tmpid.name = group[i]; |
| 404 |
gotmatch |= matchid(&tmpid, &idm(rp)[Q_GRP]); |
| 405 |
} |
| 406 |
if (!gotmatch) |
| 407 |
return(0); |
| 408 |
} |
| 409 |
if (rp->qflg & FL(Q_OBJ)) { |
| 410 |
if (!objname[0]) |
| 411 |
return(0); |
| 412 |
tmpid.number = 0; |
| 413 |
tmpid.name = objname; |
| 414 |
if (!matchid(&tmpid, &idm(rp)[Q_OBJ])) |
| 415 |
return(0); |
| 416 |
} |
| 417 |
if (rp->qflg & FL(Q_FAC)) { |
| 418 |
tmpid.name = NULL; |
| 419 |
tmpid.number = faceno; |
| 420 |
if (!matchid(&tmpid, &idm(rp)[Q_FAC])) |
| 421 |
return(0); |
| 422 |
} |
| 423 |
return(1); |
| 424 |
} |
| 425 |
|
| 426 |
|
| 427 |
cvtndx(vi, vs) /* convert vertex string to index */ |
| 428 |
register VNDX vi; |
| 429 |
register char *vs; |
| 430 |
{ |
| 431 |
/* get point */ |
| 432 |
vi[0] = atoi(vs); |
| 433 |
if (vi[0] > 0) { |
| 434 |
if (vi[0]-- > nvs) |
| 435 |
return(0); |
| 436 |
} else if (vi[0] < 0) { |
| 437 |
vi[0] = nvs + vi[0]; |
| 438 |
if (vi[0] < 0) |
| 439 |
return(0); |
| 440 |
} else |
| 441 |
return(0); |
| 442 |
/* get map */ |
| 443 |
while (*vs) |
| 444 |
if (*vs++ == '/') |
| 445 |
break; |
| 446 |
vi[1] = atoi(vs); |
| 447 |
if (vi[1] > 0) { |
| 448 |
if (vi[1]-- > nvts) |
| 449 |
return(0); |
| 450 |
} else if (vi[1] < 0) { |
| 451 |
vi[1] = nvts + vi[1]; |
| 452 |
if (vi[1] < 0) |
| 453 |
return(0); |
| 454 |
} else |
| 455 |
vi[1] = -1; |
| 456 |
/* get normal */ |
| 457 |
while (*vs) |
| 458 |
if (*vs++ == '/') |
| 459 |
break; |
| 460 |
vi[2] = atoi(vs); |
| 461 |
if (vi[2] > 0) { |
| 462 |
if (vi[2]-- > nvns) |
| 463 |
return(0); |
| 464 |
} else if (vi[2] < 0) { |
| 465 |
vi[2] = nvns + vi[2]; |
| 466 |
if (vi[2] < 0) |
| 467 |
return(0); |
| 468 |
} else |
| 469 |
vi[2] = -1; |
| 470 |
return(1); |
| 471 |
} |
| 472 |
|
| 473 |
|
| 474 |
nonplanar(ac, av) /* are vertices are non-planar? */ |
| 475 |
register int ac; |
| 476 |
register char **av; |
| 477 |
{ |
| 478 |
VNDX vi; |
| 479 |
FLOAT *p0, *p1; |
| 480 |
FVECT v1, v2, nsum, newn; |
| 481 |
double d; |
| 482 |
register int i; |
| 483 |
|
| 484 |
if (!cvtndx(vi, av[0])) |
| 485 |
return(0); |
| 486 |
if (vi[2] >= 0) |
| 487 |
return(1); /* has interpolated normals */ |
| 488 |
if (ac < 4) |
| 489 |
return(0); /* it's a triangle! */ |
| 490 |
/* set up */ |
| 491 |
p0 = vlist[vi[0]]; |
| 492 |
if (!cvtndx(vi, av[1])) |
| 493 |
return(0); /* error gets caught later */ |
| 494 |
nsum[0] = nsum[1] = nsum[2] = 0.; |
| 495 |
p1 = vlist[vi[0]]; |
| 496 |
fvsum(v2, p1, p0, -1.0); |
| 497 |
for (i = 2; i < ac; i++) { |
| 498 |
VCOPY(v1, v2); |
| 499 |
if (!cvtndx(vi, av[i])) |
| 500 |
return(0); |
| 501 |
p1 = vlist[vi[0]]; |
| 502 |
fvsum(v2, p1, p0, -1.0); |
| 503 |
fcross(newn, v1, v2); |
| 504 |
if (normalize(newn) == 0.0) { |
| 505 |
if (i < 3) |
| 506 |
return(1); /* can't deal with this */ |
| 507 |
fvsum(nsum, nsum, nsum, 1./(i-2)); |
| 508 |
continue; |
| 509 |
} |
| 510 |
d = fdot(newn,nsum); |
| 511 |
if (d >= 0) { |
| 512 |
if (d < (1.0-FTINY)*(i-2)) |
| 513 |
return(1); |
| 514 |
fvsum(nsum, nsum, newn, 1.0); |
| 515 |
} else { |
| 516 |
if (d > -(1.0-FTINY)*(i-2)) |
| 517 |
return(1); |
| 518 |
fvsum(nsum, nsum, newn, -1.0); |
| 519 |
} |
| 520 |
} |
| 521 |
return(0); |
| 522 |
} |
| 523 |
|
| 524 |
|
| 525 |
putface(ac, av) /* put out an N-sided polygon */ |
| 526 |
int ac; |
| 527 |
register char **av; |
| 528 |
{ |
| 529 |
VNDX vi; |
| 530 |
char *mod; |
| 531 |
register int i; |
| 532 |
|
| 533 |
if (nonplanar(ac, av)) { /* break into quads and triangles */ |
| 534 |
while (ac > 3) { |
| 535 |
if (!putquad(av[0], av[1], av[2], av[3])) |
| 536 |
return(0); |
| 537 |
/* remove two vertices & rotate */ |
| 538 |
av[ac -= 2] = av[0]; |
| 539 |
for (i = 0; i <= ac; i++) |
| 540 |
av[i] = av[i+2]; |
| 541 |
} |
| 542 |
if (ac == 3 && !puttri(av[0], av[1], av[2])) |
| 543 |
return(0); |
| 544 |
return(1); |
| 545 |
} |
| 546 |
if ((mod = getmtl()) == NULL) |
| 547 |
return(-1); |
| 548 |
printf("\n%s polygon %s.%d\n", mod, getonm(), faceno); |
| 549 |
printf("0\n0\n%d\n", 3*ac); |
| 550 |
for (i = 0; i < ac; i++) { |
| 551 |
if (!cvtndx(vi, av[i])) |
| 552 |
return(0); |
| 553 |
pvect(vlist[vi[0]]); |
| 554 |
} |
| 555 |
return(1); |
| 556 |
} |
| 557 |
|
| 558 |
|
| 559 |
puttri(v1, v2, v3) /* put out a triangle */ |
| 560 |
char *v1, *v2, *v3; |
| 561 |
{ |
| 562 |
char *mod; |
| 563 |
VNDX v1i, v2i, v3i; |
| 564 |
BARYCCM bvecs; |
| 565 |
int texOK, patOK; |
| 566 |
|
| 567 |
if ((mod = getmtl()) == NULL) |
| 568 |
return(-1); |
| 569 |
|
| 570 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
| 571 |
return(0); |
| 572 |
/* compute barycentric coordinates */ |
| 573 |
texOK = (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0); |
| 574 |
patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0); |
| 575 |
if (texOK | patOK) |
| 576 |
if (comp_baryc(bvecs, vlist[v1i[0]], vlist[v2i[0]], |
| 577 |
vlist[v3i[0]]) < 0) |
| 578 |
return(-1); |
| 579 |
/* put out texture (if any) */ |
| 580 |
if (texOK) { |
| 581 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 582 |
mod = TEXNAME; |
| 583 |
printf("4 dx dy dz %s\n", TCALNAME); |
| 584 |
printf("0\n21\n"); |
| 585 |
put_baryc(bvecs); |
| 586 |
printf("\t%14.12g %14.12g %14.12g\n", |
| 587 |
vnlist[v1i[2]][0], vnlist[v2i[2]][0], |
| 588 |
vnlist[v3i[2]][0]); |
| 589 |
printf("\t%14.12g %14.12g %14.12g\n", |
| 590 |
vnlist[v1i[2]][1], vnlist[v2i[2]][1], |
| 591 |
vnlist[v3i[2]][1]); |
| 592 |
printf("\t%14.12g %14.12g %14.12g\n", |
| 593 |
vnlist[v1i[2]][2], vnlist[v2i[2]][2], |
| 594 |
vnlist[v3i[2]][2]); |
| 595 |
} |
| 596 |
/* put out pattern (if any) */ |
| 597 |
if (patOK) { |
| 598 |
printf("\n%s colorpict %s\n", mod, PATNAME); |
| 599 |
mod = PATNAME; |
| 600 |
printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME); |
| 601 |
printf("0\n18\n"); |
| 602 |
put_baryc(bvecs); |
| 603 |
printf("\t%f %f %f\n", vtlist[v1i[1]][0], |
| 604 |
vtlist[v2i[1]][0], vtlist[v3i[1]][0]); |
| 605 |
printf("\t%f %f %f\n", vtlist[v1i[1]][1], |
| 606 |
vtlist[v2i[1]][1], vtlist[v3i[1]][1]); |
| 607 |
} |
| 608 |
/* put out triangle */ |
| 609 |
printf("\n%s polygon %s.%d\n", mod, getonm(), faceno); |
| 610 |
printf("0\n0\n9\n"); |
| 611 |
pvect(vlist[v1i[0]]); |
| 612 |
pvect(vlist[v2i[0]]); |
| 613 |
pvect(vlist[v3i[0]]); |
| 614 |
|
| 615 |
return(1); |
| 616 |
} |
| 617 |
|
| 618 |
|
| 619 |
int |
| 620 |
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
| 621 |
register BARYCCM bcm; |
| 622 |
FLOAT *v1, *v2, *v3; |
| 623 |
{ |
| 624 |
FLOAT *vt; |
| 625 |
FVECT va, vab, vcb; |
| 626 |
double d; |
| 627 |
register int i, j; |
| 628 |
|
| 629 |
for (j = 0; j < 3; j++) { |
| 630 |
for (i = 0; i < 3; i++) { |
| 631 |
vab[i] = v1[i] - v2[i]; |
| 632 |
vcb[i] = v3[i] - v2[i]; |
| 633 |
} |
| 634 |
d = DOT(vcb,vcb); |
| 635 |
if (d <= FTINY) |
| 636 |
return(-1); |
| 637 |
d = DOT(vcb,vab)/d; |
| 638 |
for (i = 0; i < 3; i++) |
| 639 |
va[i] = vab[i] - vcb[i]*d; |
| 640 |
d = DOT(va,va); |
| 641 |
if (d <= FTINY) |
| 642 |
return(-1); |
| 643 |
for (i = 0; i < 3; i++) { |
| 644 |
va[i] /= d; |
| 645 |
bcm[j][i] = va[i]; |
| 646 |
} |
| 647 |
bcm[j][3] = -DOT(v2,va); |
| 648 |
/* rotate vertices */ |
| 649 |
vt = v1; |
| 650 |
v1 = v2; |
| 651 |
v2 = v3; |
| 652 |
v3 = vt; |
| 653 |
} |
| 654 |
return(0); |
| 655 |
} |
| 656 |
|
| 657 |
|
| 658 |
put_baryc(bcm) /* put barycentric coord. vectors */ |
| 659 |
register BARYCCM bcm; |
| 660 |
{ |
| 661 |
register int i; |
| 662 |
|
| 663 |
for (i = 0; i < 3; i++) |
| 664 |
printf("%14.8f %14.8f %14.8f %14.8f\n", |
| 665 |
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
| 666 |
} |
| 667 |
|
| 668 |
|
| 669 |
putquad(p0, p1, p3, p2) /* put out a quadrilateral */ |
| 670 |
char *p0, *p1, *p3, *p2; /* names correspond to binary pos. */ |
| 671 |
{ |
| 672 |
VNDX p0i, p1i, p2i, p3i; |
| 673 |
FVECT norm[4]; |
| 674 |
char *mod, *name; |
| 675 |
int axis; |
| 676 |
FVECT v1, v2, vc1, vc2; |
| 677 |
int ok1, ok2; |
| 678 |
|
| 679 |
if ((mod = getmtl()) == NULL) |
| 680 |
return(-1); |
| 681 |
name = getonm(); |
| 682 |
/* get actual indices */ |
| 683 |
if (!cvtndx(p0i,p0) || !cvtndx(p1i,p1) || |
| 684 |
!cvtndx(p2i,p2) || !cvtndx(p3i,p3)) |
| 685 |
return(0); |
| 686 |
/* compute exact normals */ |
| 687 |
fvsum(v1, vlist[p1i[0]], vlist[p0i[0]], -1.0); |
| 688 |
fvsum(v2, vlist[p2i[0]], vlist[p0i[0]], -1.0); |
| 689 |
fcross(vc1, v1, v2); |
| 690 |
ok1 = normalize(vc1) != 0.0; |
| 691 |
fvsum(v1, vlist[p2i[0]], vlist[p3i[0]], -1.0); |
| 692 |
fvsum(v2, vlist[p1i[0]], vlist[p3i[0]], -1.0); |
| 693 |
fcross(vc2, v1, v2); |
| 694 |
ok2 = normalize(vc2) != 0.0; |
| 695 |
if (!(ok1 | ok2)) |
| 696 |
return(-1); |
| 697 |
/* compute normal interpolation */ |
| 698 |
axis = norminterp(norm, p0i, p1i, p2i, p3i); |
| 699 |
|
| 700 |
/* put out quadrilateral? */ |
| 701 |
if (ok1 & ok2 && fabs(fdot(vc1,vc2)) >= 1.0-FTINY) { |
| 702 |
printf("\n%s ", mod); |
| 703 |
if (axis != -1) { |
| 704 |
printf("texfunc %s\n", TEXNAME); |
| 705 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 706 |
printf("0\n13\t%d\n", axis); |
| 707 |
pvect(norm[0]); |
| 708 |
pvect(norm[1]); |
| 709 |
pvect(norm[2]); |
| 710 |
fvsum(v1, norm[3], vc1, -0.5); |
| 711 |
fvsum(v1, v1, vc2, -0.5); |
| 712 |
pvect(v1); |
| 713 |
printf("\n%s ", TEXNAME); |
| 714 |
} |
| 715 |
printf("polygon %s.%d\n", name, faceno); |
| 716 |
printf("0\n0\n12\n"); |
| 717 |
pvect(vlist[p0i[0]]); |
| 718 |
pvect(vlist[p1i[0]]); |
| 719 |
pvect(vlist[p3i[0]]); |
| 720 |
pvect(vlist[p2i[0]]); |
| 721 |
return(1); |
| 722 |
} |
| 723 |
/* put out triangles? */ |
| 724 |
if (ok1) { |
| 725 |
printf("\n%s ", mod); |
| 726 |
if (axis != -1) { |
| 727 |
printf("texfunc %s\n", TEXNAME); |
| 728 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 729 |
printf("0\n13\t%d\n", axis); |
| 730 |
pvect(norm[0]); |
| 731 |
pvect(norm[1]); |
| 732 |
pvect(norm[2]); |
| 733 |
fvsum(v1, norm[3], vc1, -1.0); |
| 734 |
pvect(v1); |
| 735 |
printf("\n%s ", TEXNAME); |
| 736 |
} |
| 737 |
printf("polygon %s.%da\n", name, faceno); |
| 738 |
printf("0\n0\n9\n"); |
| 739 |
pvect(vlist[p0i[0]]); |
| 740 |
pvect(vlist[p1i[0]]); |
| 741 |
pvect(vlist[p2i[0]]); |
| 742 |
} |
| 743 |
if (ok2) { |
| 744 |
printf("\n%s ", mod); |
| 745 |
if (axis != -1) { |
| 746 |
printf("texfunc %s\n", TEXNAME); |
| 747 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 748 |
printf("0\n13\t%d\n", axis); |
| 749 |
pvect(norm[0]); |
| 750 |
pvect(norm[1]); |
| 751 |
pvect(norm[2]); |
| 752 |
fvsum(v2, norm[3], vc2, -1.0); |
| 753 |
pvect(v2); |
| 754 |
printf("\n%s ", TEXNAME); |
| 755 |
} |
| 756 |
printf("polygon %s.%db\n", name, faceno); |
| 757 |
printf("0\n0\n9\n"); |
| 758 |
pvect(vlist[p2i[0]]); |
| 759 |
pvect(vlist[p1i[0]]); |
| 760 |
pvect(vlist[p3i[0]]); |
| 761 |
} |
| 762 |
return(1); |
| 763 |
} |
| 764 |
|
| 765 |
|
| 766 |
int |
| 767 |
norminterp(resmat, p0i, p1i, p2i, p3i) /* compute normal interpolation */ |
| 768 |
register FVECT resmat[4]; |
| 769 |
register VNDX p0i, p1i, p2i, p3i; |
| 770 |
{ |
| 771 |
#define u ((ax+1)%3) |
| 772 |
#define v ((ax+2)%3) |
| 773 |
|
| 774 |
register int ax; |
| 775 |
MAT4 eqnmat; |
| 776 |
FVECT v1; |
| 777 |
register int i, j; |
| 778 |
|
| 779 |
if (!(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0)) |
| 780 |
return(-1); |
| 781 |
/* find dominant axis */ |
| 782 |
VCOPY(v1, vnlist[p0i[2]]); |
| 783 |
fvsum(v1, v1, vnlist[p1i[2]], 1.0); |
| 784 |
fvsum(v1, v1, vnlist[p2i[2]], 1.0); |
| 785 |
fvsum(v1, v1, vnlist[p3i[2]], 1.0); |
| 786 |
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
| 787 |
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
| 788 |
/* assign equation matrix */ |
| 789 |
eqnmat[0][0] = vlist[p0i[0]][u]*vlist[p0i[0]][v]; |
| 790 |
eqnmat[0][1] = vlist[p0i[0]][u]; |
| 791 |
eqnmat[0][2] = vlist[p0i[0]][v]; |
| 792 |
eqnmat[0][3] = 1.0; |
| 793 |
eqnmat[1][0] = vlist[p1i[0]][u]*vlist[p1i[0]][v]; |
| 794 |
eqnmat[1][1] = vlist[p1i[0]][u]; |
| 795 |
eqnmat[1][2] = vlist[p1i[0]][v]; |
| 796 |
eqnmat[1][3] = 1.0; |
| 797 |
eqnmat[2][0] = vlist[p2i[0]][u]*vlist[p2i[0]][v]; |
| 798 |
eqnmat[2][1] = vlist[p2i[0]][u]; |
| 799 |
eqnmat[2][2] = vlist[p2i[0]][v]; |
| 800 |
eqnmat[2][3] = 1.0; |
| 801 |
eqnmat[3][0] = vlist[p3i[0]][u]*vlist[p3i[0]][v]; |
| 802 |
eqnmat[3][1] = vlist[p3i[0]][u]; |
| 803 |
eqnmat[3][2] = vlist[p3i[0]][v]; |
| 804 |
eqnmat[3][3] = 1.0; |
| 805 |
/* invert matrix (solve system) */ |
| 806 |
if (!invmat4(eqnmat, eqnmat)) |
| 807 |
return(-1); /* no solution */ |
| 808 |
/* compute result matrix */ |
| 809 |
for (j = 0; j < 4; j++) |
| 810 |
for (i = 0; i < 3; i++) |
| 811 |
resmat[j][i] = eqnmat[j][0]*vnlist[p0i[2]][i] + |
| 812 |
eqnmat[j][1]*vnlist[p1i[2]][i] + |
| 813 |
eqnmat[j][2]*vnlist[p2i[2]][i] + |
| 814 |
eqnmat[j][3]*vnlist[p3i[2]][i]; |
| 815 |
return(ax); |
| 816 |
|
| 817 |
#undef u |
| 818 |
#undef v |
| 819 |
} |
| 820 |
|
| 821 |
|
| 822 |
freeverts() /* free all vertices */ |
| 823 |
{ |
| 824 |
if (nvs) { |
| 825 |
free((char *)vlist); |
| 826 |
nvs = 0; |
| 827 |
} |
| 828 |
if (nvts) { |
| 829 |
free((char *)vtlist); |
| 830 |
nvts = 0; |
| 831 |
} |
| 832 |
if (nvns) { |
| 833 |
free((char *)vnlist); |
| 834 |
nvns = 0; |
| 835 |
} |
| 836 |
} |
| 837 |
|
| 838 |
|
| 839 |
int |
| 840 |
newv(x, y, z) /* create a new vertex */ |
| 841 |
double x, y, z; |
| 842 |
{ |
| 843 |
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
| 844 |
if (nvs == 0) |
| 845 |
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 846 |
else |
| 847 |
vlist = (FVECT *)realloc((char *)vlist, |
| 848 |
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
| 849 |
if (vlist == NULL) { |
| 850 |
fprintf(stderr, |
| 851 |
"Out of memory while allocating vertex %d\n", nvs); |
| 852 |
exit(1); |
| 853 |
} |
| 854 |
} |
| 855 |
/* assign new vertex */ |
| 856 |
vlist[nvs][0] = x; |
| 857 |
vlist[nvs][1] = y; |
| 858 |
vlist[nvs][2] = z; |
| 859 |
return(++nvs); |
| 860 |
} |
| 861 |
|
| 862 |
|
| 863 |
int |
| 864 |
newvn(x, y, z) /* create a new vertex normal */ |
| 865 |
double x, y, z; |
| 866 |
{ |
| 867 |
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
| 868 |
if (nvns == 0) |
| 869 |
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 870 |
else |
| 871 |
vnlist = (FVECT *)realloc((char *)vnlist, |
| 872 |
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
| 873 |
if (vnlist == NULL) { |
| 874 |
fprintf(stderr, |
| 875 |
"Out of memory while allocating normal %d\n", nvns); |
| 876 |
exit(1); |
| 877 |
} |
| 878 |
} |
| 879 |
/* assign new normal */ |
| 880 |
vnlist[nvns][0] = x; |
| 881 |
vnlist[nvns][1] = y; |
| 882 |
vnlist[nvns][2] = z; |
| 883 |
if (normalize(vnlist[nvns]) == 0.0) |
| 884 |
return(0); |
| 885 |
return(++nvns); |
| 886 |
} |
| 887 |
|
| 888 |
|
| 889 |
int |
| 890 |
newvt(x, y) /* create a new texture map vertex */ |
| 891 |
double x, y; |
| 892 |
{ |
| 893 |
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
| 894 |
if (nvts == 0) |
| 895 |
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
| 896 |
else |
| 897 |
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
| 898 |
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
| 899 |
if (vtlist == NULL) { |
| 900 |
fprintf(stderr, |
| 901 |
"Out of memory while allocating texture vertex %d\n", |
| 902 |
nvts); |
| 903 |
exit(1); |
| 904 |
} |
| 905 |
} |
| 906 |
/* assign new vertex */ |
| 907 |
vtlist[nvts][0] = x; |
| 908 |
vtlist[nvts][1] = y; |
| 909 |
return(++nvts); |
| 910 |
} |
| 911 |
|
| 912 |
|
| 913 |
syntax(er) /* report syntax error and exit */ |
| 914 |
char *er; |
| 915 |
{ |
| 916 |
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
| 917 |
inpfile, lineno, er); |
| 918 |
exit(1); |
| 919 |
} |
