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, and faces |
11 |
* must be either quads or triangles for smoothing to work. |
12 |
* Also, texture indices only work for triangles, though |
13 |
* I'm not sure they work correctly. |
14 |
*/ |
15 |
|
16 |
#include "standard.h" |
17 |
|
18 |
#include <ctype.h> |
19 |
|
20 |
#define VOIDID "void" /* this is defined in object.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 |
|
27 |
#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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 |
FLOAT (*vtlist)[2]; /* texture vertex list */ |
36 |
int nvts; |
37 |
|
38 |
typedef FLOAT BARYCCM[3][4]; /* barycentric coordinate system */ |
39 |
|
40 |
typedef int VNDX[3]; /* vertex index (point,texture,normal) */ |
41 |
|
42 |
#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
43 |
|
44 |
#define MAXARG 64 /* maximum # arguments in a statement */ |
45 |
|
46 |
char *defmat = VOIDID; /* default (starting) material name */ |
47 |
char *defpat = ""; /* default (starting) picture name */ |
48 |
char *defobj = "F"; /* default (starting) object name */ |
49 |
|
50 |
char picfile[128]; /* current picture file */ |
51 |
char matname[64]; /* current material name */ |
52 |
char objname[128]; /* current object name */ |
53 |
int lineno; /* current line number */ |
54 |
|
55 |
int nfaces; /* total number of faces output */ |
56 |
|
57 |
|
58 |
main(argc, argv) /* read in T-mesh files and convert */ |
59 |
int argc; |
60 |
char *argv[]; |
61 |
{ |
62 |
FILE *fp; |
63 |
int i; |
64 |
|
65 |
for (i = 1; i < argc && argv[i][0] == '-'; i++) |
66 |
switch (argv[i][1]) { |
67 |
case 'o': /* object name */ |
68 |
defobj = argv[++i]; |
69 |
break; |
70 |
case 'm': /* default material */ |
71 |
defmat = argv[++i]; |
72 |
break; |
73 |
case 'p': /* default picture */ |
74 |
defpat = argv[++i]; |
75 |
break; |
76 |
default: |
77 |
fprintf(stderr, |
78 |
"Usage: %s [-o obj][-m mat][-p pic] [file ..]\n", |
79 |
argv[0]); |
80 |
exit(1); |
81 |
} |
82 |
if (i >= argc) |
83 |
convert("<stdin>", stdin); |
84 |
else |
85 |
for ( ; i < argc; i++) { |
86 |
if ((fp = fopen(argv[i], "r")) == NULL) { |
87 |
perror(argv[i]); |
88 |
exit(1); |
89 |
} |
90 |
convert(argv[i], fp); |
91 |
fclose(fp); |
92 |
} |
93 |
exit(0); |
94 |
} |
95 |
|
96 |
|
97 |
convert(fname, fp) /* convert a T-mesh */ |
98 |
char *fname; |
99 |
FILE *fp; |
100 |
{ |
101 |
char *argv[MAXARG]; |
102 |
int argc; |
103 |
int nstats, nunknown; |
104 |
register int i; |
105 |
/* start fresh */ |
106 |
freeverts(); |
107 |
strcpy(picfile, defpat); |
108 |
strcpy(matname, defmat); |
109 |
strcpy(objname, defobj); |
110 |
lineno = 0; |
111 |
nstats = nunknown = 0; |
112 |
|
113 |
printf("\n# Wavefront file read from: %s\n", fname); |
114 |
/* scan until EOF */ |
115 |
while (argc = getstmt(argv, fp)) { |
116 |
switch (argv[0][0]) { |
117 |
case 'v': /* vertex */ |
118 |
switch (argv[0][1]) { |
119 |
case '\0': /* point */ |
120 |
if (badarg(argc-1,argv+1,"fff")) |
121 |
syntax(fname, lineno, "Bad vertex"); |
122 |
newv(atof(argv[1]), atof(argv[2]), |
123 |
atof(argv[3])); |
124 |
break; |
125 |
case 'n': /* normal */ |
126 |
if (argv[0][2]) |
127 |
goto unknown; |
128 |
if (badarg(argc-1,argv+1,"fff")) |
129 |
syntax(fname, lineno, "Bad normal"); |
130 |
if (!newvn(atof(argv[1]), atof(argv[2]), |
131 |
atof(argv[3]))) |
132 |
syntax(fname, lineno, "Zero normal"); |
133 |
break; |
134 |
case 't': /* texture */ |
135 |
if (argv[0][2]) |
136 |
goto unknown; |
137 |
if (badarg(argc-1,argv+1,"ff")) |
138 |
goto unknown; |
139 |
newvt(atof(argv[1]), atof(argv[2])); |
140 |
break; |
141 |
default: |
142 |
goto unknown; |
143 |
} |
144 |
break; |
145 |
case 'f': /* face */ |
146 |
if (argv[0][1]) |
147 |
goto unknown; |
148 |
switch (argc-1) { |
149 |
case 0: case 1: case 2: |
150 |
syntax(fname, lineno, "Too few vertices"); |
151 |
break; |
152 |
case 3: |
153 |
if (!puttri(argv[1], argv[2], argv[3])) |
154 |
syntax(fname, lineno, "Bad triangle"); |
155 |
break; |
156 |
case 4: |
157 |
if (!putquad(argv[1], argv[2], |
158 |
argv[3], argv[4])) |
159 |
syntax(fname, lineno, "Bad quad"); |
160 |
break; |
161 |
default: |
162 |
if (!putface(argc-1, argv+1)) |
163 |
syntax(fname, lineno, "Bad face"); |
164 |
break; |
165 |
} |
166 |
break; |
167 |
case 'u': |
168 |
if (!strcmp(argv[0], "usemtl")) { /* material */ |
169 |
if (argc < 2) |
170 |
break; /* not fatal */ |
171 |
strcpy(matname, argv[1]); |
172 |
} else if (!strcmp(argv[0], "usemap")) {/* map */ |
173 |
if (argc < 2) |
174 |
break; /* not fatal */ |
175 |
if (!strcmp(argv[1], "off")) |
176 |
picfile[0] = '\0'; |
177 |
else |
178 |
strcpy(picfile, argv[1]); |
179 |
} else |
180 |
goto unknown; |
181 |
break; |
182 |
case 'o': /* object name */ |
183 |
if (argv[0][1]) |
184 |
goto unknown; |
185 |
if (argc < 2) |
186 |
break; /* not fatal */ |
187 |
strcpy(objname, argv[1]); |
188 |
break; |
189 |
case 'g': /* group name(s) */ |
190 |
if (argv[0][1]) |
191 |
goto unknown; |
192 |
if (argc < 2) |
193 |
break; /* not fatal */ |
194 |
objname[0] = '\0'; |
195 |
for (i = 1; i < argc; i++) |
196 |
if (objname[0]) |
197 |
sprintf(objname+strlen(objname), |
198 |
".%s", argv[i]); |
199 |
else |
200 |
strcpy(objname, argv[i]); |
201 |
break; |
202 |
case '#': /* comment */ |
203 |
break; |
204 |
default:; /* something we don't deal with */ |
205 |
unknown: |
206 |
nunknown++; |
207 |
break; |
208 |
} |
209 |
nstats++; |
210 |
} |
211 |
printf("# Done processing file: %s\n", fname); |
212 |
printf("# %d lines, %d statements, %d unrecognized\n", |
213 |
lineno, nstats, nunknown); |
214 |
} |
215 |
|
216 |
|
217 |
int |
218 |
getstmt(av, fp) /* read the next statement from fp */ |
219 |
register char *av[MAXARG]; |
220 |
FILE *fp; |
221 |
{ |
222 |
extern char *fgetline(); |
223 |
static char sbuf[MAXARG*10]; |
224 |
register char *cp; |
225 |
register int i; |
226 |
|
227 |
do { |
228 |
if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
229 |
return(0); |
230 |
i = 0; |
231 |
for ( ; ; ) { |
232 |
while (isspace(*cp) || *cp == '\\') { |
233 |
if (*cp == '\n') |
234 |
lineno++; |
235 |
*cp++ = '\0'; |
236 |
} |
237 |
if (!*cp || i >= MAXARG-1) |
238 |
break; |
239 |
av[i++] = cp; |
240 |
while (*++cp && !isspace(*cp)) |
241 |
; |
242 |
} |
243 |
av[i] = NULL; |
244 |
lineno++; |
245 |
} while (!i); |
246 |
|
247 |
return(i); |
248 |
} |
249 |
|
250 |
|
251 |
cvtndx(vi, vs) /* convert vertex string to index */ |
252 |
register VNDX vi; |
253 |
register char *vs; |
254 |
{ |
255 |
/* get point */ |
256 |
vi[0] = atoi(vs); |
257 |
if (vi[0] > 0) { |
258 |
if (vi[0]-- > nvs) |
259 |
return(0); |
260 |
} else if (vi[0] < 0) { |
261 |
vi[0] = nvs + vi[0]; |
262 |
if (vi[0] < 0) |
263 |
return(0); |
264 |
} else |
265 |
return(0); |
266 |
/* get texture */ |
267 |
while (*vs) |
268 |
if (*vs++ == '/') |
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break; |
270 |
vi[1] = atoi(vs); |
271 |
if (vi[1] > 0) { |
272 |
if (vi[1]-- > nvts) |
273 |
return(0); |
274 |
} else if (vi[1] < 0) { |
275 |
vi[1] = nvts + vi[1]; |
276 |
if (vi[1] < 0) |
277 |
return(0); |
278 |
} else |
279 |
vi[1] = -1; |
280 |
/* get normal */ |
281 |
while (*vs) |
282 |
if (*vs++ == '/') |
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break; |
284 |
vi[2] = atoi(vs); |
285 |
if (vi[2] > 0) { |
286 |
if (vi[2]-- > nvns) |
287 |
return(0); |
288 |
} else if (vi[2] < 0) { |
289 |
vi[2] = nvns + vi[2]; |
290 |
if (vi[2] < 0) |
291 |
return(0); |
292 |
} else |
293 |
vi[2] = -1; |
294 |
return(1); |
295 |
} |
296 |
|
297 |
|
298 |
putface(ac, av) /* put out an N-sided polygon */ |
299 |
register int ac; |
300 |
register char **av; |
301 |
{ |
302 |
VNDX vi; |
303 |
|
304 |
printf("\n%s polygon %s.%d\n", matname, objname, ++nfaces); |
305 |
printf("0\n0\n%d\n", 3*ac); |
306 |
while (ac--) { |
307 |
if (!cvtndx(vi, *av++)) |
308 |
return(0); |
309 |
pvect(vlist[vi[0]]); |
310 |
} |
311 |
return(1); |
312 |
} |
313 |
|
314 |
|
315 |
puttri(v1, v2, v3) /* put out a triangle */ |
316 |
char *v1, *v2, *v3; |
317 |
{ |
318 |
char *mod = matname; |
319 |
VNDX v1i, v2i, v3i; |
320 |
BARYCCM bvecs; |
321 |
|
322 |
if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
323 |
return(0); |
324 |
/* compute barycentric coordinates */ |
325 |
if ((v1i[2]>=0&&v2i[2]>=0&&v3i[2]>=0) || |
326 |
(v1i[1]>=0&&v2i[1]>=0&&v3i[1]>=0)) |
327 |
if (comp_baryc(bvecs, vlist[v1i[0]], vlist[v2i[0]], |
328 |
vlist[v3i[0]]) < 0) |
329 |
return(0); |
330 |
/* put out texture (if any) */ |
331 |
if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) { |
332 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
333 |
mod = TEXNAME; |
334 |
printf("4 dx dy dz %s\n", TCALNAME); |
335 |
printf("0\n21\n"); |
336 |
put_baryc(bvecs); |
337 |
printf("\t%14.12g %14.12g %14.12g\n", |
338 |
vnlist[v1i[2]][0], vnlist[v2i[2]][0], |
339 |
vnlist[v3i[2]][0]); |
340 |
printf("\t%14.12g %14.12g %14.12g\n", |
341 |
vnlist[v1i[2]][1], vnlist[v2i[2]][1], |
342 |
vnlist[v3i[2]][1]); |
343 |
printf("\t%14.12g %14.12g %14.12g\n", |
344 |
vnlist[v1i[2]][2], vnlist[v2i[2]][2], |
345 |
vnlist[v3i[2]][2]); |
346 |
} |
347 |
/* put out pattern (if any) */ |
348 |
if (picfile[0] && v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0) { |
349 |
printf("\n%s colorpict %s\n", mod, PATNAME); |
350 |
mod = PATNAME; |
351 |
printf("7 noneg noneg noneg %s %s u v\n", picfile, TCALNAME); |
352 |
printf("0\n18\n"); |
353 |
put_baryc(bvecs); |
354 |
printf("\t%f %f %f\n", vtlist[v1i[1]][0], |
355 |
vtlist[v2i[1]][0], vtlist[v3i[1]][0]); |
356 |
printf("\t%f %f %f\n", vtlist[v1i[1]][1], |
357 |
vtlist[v2i[1]][1], vtlist[v3i[1]][1]); |
358 |
} |
359 |
/* put out triangle */ |
360 |
printf("\n%s polygon %s.%d\n", matname, objname, ++nfaces); |
361 |
printf("0\n0\n9\n"); |
362 |
pvect(vlist[v1i[0]]); |
363 |
pvect(vlist[v2i[0]]); |
364 |
pvect(vlist[v3i[0]]); |
365 |
|
366 |
return(1); |
367 |
} |
368 |
|
369 |
|
370 |
int |
371 |
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
372 |
register BARYCCM bcm; |
373 |
FLOAT *v1, *v2, *v3; |
374 |
{ |
375 |
FLOAT *vt; |
376 |
FVECT va, vab, vcb; |
377 |
double d; |
378 |
register int i, j; |
379 |
|
380 |
for (j = 0; j < 3; j++) { |
381 |
for (i = 0; i < 3; i++) { |
382 |
vab[i] = v1[i] - v2[i]; |
383 |
vcb[i] = v3[i] - v2[i]; |
384 |
} |
385 |
d = DOT(vcb,vcb); |
386 |
if (d <= FTINY) |
387 |
return(-1); |
388 |
d = DOT(vcb,vab)/d; |
389 |
for (i = 0; i < 3; i++) |
390 |
va[i] = vab[i] - vcb[i]*d; |
391 |
d = DOT(va,va); |
392 |
if (d <= FTINY) |
393 |
return(-1); |
394 |
for (i = 0; i < 3; i++) { |
395 |
va[i] /= d; |
396 |
bcm[j][i] = va[i]; |
397 |
} |
398 |
bcm[j][3] = -DOT(v2,va); |
399 |
/* rotate vertices */ |
400 |
vt = v1; |
401 |
v1 = v2; |
402 |
v2 = v3; |
403 |
v3 = vt; |
404 |
} |
405 |
return(0); |
406 |
} |
407 |
|
408 |
|
409 |
put_baryc(bcm) /* put barycentric coord. vectors */ |
410 |
register BARYCCM bcm; |
411 |
{ |
412 |
register int i; |
413 |
|
414 |
for (i = 0; i < 3; i++) |
415 |
printf("%14.8f %14.8f %14.8f %14.8f\n", |
416 |
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
417 |
} |
418 |
|
419 |
|
420 |
putquad(p0, p1, p2, p3) /* put out a quadrilateral */ |
421 |
char *p0, *p1, *p2, *p3; |
422 |
{ |
423 |
VNDX p0i, p1i, p2i, p3i; |
424 |
FVECT norm[4]; |
425 |
int axis; |
426 |
FVECT v1, v2, vc1, vc2; |
427 |
int ok1, ok2; |
428 |
/* get actual indices */ |
429 |
if (!cvtndx(p0i,p0) || !cvtndx(p1i,p1) || |
430 |
!cvtndx(p2i,p2) || !cvtndx(p3i,p3)) |
431 |
return(0); |
432 |
/* compute exact normals */ |
433 |
fvsum(v1, vlist[p1i[0]], vlist[p0i[0]], -1.0); |
434 |
fvsum(v2, vlist[p2i[0]], vlist[p0i[0]], -1.0); |
435 |
fcross(vc1, v1, v2); |
436 |
ok1 = normalize(vc1) != 0.0; |
437 |
fvsum(v1, vlist[p2i[0]], vlist[p3i[0]], -1.0); |
438 |
fvsum(v2, vlist[p1i[0]], vlist[p3i[0]], -1.0); |
439 |
fcross(vc2, v1, v2); |
440 |
ok2 = normalize(vc2) != 0.0; |
441 |
if (!(ok1 | ok2)) |
442 |
return(0); |
443 |
/* compute normal interpolation */ |
444 |
axis = norminterp(norm, p0i, p1i, p2i, p3i); |
445 |
|
446 |
/* put out quadrilateral? */ |
447 |
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
448 |
printf("\n%s ", matname); |
449 |
if (axis != -1) { |
450 |
printf("texfunc %s\n", TEXNAME); |
451 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
452 |
printf("0\n13\t%d\n", axis); |
453 |
pvect(norm[0]); |
454 |
pvect(norm[1]); |
455 |
pvect(norm[2]); |
456 |
fvsum(v1, norm[3], vc1, -0.5); |
457 |
fvsum(v1, v1, vc2, -0.5); |
458 |
pvect(v1); |
459 |
printf("\n%s ", TEXNAME); |
460 |
} |
461 |
printf("polygon %s.%d\n", objname, ++nfaces); |
462 |
printf("0\n0\n12\n"); |
463 |
pvect(vlist[p0i[0]]); |
464 |
pvect(vlist[p1i[0]]); |
465 |
pvect(vlist[p3i[0]]); |
466 |
pvect(vlist[p2i[0]]); |
467 |
return(1); |
468 |
} |
469 |
/* put out triangles? */ |
470 |
if (ok1) { |
471 |
printf("\n%s ", matname); |
472 |
if (axis != -1) { |
473 |
printf("texfunc %s\n", TEXNAME); |
474 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
475 |
printf("0\n13\t%d\n", axis); |
476 |
pvect(norm[0]); |
477 |
pvect(norm[1]); |
478 |
pvect(norm[2]); |
479 |
fvsum(v1, norm[3], vc1, -1.0); |
480 |
pvect(v1); |
481 |
printf("\n%s ", TEXNAME); |
482 |
} |
483 |
printf("polygon %s.%d\n", objname, ++nfaces); |
484 |
printf("0\n0\n9\n"); |
485 |
pvect(vlist[p0i[0]]); |
486 |
pvect(vlist[p1i[0]]); |
487 |
pvect(vlist[p2i[0]]); |
488 |
} |
489 |
if (ok2) { |
490 |
printf("\n%s ", matname); |
491 |
if (axis != -1) { |
492 |
printf("texfunc %s\n", TEXNAME); |
493 |
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
494 |
printf("0\n13\t%d\n", axis); |
495 |
pvect(norm[0]); |
496 |
pvect(norm[1]); |
497 |
pvect(norm[2]); |
498 |
fvsum(v2, norm[3], vc2, -1.0); |
499 |
pvect(v2); |
500 |
printf("\n%s ", TEXNAME); |
501 |
} |
502 |
printf("polygon %s.%d\n", objname, ++nfaces); |
503 |
printf("0\n0\n9\n"); |
504 |
pvect(vlist[p2i[0]]); |
505 |
pvect(vlist[p1i[0]]); |
506 |
pvect(vlist[p3i[0]]); |
507 |
} |
508 |
return(1); |
509 |
} |
510 |
|
511 |
|
512 |
int |
513 |
norminterp(resmat, p0i, p1i, p2i, p3i) /* compute normal interpolation */ |
514 |
register FVECT resmat[4]; |
515 |
register VNDX p0i, p1i, p2i, p3i; |
516 |
{ |
517 |
#define u ((ax+1)%3) |
518 |
#define v ((ax+2)%3) |
519 |
|
520 |
register int ax; |
521 |
MAT4 eqnmat; |
522 |
FVECT v1; |
523 |
register int i, j; |
524 |
|
525 |
if (!(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0)) |
526 |
return(-1); |
527 |
/* find dominant axis */ |
528 |
VCOPY(v1, vnlist[p0i[2]]); |
529 |
fvsum(v1, v1, vnlist[p1i[2]], 1.0); |
530 |
fvsum(v1, v1, vnlist[p2i[2]], 1.0); |
531 |
fvsum(v1, v1, vnlist[p3i[2]], 1.0); |
532 |
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
533 |
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
534 |
/* assign equation matrix */ |
535 |
eqnmat[0][0] = vlist[p0i[0]][u]*vlist[p0i[0]][v]; |
536 |
eqnmat[0][1] = vlist[p0i[0]][u]; |
537 |
eqnmat[0][2] = vlist[p0i[0]][v]; |
538 |
eqnmat[0][3] = 1.0; |
539 |
eqnmat[1][0] = vlist[p1i[0]][u]*vlist[p1i[0]][v]; |
540 |
eqnmat[1][1] = vlist[p1i[0]][u]; |
541 |
eqnmat[1][2] = vlist[p1i[0]][v]; |
542 |
eqnmat[1][3] = 1.0; |
543 |
eqnmat[2][0] = vlist[p2i[0]][u]*vlist[p2i[0]][v]; |
544 |
eqnmat[2][1] = vlist[p2i[0]][u]; |
545 |
eqnmat[2][2] = vlist[p2i[0]][v]; |
546 |
eqnmat[2][3] = 1.0; |
547 |
eqnmat[3][0] = vlist[p3i[0]][u]*vlist[p3i[0]][v]; |
548 |
eqnmat[3][1] = vlist[p3i[0]][u]; |
549 |
eqnmat[3][2] = vlist[p3i[0]][v]; |
550 |
eqnmat[3][3] = 1.0; |
551 |
/* invert matrix (solve system) */ |
552 |
if (!invmat4(eqnmat, eqnmat)) |
553 |
return(-1); /* no solution */ |
554 |
/* compute result matrix */ |
555 |
for (j = 0; j < 4; j++) |
556 |
for (i = 0; i < 3; i++) |
557 |
resmat[j][i] = eqnmat[j][0]*vnlist[p0i[2]][i] + |
558 |
eqnmat[j][1]*vnlist[p1i[2]][i] + |
559 |
eqnmat[j][2]*vnlist[p2i[2]][i] + |
560 |
eqnmat[j][3]*vnlist[p3i[2]][i]; |
561 |
return(ax); |
562 |
|
563 |
#undef u |
564 |
#undef v |
565 |
} |
566 |
|
567 |
|
568 |
freeverts() /* free all vertices */ |
569 |
{ |
570 |
if (nvs) { |
571 |
free((char *)vlist); |
572 |
nvs = 0; |
573 |
} |
574 |
if (nvts) { |
575 |
free((char *)vtlist); |
576 |
nvts = 0; |
577 |
} |
578 |
if (nvns) { |
579 |
free((char *)vnlist); |
580 |
nvns = 0; |
581 |
} |
582 |
} |
583 |
|
584 |
|
585 |
int |
586 |
newv(x, y, z) /* create a new vertex */ |
587 |
double x, y, z; |
588 |
{ |
589 |
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
590 |
if (nvs == 0) |
591 |
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
592 |
else |
593 |
vlist = (FVECT *)realloc((char *)vlist, |
594 |
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
595 |
if (vlist == NULL) { |
596 |
fprintf(stderr, |
597 |
"Out of memory while allocating vertex %d\n", nvs); |
598 |
exit(1); |
599 |
} |
600 |
} |
601 |
/* assign new vertex */ |
602 |
vlist[nvs][0] = x; |
603 |
vlist[nvs][1] = y; |
604 |
vlist[nvs][2] = z; |
605 |
return(++nvs); |
606 |
} |
607 |
|
608 |
|
609 |
int |
610 |
newvn(x, y, z) /* create a new vertex normal */ |
611 |
double x, y, z; |
612 |
{ |
613 |
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
614 |
if (nvns == 0) |
615 |
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
616 |
else |
617 |
vnlist = (FVECT *)realloc((char *)vnlist, |
618 |
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
619 |
if (vnlist == NULL) { |
620 |
fprintf(stderr, |
621 |
"Out of memory while allocating normal %d\n", nvns); |
622 |
exit(1); |
623 |
} |
624 |
} |
625 |
/* assign new normal */ |
626 |
vnlist[nvns][0] = x; |
627 |
vnlist[nvns][1] = y; |
628 |
vnlist[nvns][2] = z; |
629 |
if (normalize(vnlist[nvns]) == 0.0) |
630 |
return(0); |
631 |
return(++nvns); |
632 |
} |
633 |
|
634 |
|
635 |
int |
636 |
newvt(x, y) /* create a new texture vertex */ |
637 |
double x, y; |
638 |
{ |
639 |
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
640 |
if (nvts == 0) |
641 |
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
642 |
else |
643 |
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
644 |
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
645 |
if (vtlist == NULL) { |
646 |
fprintf(stderr, |
647 |
"Out of memory while allocating texture vertex %d\n", |
648 |
nvts); |
649 |
exit(1); |
650 |
} |
651 |
} |
652 |
/* assign new texture vertex */ |
653 |
vtlist[nvts][0] = x; |
654 |
vtlist[nvts][1] = y; |
655 |
return(++nvts); |
656 |
} |
657 |
|
658 |
|
659 |
syntax(fn, ln, er) /* report syntax error and exit */ |
660 |
char *fn; |
661 |
int ln; |
662 |
char *er; |
663 |
{ |
664 |
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
665 |
fn, ln, er); |
666 |
exit(1); |
667 |
} |