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root/Development/ray/src/cv/obj2rad.c

Comparing ray/src/cv/obj2rad.c (file contents):
Revision 2.4 by greg, Wed Apr 13 15:16:49 1994 UTC vs.
Revision 2.10 by greg, Wed Jun 15 12:29:55 1994 UTC

#	Line 7 | Line 7 | static char SCCSid[] = "$SunId$ LBL";
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.
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.
13	>	* I'm not sure they work correctly.  (Taken out -- see TEXMAPS defines.)
14		*/
15
16		#include "standard.h"
#	Line 37 | Line 37 | int    nvns;
37		FLOAT   (*vtlist)[2];           /* map vertex list */
38		int     nvts;
39
40	<	typedef FLOAT   BARYCCM[3][4];  /* barycentric coordinate system */
40	>	typedef struct {
41	>	int     ax;             /* major axis */
42	>	FLOAT   tm[2][3];       /* transformation */
43	>	} BARYCCM;
44
45		typedef int     VNDX[3];        /* vertex index (point,map,normal) */
46
#	Line 69 | Line 72 | RULEHD *ourmapping = NULL;
72
73		char    *defmat = DEFMAT;       /* default (starting) material name */
74		char    *defobj = DEFOBJ;       /* default (starting) object name */
72	–	int     donames = 0;            /* only get qualifier names */
75
76	+	int     flatten = 0;            /* discard surface normal information */
77	+
78		char    *getmtl(), *getonm();
79
80		char    mapname[128];           /* current picture file */
81		char    matname[64];            /* current material name */
82		char    group[16][32];          /* current group names */
83		char    objname[128];           /* current object name */
84	+	char    *inpfile;               /* input file name */
85		int     lineno;                 /* current line number */
86	<	int     faceno;                 /* number of faces read */
86	>	int     faceno;                 /* current face number */
87
88
89		main(argc, argv)                /* read in .obj file and convert */
90		int     argc;
91		char    *argv[];
92		{
93	<	char    *fname;
93	>	int     donames = 0;
94		int     i;
95
96		for (i = 1; i < argc && argv[i][0] == '-'; i++)
#	Line 99 | Line 104 | char   *argv[];
104		case 'm':               /* use custom mapfile */
105		ourmapping = getmapping(argv[++i], &qlist);
106		break;
107	+	case 'f':               /* flatten surfaces */
108	+	flatten++;
109	+	break;
110		default:
111		goto userr;
112		}
113		if (i > argc | i < argc-1)
114		goto userr;
115		if (i == argc)
116	<	fname = "<stdin>";
117	<	else if (freopen(fname=argv[i], "r", stdin) == NULL) {
118	<	fprintf(stderr, "%s: cannot open\n", fname);
116	>	inpfile = "<stdin>";
117	>	else if (freopen(inpfile=argv[i], "r", stdin) == NULL) {
118	>	fprintf(stderr, "%s: cannot open\n", inpfile);
119		exit(1);
120		}
121		if (donames) {                          /* scan for ids */
122		getnames(stdin);
123	<	printf("filename \"%s\"\n", fname);
123	>	printf("filename \"%s\"\n", inpfile);
124		printf("filetype \"Wavefront\"\n");
125		write_quals(&qlist, qual, stdout);
126		printf("qualifier %s begin\n", qlist.qual[Q_FAC]);
#	Line 121 | Line 129 | char   *argv[];
129		} else {                                /* translate file */
130		printf("# ");
131		printargs(argc, argv, stdout);
132	<	convert(fname, stdin);
132	>	convert(stdin);
133		}
134		exit(0);
135		userr:
136	<	fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n] [file.obj]\n",
136	>	fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n][-f] [file.obj]\n",
137		argv[0]);
138		exit(1);
139		}
#	Line 180 | Line 188 | FILE   *fp;
188		}
189
190
191	<	convert(fname, fp)              /* convert a T-mesh */
184	<	char    *fname;
191	>	convert(fp)                     /* convert a T-mesh */
192		FILE    *fp;
193		{
194		char    *argv[MAXARG];
195		int     argc;
196		int     nstats, nunknown;
197		register int    i;
198	<	/* start fresh */
192	<	freeverts();
193	<	mapname[0] = '\0';
194	<	strcpy(matname, defmat);
195	<	strcpy(objname, defobj);
196	<	lineno = 0;
198	>
199		nstats = nunknown = 0;
200		/* scan until EOF */
201		while (argc = getstmt(argv, fp)) {
#	Line 202 | Line 204 | FILE   *fp;
204		switch (argv[0][1]) {
205		case '\0':                      /* point */
206		if (badarg(argc-1,argv+1,"fff"))
207	<	syntax(fname, lineno, "Bad vertex");
207	>	syntax("Bad vertex");
208		newv(atof(argv[1]), atof(argv[2]),
209		atof(argv[3]));
210		break;
#	Line 210 | Line 212 | FILE   *fp;
212		if (argv[0][2])
213		goto unknown;
214		if (badarg(argc-1,argv+1,"fff"))
215	<	syntax(fname, lineno, "Bad normal");
215	>	syntax("Bad normal");
216		if (!newvn(atof(argv[1]), atof(argv[2]),
217		atof(argv[3])))
218	<	syntax(fname, lineno, "Zero normal");
218	>	syntax("Zero normal");
219		break;
220		case 't':                       /* texture map */
221		if (argv[0][2])
#	Line 232 | Line 234 | FILE   *fp;
234		faceno++;
235		switch (argc-1) {
236		case 0: case 1: case 2:
237	<	syntax(fname, lineno, "Too few vertices");
237	>	syntax("Too few vertices");
238		break;
239		case 3:
240		if (!puttri(argv[1], argv[2], argv[3]))
241	<	syntax(fname, lineno, "Bad triangle");
241	>	syntax("Bad triangle");
242		break;
243		case 4:
244		if (!putquad(argv[1], argv[2],
245		argv[3], argv[4]))
246	<	syntax(fname, lineno, "Bad quad");
246	>	syntax("Bad quad");
247		break;
248		default:
249		if (!putface(argc-1, argv+1))
250	<	syntax(fname, lineno, "Bad face");
250	>	syntax("Bad face");
251		break;
252		}
253		break;
#	Line 260 | Line 262 | FILE   *fp;
262		if (!strcmp(argv[1], "off"))
263		mapname[0] = '\0';
264		else
265	<	strcpy(mapname, argv[1]);
265	>	sprintf(mapname, "%s.pic", argv[1]);
266		} else
267		goto unknown;
268		break;
#	Line 279 | Line 281 | FILE   *fp;
281		group[i-1][0] = '\0';
282		break;
283		case '#':               /* comment */
284	+	printargs(argc, argv, stdout);
285		break;
286		default:;               /* something we don't deal with */
287		unknown:
#	Line 287 | Line 290 | FILE   *fp;
290		}
291		nstats++;
292		}
293	<	printf("\n# Done processing file: %s\n", fname);
293	>	printf("\n# Done processing file: %s\n", inpfile);
294		printf("# %d lines, %d statements, %d unrecognized\n",
295		lineno, nstats, nunknown);
296		}
#	Line 332 | Line 335 | getmtl()                               /* figure material for this face */
335		{
336		register RULEHD *rp = ourmapping;
337
338	<	if (rp == NULL)                 /* no rule set */
339	<	return(matname);
338	>	if (rp == NULL) {               /* no rule set */
339	>	if (matname[0])
340	>	return(matname);
341	>	if (group[0][0])
342	>	return(group[0]);
343	>	return(defmat);
344	>	}
345		/* check for match */
346		do {
347		if (matchrule(rp)) {
#	Line 354 | Line 362 | getonm()                               /* invent a good name for object */
362		static char     name[64];
363		register char   *cp1, *cp2;
364		register int    i;
365	<
366	<	if (!group[0][0] || strcmp(objname, DEFOBJ))
367	<	return(objname);        /* good enough for us */
368	<
365	>	/* check for preset */
366	>	if (objname[0])
367	>	return(objname);
368	>	if (!group[0][0])
369	>	return(defobj);
370		cp1 = name;                     /* else make name out of groups */
371		for (i = 0; group[i][0]; i++) {
372		cp2 = group[i];
#	Line 381 | Line 390 | register RULEHD        *rp;
390		register int    i;
391
392		if (rp->qflg & FL(Q_MTL)) {
393	+	if (!matname[0])
394	+	return(0);
395		tmpid.number = 0;
396		tmpid.name = matname;
397		if (!matchid(&tmpid, &idm(rp)[Q_MTL]))
398		return(0);
399		}
400		if (rp->qflg & FL(Q_MAP)) {
401	+	if (!mapname[0])
402	+	return(0);
403		tmpid.number = 0;
404		tmpid.name = mapname;
405		if (!matchid(&tmpid, &idm(rp)[Q_MAP]))
#	Line 403 | Line 416 | register RULEHD        *rp;
416		return(0);
417		}
418		if (rp->qflg & FL(Q_OBJ)) {
419	+	if (!objname[0])
420	+	return(0);
421		tmpid.number = 0;
422		tmpid.name = objname;
423		if (!matchid(&tmpid, &idm(rp)[Q_OBJ]))
#	Line 428 | Line 443 | register char  *vs;
443		if (vi[0]-- > nvs)
444		return(0);
445		} else if (vi[0] < 0) {
446	<	vi[0] = nvs + vi[0];
446	>	vi[0] += nvs;
447		if (vi[0] < 0)
448		return(0);
449		} else
#	Line 442 | Line 457 | register char  *vs;
457		if (vi[1]-- > nvts)
458		return(0);
459		} else if (vi[1] < 0) {
460	<	vi[1] = nvts + vi[1];
460	>	vi[1] += nvts;
461		if (vi[1] < 0)
462		return(0);
463		} else
#	Line 456 | Line 471 | register char  *vs;
471		if (vi[2]-- > nvns)
472		return(0);
473		} else if (vi[2] < 0) {
474	<	vi[2] = nvns + vi[2];
474	>	vi[2] += nvns;
475		if (vi[2] < 0)
476		return(0);
477		} else
#	Line 465 | Line 480 | register char  *vs;
480		}
481
482
483	<	putface(ac, av)                         /* put out an N-sided polygon */
483	>	nonplanar(ac, av)                       /* are vertices non-planar? */
484		register int    ac;
485		register char   **av;
486		{
487		VNDX    vi;
488	<	char    *mod;
488	>	FLOAT   *p0, *p1;
489	>	FVECT   v1, v2, nsum, newn;
490	>	double  d;
491	>	register int    i;
492
493	<	if ((mod = getmtl()) == NULL)
493	>	if (!cvtndx(vi, av[0]))
494	>	return(0);
495	>	if (vi[2] >= 0)
496	>	return(1);              /* has interpolated normals */
497	>	if (ac < 4)
498	>	return(0);              /* it's a triangle! */
499	>	/* set up */
500	>	p0 = vlist[vi[0]];
501	>	if (!cvtndx(vi, av[1]))
502	>	return(0);              /* error gets caught later */
503	>	nsum[0] = nsum[1] = nsum[2] = 0.;
504	>	p1 = vlist[vi[0]];
505	>	fvsum(v2, p1, p0, -1.0);
506	>	for (i = 2; i < ac; i++) {
507	>	VCOPY(v1, v2);
508	>	if (!cvtndx(vi, av[i]))
509	>	return(0);
510	>	p1 = vlist[vi[0]];
511	>	fvsum(v2, p1, p0, -1.0);
512	>	fcross(newn, v1, v2);
513	>	if (normalize(newn) == 0.0) {
514	>	if (i < 3)
515	>	return(1);      /* can't deal with this */
516	>	fvsum(nsum, nsum, nsum, 1./(i-2));
517	>	continue;
518	>	}
519	>	d = fdot(newn,nsum);
520	>	if (d >= 0) {
521	>	if (d < (1.0-FTINY)*(i-2))
522	>	return(1);
523	>	fvsum(nsum, nsum, newn, 1.0);
524	>	} else {
525	>	if (d > -(1.0-FTINY)*(i-2))
526	>	return(1);
527	>	fvsum(nsum, nsum, newn, -1.0);
528	>	}
529	>	}
530	>	return(0);
531	>	}
532	>
533	>
534	>	putface(ac, av)                         /* put out an N-sided polygon */
535	>	int     ac;
536	>	register char   **av;
537	>	{
538	>	VNDX    vi;
539	>	char    *cp;
540	>	register int    i;
541	>
542	>	if (nonplanar(ac, av)) {        /* break into quads and triangles */
543	>	while (ac > 3) {
544	>	if (!putquad(av[0], av[1], av[2], av[3]))
545	>	return(0);
546	>	ac -= 2;        /* remove two vertices & rotate */
547	>	cp = av[0];
548	>	for (i = 0; i < ac-1; i++)
549	>	av[i] = av[i+3];
550	>	av[i] = cp;
551	>	}
552	>	if (ac == 3 && !puttri(av[0], av[1], av[2]))
553	>	return(0);
554	>	return(1);
555	>	}
556	>	if ((cp = getmtl()) == NULL)
557		return(-1);
558	<	printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
558	>	printf("\n%s polygon %s.%d\n", cp, getonm(), faceno);
559		printf("0\n0\n%d\n", 3*ac);
560	<	while (ac--) {
561	<	if (!cvtndx(vi, *av++))
560	>	for (i = 0; i < ac; i++) {
561	>	if (!cvtndx(vi, av[i]))
562		return(0);
563		pvect(vlist[vi[0]]);
564		}
#	Line 499 | Line 580 | char   *v1, *v2, *v3;
580		if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3))
581		return(0);
582		/* compute barycentric coordinates */
583	<	texOK = (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0);
583	>	texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0);
584	>	#ifdef TEXMAPS
585		patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0);
586	+	#else
587	+	patOK = 0;
588	+	#endif
589		if (texOK | patOK)
590	<	if (comp_baryc(bvecs, vlist[v1i[0]], vlist[v2i[0]],
590	>	if (comp_baryc(&bvecs, vlist[v1i[0]], vlist[v2i[0]],
591		vlist[v3i[0]]) < 0)
592		return(-1);
593		/* put out texture (if any) */
#	Line 510 | Line 595 | char   *v1, *v2, *v3;
595		printf("\n%s texfunc %s\n", mod, TEXNAME);
596		mod = TEXNAME;
597		printf("4 dx dy dz %s\n", TCALNAME);
598	<	printf("0\n21\n");
599	<	put_baryc(bvecs);
598	>	printf("0\n16 ");
599	>	put_baryc(&bvecs);
600		printf("\t%14.12g %14.12g %14.12g\n",
601		vnlist[v1i[2]][0], vnlist[v2i[2]][0],
602		vnlist[v3i[2]][0]);
#	Line 522 | Line 607 | char   *v1, *v2, *v3;
607		vnlist[v1i[2]][2], vnlist[v2i[2]][2],
608		vnlist[v3i[2]][2]);
609		}
610	+	#ifdef TEXMAPS
611		/* put out pattern (if any) */
612		if (patOK) {
613		printf("\n%s colorpict %s\n", mod, PATNAME);
614		mod = PATNAME;
615		printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME);
616	<	printf("0\n18\n");
617	<	put_baryc(bvecs);
616	>	printf("0\n13 ");
617	>	put_baryc(&bvecs);
618		printf("\t%f %f %f\n", vtlist[v1i[1]][0],
619		vtlist[v2i[1]][0], vtlist[v3i[1]][0]);
620		printf("\t%f %f %f\n", vtlist[v1i[1]][1],
621		vtlist[v2i[1]][1], vtlist[v3i[1]][1]);
622		}
623	+	#endif
624		/* put out triangle */
625		printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
626		printf("0\n0\n9\n");
#	Line 547 | Line 634 | char   *v1, *v2, *v3;
634
635		int
636		comp_baryc(bcm, v1, v2, v3)             /* compute barycentric vectors */
637	<	register BARYCCM        bcm;
637	>	register BARYCCM        *bcm;
638		FLOAT   *v1, *v2, *v3;
639		{
640		FLOAT   *vt;
641		FVECT   va, vab, vcb;
642		double  d;
643	+	int     ax0, ax1;
644		register int    i, j;
645	<
646	<	for (j = 0; j < 3; j++) {
647	<	for (i = 0; i < 3; i++) {
648	<	vab[i] = v1[i] - v2[i];
649	<	vcb[i] = v3[i] - v2[i];
650	<	}
651	<	d = DOT(vcb,vcb);
645	>	/* compute major axis */
646	>	for (i = 0; i < 3; i++) {
647	>	vab[i] = v1[i] - v2[i];
648	>	vcb[i] = v3[i] - v2[i];
649	>	}
650	>	fcross(va, vab, vcb);
651	>	bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1;
652	>	bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2;
653	>	ax0 = (bcm->ax + 1) % 3;
654	>	ax1 = (bcm->ax + 2) % 3;
655	>	for (j = 0; j < 2; j++) {
656	>	vab[0] = v1[ax0] - v2[ax0];
657	>	vcb[0] = v3[ax0] - v2[ax0];
658	>	vab[1] = v1[ax1] - v2[ax1];
659	>	vcb[1] = v3[ax1] - v2[ax1];
660	>	d = vcb[0]*vcb[0] + vcb[1]*vcb[1];
661		if (d <= FTINY)
662		return(-1);
663	<	d = DOT(vcb,vab)/d;
664	<	for (i = 0; i < 3; i++)
665	<	va[i] = vab[i] - vcb[i]*d;
666	<	d = DOT(va,va);
663	>	d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d;
664	>	va[0] = vab[0] - vcb[0]*d;
665	>	va[1] = vab[1] - vcb[1]*d;
666	>	d = va[0]*va[0] + va[1]*va[1];
667		if (d <= FTINY)
668		return(-1);
669	<	for (i = 0; i < 3; i++) {
670	<	va[i] /= d;
671	<	bcm[j][i] = va[i];
575	<	}
576	<	bcm[j][3] = -DOT(v2,va);
669	>	bcm->tm[j][0] = va[0] /= d;
670	>	bcm->tm[j][1] = va[1] /= d;
671	>	bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]);
672		/* rotate vertices */
673		vt = v1;
674		v1 = v2;
#	Line 585 | Line 680 | FLOAT  *v1, *v2, *v3;
680
681
682		put_baryc(bcm)                          /* put barycentric coord. vectors */
683	<	register BARYCCM        bcm;
683	>	register BARYCCM        *bcm;
684		{
685	<	register int    i;
686	<
687	<	for (i = 0; i < 3; i++)
688	<	printf("%14.8f %14.8f %14.8f %14.8f\n",
689	<	bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]);
685	>	printf("\t%d\n", bcm->ax);
686	>	printf("%14.8f %14.8f %14.8f\n",
687	>	bcm->tm[0][0], bcm->tm[0][1], bcm->tm[0][2]);
688	>	printf("%14.8f %14.8f %14.8f\n",
689	>	bcm->tm[1][0], bcm->tm[1][1], bcm->tm[1][2]);
690		}
691
692
#	Line 605 | Line 700 | char  *p0, *p1, *p3, *p2;              /* names correspond to bina
700		FVECT  v1, v2, vc1, vc2;
701		int  ok1, ok2;
702
703	+	#ifdef TEXMAPS
704	+	/* also should output texture index coordinates,
705	+	* which will require new .cal file
706	+	*/
707	+	#endif
708		if ((mod = getmtl()) == NULL)
709		return(-1);
710		name = getonm();
#	Line 627 | Line 727 | char  *p0, *p1, *p3, *p2;              /* names correspond to bina
727		axis = norminterp(norm, p0i, p1i, p2i, p3i);
728
729		/* put out quadrilateral? */
730	<	if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) {
730	>	if (ok1 & ok2 && fabs(fdot(vc1,vc2)) >= 1.0-FTINY) {
731		printf("\n%s ", mod);
732		if (axis != -1) {
733		printf("texfunc %s\n", TEXNAME);
#	Line 705 | Line 805 | register VNDX  p0i, p1i, p2i, p3i;
805		FVECT  v1;
806		register int  i, j;
807
808	<	if (!(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0))
808	>	#ifdef TEXMAPS
809	>	/* also check for texture indices */
810	>	#endif
811	>	if (flatten || !(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0))
812		return(-1);
813		/* find dominant axis */
814		VCOPY(v1, vnlist[p0i[2]]);
#	Line 741 | Line 844 | register VNDX  p0i, p1i, p2i, p3i;
844		eqnmat[j][1]*vnlist[p1i[2]][i] +
845		eqnmat[j][2]*vnlist[p2i[2]][i] +
846		eqnmat[j][3]*vnlist[p3i[2]][i];
847	+	#ifdef TEXMAPS
848	+	/* compute result matrix for texture indices */
849	+	#endif
850		return(ax);
851
852		#undef u
#	Line 839 | Line 945 | double x, y;
945		}
946
947
948	<	syntax(fn, ln, er)                      /* report syntax error and exit */
843	<	char    *fn;
844	<	int     ln;
948	>	syntax(er)                      /* report syntax error and exit */
949		char    *er;
950		{
951		fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n",
952	<	fn, ln, er);
952	>	inpfile, lineno, er);
953		exit(1);
954		}

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