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

Comparing ray/src/cv/obj2rad.c (file contents):
Revision 2.12 by greg, Wed Jun 15 12:52:19 1994 UTC vs.
Revision 2.27 by greg, Tue Sep 28 21:28:23 2010 UTC

#	Line 1 | Line 1
1	–	/* Copyright (c) 1994 Regents of the University of California */
2	–
1		#ifndef lint
2	<	static char SCCSid[] = "$SunId$ LBL";
2	>	static const char       RCSid[] = "$Id$";
3		#endif
6	–
4		/*
5		* Convert a Wavefront .obj file to Radiance format.
6		*
#	Line 13 | Line 10 | static char SCCSid[] = "$SunId$ LBL";
10		* I'm not sure they work correctly.  (Taken out -- see TEXMAPS defines.)
11		*/
12
13	<	#include "standard.h"
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
20	–	#include <ctype.h>
23
22	–	#define TCALNAME        "tmesh.cal"     /* triangle 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
28	–	#define  ABS(x)         ((x)>=0 ? (x) : -(x))
29	–
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];           /* map vertex list */
35	>	RREAL   (*vtlist)[2];           /* map vertex list */
36		int     nvts;
37
38	<	typedef struct {
39	<	int     ax;             /* major axis */
41	<	FLOAT   tm[2][3];       /* transformation */
42	<	} BARYCCM;
38	>	int     ndegen = 0;             /* count of degenerate faces */
39	>	int     n0norm = 0;             /* count of zero normals */
40
41		typedef int     VNDX[3];        /* vertex index (point,map,normal) */
42
43	<	#define CHUNKSIZ        256     /* vertex allocation chunk size */
43	>	#define CHUNKSIZ        1024    /* vertex allocation chunk size */
44
45	<	#define MAXARG          64      /* maximum # arguments in a statement */
45	>	#define MAXARG          512     /* maximum # arguments in a statement */
46
47		/* qualifiers */
48		#define Q_MTL           0
#	Line 74 | Line 71 | char   *defobj = DEFOBJ;       /* default (starting) object na
71
72		int     flatten = 0;            /* discard surface normal information */
73
77	–	char    *getmtl(), *getonm();
78	–
74		char    mapname[128];           /* current picture file */
75		char    matname[64];            /* current material name */
76		char    group[16][32];          /* current group names */
#	Line 84 | Line 79 | char   *inpfile;               /* input file name */
79		int     lineno;                 /* current line number */
80		int     faceno;                 /* current face number */
81
82	+	static void getnames(FILE *fp);
83	+	static void convert(FILE *fp);
84	+	static int getstmt(char *av[MAXARG], FILE *fp);
85	+	static char * getmtl(void);
86	+	static char * getonm(void);
87	+	static int matchrule(RULEHD *rp);
88	+	static int cvtndx(VNDX vi, char *vs);
89	+	static int nonplanar(int ac, char **av);
90	+	static int putface(int ac, char **av);
91	+	static int puttri(char *v1, char *v2, char *v3);
92	+	static void freeverts(void);
93	+	static int newv(double x, double y, double z);
94	+	static int newvn(double x, double y, double z);
95	+	static int newvt(double x, double y);
96	+	static void syntax(char *er);
97
98	<	main(argc, argv)                /* read in .obj file and convert */
99	<	int     argc;
100	<	char    *argv[];
98	>
99	>	int
100	>	main(           /* read in .obj file and convert */
101	>	int     argc,
102	>	char    *argv[]
103	>	)
104		{
105		int     donames = 0;
106		int     i;
#	Line 109 | Line 122 | char   *argv[];
122		default:
123		goto userr;
124		}
125	<	if (i > argc | i < argc-1)
125	>	if ((i > argc) | (i < argc-1))
126		goto userr;
127		if (i == argc)
128		inpfile = "<stdin>";
#	Line 130 | Line 143 | char   *argv[];
143		printargs(argc, argv, stdout);
144		convert(stdin);
145		}
146	+	if (ndegen)
147	+	printf("# %d degenerate faces\n", ndegen);
148	+	if (n0norm)
149	+	printf("# %d invalid (zero) normals\n", n0norm);
150		exit(0);
151		userr:
152		fprintf(stderr, "Usage: %s [-o obj][-m mapping][-n][-f] [file.obj]\n",
#	Line 138 | Line 155 | userr:
155		}
156
157
158	<	getnames(fp)                    /* get valid qualifier names */
159	<	FILE    *fp;
158	>	void
159	>	getnames(                       /* get valid qualifier names */
160	>	FILE    *fp
161	>	)
162		{
163		char    *argv[MAXARG];
164		int     argc;
165		ID      tmpid;
166		register int    i;
167
168	<	while (argc = getstmt(argv, fp))
168	>	while ( (argc = getstmt(argv, fp)) )
169		switch (argv[0][0]) {
170		case 'f':                               /* face */
171		if (!argv[0][1])
#	Line 187 | Line 206 | FILE   *fp;
206		}
207
208
209	<	convert(fp)                     /* convert a T-mesh */
210	<	FILE    *fp;
209	>	void
210	>	convert(                        /* convert a T-mesh */
211	>	FILE    *fp
212	>	)
213		{
214		char    *argv[MAXARG];
215		int     argc;
#	Line 197 | Line 218 | FILE   *fp;
218
219		nstats = nunknown = 0;
220		/* scan until EOF */
221	<	while (argc = getstmt(argv, fp)) {
221	>	while ( (argc = getstmt(argv, fp)) ) {
222		switch (argv[0][0]) {
223		case 'v':               /* vertex */
224		switch (argv[0][1]) {
#	Line 256 | Line 277 | FILE   *fp;
277		if (!strcmp(argv[1], "off"))
278		mapname[0] = '\0';
279		else
280	<	sprintf(mapname, "%s.pic", argv[1]);
280	>	sprintf(mapname, "%s.hdr", argv[1]);
281		} else
282		goto unknown;
283		break;
#	Line 291 | Line 312 | FILE   *fp;
312
313
314		int
315	<	getstmt(av, fp)                         /* read the next statement from fp */
316	<	register char   *av[MAXARG];
317	<	FILE    *fp;
315	>	getstmt(                                /* read the next statement from fp */
316	>	register char   *av[MAXARG],
317	>	FILE    *fp
318	>	)
319		{
320	<	extern char     *fgetline();
299	<	static char     sbuf[MAXARG*10];
320	>	static char     sbuf[MAXARG*16];
321		register char   *cp;
322		register int    i;
323
#	Line 310 | Line 331 | FILE   *fp;
331		lineno++;
332		*cp++ = '\0';
333		}
334	<	if (!*cp || i >= MAXARG-1)
334	>	if (!*cp)
335		break;
336	+	if (i >= MAXARG-1) {
337	+	fprintf(stderr,
338	+	"warning: line %d: too many arguments (limit %d)\n",
339	+	lineno+1, MAXARG-1);
340	+	break;
341	+	}
342		av[i++] = cp;
343		while (*++cp && !isspace(*cp))
344		;
#	Line 325 | Line 352 | FILE   *fp;
352
353
354		char *
355	<	getmtl()                                /* figure material for this face */
355	>	getmtl(void)                            /* figure material for this face */
356		{
357		register RULEHD *rp = ourmapping;
358
#	Line 351 | Line 378 | getmtl()                               /* figure material for this face */
378
379
380		char *
381	<	getonm()                                /* invent a good name for object */
381	>	getonm(void)                            /* invent a good name for object */
382		{
383		static char     name[64];
384		register char   *cp1, *cp2;
#	Line 366 | Line 393 | getonm()                               /* invent a good name for object */
393		cp2 = group[i];
394		if (cp1 > name)
395		*cp1++ = '.';
396	<	while (*cp1 = *cp2++)
396	>	while ( (*cp1 = *cp2++) )
397		if (++cp1 >= name+sizeof(name)-2) {
398		*cp1 = '\0';
399		return(name);
#	Line 376 | Line 403 | getonm()                               /* invent a good name for object */
403		}
404
405
406	<	matchrule(rp)                           /* check for a match on this rule */
407	<	register RULEHD *rp;
406	>	int
407	>	matchrule(                              /* check for a match on this rule */
408	>	register RULEHD *rp
409	>	)
410		{
411		ID      tmpid;
412		int     gotmatch;
#	Line 427 | Line 456 | register RULEHD        *rp;
456		}
457
458
459	<	cvtndx(vi, vs)                          /* convert vertex string to index */
460	<	register VNDX   vi;
461	<	register char   *vs;
459	>	int
460	>	cvtndx(                         /* convert vertex string to index */
461	>	register VNDX   vi,
462	>	register char   *vs
463	>	)
464		{
465		/* get point */
466		vi[0] = atoi(vs);
#	Line 470 | Line 501 | register char  *vs;
501		return(0);
502		} else
503		vi[2] = -1;
504	+	/* zero normal is not normal */
505	+	if (vi[2] >= 0 && DOT(vnlist[vi[2]],vnlist[vi[2]]) <= FTINY)
506	+	vi[2] = -1;
507		return(1);
508		}
509
510
511	<	nonplanar(ac, av)                       /* are vertices non-planar? */
512	<	register int    ac;
513	<	register char   **av;
511	>	int
512	>	nonplanar(                      /* are vertices non-planar? */
513	>	register int    ac,
514	>	register char   **av
515	>	)
516		{
517		VNDX    vi;
518	<	FLOAT   *p0, *p1;
518	>	RREAL   *p0, *p1;
519		FVECT   v1, v2, nsum, newn;
520		double  d;
521		register int    i;
#	Line 525 | Line 561 | register char  **av;
561		}
562
563
564	<	putface(ac, av)                         /* put out an N-sided polygon */
565	<	int     ac;
566	<	register char   **av;
564	>	int
565	>	putface(                                /* put out an N-sided polygon */
566	>	int     ac,
567	>	register char   **av
568	>	)
569		{
570		VNDX    vi;
571		char    *cp;
#	Line 558 | Line 596 | register char  **av;
596		}
597
598
599	<	puttri(v1, v2, v3)                      /* put out a triangle */
600	<	char    *v1, *v2, *v3;
599	>	int
600	>	puttri(                 /* put out a triangle */
601	>	char *v1,
602	>	char *v2,
603	>	char *v3
604	>	)
605		{
606		char    *mod;
607		VNDX    v1i, v2i, v3i;
608		BARYCCM bvecs;
609	<	int     texOK, patOK;
609	>	RREAL   bcoor[3][3];
610	>	int     texOK = 0, patOK;
611	>	int     flatness;
612	>	register int    i;
613
614		if ((mod = getmtl()) == NULL)
615		return(-1);
#	Line 572 | Line 617 | char   *v1, *v2, *v3;
617		if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3))
618		return(0);
619		/* compute barycentric coordinates */
620	<	texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0);
620	>	if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0)
621	>	flatness = flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]],
622	>	vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]]);
623	>	else
624	>	flatness = ISFLAT;
625	>
626	>	switch (flatness) {
627	>	case DEGEN:                     /* zero area */
628	>	ndegen++;
629	>	return(-1);
630	>	case RVFLAT:                    /* reversed normals, but flat */
631	>	case ISFLAT:                    /* smoothing unnecessary */
632	>	texOK = 0;
633	>	break;
634	>	case RVBENT:                    /* reversed normals with smoothing */
635	>	case ISBENT:                    /* proper smoothing */
636	>	texOK = 1;
637	>	break;
638	>	}
639	>	if (flatten)
640	>	texOK = 0;
641		#ifdef TEXMAPS
642		patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0);
643		#else
#	Line 581 | Line 646 | char   *v1, *v2, *v3;
646		if (texOK | patOK)
647		if (comp_baryc(&bvecs, vlist[v1i[0]], vlist[v2i[0]],
648		vlist[v3i[0]]) < 0)
649	<	return(-1);
649	>	texOK = patOK = 0;
650		/* put out texture (if any) */
651		if (texOK) {
652		printf("\n%s texfunc %s\n", mod, TEXNAME);
653		mod = TEXNAME;
654		printf("4 dx dy dz %s\n", TCALNAME);
655	<	printf("0\n16 ");
656	<	put_baryc(&bvecs);
657	<	printf("\t%14.12g %14.12g %14.12g\n",
658	<	vnlist[v1i[2]][0], vnlist[v2i[2]][0],
659	<	vnlist[v3i[2]][0]);
660	<	printf("\t%14.12g %14.12g %14.12g\n",
661	<	vnlist[v1i[2]][1], vnlist[v2i[2]][1],
597	<	vnlist[v3i[2]][1]);
598	<	printf("\t%14.12g %14.12g %14.12g\n",
599	<	vnlist[v1i[2]][2], vnlist[v2i[2]][2],
600	<	vnlist[v3i[2]][2]);
655	>	printf("0\n");
656	>	for (i = 0; i < 3; i++) {
657	>	bcoor[i][0] = vnlist[v1i[2]][i];
658	>	bcoor[i][1] = vnlist[v2i[2]][i];
659	>	bcoor[i][2] = vnlist[v3i[2]][i];
660	>	}
661	>	put_baryc(&bvecs, bcoor, 3);
662		}
663		#ifdef TEXMAPS
664		/* put out pattern (if any) */
#	Line 605 | Line 666 | char   *v1, *v2, *v3;
666		printf("\n%s colorpict %s\n", mod, PATNAME);
667		mod = PATNAME;
668		printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME);
669	<	printf("0\n13 ");
670	<	put_baryc(&bvecs);
671	<	printf("\t%f %f %f\n", vtlist[v1i[1]][0],
672	<	vtlist[v2i[1]][0], vtlist[v3i[1]][0]);
673	<	printf("\t%f %f %f\n", vtlist[v1i[1]][1],
674	<	vtlist[v2i[1]][1], vtlist[v3i[1]][1]);
669	>	printf("0\n");
670	>	for (i = 0; i < 2; i++) {
671	>	bcoor[i][0] = vtlist[v1i[1]][i];
672	>	bcoor[i][1] = vtlist[v2i[1]][i];
673	>	bcoor[i][2] = vtlist[v3i[1]][i];
674	>	}
675	>	put_baryc(&bvecs, bcoor, 2);
676		}
677		#endif
678	<	/* put out triangle */
678	>	/* put out (reversed) triangle */
679		printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
680		printf("0\n0\n9\n");
681	<	pvect(vlist[v1i[0]]);
682	<	pvect(vlist[v2i[0]]);
683	<	pvect(vlist[v3i[0]]);
684	<
681	>	if (flatness == RVFLAT || flatness == RVBENT) {
682	>	pvect(vlist[v3i[0]]);
683	>	pvect(vlist[v2i[0]]);
684	>	pvect(vlist[v1i[0]]);
685	>	} else {
686	>	pvect(vlist[v1i[0]]);
687	>	pvect(vlist[v2i[0]]);
688	>	pvect(vlist[v3i[0]]);
689	>	}
690		return(1);
691		}
692
693
694	<	int
695	<	comp_baryc(bcm, v1, v2, v3)             /* compute barycentric vectors */
629	<	register BARYCCM        *bcm;
630	<	FLOAT   *v1, *v2, *v3;
694	>	void
695	>	freeverts(void)                 /* free all vertices */
696		{
632	–	FLOAT   *vt;
633	–	FVECT   va, vab, vcb;
634	–	double  d;
635	–	int     ax0, ax1;
636	–	register int    i, j;
637	–	/* compute major axis */
638	–	for (i = 0; i < 3; i++) {
639	–	vab[i] = v1[i] - v2[i];
640	–	vcb[i] = v3[i] - v2[i];
641	–	}
642	–	fcross(va, vab, vcb);
643	–	bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1;
644	–	bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2;
645	–	ax0 = (bcm->ax + 1) % 3;
646	–	ax1 = (bcm->ax + 2) % 3;
647	–	for (j = 0; j < 2; j++) {
648	–	vab[0] = v1[ax0] - v2[ax0];
649	–	vcb[0] = v3[ax0] - v2[ax0];
650	–	vab[1] = v1[ax1] - v2[ax1];
651	–	vcb[1] = v3[ax1] - v2[ax1];
652	–	d = vcb[0]*vcb[0] + vcb[1]*vcb[1];
653	–	if (d <= FTINY)
654	–	return(-1);
655	–	d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d;
656	–	va[0] = vab[0] - vcb[0]*d;
657	–	va[1] = vab[1] - vcb[1]*d;
658	–	d = va[0]*va[0] + va[1]*va[1];
659	–	if (d <= FTINY)
660	–	return(-1);
661	–	bcm->tm[j][0] = va[0] /= d;
662	–	bcm->tm[j][1] = va[1] /= d;
663	–	bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]);
664	–	/* rotate vertices */
665	–	vt = v1;
666	–	v1 = v2;
667	–	v2 = v3;
668	–	v3 = vt;
669	–	}
670	–	return(0);
671	–	}
672	–
673	–
674	–	put_baryc(bcm)                          /* put barycentric coord. vectors */
675	–	register BARYCCM        *bcm;
676	–	{
677	–	printf("\t%d\n", bcm->ax);
678	–	printf("%14.8f %14.8f %14.8f\n",
679	–	bcm->tm[0][0], bcm->tm[0][1], bcm->tm[0][2]);
680	–	printf("%14.8f %14.8f %14.8f\n",
681	–	bcm->tm[1][0], bcm->tm[1][1], bcm->tm[1][2]);
682	–	}
683	–
684	–
685	–	freeverts()                     /* free all vertices */
686	–	{
697		if (nvs) {
698	<	free((char *)vlist);
698	>	free((void *)vlist);
699		nvs = 0;
700		}
701		if (nvts) {
702	<	free((char *)vtlist);
702	>	free((void *)vtlist);
703		nvts = 0;
704		}
705		if (nvns) {
706	<	free((char *)vnlist);
706	>	free((void *)vnlist);
707		nvns = 0;
708		}
709		}
710
711
712		int
713	<	newv(x, y, z)                   /* create a new vertex */
714	<	double  x, y, z;
713	>	newv(                   /* create a new vertex */
714	>	double  x,
715	>	double  y,
716	>	double  z
717	>	)
718		{
719		if (!(nvs%CHUNKSIZ)) {          /* allocate next block */
720		if (nvs == 0)
721		vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
722		else
723	<	vlist = (FVECT *)realloc((char *)vlist,
723	>	vlist = (FVECT *)realloc((void *)vlist,
724		(nvs+CHUNKSIZ)*sizeof(FVECT));
725		if (vlist == NULL) {
726		fprintf(stderr,
#	Line 724 | Line 737 | double x, y, z;
737
738
739		int
740	<	newvn(x, y, z)                  /* create a new vertex normal */
741	<	double  x, y, z;
740	>	newvn(                  /* create a new vertex normal */
741	>	double  x,
742	>	double  y,
743	>	double  z
744	>	)
745		{
746		if (!(nvns%CHUNKSIZ)) {         /* allocate next block */
747		if (nvns == 0)
748		vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
749		else
750	<	vnlist = (FVECT *)realloc((char *)vnlist,
750	>	vnlist = (FVECT *)realloc((void *)vnlist,
751		(nvns+CHUNKSIZ)*sizeof(FVECT));
752		if (vnlist == NULL) {
753		fprintf(stderr,
#	Line 743 | Line 759 | double x, y, z;
759		vnlist[nvns][0] = x;
760		vnlist[nvns][1] = y;
761		vnlist[nvns][2] = z;
762	<	if (normalize(vnlist[nvns]) == 0.0)
747	<	return(0);
762	>	n0norm += (normalize(vnlist[nvns]) == 0.0);
763		return(++nvns);
764		}
765
766
767		int
768	<	newvt(x, y)                     /* create a new texture map vertex */
769	<	double  x, y;
768	>	newvt(                  /* create a new texture map vertex */
769	>	double  x,
770	>	double  y
771	>	)
772		{
773		if (!(nvts%CHUNKSIZ)) {         /* allocate next block */
774		if (nvts == 0)
775	<	vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT));
775	>	vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL));
776		else
777	<	vtlist = (FLOAT (*)[2])realloc((char *)vtlist,
778	<	(nvts+CHUNKSIZ)*2*sizeof(FLOAT));
777	>	vtlist = (RREAL (*)[2])realloc((void *)vtlist,
778	>	(nvts+CHUNKSIZ)*2*sizeof(RREAL));
779		if (vtlist == NULL) {
780		fprintf(stderr,
781		"Out of memory while allocating texture vertex %d\n",
#	Line 773 | Line 790 | double x, y;
790		}
791
792
793	<	syntax(er)                      /* report syntax error and exit */
794	<	char    *er;
793	>	void
794	>	syntax(                 /* report syntax error and exit */
795	>	char    *er
796	>	)
797		{
798		fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n",
799		inpfile, lineno, er);

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