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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 2.23 by greg, Fri Apr 23 16:20:56 2004 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
39	–	typedef struct {
40	–	int     ax;             /* major axis */
41	–	FLOAT   tm[2][3];       /* transformation */
42	–	} BARYCCM;
43	–
38		typedef int     VNDX[3];        /* vertex index (point,map,normal) */
39
40	<	#define CHUNKSIZ        256     /* vertex allocation chunk size */
40	>	#define CHUNKSIZ        1024    /* vertex allocation chunk size */
41
42	<	#define MAXARG          64      /* maximum # arguments in a statement */
42	>	#define MAXARG          512     /* maximum # arguments in a statement */
43
44		/* qualifiers */
45		#define Q_MTL           0
#	Line 74 | Line 68 | char   *defobj = DEFOBJ;       /* default (starting) object na
68
69		int     flatten = 0;            /* discard surface normal information */
70
77	–	char    *getmtl(), *getonm();
78	–
71		char    mapname[128];           /* current picture file */
72		char    matname[64];            /* current material name */
73		char    group[16][32];          /* current group names */
#	Line 84 | Line 76 | char   *inpfile;               /* input file name */
76		int     lineno;                 /* current line number */
77		int     faceno;                 /* current face number */
78
79	+	static void getnames(FILE *fp);
80	+	static void convert(FILE *fp);
81	+	static int getstmt(char *av[MAXARG], FILE *fp);
82	+	static char * getmtl(void);
83	+	static char * getonm(void);
84	+	static int matchrule(RULEHD *rp);
85	+	static int cvtndx(VNDX vi, char *vs);
86	+	static int nonplanar(int ac, char **av);
87	+	static int putface(int ac, char **av);
88	+	static int puttri(char *v1, char *v2, char *v3);
89	+	static void freeverts(void);
90	+	static int newv(double x, double y, double z);
91	+	static int newvn(double x, double y, double z);
92	+	static int newvt(double x, double y);
93	+	static void syntax(char *er);
94
95	<	main(argc, argv)                /* read in .obj file and convert */
96	<	int     argc;
97	<	char    *argv[];
95	>
96	>	int
97	>	main(           /* read in .obj file and convert */
98	>	int     argc,
99	>	char    *argv[]
100	>	)
101		{
102		int     donames = 0;
103		int     i;
#	Line 109 | Line 119 | char   *argv[];
119		default:
120		goto userr;
121		}
122	<	if (i > argc | i < argc-1)
122	>	if ((i > argc) | (i < argc-1))
123		goto userr;
124		if (i == argc)
125		inpfile = "<stdin>";
#	Line 138 | Line 148 | userr:
148		}
149
150
151	<	getnames(fp)                    /* get valid qualifier names */
152	<	FILE    *fp;
151	>	void
152	>	getnames(                       /* get valid qualifier names */
153	>	FILE    *fp
154	>	)
155		{
156		char    *argv[MAXARG];
157		int     argc;
158		ID      tmpid;
159		register int    i;
160
161	<	while (argc = getstmt(argv, fp))
161	>	while ( (argc = getstmt(argv, fp)) )
162		switch (argv[0][0]) {
163		case 'f':                               /* face */
164		if (!argv[0][1])
#	Line 187 | Line 199 | FILE   *fp;
199		}
200
201
202	<	convert(fp)                     /* convert a T-mesh */
203	<	FILE    *fp;
202	>	void
203	>	convert(                        /* convert a T-mesh */
204	>	FILE    *fp
205	>	)
206		{
207		char    *argv[MAXARG];
208		int     argc;
#	Line 197 | Line 211 | FILE   *fp;
211
212		nstats = nunknown = 0;
213		/* scan until EOF */
214	<	while (argc = getstmt(argv, fp)) {
214	>	while ( (argc = getstmt(argv, fp)) ) {
215		switch (argv[0][0]) {
216		case 'v':               /* vertex */
217		switch (argv[0][1]) {
#	Line 291 | Line 305 | FILE   *fp;
305
306
307		int
308	<	getstmt(av, fp)                         /* read the next statement from fp */
309	<	register char   *av[MAXARG];
310	<	FILE    *fp;
308	>	getstmt(                                /* read the next statement from fp */
309	>	register char   *av[MAXARG],
310	>	FILE    *fp
311	>	)
312		{
313	<	extern char     *fgetline();
299	<	static char     sbuf[MAXARG*10];
313	>	static char     sbuf[MAXARG*16];
314		register char   *cp;
315		register int    i;
316
#	Line 310 | Line 324 | FILE   *fp;
324		lineno++;
325		*cp++ = '\0';
326		}
327	<	if (!*cp || i >= MAXARG-1)
327	>	if (!*cp)
328		break;
329	+	if (i >= MAXARG-1) {
330	+	fprintf(stderr,
331	+	"warning: line %d: too many arguments (limit %d)\n",
332	+	lineno+1, MAXARG-1);
333	+	break;
334	+	}
335		av[i++] = cp;
336		while (*++cp && !isspace(*cp))
337		;
#	Line 325 | Line 345 | FILE   *fp;
345
346
347		char *
348	<	getmtl()                                /* figure material for this face */
348	>	getmtl(void)                            /* figure material for this face */
349		{
350		register RULEHD *rp = ourmapping;
351
#	Line 351 | Line 371 | getmtl()                               /* figure material for this face */
371
372
373		char *
374	<	getonm()                                /* invent a good name for object */
374	>	getonm(void)                            /* invent a good name for object */
375		{
376		static char     name[64];
377		register char   *cp1, *cp2;
#	Line 366 | Line 386 | getonm()                               /* invent a good name for object */
386		cp2 = group[i];
387		if (cp1 > name)
388		*cp1++ = '.';
389	<	while (*cp1 = *cp2++)
389	>	while ( (*cp1 = *cp2++) )
390		if (++cp1 >= name+sizeof(name)-2) {
391		*cp1 = '\0';
392		return(name);
#	Line 376 | Line 396 | getonm()                               /* invent a good name for object */
396		}
397
398
399	<	matchrule(rp)                           /* check for a match on this rule */
400	<	register RULEHD *rp;
399	>	int
400	>	matchrule(                              /* check for a match on this rule */
401	>	register RULEHD *rp
402	>	)
403		{
404		ID      tmpid;
405		int     gotmatch;
#	Line 427 | Line 449 | register RULEHD        *rp;
449		}
450
451
452	<	cvtndx(vi, vs)                          /* convert vertex string to index */
453	<	register VNDX   vi;
454	<	register char   *vs;
452	>	int
453	>	cvtndx(                         /* convert vertex string to index */
454	>	register VNDX   vi,
455	>	register char   *vs
456	>	)
457		{
458		/* get point */
459		vi[0] = atoi(vs);
#	Line 474 | Line 498 | register char  *vs;
498		}
499
500
501	<	nonplanar(ac, av)                       /* are vertices non-planar? */
502	<	register int    ac;
503	<	register char   **av;
501	>	int
502	>	nonplanar(                      /* are vertices non-planar? */
503	>	register int    ac,
504	>	register char   **av
505	>	)
506		{
507		VNDX    vi;
508	<	FLOAT   *p0, *p1;
508	>	RREAL   *p0, *p1;
509		FVECT   v1, v2, nsum, newn;
510		double  d;
511		register int    i;
#	Line 525 | Line 551 | register char  **av;
551		}
552
553
554	<	putface(ac, av)                         /* put out an N-sided polygon */
555	<	int     ac;
556	<	register char   **av;
554	>	int
555	>	putface(                                /* put out an N-sided polygon */
556	>	int     ac,
557	>	register char   **av
558	>	)
559		{
560		VNDX    vi;
561		char    *cp;
#	Line 558 | Line 586 | register char  **av;
586		}
587
588
589	<	puttri(v1, v2, v3)                      /* put out a triangle */
590	<	char    *v1, *v2, *v3;
589	>	int
590	>	puttri(                 /* put out a triangle */
591	>	char *v1,
592	>	char *v2,
593	>	char *v3
594	>	)
595		{
596		char    *mod;
597		VNDX    v1i, v2i, v3i;
598		BARYCCM bvecs;
599	<	int     texOK, patOK;
599	>	RREAL   bcoor[3][3];
600	>	int     texOK = 0, patOK;
601	>	int     flatness;
602	>	register int    i;
603
604		if ((mod = getmtl()) == NULL)
605		return(-1);
#	Line 572 | Line 607 | char   *v1, *v2, *v3;
607		if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3))
608		return(0);
609		/* compute barycentric coordinates */
610	<	texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0);
610	>	if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0)
611	>	flatness = flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]],
612	>	vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]]);
613	>	else
614	>	flatness = ISFLAT;
615	>
616	>	switch (flatness) {
617	>	case DEGEN:                     /* zero area */
618	>	return(-1);
619	>	case RVFLAT:                    /* reversed normals, but flat */
620	>	case ISFLAT:                    /* smoothing unnecessary */
621	>	texOK = 0;
622	>	break;
623	>	case RVBENT:                    /* reversed normals with smoothing */
624	>	case ISBENT:                    /* proper smoothing */
625	>	texOK = 1;
626	>	break;
627	>	}
628	>	if (flatten)
629	>	texOK = 0;
630		#ifdef TEXMAPS
631		patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0);
632		#else
#	Line 587 | Line 641 | char   *v1, *v2, *v3;
641		printf("\n%s texfunc %s\n", mod, TEXNAME);
642		mod = TEXNAME;
643		printf("4 dx dy dz %s\n", TCALNAME);
644	<	printf("0\n16 ");
645	<	put_baryc(&bvecs);
646	<	printf("\t%14.12g %14.12g %14.12g\n",
647	<	vnlist[v1i[2]][0], vnlist[v2i[2]][0],
648	<	vnlist[v3i[2]][0]);
649	<	printf("\t%14.12g %14.12g %14.12g\n",
650	<	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]);
644	>	printf("0\n");
645	>	for (i = 0; i < 3; i++) {
646	>	bcoor[i][0] = vnlist[v1i[2]][i];
647	>	bcoor[i][1] = vnlist[v2i[2]][i];
648	>	bcoor[i][2] = vnlist[v3i[2]][i];
649	>	}
650	>	put_baryc(&bvecs, bcoor, 3);
651		}
652		#ifdef TEXMAPS
653		/* put out pattern (if any) */
#	Line 605 | Line 655 | char   *v1, *v2, *v3;
655		printf("\n%s colorpict %s\n", mod, PATNAME);
656		mod = PATNAME;
657		printf("7 noneg noneg noneg %s %s u v\n", mapname, TCALNAME);
658	<	printf("0\n13 ");
659	<	put_baryc(&bvecs);
660	<	printf("\t%f %f %f\n", vtlist[v1i[1]][0],
661	<	vtlist[v2i[1]][0], vtlist[v3i[1]][0]);
662	<	printf("\t%f %f %f\n", vtlist[v1i[1]][1],
663	<	vtlist[v2i[1]][1], vtlist[v3i[1]][1]);
658	>	printf("0\n");
659	>	for (i = 0; i < 2; i++) {
660	>	bcoor[i][0] = vtlist[v1i[1]][i];
661	>	bcoor[i][1] = vtlist[v2i[1]][i];
662	>	bcoor[i][2] = vtlist[v3i[1]][i];
663	>	}
664	>	put_baryc(&bvecs, bcoor, 2);
665		}
666		#endif
667	<	/* put out triangle */
667	>	/* put out (reversed) triangle */
668		printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
669		printf("0\n0\n9\n");
670	<	pvect(vlist[v1i[0]]);
671	<	pvect(vlist[v2i[0]]);
672	<	pvect(vlist[v3i[0]]);
673	<
670	>	if (flatness == RVFLAT || flatness == RVBENT) {
671	>	pvect(vlist[v3i[0]]);
672	>	pvect(vlist[v2i[0]]);
673	>	pvect(vlist[v1i[0]]);
674	>	} else {
675	>	pvect(vlist[v1i[0]]);
676	>	pvect(vlist[v2i[0]]);
677	>	pvect(vlist[v3i[0]]);
678	>	}
679		return(1);
680		}
681
682
683	<	int
684	<	comp_baryc(bcm, v1, v2, v3)             /* compute barycentric vectors */
629	<	register BARYCCM        *bcm;
630	<	FLOAT   *v1, *v2, *v3;
683	>	void
684	>	freeverts(void)                 /* free all vertices */
685		{
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	–	{
686		if (nvs) {
687	<	free((char *)vlist);
687	>	free((void *)vlist);
688		nvs = 0;
689		}
690		if (nvts) {
691	<	free((char *)vtlist);
691	>	free((void *)vtlist);
692		nvts = 0;
693		}
694		if (nvns) {
695	<	free((char *)vnlist);
695	>	free((void *)vnlist);
696		nvns = 0;
697		}
698		}
699
700
701		int
702	<	newv(x, y, z)                   /* create a new vertex */
703	<	double  x, y, z;
702	>	newv(                   /* create a new vertex */
703	>	double  x,
704	>	double  y,
705	>	double  z
706	>	)
707		{
708		if (!(nvs%CHUNKSIZ)) {          /* allocate next block */
709		if (nvs == 0)
710		vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
711		else
712	<	vlist = (FVECT *)realloc((char *)vlist,
712	>	vlist = (FVECT *)realloc((void *)vlist,
713		(nvs+CHUNKSIZ)*sizeof(FVECT));
714		if (vlist == NULL) {
715		fprintf(stderr,
#	Line 724 | Line 726 | double x, y, z;
726
727
728		int
729	<	newvn(x, y, z)                  /* create a new vertex normal */
730	<	double  x, y, z;
729	>	newvn(                  /* create a new vertex normal */
730	>	double  x,
731	>	double  y,
732	>	double  z
733	>	)
734		{
735		if (!(nvns%CHUNKSIZ)) {         /* allocate next block */
736		if (nvns == 0)
737		vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
738		else
739	<	vnlist = (FVECT *)realloc((char *)vnlist,
739	>	vnlist = (FVECT *)realloc((void *)vnlist,
740		(nvns+CHUNKSIZ)*sizeof(FVECT));
741		if (vnlist == NULL) {
742		fprintf(stderr,
#	Line 750 | Line 755 | double x, y, z;
755
756
757		int
758	<	newvt(x, y)                     /* create a new texture map vertex */
759	<	double  x, y;
758	>	newvt(                  /* create a new texture map vertex */
759	>	double  x,
760	>	double  y
761	>	)
762		{
763		if (!(nvts%CHUNKSIZ)) {         /* allocate next block */
764		if (nvts == 0)
765	<	vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT));
765	>	vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL));
766		else
767	<	vtlist = (FLOAT (*)[2])realloc((char *)vtlist,
768	<	(nvts+CHUNKSIZ)*2*sizeof(FLOAT));
767	>	vtlist = (RREAL (*)[2])realloc((void *)vtlist,
768	>	(nvts+CHUNKSIZ)*2*sizeof(RREAL));
769		if (vtlist == NULL) {
770		fprintf(stderr,
771		"Out of memory while allocating texture vertex %d\n",
#	Line 773 | Line 780 | double x, y;
780		}
781
782
783	<	syntax(er)                      /* report syntax error and exit */
784	<	char    *er;
783	>	void
784	>	syntax(                 /* report syntax error and exit */
785	>	char    *er
786	>	)
787		{
788		fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n",
789		inpfile, lineno, er);

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