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

Comparing ray/src/cv/obj2rad.c (file contents):
Revision 2.14 by greg, Wed Jun 15 19:06:04 1994 UTC vs.
Revision 2.22 by schorsch, Sat Nov 15 17:54:06 2003 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 */
#	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();
314		static char     sbuf[MAXARG*10];
#	Line 325 | Line 340 | FILE   *fp;
340
341
342		char *
343	<	getmtl()                                /* figure material for this face */
343	>	getmtl(void)                            /* figure material for this face */
344		{
345		register RULEHD *rp = ourmapping;
346
#	Line 351 | Line 366 | getmtl()                               /* figure material for this face */
366
367
368		char *
369	<	getonm()                                /* invent a good name for object */
369	>	getonm(void)                            /* invent a good name for object */
370		{
371		static char     name[64];
372		register char   *cp1, *cp2;
#	Line 366 | Line 381 | getonm()                               /* invent a good name for object */
381		cp2 = group[i];
382		if (cp1 > name)
383		*cp1++ = '.';
384	<	while (*cp1 = *cp2++)
384	>	while ( (*cp1 = *cp2++) )
385		if (++cp1 >= name+sizeof(name)-2) {
386		*cp1 = '\0';
387		return(name);
#	Line 376 | Line 391 | getonm()                               /* invent a good name for object */
391		}
392
393
394	<	matchrule(rp)                           /* check for a match on this rule */
395	<	register RULEHD *rp;
394	>	int
395	>	matchrule(                              /* check for a match on this rule */
396	>	register RULEHD *rp
397	>	)
398		{
399		ID      tmpid;
400		int     gotmatch;
#	Line 427 | Line 444 | register RULEHD        *rp;
444		}
445
446
447	<	cvtndx(vi, vs)                          /* convert vertex string to index */
448	<	register VNDX   vi;
449	<	register char   *vs;
447	>	int
448	>	cvtndx(                         /* convert vertex string to index */
449	>	register VNDX   vi,
450	>	register char   *vs
451	>	)
452		{
453		/* get point */
454		vi[0] = atoi(vs);
#	Line 474 | Line 493 | register char  *vs;
493		}
494
495
496	<	nonplanar(ac, av)                       /* are vertices non-planar? */
497	<	register int    ac;
498	<	register char   **av;
496	>	int
497	>	nonplanar(                      /* are vertices non-planar? */
498	>	register int    ac,
499	>	register char   **av
500	>	)
501		{
502		VNDX    vi;
503	<	FLOAT   *p0, *p1;
503	>	RREAL   *p0, *p1;
504		FVECT   v1, v2, nsum, newn;
505		double  d;
506		register int    i;
#	Line 525 | Line 546 | register char  **av;
546		}
547
548
549	<	putface(ac, av)                         /* put out an N-sided polygon */
550	<	int     ac;
551	<	register char   **av;
549	>	int
550	>	putface(                                /* put out an N-sided polygon */
551	>	int     ac,
552	>	register char   **av
553	>	)
554		{
555		VNDX    vi;
556		char    *cp;
#	Line 558 | Line 581 | register char  **av;
581		}
582
583
584	<	puttri(v1, v2, v3)                      /* put out a triangle */
585	<	char    *v1, *v2, *v3;
584	>	int
585	>	puttri(                 /* put out a triangle */
586	>	char *v1,
587	>	char *v2,
588	>	char *v3
589	>	)
590		{
591		char    *mod;
592		VNDX    v1i, v2i, v3i;
593		BARYCCM bvecs;
594	<	FLOAT   bcoor[3][3];
595	<	int     texOK, patOK;
594	>	RREAL   bcoor[3][3];
595	>	int     texOK = 0, patOK;
596	>	int     flatness;
597		register int    i;
598
599		if ((mod = getmtl()) == NULL)
#	Line 574 | Line 602 | char   *v1, *v2, *v3;
602		if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3))
603		return(0);
604		/* compute barycentric coordinates */
605	<	texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0);
605	>	if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0)
606	>	flatness = flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]],
607	>	vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]]);
608	>	else
609	>	flatness = ISFLAT;
610	>
611	>	switch (flatness) {
612	>	case DEGEN:                     /* zero area */
613	>	return(-1);
614	>	case RVFLAT:                    /* reversed normals, but flat */
615	>	case ISFLAT:                    /* smoothing unnecessary */
616	>	texOK = 0;
617	>	break;
618	>	case RVBENT:                    /* reversed normals with smoothing */
619	>	case ISBENT:                    /* proper smoothing */
620	>	texOK = 1;
621	>	break;
622	>	}
623	>	if (flatten)
624	>	texOK = 0;
625		#ifdef TEXMAPS
626		patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0);
627		#else
#	Line 612 | Line 659 | char   *v1, *v2, *v3;
659		put_baryc(&bvecs, bcoor, 2);
660		}
661		#endif
662	<	/* put out triangle */
662	>	/* put out (reversed) triangle */
663		printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
664		printf("0\n0\n9\n");
665	<	pvect(vlist[v1i[0]]);
666	<	pvect(vlist[v2i[0]]);
667	<	pvect(vlist[v3i[0]]);
668	<
665	>	if (flatness == RVFLAT || flatness == RVBENT) {
666	>	pvect(vlist[v3i[0]]);
667	>	pvect(vlist[v2i[0]]);
668	>	pvect(vlist[v1i[0]]);
669	>	} else {
670	>	pvect(vlist[v1i[0]]);
671	>	pvect(vlist[v2i[0]]);
672	>	pvect(vlist[v3i[0]]);
673	>	}
674		return(1);
675		}
676
677
678	<	int
679	<	comp_baryc(bcm, v1, v2, v3)             /* compute barycentric vectors */
628	<	register BARYCCM        *bcm;
629	<	FLOAT   *v1, *v2, *v3;
678	>	void
679	>	freeverts(void)                 /* free all vertices */
680		{
631	–	FLOAT   *vt;
632	–	FVECT   va, vab, vcb;
633	–	double  d;
634	–	int     ax0, ax1;
635	–	register int    i, j;
636	–	/* compute major axis */
637	–	for (i = 0; i < 3; i++) {
638	–	vab[i] = v1[i] - v2[i];
639	–	vcb[i] = v3[i] - v2[i];
640	–	}
641	–	fcross(va, vab, vcb);
642	–	bcm->ax = ABS(va[0]) > ABS(va[1]) ? 0 : 1;
643	–	bcm->ax = ABS(va[bcm->ax]) > ABS(va[2]) ? bcm->ax : 2;
644	–	ax0 = (bcm->ax + 1) % 3;
645	–	ax1 = (bcm->ax + 2) % 3;
646	–	for (j = 0; j < 2; j++) {
647	–	vab[0] = v1[ax0] - v2[ax0];
648	–	vcb[0] = v3[ax0] - v2[ax0];
649	–	vab[1] = v1[ax1] - v2[ax1];
650	–	vcb[1] = v3[ax1] - v2[ax1];
651	–	d = vcb[0]*vcb[0] + vcb[1]*vcb[1];
652	–	if (d <= FTINY)
653	–	return(-1);
654	–	d = (vcb[0]*vab[0]+vcb[1]*vab[1])/d;
655	–	va[0] = vab[0] - vcb[0]*d;
656	–	va[1] = vab[1] - vcb[1]*d;
657	–	d = va[0]*va[0] + va[1]*va[1];
658	–	if (d <= FTINY)
659	–	return(-1);
660	–	bcm->tm[j][0] = va[0] /= d;
661	–	bcm->tm[j][1] = va[1] /= d;
662	–	bcm->tm[j][2] = -(v2[ax0]*va[0]+v2[ax1]*va[1]);
663	–	/* rotate vertices */
664	–	vt = v1;
665	–	v1 = v2;
666	–	v2 = v3;
667	–	v3 = vt;
668	–	}
669	–	return(0);
670	–	}
671	–
672	–
673	–	put_baryc(bcm, com, n)                  /* put barycentric coord. vectors */
674	–	register BARYCCM        *bcm;
675	–	register FLOAT  com[][3];
676	–	int     n;
677	–	{
678	–	double  a, b;
679	–	register int    i, j;
680	–
681	–	printf("%d\t%d\n", 1+3*n, bcm->ax);
682	–	for (i = 0; i < n; i++) {
683	–	a = com[i][0] - com[i][2];
684	–	b = com[i][1] - com[i][2];
685	–	printf("%14.8f %14.8f %14.8f\n",
686	–	bcm->tm[0][0]*a + bcm->tm[1][0]*b,
687	–	bcm->tm[0][1]*a + bcm->tm[1][1]*b,
688	–	bcm->tm[0][2]*a + bcm->tm[1][2]*b + com[i][2]);
689	–	}
690	–	}
691	–
692	–
693	–	freeverts()                     /* free all vertices */
694	–	{
681		if (nvs) {
682	<	free((char *)vlist);
682	>	free((void *)vlist);
683		nvs = 0;
684		}
685		if (nvts) {
686	<	free((char *)vtlist);
686	>	free((void *)vtlist);
687		nvts = 0;
688		}
689		if (nvns) {
690	<	free((char *)vnlist);
690	>	free((void *)vnlist);
691		nvns = 0;
692		}
693		}
694
695
696		int
697	<	newv(x, y, z)                   /* create a new vertex */
698	<	double  x, y, z;
697	>	newv(                   /* create a new vertex */
698	>	double  x,
699	>	double  y,
700	>	double  z
701	>	)
702		{
703		if (!(nvs%CHUNKSIZ)) {          /* allocate next block */
704		if (nvs == 0)
705		vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
706		else
707	<	vlist = (FVECT *)realloc((char *)vlist,
707	>	vlist = (FVECT *)realloc((void *)vlist,
708		(nvs+CHUNKSIZ)*sizeof(FVECT));
709		if (vlist == NULL) {
710		fprintf(stderr,
#	Line 732 | Line 721 | double x, y, z;
721
722
723		int
724	<	newvn(x, y, z)                  /* create a new vertex normal */
725	<	double  x, y, z;
724	>	newvn(                  /* create a new vertex normal */
725	>	double  x,
726	>	double  y,
727	>	double  z
728	>	)
729		{
730		if (!(nvns%CHUNKSIZ)) {         /* allocate next block */
731		if (nvns == 0)
732		vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
733		else
734	<	vnlist = (FVECT *)realloc((char *)vnlist,
734	>	vnlist = (FVECT *)realloc((void *)vnlist,
735		(nvns+CHUNKSIZ)*sizeof(FVECT));
736		if (vnlist == NULL) {
737		fprintf(stderr,
#	Line 758 | Line 750 | double x, y, z;
750
751
752		int
753	<	newvt(x, y)                     /* create a new texture map vertex */
754	<	double  x, y;
753	>	newvt(                  /* create a new texture map vertex */
754	>	double  x,
755	>	double  y
756	>	)
757		{
758		if (!(nvts%CHUNKSIZ)) {         /* allocate next block */
759		if (nvts == 0)
760	<	vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT));
760	>	vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL));
761		else
762	<	vtlist = (FLOAT (*)[2])realloc((char *)vtlist,
763	<	(nvts+CHUNKSIZ)*2*sizeof(FLOAT));
762	>	vtlist = (RREAL (*)[2])realloc((void *)vtlist,
763	>	(nvts+CHUNKSIZ)*2*sizeof(RREAL));
764		if (vtlist == NULL) {
765		fprintf(stderr,
766		"Out of memory while allocating texture vertex %d\n",
#	Line 781 | Line 775 | double x, y;
775		}
776
777
778	<	syntax(er)                      /* report syntax error and exit */
779	<	char    *er;
778	>	void
779	>	syntax(                 /* report syntax error and exit */
780	>	char    *er
781	>	)
782		{
783		fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n",
784		inpfile, lineno, er);

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