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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 2.19 by greg, Wed Apr 23 00:52:33 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 17 | Line 14 | static char SCCSid[] = "$SunId$ LBL";
14
15		#include "trans.h"
16
17	+	#include "tmesh.h"
18	+
19		#include <ctype.h>
20
22	–	#define TCALNAME        "tmesh.cal"     /* triangle interp. file */
21		#define PATNAME         "M-pat"         /* mesh pattern name (reused) */
22		#define TEXNAME         "M-nor"         /* mesh texture name (reused) */
23		#define DEFOBJ          "unnamed"       /* default object name */
24		#define DEFMAT          "white"         /* default material name */
25
28	–	#define  ABS(x)         ((x)>=0 ? (x) : -(x))
29	–
26		#define pvect(v)        printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2])
27
28		FVECT   *vlist;                 /* our vertex list */
#	Line 36 | Line 32 | int    nvns;
32		FLOAT   (*vtlist)[2];           /* map vertex list */
33		int     nvts;
34
39	–	typedef struct {
40	–	int     ax;             /* major axis */
41	–	FLOAT   tm[2][3];       /* transformation */
42	–	} BARYCCM;
43	–
35		typedef int     VNDX[3];        /* vertex index (point,map,normal) */
36
37		#define CHUNKSIZ        256     /* vertex allocation chunk size */
#	Line 566 | Line 557 | char   *v1, *v2, *v3;
557		BARYCCM bvecs;
558		FLOAT   bcoor[3][3];
559		int     texOK, patOK;
560	+	int     flatness;
561		register int    i;
562
563		if ((mod = getmtl()) == NULL)
#	Line 574 | Line 566 | char   *v1, *v2, *v3;
566		if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3))
567		return(0);
568		/* compute barycentric coordinates */
569	<	texOK = !flatten && (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0);
569	>	if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0)
570	>	flatness = flat_tri(vlist[v1i[0]], vlist[v2i[0]], vlist[v3i[0]],
571	>	vnlist[v1i[2]], vnlist[v2i[2]], vnlist[v3i[2]]);
572	>	else
573	>	flatness = ISFLAT;
574	>
575	>	switch (flatness) {
576	>	case DEGEN:                     /* zero area */
577	>	return(-1);
578	>	case RVFLAT:                    /* reversed normals, but flat */
579	>	case ISFLAT:                    /* smoothing unnecessary */
580	>	texOK = 0;
581	>	break;
582	>	case RVBENT:                    /* reversed normals with smoothing */
583	>	case ISBENT:                    /* proper smoothing */
584	>	texOK = 1;
585	>	break;
586	>	}
587	>	if (flatten)
588	>	texOK = 0;
589		#ifdef TEXMAPS
590		patOK = mapname[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0);
591		#else
#	Line 612 | Line 623 | char   *v1, *v2, *v3;
623		put_baryc(&bvecs, bcoor, 2);
624		}
625		#endif
626	<	/* put out triangle */
626	>	/* put out (reversed) triangle */
627		printf("\n%s polygon %s.%d\n", mod, getonm(), faceno);
628		printf("0\n0\n9\n");
629	<	pvect(vlist[v1i[0]]);
630	<	pvect(vlist[v2i[0]]);
631	<	pvect(vlist[v3i[0]]);
632	<
629	>	if (flatness == RVFLAT || flatness == RVBENT) {
630	>	pvect(vlist[v3i[0]]);
631	>	pvect(vlist[v2i[0]]);
632	>	pvect(vlist[v1i[0]]);
633	>	} else {
634	>	pvect(vlist[v1i[0]]);
635	>	pvect(vlist[v2i[0]]);
636	>	pvect(vlist[v3i[0]]);
637	>	}
638		return(1);
639		}
640
641
626	–	int
627	–	comp_baryc(bcm, v1, v2, v3)             /* compute barycentric vectors */
628	–	register BARYCCM        *bcm;
629	–	FLOAT   *v1, *v2, *v3;
630	–	{
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	–
642		freeverts()                     /* free all vertices */
643		{
644		if (nvs) {
645	<	free((char *)vlist);
645	>	free((void *)vlist);
646		nvs = 0;
647		}
648		if (nvts) {
649	<	free((char *)vtlist);
649	>	free((void *)vtlist);
650		nvts = 0;
651		}
652		if (nvns) {
653	<	free((char *)vnlist);
653	>	free((void *)vnlist);
654		nvns = 0;
655		}
656		}
#	Line 715 | Line 664 | double x, y, z;
664		if (nvs == 0)
665		vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
666		else
667	<	vlist = (FVECT *)realloc((char *)vlist,
667	>	vlist = (FVECT *)realloc((void *)vlist,
668		(nvs+CHUNKSIZ)*sizeof(FVECT));
669		if (vlist == NULL) {
670		fprintf(stderr,
#	Line 739 | Line 688 | double x, y, z;
688		if (nvns == 0)
689		vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT));
690		else
691	<	vnlist = (FVECT *)realloc((char *)vnlist,
691	>	vnlist = (FVECT *)realloc((void *)vnlist,
692		(nvns+CHUNKSIZ)*sizeof(FVECT));
693		if (vnlist == NULL) {
694		fprintf(stderr,
#	Line 765 | Line 714 | double x, y;
714		if (nvts == 0)
715		vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT));
716		else
717	<	vtlist = (FLOAT (*)[2])realloc((char *)vtlist,
717	>	vtlist = (FLOAT (*)[2])realloc((void *)vtlist,
718		(nvts+CHUNKSIZ)*2*sizeof(FLOAT));
719		if (vtlist == NULL) {
720		fprintf(stderr,

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