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greg |
2.1 |
/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* Convert a Wavefront .obj file to Radiance format. |
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* |
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* Currently, we support only polygonal geometry, and faces |
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* must be either quads or triangles for smoothing to work. |
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* Also, texture indices only work for triangles, though |
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* I'm not sure they work correctly. |
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*/ |
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#include "standard.h" |
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#include <ctype.h> |
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#define VOIDID "void" /* this is defined in object.h */ |
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#define TCALNAME "tmesh.cal" /* triangle interp. file */ |
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#define QCALNAME "surf.cal" /* quad interp. file */ |
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#define PATNAME "M-pat" /* mesh pattern name (reused) */ |
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#define TEXNAME "M-nor" /* mesh texture name (reused) */ |
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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#define pvect(v) printf("%18.12g %18.12g %18.12g\n",(v)[0],(v)[1],(v)[2]) |
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FVECT *vlist; /* our vertex list */ |
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int nvs; /* number of vertices in our list */ |
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FVECT *vnlist; /* vertex normal list */ |
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int nvns; |
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FLOAT (*vtlist)[2]; /* texture vertex list */ |
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int nvts; |
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typedef FLOAT BARYCCM[3][4]; /* barycentric coordinate system */ |
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typedef int VNDX[3]; /* vertex index (point,texture,normal) */ |
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#define CHUNKSIZ 128 /* vertex allocation chunk size */ |
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#define MAXARG 64 /* maximum # arguments in a statement */ |
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char *defmat = VOIDID; /* default (starting) material name */ |
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char *defpat = ""; /* default (starting) picture name */ |
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char *defobj = "F"; /* default (starting) object name */ |
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char picfile[128]; /* current picture file */ |
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char matname[64]; /* current material name */ |
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char objname[128]; /* current object name */ |
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int lineno; /* current line number */ |
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int nfaces; /* total number of faces output */ |
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main(argc, argv) /* read in T-mesh files and convert */ |
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int argc; |
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char *argv[]; |
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{ |
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FILE *fp; |
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int i; |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 'o': /* object name */ |
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defobj = argv[++i]; |
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break; |
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case 'm': /* default material */ |
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defmat = argv[++i]; |
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break; |
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case 'p': /* default picture */ |
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defpat = argv[++i]; |
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break; |
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default: |
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fprintf(stderr, |
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"Usage: %s [-o obj][-m mat][-p pic] [file ..]\n", |
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argv[0]); |
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exit(1); |
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} |
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if (i >= argc) |
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convert("<stdin>", stdin); |
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else |
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for ( ; i < argc; i++) { |
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if ((fp = fopen(argv[i], "r")) == NULL) { |
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perror(argv[i]); |
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exit(1); |
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} |
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convert(argv[i], fp); |
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fclose(fp); |
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} |
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exit(0); |
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} |
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convert(fname, fp) /* convert a T-mesh */ |
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char *fname; |
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FILE *fp; |
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{ |
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char *argv[MAXARG]; |
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int argc; |
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int nstats, nunknown; |
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register int i; |
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/* start fresh */ |
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freeverts(); |
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strcpy(picfile, defpat); |
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strcpy(matname, defmat); |
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strcpy(objname, defobj); |
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lineno = 0; |
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nstats = nunknown = 0; |
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printf("\n# Wavefront file read from: %s\n", fname); |
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/* scan until EOF */ |
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while (argc = getstmt(argv, fp)) { |
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switch (argv[0][0]) { |
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case 'v': /* vertex */ |
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switch (argv[0][1]) { |
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case '\0': /* point */ |
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if (badarg(argc-1,argv+1,"fff")) |
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syntax(fname, lineno, "Bad vertex"); |
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newv(atof(argv[1]), atof(argv[2]), |
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atof(argv[3])); |
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break; |
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case 'n': /* normal */ |
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if (argv[0][2]) |
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goto unknown; |
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if (badarg(argc-1,argv+1,"fff")) |
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syntax(fname, lineno, "Bad normal"); |
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if (!newvn(atof(argv[1]), atof(argv[2]), |
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atof(argv[3]))) |
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syntax(fname, lineno, "Zero normal"); |
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break; |
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case 't': /* texture */ |
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if (argv[0][2]) |
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goto unknown; |
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if (badarg(argc-1,argv+1,"ff")) |
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goto unknown; |
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newvt(atof(argv[1]), atof(argv[2])); |
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break; |
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default: |
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goto unknown; |
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} |
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break; |
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case 'f': /* face */ |
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if (argv[0][1]) |
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goto unknown; |
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switch (argc-1) { |
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case 0: case 1: case 2: |
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syntax(fname, lineno, "Too few vertices"); |
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break; |
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case 3: |
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if (!puttri(argv[1], argv[2], argv[3])) |
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syntax(fname, lineno, "Bad triangle"); |
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break; |
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case 4: |
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if (!putquad(argv[1], argv[2], |
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argv[3], argv[4])) |
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syntax(fname, lineno, "Bad quad"); |
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break; |
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default: |
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if (!putface(argc-1, argv+1)) |
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syntax(fname, lineno, "Bad face"); |
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break; |
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} |
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break; |
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case 'u': |
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if (!strcmp(argv[0], "usemtl")) { /* material */ |
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if (argc < 2) |
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break; /* not fatal */ |
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strcpy(matname, argv[1]); |
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} else if (!strcmp(argv[0], "usemap")) {/* map */ |
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if (argc < 2) |
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break; /* not fatal */ |
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if (!strcmp(argv[1], "off")) |
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picfile[0] = '\0'; |
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else |
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strcpy(picfile, argv[1]); |
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} else |
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goto unknown; |
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break; |
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case 'o': /* object name */ |
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if (argv[0][1]) |
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goto unknown; |
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if (argc < 2) |
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break; /* not fatal */ |
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strcpy(objname, argv[1]); |
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break; |
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case 'g': /* group name(s) */ |
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if (argv[0][1]) |
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goto unknown; |
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if (argc < 2) |
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break; /* not fatal */ |
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objname[0] = '\0'; |
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for (i = 1; i < argc; i++) |
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if (objname[0]) |
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sprintf(objname+strlen(objname), |
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".%s", argv[i]); |
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else |
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strcpy(objname, argv[i]); |
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break; |
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case '#': /* comment */ |
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break; |
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default:; /* something we don't deal with */ |
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unknown: |
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nunknown++; |
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break; |
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} |
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nstats++; |
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} |
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greg |
2.2 |
printf("\n# Done processing file: %s\n", fname); |
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greg |
2.1 |
printf("# %d lines, %d statements, %d unrecognized\n", |
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lineno, nstats, nunknown); |
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} |
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int |
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getstmt(av, fp) /* read the next statement from fp */ |
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register char *av[MAXARG]; |
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FILE *fp; |
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{ |
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extern char *fgetline(); |
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static char sbuf[MAXARG*10]; |
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register char *cp; |
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register int i; |
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do { |
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if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
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return(0); |
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i = 0; |
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for ( ; ; ) { |
| 232 |
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while (isspace(*cp) || *cp == '\\') { |
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if (*cp == '\n') |
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lineno++; |
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*cp++ = '\0'; |
| 236 |
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} |
| 237 |
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if (!*cp || i >= MAXARG-1) |
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break; |
| 239 |
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av[i++] = cp; |
| 240 |
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while (*++cp && !isspace(*cp)) |
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; |
| 242 |
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} |
| 243 |
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av[i] = NULL; |
| 244 |
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lineno++; |
| 245 |
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} while (!i); |
| 246 |
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| 247 |
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return(i); |
| 248 |
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} |
| 249 |
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| 250 |
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| 251 |
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cvtndx(vi, vs) /* convert vertex string to index */ |
| 252 |
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register VNDX vi; |
| 253 |
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register char *vs; |
| 254 |
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{ |
| 255 |
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/* get point */ |
| 256 |
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vi[0] = atoi(vs); |
| 257 |
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if (vi[0] > 0) { |
| 258 |
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if (vi[0]-- > nvs) |
| 259 |
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return(0); |
| 260 |
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} else if (vi[0] < 0) { |
| 261 |
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vi[0] = nvs + vi[0]; |
| 262 |
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if (vi[0] < 0) |
| 263 |
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return(0); |
| 264 |
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} else |
| 265 |
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return(0); |
| 266 |
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/* get texture */ |
| 267 |
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while (*vs) |
| 268 |
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if (*vs++ == '/') |
| 269 |
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break; |
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vi[1] = atoi(vs); |
| 271 |
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if (vi[1] > 0) { |
| 272 |
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if (vi[1]-- > nvts) |
| 273 |
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return(0); |
| 274 |
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} else if (vi[1] < 0) { |
| 275 |
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vi[1] = nvts + vi[1]; |
| 276 |
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if (vi[1] < 0) |
| 277 |
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return(0); |
| 278 |
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} else |
| 279 |
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vi[1] = -1; |
| 280 |
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/* get normal */ |
| 281 |
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while (*vs) |
| 282 |
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if (*vs++ == '/') |
| 283 |
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break; |
| 284 |
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vi[2] = atoi(vs); |
| 285 |
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if (vi[2] > 0) { |
| 286 |
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if (vi[2]-- > nvns) |
| 287 |
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return(0); |
| 288 |
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} else if (vi[2] < 0) { |
| 289 |
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vi[2] = nvns + vi[2]; |
| 290 |
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if (vi[2] < 0) |
| 291 |
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return(0); |
| 292 |
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} else |
| 293 |
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vi[2] = -1; |
| 294 |
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return(1); |
| 295 |
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} |
| 296 |
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| 297 |
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| 298 |
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putface(ac, av) /* put out an N-sided polygon */ |
| 299 |
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register int ac; |
| 300 |
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register char **av; |
| 301 |
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{ |
| 302 |
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VNDX vi; |
| 303 |
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| 304 |
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printf("\n%s polygon %s.%d\n", matname, objname, ++nfaces); |
| 305 |
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printf("0\n0\n%d\n", 3*ac); |
| 306 |
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while (ac--) { |
| 307 |
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if (!cvtndx(vi, *av++)) |
| 308 |
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return(0); |
| 309 |
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pvect(vlist[vi[0]]); |
| 310 |
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} |
| 311 |
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return(1); |
| 312 |
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} |
| 313 |
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| 314 |
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| 315 |
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puttri(v1, v2, v3) /* put out a triangle */ |
| 316 |
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char *v1, *v2, *v3; |
| 317 |
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{ |
| 318 |
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char *mod = matname; |
| 319 |
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VNDX v1i, v2i, v3i; |
| 320 |
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BARYCCM bvecs; |
| 321 |
greg |
2.2 |
int texOK, patOK; |
| 322 |
greg |
2.1 |
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| 323 |
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
| 324 |
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return(0); |
| 325 |
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/* compute barycentric coordinates */ |
| 326 |
greg |
2.2 |
texOK = (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0); |
| 327 |
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patOK = picfile[0] && (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0); |
| 328 |
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if (texOK | patOK) |
| 329 |
greg |
2.1 |
if (comp_baryc(bvecs, vlist[v1i[0]], vlist[v2i[0]], |
| 330 |
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vlist[v3i[0]]) < 0) |
| 331 |
greg |
2.2 |
return(-1); |
| 332 |
greg |
2.1 |
/* put out texture (if any) */ |
| 333 |
greg |
2.2 |
if (texOK) { |
| 334 |
greg |
2.1 |
printf("\n%s texfunc %s\n", mod, TEXNAME); |
| 335 |
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mod = TEXNAME; |
| 336 |
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printf("4 dx dy dz %s\n", TCALNAME); |
| 337 |
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printf("0\n21\n"); |
| 338 |
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put_baryc(bvecs); |
| 339 |
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printf("\t%14.12g %14.12g %14.12g\n", |
| 340 |
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vnlist[v1i[2]][0], vnlist[v2i[2]][0], |
| 341 |
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vnlist[v3i[2]][0]); |
| 342 |
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printf("\t%14.12g %14.12g %14.12g\n", |
| 343 |
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vnlist[v1i[2]][1], vnlist[v2i[2]][1], |
| 344 |
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vnlist[v3i[2]][1]); |
| 345 |
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printf("\t%14.12g %14.12g %14.12g\n", |
| 346 |
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vnlist[v1i[2]][2], vnlist[v2i[2]][2], |
| 347 |
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vnlist[v3i[2]][2]); |
| 348 |
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} |
| 349 |
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/* put out pattern (if any) */ |
| 350 |
greg |
2.2 |
if (patOK) { |
| 351 |
greg |
2.1 |
printf("\n%s colorpict %s\n", mod, PATNAME); |
| 352 |
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mod = PATNAME; |
| 353 |
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printf("7 noneg noneg noneg %s %s u v\n", picfile, TCALNAME); |
| 354 |
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printf("0\n18\n"); |
| 355 |
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put_baryc(bvecs); |
| 356 |
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printf("\t%f %f %f\n", vtlist[v1i[1]][0], |
| 357 |
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vtlist[v2i[1]][0], vtlist[v3i[1]][0]); |
| 358 |
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printf("\t%f %f %f\n", vtlist[v1i[1]][1], |
| 359 |
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vtlist[v2i[1]][1], vtlist[v3i[1]][1]); |
| 360 |
|
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} |
| 361 |
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/* put out triangle */ |
| 362 |
greg |
2.2 |
printf("\n%s polygon %s.%d\n", mod, objname, ++nfaces); |
| 363 |
greg |
2.1 |
printf("0\n0\n9\n"); |
| 364 |
|
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pvect(vlist[v1i[0]]); |
| 365 |
|
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pvect(vlist[v2i[0]]); |
| 366 |
|
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pvect(vlist[v3i[0]]); |
| 367 |
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| 368 |
|
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return(1); |
| 369 |
|
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} |
| 370 |
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| 371 |
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| 372 |
|
|
int |
| 373 |
|
|
comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
| 374 |
|
|
register BARYCCM bcm; |
| 375 |
|
|
FLOAT *v1, *v2, *v3; |
| 376 |
|
|
{ |
| 377 |
|
|
FLOAT *vt; |
| 378 |
|
|
FVECT va, vab, vcb; |
| 379 |
|
|
double d; |
| 380 |
|
|
register int i, j; |
| 381 |
|
|
|
| 382 |
|
|
for (j = 0; j < 3; j++) { |
| 383 |
|
|
for (i = 0; i < 3; i++) { |
| 384 |
|
|
vab[i] = v1[i] - v2[i]; |
| 385 |
|
|
vcb[i] = v3[i] - v2[i]; |
| 386 |
|
|
} |
| 387 |
|
|
d = DOT(vcb,vcb); |
| 388 |
|
|
if (d <= FTINY) |
| 389 |
|
|
return(-1); |
| 390 |
|
|
d = DOT(vcb,vab)/d; |
| 391 |
|
|
for (i = 0; i < 3; i++) |
| 392 |
|
|
va[i] = vab[i] - vcb[i]*d; |
| 393 |
|
|
d = DOT(va,va); |
| 394 |
|
|
if (d <= FTINY) |
| 395 |
|
|
return(-1); |
| 396 |
|
|
for (i = 0; i < 3; i++) { |
| 397 |
|
|
va[i] /= d; |
| 398 |
|
|
bcm[j][i] = va[i]; |
| 399 |
|
|
} |
| 400 |
|
|
bcm[j][3] = -DOT(v2,va); |
| 401 |
|
|
/* rotate vertices */ |
| 402 |
|
|
vt = v1; |
| 403 |
|
|
v1 = v2; |
| 404 |
|
|
v2 = v3; |
| 405 |
|
|
v3 = vt; |
| 406 |
|
|
} |
| 407 |
|
|
return(0); |
| 408 |
|
|
} |
| 409 |
|
|
|
| 410 |
|
|
|
| 411 |
|
|
put_baryc(bcm) /* put barycentric coord. vectors */ |
| 412 |
|
|
register BARYCCM bcm; |
| 413 |
|
|
{ |
| 414 |
|
|
register int i; |
| 415 |
|
|
|
| 416 |
|
|
for (i = 0; i < 3; i++) |
| 417 |
|
|
printf("%14.8f %14.8f %14.8f %14.8f\n", |
| 418 |
|
|
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
| 419 |
|
|
} |
| 420 |
|
|
|
| 421 |
|
|
|
| 422 |
|
|
putquad(p0, p1, p2, p3) /* put out a quadrilateral */ |
| 423 |
|
|
char *p0, *p1, *p2, *p3; |
| 424 |
|
|
{ |
| 425 |
|
|
VNDX p0i, p1i, p2i, p3i; |
| 426 |
|
|
FVECT norm[4]; |
| 427 |
|
|
int axis; |
| 428 |
|
|
FVECT v1, v2, vc1, vc2; |
| 429 |
|
|
int ok1, ok2; |
| 430 |
|
|
/* get actual indices */ |
| 431 |
|
|
if (!cvtndx(p0i,p0) || !cvtndx(p1i,p1) || |
| 432 |
|
|
!cvtndx(p2i,p2) || !cvtndx(p3i,p3)) |
| 433 |
|
|
return(0); |
| 434 |
|
|
/* compute exact normals */ |
| 435 |
|
|
fvsum(v1, vlist[p1i[0]], vlist[p0i[0]], -1.0); |
| 436 |
|
|
fvsum(v2, vlist[p2i[0]], vlist[p0i[0]], -1.0); |
| 437 |
|
|
fcross(vc1, v1, v2); |
| 438 |
|
|
ok1 = normalize(vc1) != 0.0; |
| 439 |
|
|
fvsum(v1, vlist[p2i[0]], vlist[p3i[0]], -1.0); |
| 440 |
|
|
fvsum(v2, vlist[p1i[0]], vlist[p3i[0]], -1.0); |
| 441 |
|
|
fcross(vc2, v1, v2); |
| 442 |
|
|
ok2 = normalize(vc2) != 0.0; |
| 443 |
|
|
if (!(ok1 | ok2)) |
| 444 |
greg |
2.2 |
return(-1); |
| 445 |
greg |
2.1 |
/* compute normal interpolation */ |
| 446 |
|
|
axis = norminterp(norm, p0i, p1i, p2i, p3i); |
| 447 |
|
|
|
| 448 |
|
|
/* put out quadrilateral? */ |
| 449 |
|
|
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
| 450 |
|
|
printf("\n%s ", matname); |
| 451 |
|
|
if (axis != -1) { |
| 452 |
|
|
printf("texfunc %s\n", TEXNAME); |
| 453 |
|
|
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 454 |
|
|
printf("0\n13\t%d\n", axis); |
| 455 |
|
|
pvect(norm[0]); |
| 456 |
|
|
pvect(norm[1]); |
| 457 |
|
|
pvect(norm[2]); |
| 458 |
|
|
fvsum(v1, norm[3], vc1, -0.5); |
| 459 |
|
|
fvsum(v1, v1, vc2, -0.5); |
| 460 |
|
|
pvect(v1); |
| 461 |
|
|
printf("\n%s ", TEXNAME); |
| 462 |
|
|
} |
| 463 |
|
|
printf("polygon %s.%d\n", objname, ++nfaces); |
| 464 |
|
|
printf("0\n0\n12\n"); |
| 465 |
|
|
pvect(vlist[p0i[0]]); |
| 466 |
|
|
pvect(vlist[p1i[0]]); |
| 467 |
|
|
pvect(vlist[p3i[0]]); |
| 468 |
|
|
pvect(vlist[p2i[0]]); |
| 469 |
|
|
return(1); |
| 470 |
|
|
} |
| 471 |
|
|
/* put out triangles? */ |
| 472 |
|
|
if (ok1) { |
| 473 |
|
|
printf("\n%s ", matname); |
| 474 |
|
|
if (axis != -1) { |
| 475 |
|
|
printf("texfunc %s\n", TEXNAME); |
| 476 |
|
|
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 477 |
|
|
printf("0\n13\t%d\n", axis); |
| 478 |
|
|
pvect(norm[0]); |
| 479 |
|
|
pvect(norm[1]); |
| 480 |
|
|
pvect(norm[2]); |
| 481 |
|
|
fvsum(v1, norm[3], vc1, -1.0); |
| 482 |
|
|
pvect(v1); |
| 483 |
|
|
printf("\n%s ", TEXNAME); |
| 484 |
|
|
} |
| 485 |
|
|
printf("polygon %s.%d\n", objname, ++nfaces); |
| 486 |
|
|
printf("0\n0\n9\n"); |
| 487 |
|
|
pvect(vlist[p0i[0]]); |
| 488 |
|
|
pvect(vlist[p1i[0]]); |
| 489 |
|
|
pvect(vlist[p2i[0]]); |
| 490 |
|
|
} |
| 491 |
|
|
if (ok2) { |
| 492 |
|
|
printf("\n%s ", matname); |
| 493 |
|
|
if (axis != -1) { |
| 494 |
|
|
printf("texfunc %s\n", TEXNAME); |
| 495 |
|
|
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
| 496 |
|
|
printf("0\n13\t%d\n", axis); |
| 497 |
|
|
pvect(norm[0]); |
| 498 |
|
|
pvect(norm[1]); |
| 499 |
|
|
pvect(norm[2]); |
| 500 |
|
|
fvsum(v2, norm[3], vc2, -1.0); |
| 501 |
|
|
pvect(v2); |
| 502 |
|
|
printf("\n%s ", TEXNAME); |
| 503 |
|
|
} |
| 504 |
|
|
printf("polygon %s.%d\n", objname, ++nfaces); |
| 505 |
|
|
printf("0\n0\n9\n"); |
| 506 |
|
|
pvect(vlist[p2i[0]]); |
| 507 |
|
|
pvect(vlist[p1i[0]]); |
| 508 |
|
|
pvect(vlist[p3i[0]]); |
| 509 |
|
|
} |
| 510 |
|
|
return(1); |
| 511 |
|
|
} |
| 512 |
|
|
|
| 513 |
|
|
|
| 514 |
|
|
int |
| 515 |
|
|
norminterp(resmat, p0i, p1i, p2i, p3i) /* compute normal interpolation */ |
| 516 |
|
|
register FVECT resmat[4]; |
| 517 |
|
|
register VNDX p0i, p1i, p2i, p3i; |
| 518 |
|
|
{ |
| 519 |
|
|
#define u ((ax+1)%3) |
| 520 |
|
|
#define v ((ax+2)%3) |
| 521 |
|
|
|
| 522 |
|
|
register int ax; |
| 523 |
|
|
MAT4 eqnmat; |
| 524 |
|
|
FVECT v1; |
| 525 |
|
|
register int i, j; |
| 526 |
|
|
|
| 527 |
|
|
if (!(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0)) |
| 528 |
|
|
return(-1); |
| 529 |
|
|
/* find dominant axis */ |
| 530 |
|
|
VCOPY(v1, vnlist[p0i[2]]); |
| 531 |
|
|
fvsum(v1, v1, vnlist[p1i[2]], 1.0); |
| 532 |
|
|
fvsum(v1, v1, vnlist[p2i[2]], 1.0); |
| 533 |
|
|
fvsum(v1, v1, vnlist[p3i[2]], 1.0); |
| 534 |
|
|
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
| 535 |
|
|
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
| 536 |
|
|
/* assign equation matrix */ |
| 537 |
|
|
eqnmat[0][0] = vlist[p0i[0]][u]*vlist[p0i[0]][v]; |
| 538 |
|
|
eqnmat[0][1] = vlist[p0i[0]][u]; |
| 539 |
|
|
eqnmat[0][2] = vlist[p0i[0]][v]; |
| 540 |
|
|
eqnmat[0][3] = 1.0; |
| 541 |
|
|
eqnmat[1][0] = vlist[p1i[0]][u]*vlist[p1i[0]][v]; |
| 542 |
|
|
eqnmat[1][1] = vlist[p1i[0]][u]; |
| 543 |
|
|
eqnmat[1][2] = vlist[p1i[0]][v]; |
| 544 |
|
|
eqnmat[1][3] = 1.0; |
| 545 |
|
|
eqnmat[2][0] = vlist[p2i[0]][u]*vlist[p2i[0]][v]; |
| 546 |
|
|
eqnmat[2][1] = vlist[p2i[0]][u]; |
| 547 |
|
|
eqnmat[2][2] = vlist[p2i[0]][v]; |
| 548 |
|
|
eqnmat[2][3] = 1.0; |
| 549 |
|
|
eqnmat[3][0] = vlist[p3i[0]][u]*vlist[p3i[0]][v]; |
| 550 |
|
|
eqnmat[3][1] = vlist[p3i[0]][u]; |
| 551 |
|
|
eqnmat[3][2] = vlist[p3i[0]][v]; |
| 552 |
|
|
eqnmat[3][3] = 1.0; |
| 553 |
|
|
/* invert matrix (solve system) */ |
| 554 |
|
|
if (!invmat4(eqnmat, eqnmat)) |
| 555 |
|
|
return(-1); /* no solution */ |
| 556 |
|
|
/* compute result matrix */ |
| 557 |
|
|
for (j = 0; j < 4; j++) |
| 558 |
|
|
for (i = 0; i < 3; i++) |
| 559 |
|
|
resmat[j][i] = eqnmat[j][0]*vnlist[p0i[2]][i] + |
| 560 |
|
|
eqnmat[j][1]*vnlist[p1i[2]][i] + |
| 561 |
|
|
eqnmat[j][2]*vnlist[p2i[2]][i] + |
| 562 |
|
|
eqnmat[j][3]*vnlist[p3i[2]][i]; |
| 563 |
|
|
return(ax); |
| 564 |
|
|
|
| 565 |
|
|
#undef u |
| 566 |
|
|
#undef v |
| 567 |
|
|
} |
| 568 |
|
|
|
| 569 |
|
|
|
| 570 |
|
|
freeverts() /* free all vertices */ |
| 571 |
|
|
{ |
| 572 |
|
|
if (nvs) { |
| 573 |
|
|
free((char *)vlist); |
| 574 |
|
|
nvs = 0; |
| 575 |
|
|
} |
| 576 |
|
|
if (nvts) { |
| 577 |
|
|
free((char *)vtlist); |
| 578 |
|
|
nvts = 0; |
| 579 |
|
|
} |
| 580 |
|
|
if (nvns) { |
| 581 |
|
|
free((char *)vnlist); |
| 582 |
|
|
nvns = 0; |
| 583 |
|
|
} |
| 584 |
|
|
} |
| 585 |
|
|
|
| 586 |
|
|
|
| 587 |
|
|
int |
| 588 |
|
|
newv(x, y, z) /* create a new vertex */ |
| 589 |
|
|
double x, y, z; |
| 590 |
|
|
{ |
| 591 |
|
|
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
| 592 |
|
|
if (nvs == 0) |
| 593 |
|
|
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 594 |
|
|
else |
| 595 |
|
|
vlist = (FVECT *)realloc((char *)vlist, |
| 596 |
|
|
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
| 597 |
|
|
if (vlist == NULL) { |
| 598 |
|
|
fprintf(stderr, |
| 599 |
|
|
"Out of memory while allocating vertex %d\n", nvs); |
| 600 |
|
|
exit(1); |
| 601 |
|
|
} |
| 602 |
|
|
} |
| 603 |
|
|
/* assign new vertex */ |
| 604 |
|
|
vlist[nvs][0] = x; |
| 605 |
|
|
vlist[nvs][1] = y; |
| 606 |
|
|
vlist[nvs][2] = z; |
| 607 |
|
|
return(++nvs); |
| 608 |
|
|
} |
| 609 |
|
|
|
| 610 |
|
|
|
| 611 |
|
|
int |
| 612 |
|
|
newvn(x, y, z) /* create a new vertex normal */ |
| 613 |
|
|
double x, y, z; |
| 614 |
|
|
{ |
| 615 |
|
|
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
| 616 |
|
|
if (nvns == 0) |
| 617 |
|
|
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
| 618 |
|
|
else |
| 619 |
|
|
vnlist = (FVECT *)realloc((char *)vnlist, |
| 620 |
|
|
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
| 621 |
|
|
if (vnlist == NULL) { |
| 622 |
|
|
fprintf(stderr, |
| 623 |
|
|
"Out of memory while allocating normal %d\n", nvns); |
| 624 |
|
|
exit(1); |
| 625 |
|
|
} |
| 626 |
|
|
} |
| 627 |
|
|
/* assign new normal */ |
| 628 |
|
|
vnlist[nvns][0] = x; |
| 629 |
|
|
vnlist[nvns][1] = y; |
| 630 |
|
|
vnlist[nvns][2] = z; |
| 631 |
|
|
if (normalize(vnlist[nvns]) == 0.0) |
| 632 |
|
|
return(0); |
| 633 |
|
|
return(++nvns); |
| 634 |
|
|
} |
| 635 |
|
|
|
| 636 |
|
|
|
| 637 |
|
|
int |
| 638 |
|
|
newvt(x, y) /* create a new texture vertex */ |
| 639 |
|
|
double x, y; |
| 640 |
|
|
{ |
| 641 |
|
|
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
| 642 |
|
|
if (nvts == 0) |
| 643 |
|
|
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
| 644 |
|
|
else |
| 645 |
|
|
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
| 646 |
|
|
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
| 647 |
|
|
if (vtlist == NULL) { |
| 648 |
|
|
fprintf(stderr, |
| 649 |
|
|
"Out of memory while allocating texture vertex %d\n", |
| 650 |
|
|
nvts); |
| 651 |
|
|
exit(1); |
| 652 |
|
|
} |
| 653 |
|
|
} |
| 654 |
|
|
/* assign new texture vertex */ |
| 655 |
|
|
vtlist[nvts][0] = x; |
| 656 |
|
|
vtlist[nvts][1] = y; |
| 657 |
|
|
return(++nvts); |
| 658 |
|
|
} |
| 659 |
|
|
|
| 660 |
|
|
|
| 661 |
|
|
syntax(fn, ln, er) /* report syntax error and exit */ |
| 662 |
|
|
char *fn; |
| 663 |
|
|
int ln; |
| 664 |
|
|
char *er; |
| 665 |
|
|
{ |
| 666 |
|
|
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
| 667 |
|
|
fn, ln, er); |
| 668 |
|
|
exit(1); |
| 669 |
|
|
} |
