1 |
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"); |
130 |
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if (!newvn(atof(argv[1]), atof(argv[2]), |
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atof(argv[3]))) |
132 |
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syntax(fname, lineno, "Zero normal"); |
133 |
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break; |
134 |
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case 't': /* texture */ |
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if (argv[0][2]) |
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goto unknown; |
137 |
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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: |
142 |
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goto unknown; |
143 |
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} |
144 |
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break; |
145 |
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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: |
150 |
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syntax(fname, lineno, "Too few vertices"); |
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break; |
152 |
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case 3: |
153 |
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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; |
156 |
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case 4: |
157 |
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if (!putquad(argv[1], argv[2], |
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argv[3], argv[4])) |
159 |
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syntax(fname, lineno, "Bad quad"); |
160 |
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break; |
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default: |
162 |
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if (!putface(argc-1, argv+1)) |
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syntax(fname, lineno, "Bad face"); |
164 |
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break; |
165 |
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} |
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break; |
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case 'u': |
168 |
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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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printf("# Done processing file: %s\n", fname); |
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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 ( ; ; ) { |
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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'; |
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} |
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if (!*cp || i >= MAXARG-1) |
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break; |
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av[i++] = cp; |
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while (*++cp && !isspace(*cp)) |
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; |
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} |
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av[i] = NULL; |
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lineno++; |
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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++ == '/') |
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break; |
270 |
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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++ == '/') |
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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 |
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322 |
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
323 |
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return(0); |
324 |
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/* compute barycentric coordinates */ |
325 |
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if ((v1i[2]>=0&&v2i[2]>=0&&v3i[2]>=0) || |
326 |
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(v1i[1]>=0&&v2i[1]>=0&&v3i[1]>=0)) |
327 |
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if (comp_baryc(bvecs, vlist[v1i[0]], vlist[v2i[0]], |
328 |
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vlist[v3i[0]]) < 0) |
329 |
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return(0); |
330 |
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/* put out texture (if any) */ |
331 |
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if (v1i[2]>=0 && v2i[2]>=0 && v3i[2]>=0) { |
332 |
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printf("\n%s texfunc %s\n", mod, TEXNAME); |
333 |
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mod = TEXNAME; |
334 |
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printf("4 dx dy dz %s\n", TCALNAME); |
335 |
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printf("0\n21\n"); |
336 |
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put_baryc(bvecs); |
337 |
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printf("\t%14.12g %14.12g %14.12g\n", |
338 |
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vnlist[v1i[2]][0], vnlist[v2i[2]][0], |
339 |
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vnlist[v3i[2]][0]); |
340 |
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printf("\t%14.12g %14.12g %14.12g\n", |
341 |
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vnlist[v1i[2]][1], vnlist[v2i[2]][1], |
342 |
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vnlist[v3i[2]][1]); |
343 |
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printf("\t%14.12g %14.12g %14.12g\n", |
344 |
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vnlist[v1i[2]][2], vnlist[v2i[2]][2], |
345 |
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vnlist[v3i[2]][2]); |
346 |
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} |
347 |
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/* put out pattern (if any) */ |
348 |
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if (picfile[0] && v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0) { |
349 |
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printf("\n%s colorpict %s\n", mod, PATNAME); |
350 |
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mod = PATNAME; |
351 |
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printf("7 noneg noneg noneg %s %s u v\n", picfile, TCALNAME); |
352 |
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printf("0\n18\n"); |
353 |
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put_baryc(bvecs); |
354 |
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printf("\t%f %f %f\n", vtlist[v1i[1]][0], |
355 |
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vtlist[v2i[1]][0], vtlist[v3i[1]][0]); |
356 |
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printf("\t%f %f %f\n", vtlist[v1i[1]][1], |
357 |
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vtlist[v2i[1]][1], vtlist[v3i[1]][1]); |
358 |
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} |
359 |
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/* put out triangle */ |
360 |
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printf("\n%s polygon %s.%d\n", matname, objname, ++nfaces); |
361 |
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printf("0\n0\n9\n"); |
362 |
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pvect(vlist[v1i[0]]); |
363 |
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pvect(vlist[v2i[0]]); |
364 |
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pvect(vlist[v3i[0]]); |
365 |
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366 |
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return(1); |
367 |
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} |
368 |
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369 |
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370 |
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int |
371 |
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comp_baryc(bcm, v1, v2, v3) /* compute barycentric vectors */ |
372 |
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register BARYCCM bcm; |
373 |
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FLOAT *v1, *v2, *v3; |
374 |
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{ |
375 |
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FLOAT *vt; |
376 |
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FVECT va, vab, vcb; |
377 |
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double d; |
378 |
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register int i, j; |
379 |
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380 |
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for (j = 0; j < 3; j++) { |
381 |
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for (i = 0; i < 3; i++) { |
382 |
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vab[i] = v1[i] - v2[i]; |
383 |
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vcb[i] = v3[i] - v2[i]; |
384 |
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} |
385 |
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d = DOT(vcb,vcb); |
386 |
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if (d <= FTINY) |
387 |
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return(-1); |
388 |
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d = DOT(vcb,vab)/d; |
389 |
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for (i = 0; i < 3; i++) |
390 |
|
|
va[i] = vab[i] - vcb[i]*d; |
391 |
|
|
d = DOT(va,va); |
392 |
|
|
if (d <= FTINY) |
393 |
|
|
return(-1); |
394 |
|
|
for (i = 0; i < 3; i++) { |
395 |
|
|
va[i] /= d; |
396 |
|
|
bcm[j][i] = va[i]; |
397 |
|
|
} |
398 |
|
|
bcm[j][3] = -DOT(v2,va); |
399 |
|
|
/* rotate vertices */ |
400 |
|
|
vt = v1; |
401 |
|
|
v1 = v2; |
402 |
|
|
v2 = v3; |
403 |
|
|
v3 = vt; |
404 |
|
|
} |
405 |
|
|
return(0); |
406 |
|
|
} |
407 |
|
|
|
408 |
|
|
|
409 |
|
|
put_baryc(bcm) /* put barycentric coord. vectors */ |
410 |
|
|
register BARYCCM bcm; |
411 |
|
|
{ |
412 |
|
|
register int i; |
413 |
|
|
|
414 |
|
|
for (i = 0; i < 3; i++) |
415 |
|
|
printf("%14.8f %14.8f %14.8f %14.8f\n", |
416 |
|
|
bcm[i][0], bcm[i][1], bcm[i][2], bcm[i][3]); |
417 |
|
|
} |
418 |
|
|
|
419 |
|
|
|
420 |
|
|
putquad(p0, p1, p2, p3) /* put out a quadrilateral */ |
421 |
|
|
char *p0, *p1, *p2, *p3; |
422 |
|
|
{ |
423 |
|
|
VNDX p0i, p1i, p2i, p3i; |
424 |
|
|
FVECT norm[4]; |
425 |
|
|
int axis; |
426 |
|
|
FVECT v1, v2, vc1, vc2; |
427 |
|
|
int ok1, ok2; |
428 |
|
|
/* get actual indices */ |
429 |
|
|
if (!cvtndx(p0i,p0) || !cvtndx(p1i,p1) || |
430 |
|
|
!cvtndx(p2i,p2) || !cvtndx(p3i,p3)) |
431 |
|
|
return(0); |
432 |
|
|
/* compute exact normals */ |
433 |
|
|
fvsum(v1, vlist[p1i[0]], vlist[p0i[0]], -1.0); |
434 |
|
|
fvsum(v2, vlist[p2i[0]], vlist[p0i[0]], -1.0); |
435 |
|
|
fcross(vc1, v1, v2); |
436 |
|
|
ok1 = normalize(vc1) != 0.0; |
437 |
|
|
fvsum(v1, vlist[p2i[0]], vlist[p3i[0]], -1.0); |
438 |
|
|
fvsum(v2, vlist[p1i[0]], vlist[p3i[0]], -1.0); |
439 |
|
|
fcross(vc2, v1, v2); |
440 |
|
|
ok2 = normalize(vc2) != 0.0; |
441 |
|
|
if (!(ok1 | ok2)) |
442 |
|
|
return(0); |
443 |
|
|
/* compute normal interpolation */ |
444 |
|
|
axis = norminterp(norm, p0i, p1i, p2i, p3i); |
445 |
|
|
|
446 |
|
|
/* put out quadrilateral? */ |
447 |
|
|
if (ok1 & ok2 && fdot(vc1,vc2) >= 1.0-FTINY*FTINY) { |
448 |
|
|
printf("\n%s ", matname); |
449 |
|
|
if (axis != -1) { |
450 |
|
|
printf("texfunc %s\n", TEXNAME); |
451 |
|
|
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
452 |
|
|
printf("0\n13\t%d\n", axis); |
453 |
|
|
pvect(norm[0]); |
454 |
|
|
pvect(norm[1]); |
455 |
|
|
pvect(norm[2]); |
456 |
|
|
fvsum(v1, norm[3], vc1, -0.5); |
457 |
|
|
fvsum(v1, v1, vc2, -0.5); |
458 |
|
|
pvect(v1); |
459 |
|
|
printf("\n%s ", TEXNAME); |
460 |
|
|
} |
461 |
|
|
printf("polygon %s.%d\n", objname, ++nfaces); |
462 |
|
|
printf("0\n0\n12\n"); |
463 |
|
|
pvect(vlist[p0i[0]]); |
464 |
|
|
pvect(vlist[p1i[0]]); |
465 |
|
|
pvect(vlist[p3i[0]]); |
466 |
|
|
pvect(vlist[p2i[0]]); |
467 |
|
|
return(1); |
468 |
|
|
} |
469 |
|
|
/* put out triangles? */ |
470 |
|
|
if (ok1) { |
471 |
|
|
printf("\n%s ", matname); |
472 |
|
|
if (axis != -1) { |
473 |
|
|
printf("texfunc %s\n", TEXNAME); |
474 |
|
|
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
475 |
|
|
printf("0\n13\t%d\n", axis); |
476 |
|
|
pvect(norm[0]); |
477 |
|
|
pvect(norm[1]); |
478 |
|
|
pvect(norm[2]); |
479 |
|
|
fvsum(v1, norm[3], vc1, -1.0); |
480 |
|
|
pvect(v1); |
481 |
|
|
printf("\n%s ", TEXNAME); |
482 |
|
|
} |
483 |
|
|
printf("polygon %s.%d\n", objname, ++nfaces); |
484 |
|
|
printf("0\n0\n9\n"); |
485 |
|
|
pvect(vlist[p0i[0]]); |
486 |
|
|
pvect(vlist[p1i[0]]); |
487 |
|
|
pvect(vlist[p2i[0]]); |
488 |
|
|
} |
489 |
|
|
if (ok2) { |
490 |
|
|
printf("\n%s ", matname); |
491 |
|
|
if (axis != -1) { |
492 |
|
|
printf("texfunc %s\n", TEXNAME); |
493 |
|
|
printf("4 surf_dx surf_dy surf_dz %s\n", QCALNAME); |
494 |
|
|
printf("0\n13\t%d\n", axis); |
495 |
|
|
pvect(norm[0]); |
496 |
|
|
pvect(norm[1]); |
497 |
|
|
pvect(norm[2]); |
498 |
|
|
fvsum(v2, norm[3], vc2, -1.0); |
499 |
|
|
pvect(v2); |
500 |
|
|
printf("\n%s ", TEXNAME); |
501 |
|
|
} |
502 |
|
|
printf("polygon %s.%d\n", objname, ++nfaces); |
503 |
|
|
printf("0\n0\n9\n"); |
504 |
|
|
pvect(vlist[p2i[0]]); |
505 |
|
|
pvect(vlist[p1i[0]]); |
506 |
|
|
pvect(vlist[p3i[0]]); |
507 |
|
|
} |
508 |
|
|
return(1); |
509 |
|
|
} |
510 |
|
|
|
511 |
|
|
|
512 |
|
|
int |
513 |
|
|
norminterp(resmat, p0i, p1i, p2i, p3i) /* compute normal interpolation */ |
514 |
|
|
register FVECT resmat[4]; |
515 |
|
|
register VNDX p0i, p1i, p2i, p3i; |
516 |
|
|
{ |
517 |
|
|
#define u ((ax+1)%3) |
518 |
|
|
#define v ((ax+2)%3) |
519 |
|
|
|
520 |
|
|
register int ax; |
521 |
|
|
MAT4 eqnmat; |
522 |
|
|
FVECT v1; |
523 |
|
|
register int i, j; |
524 |
|
|
|
525 |
|
|
if (!(p0i[2]>=0 && p1i[2]>=0 && p2i[2]>=0 && p3i[2]>=0)) |
526 |
|
|
return(-1); |
527 |
|
|
/* find dominant axis */ |
528 |
|
|
VCOPY(v1, vnlist[p0i[2]]); |
529 |
|
|
fvsum(v1, v1, vnlist[p1i[2]], 1.0); |
530 |
|
|
fvsum(v1, v1, vnlist[p2i[2]], 1.0); |
531 |
|
|
fvsum(v1, v1, vnlist[p3i[2]], 1.0); |
532 |
|
|
ax = ABS(v1[0]) > ABS(v1[1]) ? 0 : 1; |
533 |
|
|
ax = ABS(v1[ax]) > ABS(v1[2]) ? ax : 2; |
534 |
|
|
/* assign equation matrix */ |
535 |
|
|
eqnmat[0][0] = vlist[p0i[0]][u]*vlist[p0i[0]][v]; |
536 |
|
|
eqnmat[0][1] = vlist[p0i[0]][u]; |
537 |
|
|
eqnmat[0][2] = vlist[p0i[0]][v]; |
538 |
|
|
eqnmat[0][3] = 1.0; |
539 |
|
|
eqnmat[1][0] = vlist[p1i[0]][u]*vlist[p1i[0]][v]; |
540 |
|
|
eqnmat[1][1] = vlist[p1i[0]][u]; |
541 |
|
|
eqnmat[1][2] = vlist[p1i[0]][v]; |
542 |
|
|
eqnmat[1][3] = 1.0; |
543 |
|
|
eqnmat[2][0] = vlist[p2i[0]][u]*vlist[p2i[0]][v]; |
544 |
|
|
eqnmat[2][1] = vlist[p2i[0]][u]; |
545 |
|
|
eqnmat[2][2] = vlist[p2i[0]][v]; |
546 |
|
|
eqnmat[2][3] = 1.0; |
547 |
|
|
eqnmat[3][0] = vlist[p3i[0]][u]*vlist[p3i[0]][v]; |
548 |
|
|
eqnmat[3][1] = vlist[p3i[0]][u]; |
549 |
|
|
eqnmat[3][2] = vlist[p3i[0]][v]; |
550 |
|
|
eqnmat[3][3] = 1.0; |
551 |
|
|
/* invert matrix (solve system) */ |
552 |
|
|
if (!invmat4(eqnmat, eqnmat)) |
553 |
|
|
return(-1); /* no solution */ |
554 |
|
|
/* compute result matrix */ |
555 |
|
|
for (j = 0; j < 4; j++) |
556 |
|
|
for (i = 0; i < 3; i++) |
557 |
|
|
resmat[j][i] = eqnmat[j][0]*vnlist[p0i[2]][i] + |
558 |
|
|
eqnmat[j][1]*vnlist[p1i[2]][i] + |
559 |
|
|
eqnmat[j][2]*vnlist[p2i[2]][i] + |
560 |
|
|
eqnmat[j][3]*vnlist[p3i[2]][i]; |
561 |
|
|
return(ax); |
562 |
|
|
|
563 |
|
|
#undef u |
564 |
|
|
#undef v |
565 |
|
|
} |
566 |
|
|
|
567 |
|
|
|
568 |
|
|
freeverts() /* free all vertices */ |
569 |
|
|
{ |
570 |
|
|
if (nvs) { |
571 |
|
|
free((char *)vlist); |
572 |
|
|
nvs = 0; |
573 |
|
|
} |
574 |
|
|
if (nvts) { |
575 |
|
|
free((char *)vtlist); |
576 |
|
|
nvts = 0; |
577 |
|
|
} |
578 |
|
|
if (nvns) { |
579 |
|
|
free((char *)vnlist); |
580 |
|
|
nvns = 0; |
581 |
|
|
} |
582 |
|
|
} |
583 |
|
|
|
584 |
|
|
|
585 |
|
|
int |
586 |
|
|
newv(x, y, z) /* create a new vertex */ |
587 |
|
|
double x, y, z; |
588 |
|
|
{ |
589 |
|
|
if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
590 |
|
|
if (nvs == 0) |
591 |
|
|
vlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
592 |
|
|
else |
593 |
|
|
vlist = (FVECT *)realloc((char *)vlist, |
594 |
|
|
(nvs+CHUNKSIZ)*sizeof(FVECT)); |
595 |
|
|
if (vlist == NULL) { |
596 |
|
|
fprintf(stderr, |
597 |
|
|
"Out of memory while allocating vertex %d\n", nvs); |
598 |
|
|
exit(1); |
599 |
|
|
} |
600 |
|
|
} |
601 |
|
|
/* assign new vertex */ |
602 |
|
|
vlist[nvs][0] = x; |
603 |
|
|
vlist[nvs][1] = y; |
604 |
|
|
vlist[nvs][2] = z; |
605 |
|
|
return(++nvs); |
606 |
|
|
} |
607 |
|
|
|
608 |
|
|
|
609 |
|
|
int |
610 |
|
|
newvn(x, y, z) /* create a new vertex normal */ |
611 |
|
|
double x, y, z; |
612 |
|
|
{ |
613 |
|
|
if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
614 |
|
|
if (nvns == 0) |
615 |
|
|
vnlist = (FVECT *)malloc(CHUNKSIZ*sizeof(FVECT)); |
616 |
|
|
else |
617 |
|
|
vnlist = (FVECT *)realloc((char *)vnlist, |
618 |
|
|
(nvns+CHUNKSIZ)*sizeof(FVECT)); |
619 |
|
|
if (vnlist == NULL) { |
620 |
|
|
fprintf(stderr, |
621 |
|
|
"Out of memory while allocating normal %d\n", nvns); |
622 |
|
|
exit(1); |
623 |
|
|
} |
624 |
|
|
} |
625 |
|
|
/* assign new normal */ |
626 |
|
|
vnlist[nvns][0] = x; |
627 |
|
|
vnlist[nvns][1] = y; |
628 |
|
|
vnlist[nvns][2] = z; |
629 |
|
|
if (normalize(vnlist[nvns]) == 0.0) |
630 |
|
|
return(0); |
631 |
|
|
return(++nvns); |
632 |
|
|
} |
633 |
|
|
|
634 |
|
|
|
635 |
|
|
int |
636 |
|
|
newvt(x, y) /* create a new texture vertex */ |
637 |
|
|
double x, y; |
638 |
|
|
{ |
639 |
|
|
if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
640 |
|
|
if (nvts == 0) |
641 |
|
|
vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
642 |
|
|
else |
643 |
|
|
vtlist = (FLOAT (*)[2])realloc((char *)vtlist, |
644 |
|
|
(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
645 |
|
|
if (vtlist == NULL) { |
646 |
|
|
fprintf(stderr, |
647 |
|
|
"Out of memory while allocating texture vertex %d\n", |
648 |
|
|
nvts); |
649 |
|
|
exit(1); |
650 |
|
|
} |
651 |
|
|
} |
652 |
|
|
/* assign new texture vertex */ |
653 |
|
|
vtlist[nvts][0] = x; |
654 |
|
|
vtlist[nvts][1] = y; |
655 |
|
|
return(++nvts); |
656 |
|
|
} |
657 |
|
|
|
658 |
|
|
|
659 |
|
|
syntax(fn, ln, er) /* report syntax error and exit */ |
660 |
|
|
char *fn; |
661 |
|
|
int ln; |
662 |
|
|
char *er; |
663 |
|
|
{ |
664 |
|
|
fprintf(stderr, "%s: Wavefront syntax error near line %d: %s\n", |
665 |
|
|
fn, ln, er); |
666 |
|
|
exit(1); |
667 |
|
|
} |