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/*
* obj2model.c
*
* Turn Wavefront OBJ files into Thrust3D models
*
* (c) 2008 Thomas White <taw27@cam.ac.uk>
*
* thrust3d - a silly game
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "utils.c"
#define MAX_VERTICES 65536
int main(int argc, char *argv[]) {
FILE *fh;
FILE *out;
float vtmp[3*MAX_VERTICES];
float vntmp[3*MAX_VERTICES];
int n_vtmp, n_vntmp;
int nprev;
fh = fopen(argv[1], "r");
if ( fh == NULL ) {
fprintf(stderr, "Couldn't open '%s'\n", argv[1]);
return 1;
}
/* Zip through and find all the vertices */
n_vtmp = 0;
n_vntmp = 0;
while ( !feof(fh) ) {
char line[1024];
float x, y, z;
size_t s;
fgets(line, 1023, fh);
s = 0;
for ( ; s<strlen(line); s++ ) {
if ( line[s] != ' ' ) break;
}
if ( line[s] == '#' ) {
continue;
}
if ( sscanf(line+s, "v %f %f %f\n", &x, &y, &z) == 3 ) {
vtmp[3*n_vtmp+0] = x;
vtmp[3*n_vtmp+1] = y;
vtmp[3*n_vtmp+2] = z;
n_vtmp++;
continue;
}
if ( sscanf(line+s, "vn %f %f %f\n", &x, &y, &z) == 3 ) {
vntmp[3*n_vntmp+0] = x;
vntmp[3*n_vntmp+1] = y;
vntmp[3*n_vntmp+2] = z;
n_vntmp++;
continue;
}
}
/* Go through again and look for faces */
rewind(fh);
out = fopen(argv[2], "w");
fprintf(out, "# %s\n", argv[1]);
fprintf(out, "\n");
nprev = 0;
while ( !feof(fh) ) {
char line[1024];
char **bits;
int n, i;
fgets(line, 1023, fh);
n = assplode(line, " \t\r\n", &bits, ASSPLODE_NONE);
/* Read in a face */
if ( strcmp(bits[0], "f") == 0 ) {
int nthis;
nthis = n-1;
if ( nthis != nprev ) {
if ( nprev != 0 ) fprintf(out, "\n");
if ( nthis == 4 ) {
fprintf(out, "QUADS\n");
} else {
fprintf(out, "POLYGONS\n");
}
nprev = nthis;
} else {
fprintf(out, "#\n");
}
for ( i=1; i<n; i++ ) {
char **sp;
int np, nnum, j, nslash;
nslash = 0;
for ( j=0; j<strlen(bits[i]); j++ ) {
if ( bits[i][j] == '/' ) nslash++;
}
if ( nslash == 2 ) {
int vnum;
np = assplode(bits[i], "/", &sp, ASSPLODE_DUPS);
if ( np != 3 ) {
continue;
}
vnum = atoi(sp[0])-1;
nnum = atoi(sp[2])-1;
if ( vnum >= n_vtmp ) {
fprintf(stderr, "Vertex index is too high (%i/%i)\n", vnum, n_vtmp);
continue;
}
if ( nnum >= n_vntmp ) {
fprintf(stderr, "Normal index is too high (%i/%i)\n", nnum, n_vntmp);
continue;
}
fprintf(out, "%+8.3f %+8.3f %+8.3f\n", vtmp[3*vnum+0], vtmp[3*vnum+1],
vtmp[3*vnum+2]);
free(sp[0]);
free(sp[1]);
free(sp[2]);
free(sp);
} else if ( nslash == 0 ) {
int vnum;
vnum = atoi(bits[i]);
fprintf(out, "%+8.3f %+8.3f %+8.3f\n", vtmp[3*vnum+0], vtmp[3*vnum+1],
vtmp[3*vnum+2]);
}
}
}
for ( i=0; i<n; i++ ) free(bits[i]);
free(bits);
}
fprintf(out, "\n");
fclose(fh);
fclose(out);
return 0;
}
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