flightgear/Tri2obj/tri2obj.c

/* tri2obj.c -- read in a .ele/.node file pair generated by the triangle 
 *              program and output a simple Wavefront .obj file.
 *
 * Written by Curtis Olson, started October 1997.
 *
 * Copyright (C) 1997  Curtis L. Olson  - curt@infoplane.com
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 * (Log is kept at end of this file)
 */


#include <stdio.h>
#include <string.h>

#include "tri2obj.h"


int nodecount, tricount;
double nodes[MAX_NODES][3];
int tris[MAX_TRIS][3];
int new_tris[MAX_TRIS][3];


/* Initialize a new mesh structure */
void triload(char *basename) {
    char nodename[256], elename[256];
    FILE *node, *ele;
    int dim, junk1, junk2;
    int i;

    strcpy(nodename, basename);
    strcat(nodename, ".node");
    strcpy(elename, basename);
    strcat(elename, ".ele");

    printf("Loading node file:  %s ...\n", nodename);
    if ( (node = fopen(nodename, "r")) == NULL ) {
	printf("Cannot open file '%s'\n", nodename);
	exit(-1);
    }

    fscanf(node, "%d %d %d %d", &nodecount, &dim, &junk1, &junk2);

    if ( nodecount > MAX_NODES - 1 ) {
	printf("Error, too many nodes, need to increase array size\n");
	exit(-1);
    } else {
	printf("    Expecting %d nodes\n", nodecount);
    }

    for ( i = 1; i <= nodecount; i++ ) {
	fscanf(node, "%d %lf %lf %lf %d\n", &junk1, 
	       &nodes[i][0], &nodes[i][1], &nodes[i][2], &junk2);
	/* printf("%d %.2f %.2f %.2f\n", 
	       junk1, nodes[i][0], nodes[i][1], nodes[i][2]); */
    }

    fclose(node);

    printf("Loading element file:  %s ...\n", elename);
    if ( (ele = fopen(elename, "r")) == NULL ) {
	printf("Cannot open file '%s'\n", elename);
	exit(-1);
    }

    fscanf(ele, "%d %d %d", &tricount, &junk1, &junk2);

    if ( tricount > MAX_TRIS - 1 ) {
	printf("Error, too many elements, need to increase array size\n");
	exit(-1);
    } else {
	printf("    Expecting %d elements\n", tricount);
    }

    for ( i = 1; i <= tricount; i++ ) {
	fscanf(ele, "%d %d %d %d\n", &junk1, 
	       &tris[i][0], &tris[i][1], &tris[i][2]);
	/* printf("%d %d %d %d\n", junk1, tris[i][0], tris[i][1], tris[i][2]);*/
    }

    fclose(ele);
}


/* dump in WaveFront .obj format */
void dump_obj(char *basename) {
    char objname[256];
    FILE *obj;
    int i;

    strcpy(objname, basename);
    strcat(objname, ".obj");

    printf("Dumping to file:  %s ...\n", objname);

    obj = fopen(objname, "w");

    /* dump vertices */
    for ( i = 1; i <= nodecount; i++ ) {
	fprintf(obj, "v %.2f %.2f %.2f\n", 
		nodes[i][0], nodes[i][1], nodes[i][2]);
    }

    /* dump faces */
    for ( i = 1; i <= tricount; i++ ) {
	fprintf(obj, "f %d %d %d\n", tris[i][0], tris[i][1], tris[i][2]);
    }

    fclose(obj);
}

int main(int argc, char **argv) {
    char basename[256];

    strcpy(basename, argv[1]);

    /* load the input data files */
    triload(basename);

    /* dump in WaveFront .obj format */
    dump_obj(basename);

    return(0);
}


/* $Log$
/* Revision 1.1  1997/10/29 23:05:15  curt
/* Initial revision.
/*
 */