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     PLIB - A Suite of Portable Game Libraries
     Copyright (C) 1998,2002  Steve Baker
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     Library General Public License for more details.
     You should have received a copy of the GNU Library General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
     For further information visit http://plib.sourceforge.net

     $Id: ssgSaveOFF.cxx 1568 2002-09-02 06:05:49Z sjbaker $
 .off writer for SSG/PLIB
 Warning: There are two formats called OFF, see comment in ssgLoadOFF

 Written by Wolfram Kuss (Wolfram.Kuss@t-online.de) in February 2001

 We only support 2D and 3D data

#include <stdio.h>
#include "ssgLocal.h"
#include "ssgLoaderWriterStuff.h"

int ssgSaveOFF( const char* fname, ssgEntity *ent ) {
  FILE *fd = fopen ( fname, "w" ) ;
      int i;
  if ( fd == NULL ) {
    ulSetError ( UL_WARNING, "ssgSaveOFF: Failed to open '%s' for writing", 
             fname ); 
    return FALSE ;

  ssgVertexArray* vertices = new ssgVertexArray();
  ssgIndexArray*  indices  = new ssgIndexArray ();

  fprintf(fd, "# Model output by ssgSaveOFF. Original graph structure was:\n");
  ent->print(fd, "#", 0);

  sgMat4 ident;
  sgMakeIdentMat4( ident );
  ssgAccumVerticesAndFaces( ent, ident, vertices, indices, -1 );

      fprintf(fd, "nOFF\n3\n"); // 3 dimensions
      fprintf(fd, "%d %d 0\n", vertices->getNum(), indices->getNum()/3 );

  for (i = 0; i < vertices->getNum(); i++) {
    fprintf(fd, "%f %f %f\n", vertices->get(i)[0],

  for (i = 0; i < indices->getNum(); i += 3) {
    fprintf(fd, "3 %d %d %d\n", *indices->get(i    ) ,
                                                                                            *indices->get(i + 1) ,
                                                                                            *indices->get(i + 2) );

  fclose( fd ) ;

  delete vertices;
  delete indices ;
  return TRUE;

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