TriangleMesh.cpp

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/**
 *\file         TriangleMesh.cpp
 *
 *\brief        
 *
 *\author       Xianming Chen
 *
 *\date         11 Jul 2004
 */


#include "TriangleMesh.h"
#include <fstream>
#include <iostream>

using namespace std;


namespace columbia
{

  static bool skip_comment_line(istream& is, char comment_tag)
  {
    char next;
    while( is >> skipws >> next ) 
    {
      is.putback(next);

      if(next == comment_tag)
      {
        while( is >> noskipws >> next && next != '\n' );
      }
      else
        return true;
    }
    return false;
  }


  TriangleMesh :: TriangleMesh(const char* obj_fname)
  {
    float x, y, z;
    int i, j, k;
    
    ifstream is(obj_fname);

    if(is)
    {
      V.push_back( Vertex() );                           // the 0'th vertex is ignored.
      while( skip_comment_line(is, '#') ) 
      {
        char type;
        if( ! (is >> type) ) break;

        if(type == 'v')
        {
          is >> x >> y >> z;
          //      cout << x << " " << y <<  " " << z << endl;
          
          V.push_back( Vertex(4200 * x, 4200 * y, 4200 * z) );
        }
        else if(type == 'f')
        {
          is >> i >> j >> k;
          F.push_back( TriangleFace(i,j,k) );
        }
      }
      total_triangles = F.size();
      is.close();
    }
    else 
      cerr << "Can't open input file " << obj_fname << endl;
  }
};

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