pastebin - collaborative debugging

Cylinder::Cylinder(int n, int m) : Shape() {
  if (n < 3)
    n = 3;

  //n is the tessellation factor of the cylinder itself
  //m is the tessellation factor on the sides

  double x1,y1,z1,x2,y2,z2;
  x1 = -0.5;
  x2 = 0.5;
  y1 = -0.5;
  y2 = 0.5;
  z1 = .5;
  z2 = -.5;

  Point3 fixedPT( 0, y2, 0 );
  Point3 fixedPB( 0, y1, 0 );
  vector<Point3> circumPoints; //vector to hold circumference points

  //begin with the top and bottom
  //while n > 0, add points to the circumference and try triangles
  float angle = 360/n; //get the angle interval

  for( double i = 0; i < 360; i+=angle ) {

    double px = .5*cos( i * (PI/180) );
    double pz = .5*sin( i * (PI/180) );

    Point3 circP( px, y2, pz );
    circumPoints.push_back(circP);

  }


  //iterate through to make the top and the bottom
  for( int i = 0; i < n; i++ ) {

    int t = i;

    Point3 p1 = circumPoints.at(t);
    if( t+1 == n )
      t = -1;
    Point3 p2 = circumPoints.at(t+1);

    addTriangle( p2, p1, fixedPT );

    p1.y = y1;
    p2.y = y1;

    addTriangle( p1, p2, fixedPB );

  }

  //for each circumference point and the next circumference point
  //draw squares all the way down
  float fy = m-1;
  for( int x = 0; x < n; x++ ) { //number of faces

    int t = x;
    //grab the first 2 circumference points
    Point3 p1 = circumPoints.at(t);
    if(t+1 == n) {
      t = -1; //go back to the beginning of the vector
    }
    Point3 p2 = circumPoints.at(t+1);
    Point3 p3 = p2;
    Point3 temp = p2;
    p3.y = y1;

    for( int i = 0; i < m; i++ ) {
      float facty = fy/m;
      float npy = (1-facty)*p3.y + facty*p2.y;

      Point3 lowR( p1.x, npy, p1.z );
      Point3 midP( temp.x, npy, temp.z );

      addSquare( p1, temp, midP, lowR );

      p1 = lowR;
      temp = midP;
      fy--;
    }
    fy = m-1;
  }

}