w/h resizing with magic numbers

    });

    //var fov = w/h*self._FOV;

    // fixed ratio

    // default vertical FoV is 30 degs, we would like to fit in the window

    // the model w/h ratio is 2592/1904

    var fov = 1.8*self._FOV;

    var K_model = 2592/1904;

    var K_window = w/h;

    // window is really wide - fit the height

    if (K_window > K_model){

        fov = 1.8*self._FOV;

    }else{

        fov = (4.2-1.8*K_window)*self._FOV;

    }

    //fov = Math.PI/2;

    //console.log(fov);