cam_pos      = [0.200596, 0.748457, -0.344509]';
cam_dir      = [0.937538, 0.0162221, 0.347505]';
cam_up       = [-0.34536, -0.0766805, 0.935332]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0556205, 1.32591, 0.0881636]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;