cam_pos      = [0.0586777, 1.16562, -0.68235]';
cam_dir      = [-0.873548, -0.339053, 0.349223]';
cam_up       = [-0.311409, 0.940728, 0.134374]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.49753, -0.0114789, 1.23338]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;