cam_pos      = [-1.02638, 1.59743, 1.1422]';
cam_dir      = [0.908069, 0.103536, 0.405822]';
cam_up       = [0.054248, 0.931724, -0.359093]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.55234, -0.462968, -1.1178]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;