cam_pos      = [-0.590222, 1.05844, 0.670759]';
cam_dir      = [0.99761, -0.0103313, -0.0683152]';
cam_up       = [0.00923428, 0.999824, -0.016355]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0910679, -0.0208612, -1.32671]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;