cam_pos      = [-0.915384, 1.56885, -1.00674]';
cam_dir      = [-0.378683, 0.235868, 0.894966]';
cam_up       = [-0.0431482, 0.961431, -0.271642]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.22961, 0.188172, 0.470687]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;