cam_pos      = [0.179221, 1.43293, 0.762478]';
cam_dir      = [0.968163, 0.0033414, -0.250298]';
cam_up       = [-0.23821, 0.319545, -0.917141]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.1023, -1.26026, -0.412522]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;