cam_pos      = [-0.202284, 1.53869, 0.843711]';
cam_dir      = [-0.861456, 0.185603, 0.4727]';
cam_up       = [-0.255242, 0.646459, -0.718986]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.583907, 0.984237, 0.677664]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;