cam_pos      = [-0.263024, 0.522842, 1.41112]';
cam_dir      = [0.880245, 0.464294, -0.0979795]';
cam_up       = [-0.382284, 0.816189, 0.433236]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.373888, 0.457384, -1.1916]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;