cam_pos      = [0.298575, 0.835902, 0.333989]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.566343, 0.566583, 0.598531]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0411551, 0.945754, -0.934215]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;