cam_pos      = [0.0997367, 1.11642, 0.758811]';
cam_dir      = [0.592076, 0.337835, -0.731651]';
cam_up       = [-0.773922, -0.0147823, -0.633109]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.298854, -1.25165, -0.336099]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;