Setting robot orientation

edit

Hello all,

I have 2 robots erratic robots in gazebo and I want them to have approximately the same orientation. I am trying following piece of code but it doesn't seem to have any effect on my robot's rotation.

tf::TransformListener listener;
    tf::StampedTransform transform;
    try {

        listener.waitForTransform("/odom", "/base_link", ros::Time(0),
                ros::Duration(3.0));
        listener.lookupTransform("/odom", "/base_link", ros::Time(0),
                transform);
    } catch (tf::TransformException ex) {
        ROS_ERROR("%s", ex.what());
    }

    tf::Quaternion rotation;
    rotation.setValue(robot2.orientation.x, robot2.orientation.y, robot2.orientation.z);
    transform.setRotation(rotation);