Assigning namespaces for topics from Kinect (Turtlebot)

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Hi,

I am doing a simulation with 2 Turtlebots in Gazebo (using ROS Fuerte). I used different namespaces (turtle1 and turtle2) for each robot in order to get their respective data. However, I noticed that some of the topics (topics with Kinect info) did not change their names. For instance after using this snippet:

<group ns="turtle2">
  <include file="$(find tortuninja)/launch/turtlebotNodes.launch" >
    <arg  name="model_name" value="turtle2" /> 
    <arg name="x" value = "-2.0" />
  </include>
</group>

Topics like /imu/data would become accordingly /turtle2/imu/data. But for others like /camera/depth/points I would still get /camera/depth/points.

I fixed the problem by editing the file ($find turtlebot_description)/urdf/gazebo.urdf.xacro . I changed the global topic names like /camera/depth/points to local ones camera/depth/points. After doing that I was able to get the corresponding namespace in front (and get info from both Kinects).

My question is: Is this the right approach? Or is there any other way to change the namespace for Kinect-topics in Turtlebot other than editing the gazebo.urdf.xacro file?

Thanks!

Ana