Hi Marc,

There are at least two ways to model the pan-tile camera.

You can create an urdf model similar to the head on the PR2 with just one
sensor and instantiate two controllers (probably joint_position_controllers)
from the robot_mechanism_controllers<http://ros.org/wiki/robot_mechanism_controllers>class,
and use the
pr2_controllers <http://ros.org/wiki/pr2_controllers> stack to send position
commands to your camera.  In that case, you can check out the single
actuated link simulation tutorial to
start.<http://www.ros.org/wiki/pr2_simulator/Tutorials/Pendulums>

Alternatively, gazebo has a built-in ptz controller, which you can use
directly and talk over the gazebo I-face, however, it should not be too much
additional effort to write a custom
gazebo_plugin<http://ros.org/wiki/gazebo_plugins>(see
GazeboRosTemplate plugin) to do the same over ros topic, service or action.

Let me know if this helps.
John


On Sat, Sep 25, 2010 at 4:20 AM, MightTower <marcjoeris@uni-koblenz.de>wrote:

>
> Hello,
> we need a Pan Tilt unit for a camera in our simulation using ROS and
> Gazebo.
> I read that there is no way to control/change joint position/orientation
> directly.
> What other possibilities we have to change the camera view dynamically?
> Is there something like a default pan tilt unit?
> Thanks
> Marc
> --
> View this message in context:
> http://ros-users.122217.n3.nabble.com/Pan-Tilt-Unit-in-Simulation-tp1578788p1578788.html
> Sent from the ROS-Users mailing list archive at Nabble.com.
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