Hi Steven,
We have chosen to use the full 3D representations even when doing 2D
processing so that we don't write a 2d and a 3D version of every tool. So we
just fill in zero the non planar values.

Tully

On Thu, Dec 2, 2010 at 9:22 AM, Steven Bellens <
steven.bellens@mech.kuleuven.be> wrote:

> Hi,
>
> I'm looking for a message to represent a velocity in a plane (x, y,
> theta). Is there any existing message dedicated for this already? Or
> is it most common to use the geometry_msgs/Twist and leave blank the
> irrelevant variables?
>
> regards,
>
> Steven
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-- 
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827