Christian,

Take a look at this thread:
http://ros-users.122217.n3.nabble.com/Costmap2D-Inflation-Radius-Maximum-td842808.html

Basically, RVIZ only draws up to the inscribed radius of the robot, which is
independent of the inflation radius.

- Eric

On Mon, Sep 6, 2010 at 12:45 PM, Christian Verbeek <
verbeek@servicerobotics.eu> wrote:

>  I found that if I use an inflation_radius > 0.55 (the default in in
> costmap_2d) the inflated obstacles are displayed in rviz as if I used 0.55.
>
> I set the inflation_radius to 1 and see no difference in rviz compared
> to 0.55. The robots behaviour seems to honour the 1.
>
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