Hi Anton,
I can confirm there is a bug in collada collision mesh initialization.  While this is being debugged, I've checked an update into trunk for now that use uses stl for collision.
https://kforge.ros.org/gazebo/trac/ticket/45
Thanks,
John

On Mon, Mar 12, 2012 at 2:00 PM, Antons Rebguns <arebgun@gmail.com> wrote:
Hello folks,

I in the process of updating the erratic_robot stack for ROS Fuerte
and I have one problem that I am not sure how to solve. When I spawn a
robot (an Erratic or PR2) in WG environment the lasers don't see any
walls, and in fact you can just drive through walls as if they are not
there.

Here's the launch file I am using:

<launch>
   <param name="/use_sim_time" value="true" />

   <node name="empty_world_server"
         pkg="gazebo"
         type="gazebo"
         args="-u $(find gazebo_worlds)/worlds/wg_collada.world"
         respawn="false"
         output="screen"/>

   <node name="gazebo_gui" pkg="gazebo" type="gui" respawn="false"
output="screen"/>

   <include file="$(find
erratic_description)/launch/erratic_mobile_base.launch" />
</launch>

The last line can be changed to launch a PR2 robot instead, but I got
the same results.

Am I missing a step?

Thanks,
Anton
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John Hsu, Ph.D.
Senior Research Engineer
Willow Garage Inc.
+1-650-475-2809