Hi,
to visualize rays, add the following element inside the <sensor:ray> block,
  <displayRays>fan</displayRays>
I agree this information should exist somewhere.  I'll look for a location
to add appropriate documentations.
thanks,
John

2011/1/4 Nicolás Alvarez Picco <nicolasapicco@hotmail.com>

>  Hi everybody,
> I am testing this pkg, specifically the erratic pkg. What I am doing is
> just launching the launch file:
>  erratic_laser_wg_world.launch
> And I want to know how I can visualize in the gazebo the laser rays of the
> erratic model.
> Someone knows how to do that???
>
> Thanks in advanced
>
> Nicolas
>
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