Hi Aaron,
If you are not publishing tf messages you need to make sure the fixed_frame
and target_frame in rviz are set to the frame in which you are publishing
thes scans.  In the case of the 2nd tutorial you linked to it should be
"laser_frame"

Also in the LaserScan display there is an error field with information if it
cannot display anything.  This should tell you why rviz cannot update the
display.  If you're still having trouble please send that message in your
reply.

Tully

On Thu, Oct 28, 2010 at 7:21 AM, Aaron Martinez Romero <
aaronmartinezromero@gmail.com> wrote:

> but...  can I display directly in rviz a "sensor_msgs/LaserScan" message
> ??  or I need too the "/tf [tf/tfMessage]"
>
> because in the tutorial of
> *
>
> http://www.ros.org/wiki/laser_pipeline/Tutorials/IntroductionToWorkingWithLaserScannerData#Visualizing_Your_Laser_Scan,
> *
>
> I can display the data in rviz without problem (using laser.bag -->
> http://vault.willowgarage.com/wgdata1/vol1/wiki_docs/laser_pipeline/laser.bag).
>
> But with the code of this example
>    "*
> http://www.ros.org/wiki/navigation/Tutorials/RobotSetup/Sensors#Writing_Code_to_Publish_a_LaserScan_Message
> *",
>
> I have problems to display the fake data generated by this code.
>
> Why????
>
> Best regards.
>
>
> 2010/10/27 Dan Lazewatsky <lazewatskyd@cse.wustl.edu>
>
>> There's a section in the tutorial "Introduction to Working With Laser
>> Scanner Data" that covers this:
>> http://www.ros.org/wiki/laser_pipeline/Tutorials/IntroductionToWorkingWithLaserScannerData#Visualizing_Your_Laser_Scan
>>
>> -Dan
>>
>> On Wed, Oct 27, 2010 at 9:51 AM, Aaron Martinez Romero <
>> aaronmartinezromero@gmail.com> wrote:
>>
>>> Hello,
>>>
>>> I am with this example, and I want to show the fake data in rviz, but I
>>> don't know how can do it.
>>>
>>> http://www.ros.org/wiki/navigation/Tutorials/RobotSetu<a href="p/S<http://www.ros.org/wiki/navigation/Tutorials/RobotSetup/Sensors>
>>> ensors <http://www.ros.org/wiki/navigation/Tutorials/RobotSetup/Sensors>
>>> <a href="
>>>
>>> I am trying display the data, because later I will try to write a new
>>> driver for a old Laser hardware (PLS200-214)
>>>
>>> Thanks.
>>> Best regards...
>>> --
>>> Atentamente,
>>> Aarón Martínez Romero
>>> Ingeniero en Informática
>>> Tlf: 600 283 349
>>> http://www.AaronMR.com
>>>
>>> _______________________________________________
>>> ros-users mailing list
>>> ros-users@code.ros.org
>>> https://code.ros.org/mailman/listinfo/ros-users
>>>
>>>
>>
>> _______________________________________________
>> ros-users mailing list
>> ros-users@code.ros.org
>> https://code.ros.org/mailman/listinfo/ros-users
>>
>>
>
>
> --
> Atentamente,
> Aarón Martínez Romero
> Ingeniero en Informática
> Tlf: 600 283 349
> http://www.AaronMR.com
>
> _______________________________________________
> ros-users mailing list
> ros-users@code.ros.org
> https://code.ros.org/mailman/listinfo/ros-users
>
>


-- 
Tully Foote
Systems Engineer
Willow Garage, Inc.
tfoote@willowgarage.com
(650) 475-2827