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Thanks for the answer but the problem is not about the display of Rviz because the topic give me the maximum distance of the sensors even in front of the wall. I know it is not a perfect cone but a pyramid must works very well in my case too. The return of value was wrong in the lower mid of the "cone" in the simulation. If I turn the sensor 90 degrees roll, the lecture in the vertical axis becomes good but not in the horizontal axis. Maybe the follow video let me explain better:

http://youtu.be/TFzbeP9kOv4