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is there any distance measuring sensor in gazebo ?

I m beginner in gazebo and robotics .is there any sensor in gazebo by which i find the distance of object ,i used Hokuyo laser range finders which is given in tutorial http://gazebosim.org/wiki/Tutorials/1.3/control_robot/mobile_base_laser .as far i understood it send a broad laser so it detect any object in that area(circumference ) ,but how can i know in which direction obstacle is present and how can i navigate my robot to avoid obstacle .