Dear ,
I start finding about player/stage, i'm new about it. pls advise if any.
I'm doing the map building using laser 2D. i have something i do not clear about it. 
May you help me?
  1. do you have any method to build the map. pls advise me.
  2.  i'm trying to understand how lazer sensor work, i simulated , i showed some data from program but i'm not clear about these number: 
                    - Number lp[R]= -1610612736: is that the distance from robot to obstacle? is it meter or what? why we have negative number?
Now i'm doing: Map building for robot. thanks you very much.
i can not attached the showed that it is over 40kb

Quang Hai