I am following this tutorial [link](http://wiki.ros.org/turtlebot_gazebo/Tutorials/indigo/Explore%20the%20Gazebo%20world) to simulate turtlebot in gazebo. However, there are some problems with the laser scan and point cloud captured by the turtlebot. There are always a layer of red cloud in front of the turtlebot, even though there are nothing actually in front. [Photo1](http://www.comp.nus.edu.sg/~wangchao/turtlebot/turtlebot2.jpg) [Photo2](http://www.comp.nus.edu.sg/~wangchao/turtlebot/turtlebot1.jpg)
I am using Ubuntu 14.04 in parallels desktop on Mac. Is the problem caused by virtual machine?
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