anyway compiz was not a necessity. and awaiting reply for my previous
query(reposted below) 
> as i move the robot as per this tutorial
> http://www.ros.org/wiki/simulator_stage/Tutorials/SimulatingOneRobot
> SimulatingOneRobot 
> in the rviz the past images gets erased as new places are discovered. is
> this normal. i hope u understand what i mean.
> when the robot starts from point say "A" and it moves and discovers more
> and
> more places in the map the previous places that it had already
> discovered(in
> rviz) gets erased. i think its due to limited buffer. 
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