I had similar problems with compiz and rviz (or openrave, glxgears, 
etc.). I found that if I opened a terminal and then ran "unset 
LIBGL_ALWAYS_INDIRECT", the flickering problems disappeared, allowing me 
to have both compiz and working 3d apps. Just a thought.

Peter

On 06/16/2010 08:37 PM, Narasimhan wrote:
> thanks i uninstalled compiz and reinstalled hardware drivers and everything
> is fine now. just 1 last doubt.
> 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.
>