[PlayerStage-Gazebo] how to create immovable objects

[Valentino <pun...@gm...>]

Hi!
I need  to create immovable objects like colored walls in my gazebo world. I
don't think that gzbuilder utility can help me because i need  these walls
must be colored.
I have tried to create a simple solid but when robot bump against it, the
solid  "fly"  in the  world.
I have also tried to set solid's mass and solid's friction but even if it's
more stationary, it always move in the world.
Thanks in advance for answer