Armin, thanks you very much for those explanation. I will explore the documentation and come back to you if I find problems. Raph -- View this message in context: http://ros-users.122217.n3.nabble.com/weirdnesses-in-octomap-impossible-to-build-collision-octomap-tp2241361p2248445.html Sent from the ROS-Users mailing list archive at Nabble.com.