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local costmap empty in ros navigation

Hi everyone,

I have a Kinect on a mobile robot, where I use the package pointcloud_to_laserscan to publish a fake laser in the topic /scan for the navigation stack. The problem is that I am not able to see any obstacle in the local costmap. I have tried all the solutions, checking the maximum and minimum obstacle range, etc. When I do rostopic info /scan, I see the following subscritions:

 * /rviz (
 * /amcl (

Should I see any other node subscribed to this topic, like the move_base node? May be this the problem? I am quite lost, so any help would be really appreciated! The .yam configuration files about the navigation are just the same as described in the tutorial.