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Simulation stops on spawn of 2D LIDAR ROS Melodic


I am trying to create an outdoor simulation using Gazebo heightmap and my urdf robot model. As soon as i spawn my model into my world ( the Gazebo Sim Time stops.

This can be recreated by starting the gazebo world and then spawning the 2D LIDAR in it

roslaunch gazebo_ros empty_world.launch empty_world.launch world_name:="<path_to_world>/"

roslaunch my_pkg sick.launch

sick.launch is a launchfile to spawn a LIDAR from the sick_scan repo.

When I do the same but with a flat style world everything works as expected.

Anybody got an Idea why this happens?

Thank you for your help

Gazebo Version 9.11.0 (I upgraded from 9.0 since I hoped this would eliminate my problems) Ubuntu 18.04 ROS Melodic