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HELP: adding logical_camera sensor to my robot causes strange effect!

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Hi all, I'm using gazebo 7 to simulate a differential drive robot. Following the [ROS tutorials](http://wiki.ros.org/urdf/Tutorials) online, I created an urdf file to describe my robot: - https://github.com/schizzz8/lucrezio_description/blob/master/urdf/lucrezio.urdf.xacro If I launch an empty world: roslaunch gazebo_ros empty_world.launch and then I spawn the robot with this launch file: - https://github.com/schizzz8/lucrezio_description/blob/master/launch/robot.launch everything goes fine. ![image description](/upfiles/15124812858335568.png) Now, I wrote a simple plugin for the [logical_camera](http://gazebosim.org/tutorials?tut=logical_camera_sensor&cat=sensors&branch=logical_camera) sensor: - https://github.com/schizzz8/lucrezio_logical_camera and I try to mount it on the robot by adding these lines to the urdf: 0.025.0${60.0*M_PI/180.0}1.778truetrue10 If I now spawn the robot, this is what happens: - https://youtu.be/9duCT1FotSI Basically, it seems that the ground plane gets shifted up of one meter. Can please someone explain me what is happening? Thanks.

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