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Can Robot Models for simulations be used in all ROS versions?

asked 2018-10-12 08:40:30 -0600

JerelVelarde gravatar image

I'm having trouble in simulating robots in gazebo as most models use ROS indigo in their documentaries as well as in Ros.org domentaries; basically all robots I've encountered so far.

Such as (fetch robot):

sudo apt-get install ros-indigo-fetch-gazebo-demo

which prints out this Error:

indigo-fetch-gazebo-demo

Reading package lists... Done

Building dependency tree

Reading state information... Done

E: Unable to locate package ros-indigo-fetch-gazebo-demo

so I tried just changing indigo to my current version (Melodic_

sudo apt-get install ros-melodic-fetch-gazebo-demo

but the same error prints out:

melodic-fetch-gazebo-demo

Reading package lists... Done Building

dependency tree Reading state

information... Done

E: Unable to locate package ros-melodic-fetch-gazebo-demo

Am I doing anything wrong?

or the model just hasn't been updated for melodic? (if so, what robot models are for melodic?)

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answered 2018-10-12 10:02:47 -0600

gvdhoorn gravatar image

The issue you are running into is not one of whether the simulation works, but whether the simulations have been released as debian (ie: .deb) packages for a specific OS and ROS release.

Seeing as you tagged this melodic, I'm going to assume you are running Ubuntu Bionic.

On a Bionic machine you cannot install packages built for ROS Indigo -- that version of ROS just isn't supported on Ubuntu Bionic (see REP-3).

And since fetch_gazebo_demo (the ROS package) has not been released for Melodic, trying to install it using apt-get will also not work: the debian package simply doesn't exist (see status_page/ros_melodic_default.html?q=fetch_).


Now as to the question of whether simulations (and I'm assuming Gazebo simulations here) created for ROS Indigo will work on ROS Melodic: the question is more subtle than that. ROS Indigo installed Gazebo 2.2 by default (see REP-3 again). ROS Melodic comes with Gazebo 9 (see REP-3).

There are quite a few changes between these two versions of Gazebo (and about 6 major versions), both in terms of the API and ABI as well as the dynamic behaviour of the simulator and the things that are simulated (Gazebo 9 has become a lot more realistic in its simulation than Gazebo 2 ever was).

So even while things (ie: plugins or Gazebo models) may work (ie: load) perhaps after fixing some incompatible things, the behaviour they exhibit in Gazebo 9 vs Gazebo 2 may be so different that we can no longer state that they "work".

Note that I'm not referring to the Fetch packages that you mention -- I don't know whether they work -- but wanted to address your question in general.

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Thanks, had a hint that thsi would be the issue. however I'm having issues with models for melodic; for example the fetch robot, I found this bot under the melodic robots category but in the documentations the instructions are all for indigo :(

JerelVelarde gravatar imageJerelVelarde ( 2018-10-13 21:01:03 -0600 )edit

That would be something to "complain" about to Fetch. They are the ones who release those packages. I don't own one of those robots, so I don't know, but you could look around to see whether someone forked their pkgs to make them compatible with Melodic.

gvdhoorn gravatar imagegvdhoorn ( 2018-10-14 01:14:53 -0600 )edit

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Asked: 2018-10-12 08:40:30 -0600

Seen: 309 times

Last updated: Oct 12 '18