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irg_open's Introduction

irg_open

This is a repository of tools to be shared across projects. It is open source, so do not add anything private or EAR/ITAR restricted. It originated in the Intelligent Robotics Group (IRG) at NASA Ames Research Center. Hence the name.

Notices:

Copyright © 2020-2023 United States Government as represented by the Administrator of the National Aeronautics and Space Administration. All Rights Reserved.

Disclaimers

No Warranty: THE SUBJECT SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR FREEDOM FROM INFRINGEMENT, ANY WARRANTY THAT THE SUBJECT SOFTWARE WILL BE ERROR FREE, OR ANY WARRANTY THAT DOCUMENTATION, IF PROVIDED, WILL CONFORM TO THE SUBJECT SOFTWARE. THIS AGREEMENT DOES NOT, IN ANY MANNER, CONSTITUTE AN ENDORSEMENT BY GOVERNMENT AGENCY OR ANY PRIOR RECIPIENT OF ANY RESULTS, RESULTING DESIGNS, HARDWARE, SOFTWARE PRODUCTS OR ANY OTHER APPLICATIONS RESULTING FROM USE OF THE SUBJECT SOFTWARE. FURTHER, GOVERNMENT AGENCY DISCLAIMS ALL WARRANTIES AND LIABILITIES REGARDING THIRD-PARTY SOFTWARE, IF PRESENT IN THE ORIGINAL SOFTWARE, AND DISTRIBUTES IT "AS IS."

Waiver and Indemnity: RECIPIENT AGREES TO WAIVE ANY AND ALL CLAIMS AGAINST THE UNITED STATES GOVERNMENT, ITS CONTRACTORS AND SUBCONTRACTORS, AS WELL AS ANY PRIOR RECIPIENT. IF RECIPIENT'S USE OF THE SUBJECT SOFTWARE RESULTS IN ANY LIABILITIES, DEMANDS, DAMAGES, EXPENSES OR LOSSES ARISING FROM SUCH USE, INCLUDING ANY DAMAGES FROM PRODUCTS BASED ON, OR RESULTING FROM, RECIPIENT'S USE OF THE SUBJECT SOFTWARE, RECIPIENT SHALL INDEMNIFY AND HOLD HARMLESS THE UNITED STATES GOVERNMENT, ITS CONTRACTORS AND SUBCONTRACTORS, AS WELL AS ANY PRIOR RECIPIENT, TO THE EXTENT PERMITTED BY LAW. RECIPIENT'S SOLE REMEDY FOR ANY SUCH MATTER SHALL BE THE IMMEDIATE, UNILATERAL TERMINATION OF THIS AGREEMENT.

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irg_open's Issues

VisualPlugins on ros2 branch that are loaded in both gzserver and gzclient have non-unique ROS node names

Gazebo VisualPlugins can be loaded in both gzserver's camera sensor rendering thread and gzclient's user camera rendering thread. Some of the VisualPlugins in irg_gazebo_plugins on the ros2 branch use gazebo_ros::Node::Get(_sdf) to initialize a ROS 2 node for the plugin (such as LinkTracksPlugin and GlobalShaderParamPlugin). As called, this helper function sets the ROS node name from the plugins XML name attribute and will give the same name to ROS nodes associated with both gzserver and gzclient.

Currently many ROS 2 features and design assumptions depend on unique node names (ros2/design#187), so it would be beneficial to follow that pattern. There is an overload of gazebo_ros::Node::Get that accepts a std::string as a second parameter to use for the ROS node name, so it is straightforward to set this name programmatically.

Some approaches to name uniqueness include adding a random suffix (based on PID or time) to the node name or a suffix based on whether the plugin is loaded by gzserver or gzclient. One approach to determining whether a VisualPlugin is loaded by gzserver or gzclient is by checking the RMT_PORT environment variable (used for visualizing profiler data), which is set to 1500 in gzserver's server_main.cc and 1501 in gzclient's main.cc. This is not elegant, but would be straightforward to implement.

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