Once you have set up your development environment, the following steps will download and build VRX:

1. Create a colcon workspace and clone the vrx repository

   mkdir -p ~/vrx_ws/src
   cd ~/vrx_ws/src
   git clone https://github.com/osrf/vrx.git
   

2. Source your ROS 2 installation.

   source /opt/ros/humble/setup.bash
   

3. Build the workspace

   cd ~/vrx_ws
   colcon build --merge-install
   

Now that you've built the simulation, you will need to source the setup script before you can do anything with it. From the root of your workspace, run:

. install/setup.bash

Note that, in general, you always need to perform this step when working with ROS and ROS 2 workspaces. Forgetting to source the environment is one of the most common mistakes among new users. If you're new to ROS 2 workspaces, you may find this tutorial helpful.