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It seems that you only installed the hector_quadrotor stack without its dependencies. For compiling the hector_quadrotor stack, you need at least hector_gazebo, hector_models and hector_common (if you want to publish tf). Make sure to have them in your ROS_PACKAGE_PATH or, for fuerte, install them as Ubuntu package with the sudo apt-get install ros-fuerte-hector-quadrotor command. We are going to release hector_quadrotor for groovy soon.

The hector_quadrotor_demo package has been moved to a separate stack, namely hector_quadrotor_apps some time ago. For running the demos with SLAM, you will also need the hector_slam package.

Information about required stacks was indeed incomplete in the tutorials. I have added the missing stacks in the prerequisites section. Thanks for reporting!

Note to me: Probably it would be best to provide a rosinstall file containing all stacks required to run the demo, so that you can checkout them with a single command.