Noob here! I've read through the plugin tutorials, for example
http://gazebosim.org/tutorials?tut=plugins_model&cat=write_plugin
and also the sensors tutorials, and noticed an apparent difference between how plugins are handled. In the model plugin tutorial above there's no mention of a header file for the plugin but in the contact sensor tutorial
http://gazebosim.org/tutorials?tut=contact_sensor&cat=sensors
there is a plugin shown and it includes a header file. Can you tell me the reason for the difference?
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