Gzebo中插件类型

（http://gazebosim.org/tutorials?tut=plugins_hello_world&cat=write_plugin）

Gazebo supports several plugin types, and all of them can be connected to ROS, but only a few types can be referenced through a URDF file:

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ModelPlugins, to provide access to the physics::Model API
SensorPlugins, to provide access to the sensors::Sensor API
VisualPlugins, to provide access to the rendering::Visual API

Adding a `ModelPlugin`

In short, the ModelPlugin is inserted in the URDF inside the <robot> element. It is wrapped with the <gazebo> pill, to indicate information passed to Gazebo. For example:

<robot>
  ... robot description ...
  <gazebo>
    <plugin name="differential_drive_controller" filename="libdiffdrive_plugin.so">
      ... plugin parameters ...
    </plugin>
  </gazebo>
  ... robot description ...
</robot>

在RRBot中的位置如下图所示

在Gazebo中加载机器人模型时，diffdrive_plugin代码将被赋予对模型本身的引用，允许它对模型进行操作。此外，它还将引用自身的SDF元素，以便读取传递给它的插件参数。

Adding a `SensorPlugin`

Specifying sensor plugins is slightly different. Sensors in Gazebo are meant to be attached （被链接到） to links, so the <gazebo> element describing that sensor must be given a reference to that link. For example:

<robot>
  ... robot description ...
  <link name="sensor_link">
    ... link description ...
  </link>

  <gazebo reference="sensor_link">
    <sensor type="camera" name="camera1">
      ... sensor parameters ...
      <plugin name="camera_controller" filename="libgazebo_ros_camera.so">
        ... plugin parameters ..
      </plugin>
    </sensor>
  </gazebo>

</robot>