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/usr/share/gazebo-9/worlds/ray_noise_plugin.world is in gazebo9-common 9.0.0+dfsg5-3ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" ?>
<sdf version="1.5">
  <world name="default">
    <!-- A global light source -->
    <include>
      <uri>model://sun</uri>
    </include>
    <!-- A ground plane -->
    <include>
      <uri>model://ground_plane</uri>
    </include>
    <model name="noisy_ray">
      <pose>0 0 0.1 0 0 0</pose>
      <link name="link">
        <inertial>
          <mass>0.1</mass>
        </inertial>
        <collision name="collision">
          <geometry>
            <box>
              <size>0.2 0.2 0.2</size>
            </box>
          </geometry>
        </collision>
        <visual name="visual">
          <geometry>
            <box>
              <size>0.2 0.2 0.2</size>
            </box>
          </geometry>
        </visual>
        <sensor name="laser" type="ray">
          <pose>0.1 0 0.0175 0 -0 0</pose>
          <ray>
            <scan>
              <horizontal>
                <samples>640</samples>
                <resolution>1</resolution>
                <min_angle>-1.26889</min_angle>
                <max_angle>1.268899</max_angle>
              </horizontal>
            </scan>
            <range>
              <min>0.1</min>
              <max>10</max>
              <resolution>0.01</resolution>
            </range>
            <noise>
              <type>custom</type>
            </noise>
          </ray>
          <plugin name="laser" filename="libRaySensorNoisePlugin.so" />
          <always_on>1</always_on>
          <update_rate>30</update_rate>
          <visualize>true</visualize>
        </sensor>
      </link>
    </model>
  </world>
</sdf>