GPU laser sensor reflects transparent glass material

edit

Hello, I want to simulate a glass wall in Gazebo and see that the laser scanner can't detect it. In my model I tried to give different laser_retro and transparency settings. In Rviz I always see that the transparent wall reflects the laser scans. Can anybody shed some light on this ?

EDIT

I use Gazebo version 7.4 ROS Kinetic on Ubuntu 16.04

Below is the wall that is supposed not to reflect laser scans.

  <model name="glass1">
    <static>true</static>
    <pose>7 2 1 0 0 0</pose>
    <link name="link">
      <collision name="visual">
         <laser_retro>0.5</laser_retro>
         <geometry><box><size>0.1 2 2</size></box></geometry>
      </collision>
      <visual name="visual1">
         <transparency>1</transparency>
         <geometry><box><size>0.1 2 2</size></box></geometry>
              <material>
              <script><name>Gazebo/RedTransparent</name></script>
             </material>
      </visual>
    </link>
  </model>

Here is the laser plugin definition:

<gazebo reference="hokuyo_link">
<material>Gazebo/Red</material>
<sensor type="gpu_ray" name="hokuyo">
 <pose>0 0 0 0 0 0</pose>
 <visualize>false</visualize>
 <update_rate>40</update_rate>
  <ray>
    <scan>
      <horizontal>
         <samples>720</samples>
          <resolution>1</resolution>
          <min_angle>-1.570796</min_angle>
          <max_angle>1.570796</max_angle>
      </horizontal>
    </scan>
    <range>
       <min>0.10</min> <max>30.0</max>
       <resolution>0.01</resolution>
    </range>
 </ray>
 <plugin name="gpu_laser" filename="libgazebo_ros_gpu_laser.so">
    <topicName>/scan</topicName>
    <frameName>hokuyo_link</frameName>
 </plugin>
</sensor>
</gazebo>