transparency.world

<sdf version='1.4'>
  <world name='default'>
    <!-- include sun and ground plane -->
    <include><uri>model://sun</uri></include>
    <include><uri>model://ground_plane</uri></include>

    <model name="test_model">
      <static>true</static>
      <link name="link">
        <visual name="visual_00">
          <pose>0 0 0.5  0 0 0</pose>
          <transparency>0.0</transparency>
          <geometry>
            <sphere><radius>0.5</radius></sphere>
          </geometry>
          <material><script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/Grey</name>
          </script></material>
        </visual>
        <visual name="visual_02">
          <pose>2 0 0.5  0 0 0</pose>
          <transparency>0.2</transparency>
          <geometry>
            <sphere><radius>0.5</radius></sphere>
          </geometry>
          <material><script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/Grey</name>
          </script></material>
        </visual>
        <visual name="visual_04">
          <pose>4 0 0.5  0 0 0</pose>
          <transparency>0.4</transparency>
          <geometry>
            <sphere><radius>0.5</radius></sphere>
          </geometry>
          <material><script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/Grey</name>
          </script></material>
        </visual>
        <visual name="visual_06">
          <pose>6 0 0.5  0 0 0</pose>
          <transparency>0.8</transparency>
          <geometry>
            <sphere><radius>0.5</radius></sphere>
          </geometry>
          <material><script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/Grey</name>
          </script></material>
        </visual>
        <visual name="visual_08">
          <pose>8 0 0.5  0 0 0</pose>
          <transparency>0.8</transparency>
          <geometry>
            <sphere><radius>0.5</radius></sphere>
          </geometry>
          <material><script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/Grey</name>
          </script></material>
        </visual>
        <visual name="visual_10">
          <pose>10 0 0.5  0 0 0</pose>
          <transparency>1.0</transparency>
          <geometry>
            <sphere><radius>0.5</radius></sphere>
          </geometry>
          <material><script>
            <uri>file://media/materials/scripts/gazebo.material</uri>
            <name>Gazebo/Grey</name>
          </script></material>
        </visual>
      </link>
    </model>
    <gui fullscreen='0'>
      <camera name='user_camera'>
        <pose>5.0 -10.0 1.5  0.0 0.0 1.57079</pose>
        <view_controller>orbit</view_controller>
      </camera>
    </gui>
  </world>
</sdf>