Tutorial Intermediate: Velodyne, not spinning. Just Gazebo, no ros

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1. Should there be any indication of spin?

   1. Should the Force tab values reset to 0.0 anytime you click away?
   2. Is there starting and ending code for these tutorials? I could solve my issue with that...

2. Unrelated, but really I must know.. are there plans to implement an undo button or load function to compliment the saveas function? I see that someone asked about the undo button a couple of years ago and was told it was implemented for gazebo8, but I am running gazebo9 so maybe that isn't available anymore?

From: http://gazebosim.org/tutorials?cat=gu...

<?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="velodyne_hdl-32">
  <!-- Give the base link a unique name -->
  <link name="base">

    <!-- Offset the base by half the lenght of the cylinder -->
    <pose>0 0 0.029335 0 0 0</pose>


  <inertial>
      <mass>1.2</mass>
      <inertia>
        <ixx>0.001087473</ixx>
        <iyy>0.001087473</iyy>
        <izz>0.001092437</izz>
        <ixy>0</ixy>
        <ixz>0</ixz>
        <iyz>0</iyz>
      </inertia>
    </inertial>


    <collision name="base_collision">
      <geometry>
        <cylinder>
          <!-- Radius and length provided by Velodyne -->
          <radius>.04267</radius>
          <length>.05867</length>
        </cylinder>
      </geometry>
    </collision>

    <!-- The visual is mostly a copy of the collision -->
    <visual name="base_visual">
      <geometry>
        <cylinder>
          <radius>.04267</radius>
          <length>.05867</length>
        </cylinder>
      </geometry>
    </visual>
  </link>

  <!-- Give the base link a unique name -->
  <link name="top">

    <!-- Vertically offset the top cylinder by the length of the bottom
        cylinder and half the length of this cylinder. -->
    <pose>0 0 0.095455 0 0 0</pose>
 <inertial>
     <mass>0.1</mass>
     <inertia>
       <ixx>0.000090623</ixx>
       <iyy>0.000090623</iyy>
       <izz>0.000091036</izz>
       <ixy>0</ixy>
       <ixz>0</ixz>
       <iyz>0</iyz>
     </inertia>
   </inertial>

    <collision name="top_collision">
      <geometry>
        <cylinder>
          <!-- Radius and length provided by Velodyne -->
          <radius>0.04267</radius>
          <length>0.07357</length>
        </cylinder>
      </geometry>
    </collision>

    <!-- The visual is mostly a copy of the collision -->
    <visual name="top_visual">
      <geometry>
        <cylinder>
          <radius>0.04267</radius>
          <length>0.07357</length>
        </cylinder>
      </geometry>
    </visual>
  </link>








<!-- Each joint must have a unique name -->
<joint type="revolute" name="joint">

  <!-- Position the joint at the bottom of the top link -->
  <pose>0 0 -0.036785 0 0 0</pose>

  <!-- Use the base link as the parent of the joint -->
  <parent>base</parent>

  <!-- Use the top link as the child of the joint -->
  <child>top</child>

  <!-- The axis defines the joint's degree of freedom -->
  <axis>

    <!-- Revolve around the z-axis -->
    <xyz>0 0 1</xyz>

    <!-- Limit refers to the range of motion of the joint -->
    <limit>

      <!-- Use a very large number to indicate a continuous revolution -->
      <lower>-10000000000000000</lower>
      <upper>10000000000000000</upper>
    </limit>
  </axis>
</joint>

</model>

  </world>
</sdf>

Version. Newest, installed with ROS, Ubuntu 18.04 lts:

$ gazebo --version
Gazebo multi-robot simulator, version 9.0.0
Copyright (C) 2012 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org


Gazebo multi-robot simulator, version 9.0.0
Copyright ...