Adding physical and collision properties to a URDF model

Before simulating a robot in a robot simulator, such as Gazebo or V-REP, we need to define the robot link's physical properties, such as geometry, color, mass, and inertia, as well as the collision properties of the link.

We will only get good simulation results if we define all these properties inside the robot model. URDF provides tags to include all these parameters and code snippets of base_link contained in these properties, as given here:

<link> 
......     
<collision> 
      <geometry> 
      <cylinder length="0.03" radius="0.2"/> 
      </geometry> 
      <origin rpy="0 0 0" xyz="0 0 0"/> 
    </collision> 
 
    <inertial> 
    <mass value="1"/> 
    <inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/> 
    </inertial> 
........... 
</link> 

Here, we define the collision geometry as cylinder and the mass as 1 kg, and we also set the inertial...