tianracer_description: urdf file bug report

[chargerKong]

Three problems remain:

• AFAIK, to load the STL file in Gazebo, the mesh tag should be written as something like this

  filename="model://tianracer_description/meshes/left_steering_hinge.STL
  

  However, it should be written as

  filename="packages://tianracer_description/meshes/left_steering_hinge.STL
  

  to visualize it in rviz, which is incompatible with the Gazebo.

• I'm not sure whether the model misses one fixed frame to connect the left front wheel and right front wheel left_front
  

• This model is unstable in Gazebo. It can move by itself without any external force
  .