gazebo_models/stop_sign/materials/scripts/stopsign.material

material StopSign/Diffuse
{
  technique
  {
    pass
    {
      texture_unit
      {
        texture StopSign_Diffuse.tga
      }
    }
  }
}

material StopSign/Specular
{
  technique
  {
    pass
    {
      texture_unit
      {
        texture StopSign_Spec.tga
      }
    }
  }
}