gazebo_models/pine_tree/materials/scripts/pine_tree.material

material PineTree/Branch
{
  technique
  {
    pass
    {
      alpha_rejection greater 128

      texture_unit
      {
        texture branch_2_diffuse.png
      }
    }
  }
}

material PineTree/Bark
{
  technique
  {
    pass
    {
      texture_unit
      {
        texture bark_diffuse.png
      }
    }
  }
}