message: forgot extension
diff: <param name="slice_level" value="1.0" />
  <param name="method" value="merged_discard" />
  <param name="use_const_weight" value="true" />
  - <param name="mesh_filename" value="$(find voxblox_ros)/mesh_results/$(anon kitti)" />
  + <param name="mesh_filename" value="$(find voxblox_ros)/mesh_results/$(anon kitti).ply" />
  </node>
  </launch>
  