text: #pragma once
  #include "Mesh.h"
  
  namespace wmtk {
      void extract_surface(
              //input:
              TetMesh &mesh,
              //output:
              TriangleSoup &surface);
  
      void remove_tetmesh_exterior( // what does this do?
              //input:
              const TriangleSoup &surface,
              //in&out:
              TetMesh &mesh);
  
      void mark_tetmesh_exterior( // what does this one do?
              //input:
              const TriangleSoup &surface,
              TetMesh &mesh,
              //out
              std::<bool>& is_tet_outside);
  }
  