Example for read_VTK()

CMakeLists.txt

cmake_minimum_required(VERSION 3.1...3.23)
project(Stroman)

# CGAL and its components
find_package(CGAL REQUIRED)

create_single_source_cgal_program("readVTK.cpp")

find_package(VTK QUIET COMPONENTS vtkCommonCore vtkIOCore vtkIOLegacy vtkIOXML vtkFiltersCore vtkFiltersSources)
if (VTK_FOUND)
  if(VTK_USE_FILE)
    include(${VTK_USE_FILE})
  endif()

  if ("${VTK_VERSION_MAJOR}" GREATER "5" OR VTK_VERSION VERSION_GREATER 5)
    if(TARGET VTK::CommonCore)
      set(VTK_LIBRARIES VTK::CommonCore VTK::IOCore VTK::IOLegacy VTK::IOXML VTK::FiltersCore VTK::FiltersSources)
    endif()

    if(VTK_LIBRARIES)
      target_link_libraries(readVTK PRIVATE ${VTK_LIBRARIES})
      target_compile_definitions(readVTK PRIVATE -DCGAL_USE_VTK -DNOMINMAX)
    else()
      message(STATUS "Tests that use VTK will not be compiled.")
    endif()
  endif()
endif() #VTK_FOUND

read_vtk.cpp

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
#include <CGAL/Surface_mesh.h>
#include <CGAL/IO/VTK.h>
#include <array>
#include <vector>
#
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef K::Point_3 Point_3;
typedef CGAL::Surface_mesh<Point_3> Mesh;

typedef std::vector<std::size_t>  Face;
typedef std::vector<Face> Faces;
typedef std::vector<Point_3> Points;

int main(int argc, char* argv[])
{
  Points points;
  Faces faces;
  CGAL::IO::read_VTK(argv[1], points, faces);

  std::cout << points.size() << " " << faces.size() << std::endl;

   CGAL::Polygon_mesh_processing::orient_polygon_soup(points, faces);

  Mesh mesh;
  CGAL::Polygon_mesh_processing::polygon_soup_to_polygon_mesh(points, faces, mesh);
  CGAL::IO::write_polygon_mesh("mesh.off", mesh, CGAL::parameters::stream_precision(17));

  return 0;
}