Dune-Vtk

File reader and writer for the VTK Format

Summary

Provides structured and unstructured file writers for the VTK XML File Formats that can be opened in the popular ParaView visualization application. Additionally a file reader is provided to import VTK files into Dune grid and data objects.

Requirements

For the management of the grids the dune-grid module is required. Additionally for the data evaluation, the dune-functions module is used.

Optional modules

For tests and examples dune-spgrid and dune-polygongrid are suggested, that support structured grid data or special element types.

Usage

The VTK writer works similar to the dune-grid VTKWriter. It needs to be bound to a GridView and then data can be added to the points or cells in the grid. Points are not necessarily grid vertices, but any coordinates places inside the grid cells, so the data must be provided as GridViewFunction to allow the local evaluation in arbitrary local coordinates.

Grid grid = ...;
VtkWriter<typename Grid::LeafGridView> vtkWriter(grid.leafGridView());

auto fct = makeAnalyticGridViewFunction([](auto const& x) {
  return std::sin(x[0]);
});

vtkWriter.addPointData(fct, "u_points");
vtkWriter.addCellData(fct, "u_cells");

vtkWriter.write("filename.vtu", Vtk::ASCII);

See also the src/ directory for more examples.

Comparison with Dune::VTKWriter

In Dune-Grid there is a VTK writer available, that is a bit different from the proposed one. A comparions: