Write vtk file directly from vtk/pyvista object

[amine-aboufirass]

I am trying to figure out why a mesh generated using fipy will not plot using pyvista. To do this I would like to write it out into a vtk ASCII file, inspect the file and see whether it renders in Paraview. I could not however find an efficient way of getting meshio to write out the vtk file. Here 's some code which can replicate the mesh:

from fipy import CylindricalGrid2D
import pyvista
import meshio

mesh = CylindricalGrid2D(dr=0.1, dz=0.25, nr=3, nz=0.1)
ugrid= pyvista.UnstructuredGrid(mesh.VTKCellDataSet._vtk_obj)

I tried implementing pyvistas save_meshio method but got a KeyError (pyvista/pyvista-support#108). Is there a more direct way using meshio to write out the file? Perhaps without using pyvista alltogether?

[nschloe]

You can build a meshio mesh from the point coordinates and the cell connectivity, e.g.,

meshio.write_points_cells(point_coords, {"tetra": conn})

It seems that the point coordinates are in mesh.vertexCoords. Not sure about the connectivity.

[amine-aboufirass]

will this work for cell type 41

[nschloe]

That's a VTK_CONVEX_POINT_SET, right?

…

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[amine-aboufirass]

correct

[nschloe]

No, there is no support for this in meshio.