# How to overlay a vector field on a molecule, with output to file for use in ParaView

**URL:** https://discourse.vtk.org/t/how-to-overlay-a-vector-field-on-a-molecule-with-output-to-file-for-use-in-paraview/16357
**Category:** Support
**Tags:** python, file-formats
**Created:** [March 25, 2026, 2:10pm UTC](https://discourse.vtk.org/t/how-to-overlay-a-vector-field-on-a-molecule-with-output-to-file-for-use-in-paraview/16357 "2026-03-25T14:10:46Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![jzwanzig](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/j/cdc98d/32.png) [@jzwanzig](https://discourse.vtk.org/u/jzwanzig)
#### Post date: [March 25, 2026, 2:10pm UTC](https://discourse.vtk.org/t/how-to-overlay-a-vector-field-on-a-molecule-with-output-to-file-for-use-in-paraview/16357/1 "2026-03-25T14:10:46Z")

</div>

Hello, I am generating vector field data in an ab initio physics code, and I am able to convert it to a vtkStructuredGrid and display it nicely in ParaView; I am also able to generate a vtkMolecule and display that nicely in ParaView; but what I would like is to save both in a file, and display in ParaView the vector field overlaid on the molecule. I have tried using MultiBlock but somehow I can’t make a combined view. Any suggestions, or examples to use as a guide, would be most welcome. Thanks!