I am looking to plot a 2D isosurface using VTK in Python. I am trying to visualise the Q-Criterion in Paraview but am looking to build the isosurface into the file rather than using the Paraview option. I couldn’t find much information on whether VTK has a function for this or if there is another alternative. Any suggestions?
What kind of mesh are you starting with?
You can use the vtk.vtkContourFilter
, vtk.vtkMarchingCubes
, and vtk.vtkFlyingEdges3D
to contour (make an isosurface) of 3D data.
Also, if you’re in Python and just getting started with VTK, PyVista might be helpful as it has a convenient helper for these contour filters: https://docs.pyvista.org/examples/01-filter/contouring.html#iso-surfaces
I’m using an unstructured mesh being read from a VTK file. Looking to plot an isosurface of a function I have defined and display it over one of my arrays I have added to the file. Would vtkContourFilter be best since I only need a 2D contour just now? For example if I have my defined function plotted as:
N=-0.5*(dudx**2+dvdy**2+dwdz**2)-
dudy-dvdx
And I just wanted to plot a 2D contour of N=1 over this to view in Paraview?