Computing a Value From Multiple Inputs with a ParaView Programmable Filter.md

Tags: #paraview #python #scientific-computing

Computing a value from multiple inputs in a Paraview programmable filter requires accessing the inputs via inputs[N] and appending a VTKArray to the output variable:

from paraview.vtk.numpy_interface import dataset_adapter as dsa

dataset_name = "u"

golden = inputs[0].PointData[dataset_name]
result = inputs[1].PointData[dataset_name]

ratio = result / golden
output.PointData.append( dsa.VTKArray( ratio ), "ratio" )

Derived from this Stack Overflow answer.