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Temperature results do not display with VTK file

See original GitHub issue

I would like to use itk-jupyter-widgets to view battery simulation results in a JupyterLab notebook. Previously I used K3D to view the VTK file (see example below).

import k3d
import vtk

filename = 'case1.vtk'

reader = vtk.vtkUnstructuredGridReader()
reader.SetFileName(filename)
reader.Update()

geometryFilter = vtk.vtkGeometryFilter()
geometryFilter.SetInputData(reader.GetOutput())
geometryFilter.Update()

plot = k3d.plot()
thermal = k3d.vtk_poly_data(geometryFilter.GetOutput(), color_attribute=('Battery_Temperature', 296, 316))
plot += thermal
plot.display()

My attempt with the itk-jupyter-widget is shown below.

import vtk
from itkwidgets import view

file_name = 'case1.vtk'

reader = vtk.vtkUnstructuredGridReader()
reader.SetFileName(file_name)
reader.Update()

geometryFilter = vtk.vtkGeometryFilter()
geometryFilter.SetInputData(reader.GetOutput())
geometryFilter.Update()
case1 = geometryFilter.GetOutput()

view(geometries=case1)

The itk widget will display the VTK file in the notebook but the temperature gradient from the simulation results is not visible. In K3D, the temperature results were defined with color_attribute=('Battery_Temperature', 296, 316) but I do not see how to accomplish this with the itk widget.