vtk unstructureddata (vtu file) file type can be loaded?

[zhangcl-163]

since vtk.js -itk, unstructureddata file (vtu) can be loaded.
in itk-wasm, does it support vtu file type to be loaded?
or it is supported in seperate itk-wasm io module?

any suggestions are appreciated!

[thewtex]

Hi @zhangcl-163 ,

vtu is not planned in the current future as far as I am aware; however, .vtk unstructured data is planned around December.

[jord1e]

Hey Matt, did UNSTRUCTURED_DATA get implemented?

My models are working fine with itk.js but itk-wasm is crashing without any usefull error codes so this might be the problem

I don't think I need it, but maybe it would help people in the future

For now I am just doing an extra postprocessing step of converting to XML PolyData:

import vtk

# Step 1: Read the unstructured grid data
reader = vtk.vtkUnstructuredGridReader()
reader.SetFileName("x.vtk")
reader.Update()

# Step 2: Convert the unstructured grid to polydata
geometryFilter = vtk.vtkGeometryFilter()
geometryFilter.SetInputData(reader.GetOutput())
geometryFilter.Update()

# Step 3: Write the polydata to a new VTK file
polydata = geometryFilter.GetOutput()
writer = vtk.vtkXMLPolyDataWriter()
writer.SetFileName("x.vtk")
writer.SetInputData(polydata)
writer.Write()

Than using the https://kitware.github.io/vtk-js/examples/XMLPolyDataWriter.html
But it did take some time to figure out that that is possible :)

[thewtex]

@jord1e thanks for sharing the workaround!

I currently do not have plans to add VTU support, but contributions are welcome.

[jord1e]

Thank you for the update!

The workaround is working perfectly, and I am getting WAY better performance as compared to using the vtk.js IO/Legacy vtkITKPolyDataReader/ITKPolyDataReader + itk.js+ setReadPolyDataArrayBufferFromITK

Hoping Google guides people to it ;)

[thewtex]

xref: #1261