there seems to be a problem with the vtkContourTriangulator example on the official website

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I want to use vtkContourTriangulator，But there seems to be a problem with the vtkContourTriangulator example on the official website, which does not show the filtered results，The sample URL is “https://kitware.github.io/vtk-js/examples/ContourTriangulator.html”。If there is any problem with the example, please provide the correct usage example. Thank you very much

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I had a quick look at the example, and seems like the vtkContourTriangulator filter might be broken as its not returning a populated cell array. I have logged an issue on github here:
The vtkContourTriangulator filter and associated example is broken · Issue #2775 · Kitware/vtk-js (github.com)

Thanks for reporting this.