vtkCalculator fails with vtkImageData as input

[davidborland]

High-level description

vtkCalculator does not work on vtkImageData because vtkImageData does not have a getPoints method.

Steps to reproduce

1. Use vtkImageData as an input to vtkCalculator.
2. Call setFormulaSimple, e.g.

calculator.setFormulaSimple(
    FieldDataTypes.POINT,
    ['scalars'],
    'mask',
    value => value > 10 ? 1 : 0
  );

Detailed behavior

getPoints is called in two locations in prepareArrays that cause problems for the above scenario:

1. line 128: arraysIn.push(inData.getPoints());
   (This is due to the coordinate data that gets added in augmentInputArrays)

2. line 194: (x) => x.getPoints().getNumberOfPoints(),

Expected behavior

I was able to get it working for my use case (applying a simple threshold to some image data) by placing checks before the getPoints calls:

1. if (inData.getPoints) arraysIn.push(inData.getPoints());
2. (x) => x.getPoints ? x.getPoints().getNumberOfPoints() : x.getNumberOfPoints()

Not sure if this is the preferred solution though.

Environment

• vtk.js: v22.2.2
• OS: Ubuntu-18.04 VM running on Windows 10
• Browser: Chrome Version 97.0.4692.99 (Official Build) (64-bit) (Windows)

[github-actions]

🎉 This issue has been resolved in version 28.12.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• GitHub release

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