DataArray getRange behaviour with NaN

Web
1

Hello,

When defining a vtkDataArray with NaN, getRange returns [NaN, NaN].

const data = [NaN, 1, 0, 100];
const scalar = vtkDataArray.newInstance({
      name: "test",
      values: data
});

I guess this is a wanted behaviour, but perhaps getRange could take in a parameter to return the range excluding NaN [0, 100]?

2

It is indeed different from the C++/Python behavior.

>>> di = vtk.vtkIntArray()
>>> di.SetNumberOfTuples(4)
>>> di.SetTuple1(0, float("nan"))
>>> di.SetTuple1(1, 1)            
>>> di.SetTuple1(2, 0) 
>>> di.SetTuple1(3, 100) 
>>> di.GetRange()
(-2147483648.0, 100.0)
>>> df = vtk.vtkFloatArray()
>>> df.SetNumberOfTuples(4)
>>> df.SetTuple1(0, float("nan"))
>>> df.SetTuple1(1, 1)
>>> df.SetTuple1(2, 0)
>>> df.SetTuple1(3, 100)
>>> df.GetRange()
(0.0, 100.0)

It makes sense to me to have the same default behavior (ignore NaN when computing range).
I would suggest you can make a PR that modifies the range computation in VTK.js.