vtk

Discussed in pyvista/pyvista#2225

Feature request based on an original suggestion from @sjh26

Is your feature request related to a problem? Please describe.

On windows, a CLI executable started through vtkSlicerCLIModuleLogic::ApplyTask systematically hides any windows. See code here and

Add a PolyDataIO based on the VTK::IOPDALmodule:

https://github.com/Kitware/VTK/tree/master/IO/PDAL

Steps (a complete example can be found here):

0. Verify that the test suite runs and passes

Using drag and drop can be annoying if nodes are far apart and zoomed out.

The docstrings for these classes states:

    auto_update :
        Automatic update rate in seconds.  Useful for automatically
        updating the render window when actors are change without
        being automatically ``Modified``.

However, in the implementation of auto_update, the value of `a