[vtk-developers] Python and the function GetParametricCoords()

[David Gobbi]

Hi Andrew,

It's missing a size hint for the wrappers, it should be declared like this:

virtual double *GetParametricCoords() VTK_SIZEHINT(3);

I've submitted an MR: https://gitlab.kitware.com/vtk/vtk/merge_requests/3944
It's strange, it never had a hint in the old "hints" file, either.

 - David

On Sun, Feb 18, 2018 at 3:20 PM, Andrew Maclean <andrew.amaclean at gmail.com>
wrote:

> I was looking at converting Bill's excellent example: https://lorensen.
> github.io/VTKExamples/site/Cxx/GeometricObjects/IsoparametricCellsDemo/
> into Python but I have run into a problem with respect to
>  GetParametricCoords()
>
> It seems to return a void pointer not an expected tuple even though the
> example below is a primary cell.
>
> There are no tests in the Python tests for GetParametricCoords() yet it is
> wrapped Ok as far as I can see. Does anyone have a solution?
>
> Here is some test code that illustrates the problem:
>
> #!/usr/bin/env python
> # -*- coding: utf-8 -*-
>
> import vtk
>
>
> def main():
>     xx = vtk.vtkQuadraticEdge()
>     print('Is it a primary cell?', xx.IsPrimaryCell())
>     # help(vtk.vtkQuadraticEdge.GetBounds)
>     # help(vtk.vtkQuadraticEdge.GetParametricCoords)
>     # print(dir(vtk.vtkQuadraticEdge))
>     pcoords = xx.GetParametricCoords()
>     #  Here we expect a tuple of nine floats.
>     print('pcoords:', pcoords)
>     # GetBounds() works.
>     bounds = xx.GetBounds()
>     print('bounds:', bounds)
>
>
> if __name__ == '__main__':
>     main()
>
>
>
>
> --
> ___________________________________________
> Andrew J. P. Maclean
>
> ___________________________________________
>
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