[vtkusers] Combine three single component arrays into one three component array (python)

[Cory Quammen]

Great, I'm glad it worked!

Cory

On Fri, Aug 28, 2015 at 7:59 AM, Jaap Verheggen <jpmverheggen at gmail.com>
wrote:

> You are absolutely right Cory.
>
> I read somewhere that you could only convert 1D or 2D data from numpy
> array to vtk array. So I tried a workaround but it never crossed my mind to
> test if a 3D numpy array would convert. It does.
>
> Thanks for the help!
>
>
>
> On 26-08-15 17:26, Cory Quammen wrote:
>
> Jaap,
>
> There should be no need to append the different array components in this
> scenario. It should be handled directly by the numpy_support.numpy_to_vtk
> function.
>
> Try this:
>
> import vtk
> import vtk.util.numpy_support as ns
> import numpy as np
>
> Array = np.empty([235,3])
> vtkarr = ns.numpy_to_vtk(num_array=Array, deep=True,
> array_type=vtk.VTK_DOUBLE)
>
> >>> vtkarr.GetNumberOfTuples()
> 235L
> >>> vtkarr.GetNumberOfComponents()
> 3
>
> HTH,
> Cory
>
> On Tue, Aug 25, 2015 at 4:14 AM, Jaap Verheggen <jpmverheggen at gmail.com>
> wrote:
>
>> Hello,
>>
>> I am Looking for an easy way to create my point data with Python. I can
>> make three single component arrays, but do not know how to combine that
>> into one three component array which I can feed into a vtkpoints container.
>>
>> # Let's say I have an array of point data, large enough that a loop
>> should be avoided
>> Array = np.empty([235, 3])
>> #I can deconstruct the array in x, y and z
>> VTK_datax = numpy_support.numpy_to_vtk(num_array=Array[:,0].ravel(),
>> deep=True, array_type=vtk.VTK_DOUBLE)
>> VTK_datay = numpy_support.numpy_to_vtk(num_array=Array[:,1].ravel(),
>> deep=True, array_type=vtk.VTK_DOUBLE)
>> VTK_dataz = numpy_support.numpy_to_vtk(num_array=Array[:,2].ravel(),
>> deep=True, array_type=vtk.VTK_DOUBLE)
>> # Maybe I will need a VTK ID array (0..235) Lets just make one
>> VTK_ID =
>> numpy_support.numpy_to_vtk(num_array=np.arange(shape(Array)[0]).ravel(),
>> deep=True, array_type=vtk.VTK_ID_TYPE)
>> # Now I would like to combine x, y and z data into a single array
>> VTK_data = vtk.vtkDoubleArray()
>> VTK_data.SetNumberOfComponents(3)
>> VTK_data.SetNumberOfTuples(235)
>> # However, I do not know how to do this, it could be something like this,
>> VTK_data.SetTuple3(VTK_ID, VTK_datax, VTK_datay, VTK_dataz ) but that
>> doesn't work with arrays.
>> # Afterwards, I would like to fill the data array into a points container
>> points = vtk.vtkPoints()
>> points.SetData(pcoords)
>>
>> Is there a way to combine three single component arrays into a three
>> component array?
>>
>> Thanks in advance,
>>
>>
>>
>>
>>
>>
>> --
>> ---------------------------
>> Jaap Verheggen
>>
>>
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>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
>
>
> --
> ---------------------------
> Jaap Verheggen
> Diepvoorde 2603
> 6605 GN Wijchen
> Nederland
> +31 630 639 268
>
>


-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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