[vtkusers] Array order in VTK?

[Elvis Stansvik]

2016-09-19 15:24 GMT+02:00 Cory Quammen <cory.quammen at kitware.com>:
> Elvis,
>
> VTK image data arrays are stored such that the X dimension increases
> fastest, followed by Y, followed by Z.
> Concrete example where dimensions of the image are XDIM, YDIM, ZDIM:
>
> Array index : i,j,k indices
> 0 : (0, 0, 0)
> 1 : (1, 0, 0)
> 2 : (2, 0, 0)
> ...
> XDIM : (0, 1, 0)
> XDIM+1 : (1, 1, 0)
> XDIM+2 : (2, 1, 0)
> ...
> XDIM*YDIM : (0, 0, 1)
> XDIM*YDIM + 1 : (1, 0, 1)
>
> So I guess that is Fortran order?

Right, thanks for the clarification Cory.

Elvis

>
> HTH,
> Cory
>
> On Mon, Sep 19, 2016 at 1:40 AM, Elvis Stansvik
> <elvis.stansvik at orexplore.com> wrote:
>> Hi all,
>>
>> This is a simple question: I haven't been able to find any info on
>> whether arrays (images, ...) are stored in row major (C) or column
>> major (Fortran) order in VTK.
>>
>> I assumed they are in C order, but then I saw this blog post:
>>
>>     https://blog.kitware.com/developing-hdf5-readers-using-vtkpythonalgorithm/
>>
>> In a comment the author says
>>
>>     # Note that we flip the dimensions here because
>>     # VTK's order is Fortran whereas h5py writes in
>>     # C order. We don't want to do deep copies so we write
>>     # with dimensions flipped and pretend the array is
>>     # C order.
>>
>> which made me a little unsure. What is the array order of the data
>> classes in VTK, and is it the same for all classes?
>>
>> Thanks,
>> Elvis
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>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.