[Paraview] Rendering a sub-class of vtkImageData in paraview

[Berk Geveci]

Oh, I see. I was about to write that we should change ShallowCopy() to copy
the Information but I realized that this would have some really bad side
effects. We use Information to store some pipeline meta-data and we don't
want those copied. The easiest way to get around this is to store the
meta-data in FieldData. FieldData arrays should always be copied.

-berk

On Wed, Jun 30, 2010 at 3:45 AM, Lord, John (UK)
<John.Lord at baesystems.com>wrote:

>  Thanks Berk,
>
> I need to store the viewpoint from which the image was created.
> Originally, I was storing this information in the "Information" member
> of vtkDataObject and that worked correctly.  I have now got a set of images
> calculated from different viewpoints stored in a vtkMultiBlockDatset.  I
> want to process these images using plug-in filters that are not composite
> dataset aware and then re-combine the images using the viewpoint
> information.  The problem is that the "vtkCompositeDataPipeline::ExecuteSimpleAlgorithmForBlock"
> method does a shallow copy of the output from the plug-in and the viewpoint
> information is lost.  My idea was to use a sub-class of vtkImageData and
> override the ShallowCopy method to preserve the viewpoint information. This,
> however, leads to the problem of how to render the sub-class in Paraview.
>
> Any suggestions on how to resolve these problems would be gratefully
> received.
>
> Regards,
> John
>
> BAE Systems (Operations) Limited
> Registered Office: Warwick House, PO Box 87, Farnborough Aerospace Centre,
> Farnborough, Hants, GU14 6YU, UK
> Registered in England & Wales No: 1996687
>
>
>  ------------------------------
> *From:* Berk Geveci [mailto:berk.geveci at kitware.com]
> *Sent:* 30 June 2010 01:59
> *To:* Lord, John (UK)
> *Cc:* paraview at paraview.org
> *Subject:* Re: [Paraview] Rendering a sub-class of vtkImageData in
> paraview
>
> *** WARNING *** This message has originated outside your organisation,
> either from an external partner or the Global Internet. Keep this in mind if
> you answer this message. This would probably require changing the ParaView
> code in a few places. I suspect that we have things like
>
> if (classname == "vtkImageData")
>
> all over the place. However, there may be a better solution. Can you
> explain what additional information you are storing in this subclass?
>
> -berk
>
> On Tue, Jun 29, 2010 at 12:15 PM, Lord, John (UK) <
> John.Lord at baesystems.com> wrote:
>
>>  Hi,
>>
>> I have written a sub-class of vtkImageData that holds additional
>> information for processing the data further down the pipeline.  When a
>> filter outputs my sub-class, Paraview gives the message "Cannot show the
>> data in the current view although the view reported that it can show the
>> data."
>>
>> How do I tell Paraview that it should render my sub-class in the same way
>> as a vtkImageData object.
>>
>> Regards,
>> John
>>
>> BAE Systems (Operations) Limited
>> Registered Office: Warwick House, PO Box 87, Farnborough Aerospace Centre,
>> Farnborough, Hants, GU14 6YU, UK
>> Registered in England & Wales No: 1996687
>>
>>
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