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

[Lord, John (UK)]

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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