image pipeline

[M.Schrijver at el.utwente.nl]

First of all, you shouldn't change attribute data of your input! Always
copy it into a new dataset.

Now, the 'problem' you are describing is caused by the fact that
vtkImageToStructuredPoints does not change the attribute data, and hence
uses a reference-counted copy of it! So, to preserve memory, it does not
actually copy the data. 

Maybe you are looking for a 'deep-copy'? So, instead of using [sp
GetPointData] PassData [etc.] use [sp GetPointData] DeepCopy etc.

Hope this helps, Marc



ir. Marc Schrijver
Faculty of Electrical Engineering (S&S NT)
University of Twente
The Netherlands

> ----------
> From: 	Ana Cugat[SMTP:c1f6326 at hotmail.com]
> Sent: 	Saturday, October 02, 1999 10:03 PM
> To: 	c1f6326 at hotmail.com; vtkusers at gsao.med.ge.com
> Subject: 	Re: image pipeline
> 
> Hello again,
> 
> I've tried as follows:
> 
> vtkImageReader sliceReader
> .
> .
> .
> vtkImageToStructuredPoints toS
>   toS SetInput [sliceReader GetOutput]
> vtkStructuredPoints sp
>   sp CopyStructure [toS GetOutput]
>   [sp GetPointData] PassData [[toS GetOutput] GetPointData]
> 
> and still when I change scalar values in the sp object, the same
> changes 
> occur in sliceReader.
> 
> Does anybody know what is going on??
> 
> Thanks,
> 
> Ana
> 
> 
> 
> 
> 
> 
> >From: "Ana Cugat" <c1f6326 at hotmail.com>
> >To: vtkusers at gsao.med.ge.com
> >Subject: image pipeline
> >Date: Fri, 01 Oct 1999 18:21:06 CEST
> >
> >Hello,
> >
> >I'm using
> >
> >vtkImageReader sliceReader
> >.
> >.
> >.
> >
> >vtkImageToStructuredPoints toS
> >toS SetInput [sliceReader GetOutput]
> >
> >
> >When I change some data attributes of [toS GetOutput] the same
> changes 
> >occur
> >to the slireader data. How can I avoid this?
> >
> >Thanks,
> >
> >Ana
> >
> >
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