[vtkusers] reading a collection of polydata

[Michael Jackson]

I typically use vtkMultiBlockDataset as my output type. Each "block"  
is an individual contour vtkPolyData Object.

___________________________________________________________
Mike Jackson                      www.bluequartz.net
Principal Software Engineer       mike.jackson at bluequartz.net
BlueQuartz Software               Dayton, Ohio


On Apr 14, 2010, at 10:58 AM, Dean Inglis wrote:

> I subclassed vtkPolyDataAlgorithm to make a reader for
> text files containg sequences of x-y pairs that represent
> 2D contours.  There are generally more than one contour specified  
> per file.  Currenly I read in each contour and append
> it with vtkAppendPolyData.  The output of the reader is then
> one polydata with its number of cells equal to the number of
> contours.  Further on in my app, I split them back out with
> vtkExtractSelectedPolyDataIds and add them to a vtkPolyDataCollection.
> What I really want is to have the output of the reader to be a  
> vtkPolyDataCollection so that each contour can
> be uniquely retrieved directly from the reader, however, I cant
> find the appropriate parent class that would allow either multiple
> outputs to be specified on the fly during RequestData(...) or
> to have the one output be a vtkPolyDataCollection.   That is,
> there is no parent class named vtkCollectionAlgorithm that specifies
> a collection as its output.  Any design ideas to deal with this
> scenario would be greatly appeciated.
>
> thanks,
> Dean _______________________________________________
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