[vtkusers] reading a collection of polydata

[Dean Inglis]

Mike,

that works beautifully, thanks!

Dean

>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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