[vtkusers] Error message with new CVS version

[Amy Henderson]

Hi Charles,

We are in the middle of changing the readers, sources, and filters in VTK 
to use the new pipeline architecture that was recently introduced.  In this 
process, the reader, source, and filter classes are becoming subclasses of 
vtkAlgorithm instead of vtkSource.  We are maintaining backward 
compatibility for classes directly subclassed from the classes in Filtering 
(e.g., subclasses of vtkPolyDataToPolyDataFilter).  Since this is not the 
case for your class, you will need to change your class to use the new 
pipeline architecture.  In the Utilities/Upgrading directory, there is a 
file called TheNewVTKPipeline.pdf.  This document introduces you to the new 
pipeline and provides some direction for converting an existing class to 
the new pipeline.  There is also a CMake script in that directory 
(NewPipeConvert.cmake) that will help you in the process of making the 
conversion.  Instructions for using the script are contained in the PDF.

- Amy

At 01:31 PM 11/24/2004, Charles Boivin wrote:
>Hello all,
>
>I updated my CVS version of VTK yesterday, and I am having some errors
>with my own library that uses VTK.
>
>I wrote a reader object, derived from vtkVolumeReader, and I am getting
>these error messages in the output window:
>
>ERROR: In \Vtkcvs\Vtk\Filtering\vtkImageData.cxx, line 1471
>vtkImageData (02B2BFD8): Attempt to allocate scalars before scalar type
>was set!.
>
>My reader used to work just fine before, but now it seems that it is
>not passing a valid vtkImageData object to the rest of the pipeline. Did
>some requirements change recently? If so, where can I find information
>on this?
>
>I was able to get rid of the error message by adding:
>
>vtkInformation* pInfo = this->GetOutput()->GetPipelineInformation();
>pInfo->Set(vtkDataObject::SCALAR_TYPE(), VTK_FLOAT);
>
>in my reader code. However, even though I am not getting error message
>anymore, the output is basically "empty", i.e. the size is wrong (my
>guess is that it is returning [0..1] for all coordinates), and there
>does not seem to be any data available.
>
>Anyone here experiencing the same problem? I am at a bit of a loss,
>here.
>
>Thank you,
>
>Charles
>
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