[vtkusers] Error message with new CVS version

[Charles Boivin]

Hello Amy,

Thank you for the reply. That would indeed explain the errors I was
getting... I will have a look at the PDF to see how that conversion
should take place.

Charles

>>> Amy Henderson <amy.henderson at kitware.com> 11/24/04 12:25pm >>>
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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