vtkStructuredGridReader is a vtkDataReader subclass. So, unless you are writing a reader that reads a file similar to the legacy VTK files, I'd simply subclass vtkStructuredGridAlgorithm making sure that you set the NumberOfInputPorts to 0 in the constructor of your subclass.
The information widget will only show any fields after you've hit apply. Does it still now show anything? Is so, try putting a break point in your RequestData() function, is that being called? Are you producing valid data there? You might always want to verify that you are reporting correct WHOLE_EXTENT() etc. in the RequestInformation function. Utkarsh. On Sat, Jan 15, 2011 at 5:43 PM, Xunlei Wu <xun...@renci.org> wrote: > Hi David and all, > I am writing a reader plugin for ParaView. A test program without the VTK > wrapping approves that I can get all the header (metadata) and grid data > correctly. However, when I following the examples posted in > http://www.vtk.org/Wiki/ParaView/Examples/Plugins/Reader > http://www.kitware.com/products/html/WritingAParaViewReaderPlug-in.html > and vtkStructuredGridReader.h/.cxx > > I got confused. Shall I subclass vtkStructuredGridAlgorithm or > vtkStructuredGridReader? What are the differences? With minor differences in > the code, i.e. defining char* FileName, I have both scenarios built fine. > > Let's say, we are subclassing vtkStructuredGridAlgorithm for now on. After I > populate values as the following > > int vtkGRIB2Reader::RequestInformation(vtkInformation* vtkNotUsed(request), > > vtkInformationVector** vtkNotUsed(inputVector), > vtkInformationVector *outputVector) > { > ... > vtkInformation* outInfo = outputVector->GetInformationObject(0); > > outInfo->Set(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT(), ext, > 6); > outInfo->Set(vtkDataObject::SPACING(), this->Spacing, 3); > outInfo->Set(vtkDataObject::ORIGIN(), this->Origin, 3); > > return 1; > } > > In ParaView Object Inspector / Information widget, I did not see any update > in all the fields except Statistics / Type: Structured (Curvilinear) Grid. > Would you please help me? Did I populate outInof in the wrong place? Thanks a > lot. > > Best, > xunlei > > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Please keep messages on-topic and check the ParaView Wiki at: > http://paraview.org/Wiki/ParaView > > Follow this link to subscribe/unsubscribe: > http://www.paraview.org/mailman/listinfo/paraview > _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview
