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List:       vtkusers
Subject:    Re: [vtkusers] IMAGE filters perform no filtering at all?
From:       <dean.inglis () camris ! ca>
Date:       2004-01-31 22:43:42
Message-ID: 20040131224342.FWVS23238.tomts31-srv.bellnexxia.net () [209 ! 226 ! 175 ! 134]
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you need to understand the basics of vtk's pipeline mechanism:

  vtk_some_image_reader* reader =  vtk_some_image_reader::New();
  reader->Set_some_properties_about_your_data();  // eg SetDimensions(), \
SetDataOrigin(), SetDataSpacing(), SetDataExtent() etc.  \
reader->SetFileName("a_file_name");  reader->Update();

  
  vtk_some_image_filter* filter =  vtk_some_image_filter::New();
  filter->Set_some_filter_parameters();
  filter->SetInput(reader->GetOutput());
  filter->Update();

    
  vtk_some_image_writer* writer =  vtk_some_image_writer::New();
  writer->SetInput(filter->GetOutput());
  writer->SetFileName("another_file_name");
  writer->Write();

there is generally no need to grab pointers to the
image data: ie. Don't do this:


    id->SetDimensions(256,256,0);
	id->SetSpacing(0.78,0.78,0);
	id->SetOrigin(0,0,0);
	id->SetScalarType(VTK_SHORT);
	id->SetNumberOfScalarComponents(1);
	id->AllocateScalars();
	id=pr->GetOutput();
	f->SetInput(id);


spend some time looking at .tcl or .cxx examples and tests
in VTK/Imaging

Dean  


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