[vtkusers] add a small description to previous mail

[Bill Lorensen]

Please keep these discussion on the vtk users mailing list.

The image reader autmatically gets the dimensions from the .vtk file.
You should not specify
>   reader->SetDataExtent(0, 680, 0, 401, 1, 450);
>   reader->SetDataSpacing(0.3,0.3,0.3);
>   reader->SetDataOrigin(0.0, 0.0, 0.0);
>   reader->SetDataScalarTypeToUnsignedChar();
>   reader->SetDataByteOrderToLittleEndian();*/

On Tue, Feb 5, 2013 at 3:46 AM, shirani kannangara
<mangalika673 at gmail.com> wrote:
> HI Bill
> I have used imagereader2 to read an RGB image (.vtk file). Imagereader 2 is
> working.But I want the image dimensions to be taken from the
> file(x=675,y=401,z=450).Fuirther my image has voxels and intensity
> values(3d, RGB). What I want finally is to get number of scalars from the
> image and add another  scalar to it.I use vtk version 5.10
> CmakeLists is attached here with.The Command window does not show correct
> outputs.I tried my best to get them displayed .But not success.Can any body
> please help me.
> regards
> Shirani
>
> #include <vtkSmartPointer.h>
> #include <vtkImageReader2.h>
> #include <vtkImageData.h>
> #include <vtkRenderWindow.h>
> #include <vtkRenderWindowInteractor.h>
> #include <vtkInteractorStyleImage.h>
> #include <vtkRenderer.h>
> #include <vtkImageActor.h>
>
> int main(int argc, int *argv[])
> {
> int x=0.0;
> int y=0.0;
> int z=0.0;
>         int ScalarComponents;
> int GetNumberOfScalars=0;
> int GetDimensions=0;
>         int dims[3]={x,y,z};
> // Verify command line arguments
>   /*if(argc < 2)
>     {
>     std::cout << "Usage: " << argv[0]
>               << " InputFilename" << std::endl;
>     return EXIT_FAILURE;
>     }*/
>   // Parse command line arguments
> //std::string inputFilename =(argv[1]);
>
> // Read file
>   vtkSmartPointer<vtkImageReader2> reader =
>     vtkSmartPointer<vtkImageReader2>::New();
>   reader->SetFileName("D:\\rgbabdomen\\Debug\\output.vtk");
>   reader->SetDataScalarTypeToInt();
>  // reader->SetDataScalarTypeToUnsignedChar();
>   reader->UpdateWholeExtent();
>   reader->Update();
>
>   /*reader->SetFilePrefix(argv[3]);
>   reader->SetDataExtent(0, 680, 0, 401, 1, 450);
>   reader->SetDataSpacing(0.3,0.3,0.3);
>   reader->SetDataOrigin(0.0, 0.0, 0.0);
>   reader->SetDataScalarTypeToUnsignedChar();
>   reader->SetDataByteOrderToLittleEndian();*/
>  // reader->UpdateWholeExtent();*/
>
>
>   vtkSmartPointer<vtkImageData> imageData =
> vtkSmartPointer<vtkImageData>::New();
>
>          imageData = reader->GetOutput();
>          imageData->UpdateInformation();
>          imageData->Update();
>
>
> // Specify the size of the image data
>   //imageData->SetDimensions(675,401,450);
>
> #if VTK_MAJOR_VERSION <= 5
>    imageData->SetNumberOfScalarComponents(GetNumberOfScalars+1);
>    imageData->SetScalarTypeToDouble();
>    ScalarComponents=imageData->GetNumberOfScalarComponents();
>
>
> #else
>
>    imageData->AllocateScalars(VTK_DOUBLE,1);
>    //imageData->AllocateScalars();
> #endif
>
>  // int dims[3];
>   imageData->GetDimensions(dims);
>   // int dims[3]; // can't do this
>
> std::cout << "Dims: " << " x: " << dims[0] << " y: " << dims[1] << " z: " <<
> dims[2] << std::endl;
>     std::cout << "Number of
> ScalarComponents:"<<imageData->GetNumberOfScalarComponents()<<std::endl;
>    //std::cout << "Number of
> ScalarComponents:"<<ScalarComponents<<std::endl;
>
>
>  // Create an actor
>   vtkSmartPointer<vtkImageActor> actor =
>     vtkSmartPointer<vtkImageActor>::New();
>   actor->SetInput(reader->GetOutput());
>
>   // Setup renderer
>   vtkSmartPointer<vtkRenderer> renderer =
>     vtkSmartPointer<vtkRenderer>::New();
>   renderer->AddActor(actor);
>   renderer->ResetCamera();
>
>   // Setup render window
>   vtkSmartPointer<vtkRenderWindow> renderWindow =
>     vtkSmartPointer<vtkRenderWindow>::New();
>   renderWindow->AddRenderer(renderer);
>
>   // Setup render window interactor
>   vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
>     vtkSmartPointer<vtkRenderWindowInteractor>::New();
>   vtkSmartPointer<vtkInteractorStyleImage> style =
>     vtkSmartPointer<vtkInteractorStyleImage>::New();
>
>   renderWindowInteractor->SetInteractorStyle(style);
>
>   // Render and start interaction
>   renderWindowInteractor->SetRenderWindow(renderWindow);
>   renderWindowInteractor->Initialize();
>
>   renderWindowInteractor->Start();
>
>   return EXIT_SUCCESS;
> }
>



-- 
Unpaid intern in BillsBasement at noware dot com