[vtkusers] add a scalar to RGB values of a .vtk file

[Bill Lorensen]

 imageData->reader(GetOutput);
shopuld be
 imageData = reader->GetOutput();

On Tue, Jan 15, 2013 at 1:33 AM, shirani kannangara
<mangalika673 at gmail.com> wrote:
> HI,
> I want to add a scalar value to RGB values of a .vtk file.(Here I have
> written VHP abdomen data(.mhd) set in .vtk format using ITK andVTK and it is
> working properly). My next attempt is to add a scalar to RGB values of the
> .vtk file and use imageIterator to sweep data.For that I have used VTK
> Examples CXX
>
> VTK/Examples/CXX/Broken/IO/ImageReader2
>
> VTK/Examples/CXX/ImageData/IterateImage Data
>
>
> My codes are as follows
>
> #include <vtkSmartPointer.h>
> #include <vtkImageReader2.h>
> #include <vtkImageData.h>
> #include <vtkRenderWindow.h>
> #include <vtkRenderWindowInteractor.h>
> #include <vtkInteractorStyleImage.h>
> #include <vtkRenderer.h>
> #include <vtkImageActor.h>
> #include <vtkVersion.h>
> #include <vtkSmartPointer.h>
> #include <vtkImageData.h>
>
> int main(int argc, char *argv[])
> {
>   // 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 =("D:\\rgbabdomen\\Debug\\output.vtk");
>
>   // Read file
>   vtkSmartPointer<vtkImageReader2> reader =
>     vtkSmartPointer<vtkImageReader2>::New();
>   reader->SetFileName(("D:\\rgbabdomen\\Debug\\output.vtk"));
>   reader->SetDataScalarTypeToUnsignedChar();
>   reader->Update();
>
> //int main(int, char *[])
>
>   // Create an image data
>   vtkSmartPointer<vtkImageData> imageData =
>     vtkSmartPointer<vtkImageData>::New();
>
>   imageData->reader(GetOutput);
>
>
>
>
>   // Specify the size of the image data
>   imageData->SetDimensions(675,401,450);
> #if VTK_MAJOR_VERSION <= 5
>   imageData->SetNumberOfScalarComponents(GetNumberOfScalars+1);
>   imageData->SetScalarTypeToInt();
>
>
> #else
>   imageData->AllocateScalars(VTK_DOUBLE,1);
> #endif
>
>   int* dims = imageData->GetDimensions();
>   // 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 points: " << imageData->GetNumberOfPoints() <<
> std::endl;
>   std::cout << "Number of cells: " << imageData->GetNumberOfCells() <<
> std::endl;
>
>   // Fill every entry of the image data with "3.0"
>   for (int z = 0; z < dims[2]; z++)
>     {
>     for (int y = 0; y < dims[1]; y++)
>       {
>       for (int x = 0; x < dims[0]; x++)
>         {
>         double* pixel =
> static_cast<double*>(imageData->GetScalarPointer(x,y,z));
>         pixel[0] = 3.0;
>         }
>       }
>     }
>
>   // Retrieve the entries from the image data and print them to the screen
>   for (int z = 0; z < dims[2]; z++)
>     {
>     for (int y = 0; y < dims[1]; y++)
>       {
>       for (int x = 0; x < dims[0]; x++)
>         {
>         double* pixel =
> static_cast<double*>(imageData->GetScalarPointer(x,y,z));
>         // do something with v
>         std::cout << pixel[0] << " ";
>         }
>       std::cout << std::endl;
>       }
>     std::cout << std::endl;
>     }
>
>   // Access the data linearly
>   /*
>     vtkSmartPointer<vtkImageData> image =
>     vtkSmartPointer<vtkImageData>::New();
>   image->SetExtent(0,1,0,1,0,0);
>   image->SetScalarTypeToInt();
>   image->SetNumberOfScalarComponents(1);
>
>   int* pixel;
>
>   pixel = static_cast<int*>(image->GetScalarPointer(0,0,0));
>   pixel[0] = 1;
>
>   pixel = static_cast<int*>(image->GetScalarPointer(1,0,0));
>   pixel[0] = 2;
>
>   pixel = static_cast<int*>(image->GetScalarPointer(0,1,0));
>   pixel[0] = 3;
>
>   pixel = static_cast<int*>(image->GetScalarPointer(1,1,0));
>   pixel[0] = 4;
>
>   vtkIntArray* scalars =
> vtkIntArray::SafeDownCast(image->GetPointData()->GetArray("ImageScalars"));
>   std::cout << "Scalars has " << scalars->GetNumberOfComponents() << "
> components" << std::endl;
>   std::cout << "Scalars has " << scalars->GetNumberOfTuples() << " tuples"
> << std::endl;
>
>   for(vtkIdType i = 0; i < scalars->GetNumberOfTuples(); i++)
>     {
>     std::cout << scalars->GetValue(i) << std::endl;
>     }
>   */
>   return EXIT_SUCCESS;
> }
>
>
>
>   /*
> // 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;
> }*/
>
> There are three errors
> 1>------ Build started: Project: ImageReader2, Configuration: Debug Win32
> ------
> 1>Compiling...
> 1>imagereader.cxx
> 1>.\imagereader.cxx(40) : error C2039: 'reader' : is not a member of
> 'vtkImageData'
> 1>        D:\research2\vtk-5.10.0\VTK\Filtering\vtkImageData.h(35) : see
> declaration of 'vtkImageData'
> 1>.\imagereader.cxx(40) : error C2065: 'GetOutput' : undeclared identifier
> 1>.\imagereader.cxx(48) : error C2065: 'GetNumberOfScalars' : undeclared
> identifier
> 1>Build log was saved at
> "file://d:\dup2\ImageReader2.dir\Debug\BuildLog.htm"
> 1>ImageReader2 - 3 error(s), 0 warning(s)
> ========== Build: 0 succeeded, 1 failed, 2 up-to-date, 0 skipped ==========
>
> CCan you please go through my codes and show me the correct way of doing
> it.I am waiting for  a quick reply from you.
>
> regards
> Shirani
>
> _______________________________________________
> 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 VTK FAQ at:
> http://www.vtk.org/Wiki/VTK_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>



-- 
Unpaid intern in BillsBasement at noware dot com