[vtkusers] vtkImageImport , vtkImageViewer : window black

[Olaf Till]

Hi,

I try to use VDK to render images from memory. As yet, I only get
windows filled with black. The following is some example code, which
produces a black window, although I thought that half of the image
should be white. Can you give me a hint what is the reason?

Olaf

--- example code ---

#include <unistd.h>
#include <vtk-5.0/vtkImageImport.h>
#include <vtk-5.0/vtkImageViewer.h>

// compile with: g++ -Wno-deprecated -ggdb -lvtkRendering -lvtkImaging -o render-image-test render-image-test.cc

int
main (int argc, char **argv) {

  unsigned char buffer[64] =
    {255, 255, 255, 255, 255, 255, 255, 255,
     255, 255, 255, 255, 255, 255, 255, 255,
     255, 255, 255, 255, 255, 255, 255, 255,
     255, 255, 255, 255, 255, 255, 255, 255,
     0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0};


  vtkImageImport *importer = vtkImageImport::New();
  importer->SetWholeExtent(0,7,0,7,0,0);
  importer->SetDataExtentToWholeExtent();
  importer->SetDataScalarTypeToUnsignedChar();
  importer->SetImportVoidPointer(buffer);

  vtkImageViewer *viewer = vtkImageViewer::New();
  viewer->SetInputConnection(importer->GetOutputPort());

  viewer->Render();

  sleep (5);

}