[vtkusers] About a Stack of *.BMP Slices Rendering!

[#YAN RI AN#]

Dear VTK-Users:
There was no problem when I Read in & 3D Render & Write out  *.stl Format the Headsq files which provided by Kitware Co..
But I met the problem when I read a stack of 512x512x256 *.BMP head slice files.
The XY boundary size of the files is 220.2mm X 220.2mm. 
I renamed it into *.01,*.02...... already, It could read but could not rendering.
I did not know how to pre-process,process & post process the stack of *.BMP format slices.
Could anyone share some experience about it?
Here is my program:

  vtkImageReader *reader=vtkImageReader::New();
  reader->SetFilePrefix("g:/00head/h");
  reader->SetDataByteOrderToLittleEndian();
  reader->SetDataExtent(0,220,0,220,1,33);
   reader->SetDataSpacing(1,1,3);
  reader->SetDataMask(0x7ff);

   vtkMarchingContourFilter *iso=vtkMarchingContourFilter::New();
    iso->SetInput(reader->GetOutput());
    iso->SetValue(0,1150);

  vtkPolyDataMapper *isoMapper=vtkPolyDataMapper::New();
  isoMapper->SetInput(iso->GetOutput());
  isoMapper->ScalarVisibilityOff();


   vtkActor *isoActor=vtkActor::New();
    isoActor->SetMapper(isoMapper);
	isoActor->GetProperty()->SetColor(1,1,1);

    vtkRenderer *ren1 = vtkRenderer::New();
	ren1->AddActor(isoActor);
	ren1->SetBackground(0.2,0.3,0.5);

*************************************** 
* Best Regards
* Yan Rian (Research Student) 
* Email : ps7278514b at ntu.edu.sg
* Lab : AMRC Research Centre 
* Nanyang Technological University 
* Singapore 
***************************************