[vtkusers] How to construct the volume data using 2d bitmap

[Suganthi]

Hi,

I am trying to construct a 3d volume from a series of bitmaps (ct-
slices) using the below code, but 
the code crashes at " w->Render();"

Whether the following code flow is correct?

what should be the input for vtkVolumeRayCastMapper?

what are the parameters for SetDataExtent method?

Please help me......

#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkVolume16Reader.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkOutlineFilter.h"
#include "vtkCamera.h"
#include "vtkProperty.h"
#include "vtkPolyDataNormals.h"
#include "vtkContourFilter.h"
#include "vtkBMPReader.h"
#include "vtkImageData.h"
#include "vtkImageActor.H"
#include "vtkVolumeMapper.h"
#include "vtkVolumeRayCastMapper.h"
#include "vtkDataSetMapper.H"

void main()
{
	
        vtkRenderWindow *w=vtkRenderWindow::New();
        vtkBMPReader *r=vtkBMPReader::New();
		vtkVolumeRayCastMapper *vtm =
vtkVolumeRayCastMapper::New();
		vtkRenderer *ren=vtkRenderer::New();
       // vtkImageActor *a=vtkImageActor::New();
		vtkVolume *a = vtkVolume::New();
		vtkRenderWindowInteractor
*i=vtkRenderWindowInteractor::New();
		//vtkVolume16Reader *v=vtkVolume16Reader::New();
       //vtkDataSetMapper *m=vtkDataSetMapper::New();
        i->SetRenderWindow(w);
        r->SetFileDimensionality(2);
        r->SetDataByteOrderToLittleEndian();
            r->SetFilePrefix("new/Slice");
            r->SetFilePattern("%s%d.bmp");
            r->SetDataSpacing(3.0,2.0,3.0);			
			//r->SetDataExtent(0, 63, 0, 63,0,2); // 2
slices
			r->SetDataExtent(0, 255, 0, 255,0,2); // 2
slices
           	vtm->SetInput(r->GetOutput());
			a->SetMapper(vtm);
		    w->AddRenderer(ren);
            ren->AddActor(a);
            w->Render();
            i->Start();
}

regards
SoftUsers



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