[vtkusers] ray casting by VTK

[zahra sahaf]

I am actually new to VTK. As a course project, I am going to implement a simple ray caster which could reads raw file and render that, my code is as follows: (unfortunately I did not get result, I don't know what's the problem) Please help me :(
Any help would be appreciated.

vtkRenderer ren1 = vtkRenderer.New();
            vtkRenderWindow renwin = vtkRenderWindow.New();
            vtkRenderWindowInteractor iren = vtkRenderWindowInteractor.New();
            iren.SetRenderWindow(renwin);
            ren1.SetBackground(0, 0, 0);
            renwin.SetSize(600, 600);
          
            ///////////  Read in data and add extract filters
            string filePath = System.IO.Path.GetFullPath(@"C:\Users\Sepid\Desktop\data\MRI-woman.raw");
            Debug.WriteLine(filePath);
            vtkImageReader reader = vtkImageReader.New();
            Debug.Write(filePath);
            reader.SetFileName(filePath);
            reader.SetDataScalarTypeToUnsignedChar();
            reader.SetDataByteOrderToLittleEndian();
            reader.SetDataOrigin(0, 0, 0);
            reader.SetFileDimensionality(3);
            reader.SetDataSpacing(1, 1.5, 1);
            reader.SetDataExtent(0, 255, 0, 108, 0, 255);
            reader.Update();
            //////////////////////////////////////////////////
            vtkVolumeRayCastMapper volumeMapper = vtkVolumeRayCastMapper.New();
            volumeMapper.SetInputConnection(reader.GetOutputPort());

            vtkVolumeRayCastCompositeFunction compositeFunction = vtkVolumeRayCastCompositeFunction.New();

            volumeMapper.SetVolumeRayCastFunction(compositeFunction);
            volumeMapper.SetSampleDistance(0.25);

            //////////////////////////////////////////////////
            vtkPiecewiseFunction opacityTransferFunction = new vtkPiecewiseFunction();
            opacityTransferFunction.AddPoint(1000, 0);
            opacityTransferFunction.AddPoint(1500, 0.2);
            opacityTransferFunction.AddPoint(2000, 0);
            ////////////////////////////////////////////////////
            vtkColorTransferFunction colorTransferFunction = new vtkColorTransferFunction();
            colorTransferFunction.AddRGBPoint(1000, 0, 0, 0);
            colorTransferFunction.AddRGBPoint(1500, 1, 0.5, 0.5);
            ///////////////////////////////////////////////////
            vtkVolumeProperty volumeProperty = new vtkVolumeProperty();
            volumeProperty.SetColor(colorTransferFunction);
            volumeProperty.SetScalarOpacity(opacityTransferFunction);
            ///////////////////////////////////////////////////
            vtkVolume volume = new vtkVolume();
            volume.SetMapper(volumeMapper);
            volume.SetProperty(volumeProperty);

           ren1.AddVolume(volume);
           // ren1.AddViewProp(volume);

            iren.Initialize();
            iren.Start();
            renwin.Render();

 
Bests,
Zahra
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