hi all..,
 there is my code to render a 3D Volume of MRI slice., 
it works good but  it displayed in a worng way (contrast is too bad and also it seems not fit in the slice it self like the data was overlaped each other)
i think the problem in reading the files(or may be in Opacity..).
here is my code:..( i changed the opacity,color but no effect..).. can any one help me to find 
where is the problem here?



vtkRenderer *aRenderer = vtkRenderer::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
    renWin->AddRenderer(aRenderer);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renWin);

	
	vtkTIFFReader *Reader = vtkTIFFReader::New();
    Reader->SetFilePrefix ("D:/tiff/TIFF/MRI"); //Location of slices
    Reader->SetFilePattern("%s%.4d.tif");
    Reader->SetDataExtent (0,255,0,255,1,15); //No.of slices
	Reader->SetDataSpacing(1,1,1);
	Reader->Update();
	
	vtkPiecewiseFunction *oTFun =vtkPiecewiseFunction::New();
	oTFun->AddSegment(80,0.0,255,1.0);
	vtkPiecewiseFunction *gTFun =vtkPiecewiseFunction::New();
	gTFun->AddSegment(0,1.0,255,1.0);
	vtkVolumeProperty *volProperty = vtkVolumeProperty::New();
	volProperty->SetColor(gTFun);
	
	//volProperty->SetOpacity(oTFun);
	volProperty->SetInterpolationTypeToLinear();
	volProperty->ShadeOn();

	vtkVolumeRayCastCompositeFunction *compositeFunction= vtkVolumeRayCastCompositeFunction::New();
vtkVolumeRayCastMapper *volMapper = vtkVolumeRayCastMapper::New();
    	volMapper->SetInput(Reader->GetOutput()); 
	volMapper->SetVolumeRayCastFunction(compositeFunction);

	vtkVolume *vol=vtkVolume::New();
	vol->SetMapper(volMapper);  
	vol->SetProperty(volProperty); 
	aRenderer->AddVolume(vol);
	aRenderer->SetBackground(1,1,1);
	
	vtkCamera *aCamera = vtkCamera::New();
    aCamera->SetViewUp (0, 0, -1);
    aCamera->SetPosition (0, 1, 0);
    aCamera->SetFocalPoint (0, 0, 0);
    aCamera->ComputeViewPlaneNormal();
	 aRenderer->SetActiveCamera(aCamera);
	 aRenderer->ResetCamera ();
	 aCamera->Dolly(1.5);
    
	 renWin->SetSize(640, 480);
	iren->SetDesiredUpdateRate(3.0);
	iren->Initialize();
	iren->Start(); 

thanx.. yasser

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