[vtkusers] Help!!!!! VtkMarchingCubes::SetValue

[Vicky]

Hi there,

I'll be grateful if someone can help me out.

I want to create models from segmented 2D images (slices).
I have used code like the VTK frog-example from the book "Visualization 
Toolkit: An Object-Oriented Approach to 3D Graphics":

            vtkImageThreshold threshold = new vtkImageThreshold();
            threshold.ThresholdBetween(1,1);
            threshold.SetInValue(255);
            threshold.SetOutValue(0);
            threshold.SetInput(image.GetOutput());

            vtkImageShrink3D shrink = new vtkImageShrink3D();
            shrink.SetInput(threshold.GetOutput());
            shrink.SetShrinkFactors(shrinkFactor);
            shrink.AveragingOn();

            vtkImageGaussianSmooth gaussiansmooth = new 
vtkImageGaussianSmooth();
            gaussiansmooth.SetDimensionality(3);
            gaussiansmooth.SetStandardDeviation(gaussianStandardDeviation);
            gaussiansmooth.SetInput(shrink.GetOutput());

            vtkImageToStructuredPoints structuredPoints = new 
vtkImageToStructuredPoints();
            structuredPoints.SetInput(gaussiansmooth.GetOutput());
            structuredPoints.GetOutput().ReleaseDataFlagOn();

            vtkMarchingCubes marchingCubes = new vtkMarchingCubes();
            marchingCubes.SetInput(structuredPoints.GetOutput());
            marchingCubes.ComputeScalarsOff();
            marchingCubes.ComputeGradientsOff();
            marchingCubes.ComputeNormalsOff();
            marchingCubes.SetValue(0, 450);

            vtkDecimatePro decimate = new vtkDecimatePro();
            decimate.SetInput(marchingCubes.GetOutput());
            decimate.SetFeatureAngle(60.0);
            decimate.SetMaximumError(1);
            decimate.SetTargetReduction(decimateReduction);
            decimate.GetOutput().ReleaseDataFlagOn();

            vtkSmoothPolyDataFilter smoother = new 
vtkSmoothPolyDataFilter();
            smoother.SetInput(decimate.GetOutput());
            smoother.SetNumberOfIterations(smoothIterations);
            smoother.SetRelaxationFactor(RelaxionsFactor);
            smoother.SetFeatureAngle(smoothAngle);
            smoother.FeatureEdgeSmoothingOff();
            smoother.SetConvergence(0);
            smoother.GetOutput().ReleaseDataFlagOn();

            vtkPolyDataNormals normals = new vtkPolyDataNormals();
            normals.SetInput(smoother.GetOutput());
            normals.SetFeatureAngle(featureAngle);
            normals.GetOutput().ReleaseDataFlagOn();

            vtkStripper stripper = new vtkStripper();
            stripper.SetInput(normals.GetOutput());
            stripper.GetOutput().ReleaseDataFlagOn();

            vtkPolyDataWriter writer = new vtkPolyDataWriter();
            writer.SetInput(stripper.GetOutput());
            writer.SetFileName("Ratte_Lila.vtk");
            writer.SetFileType(2);

            ... and so on!

I think the pipeline is correct

But my problem is I can't determine which value is used in 
SetValue-function of the vtkMarchingCubes-class. I don't know how to 
calculate it.This value seems to be different to which tissue will be 
rendered. But how can I calculate this value for each tissue?

I know the first parameter is the contour-number. Is this right?


Can anyone help me?
I'm using vtk 5.0

Thanks!

Vicky