[vtkusers] Blank screen when rendering the skin

[Nizam]

Dear all, 
    
    I need to render a sequence of 2d dicom images into a 3d object. I could
do it very well for bones using VTK and the following scheme 

VTKDicomImageReader->vtkMarchingCubes->vtkPolyDataNormals->vtkPolyDataMapper->vtkLODActor->vtkRenderWindow 

and setting the bone.SetValue(0, 1150)

   Then problem is when I try to render the skin [skin.SetValue(0, 500)],
when I am getting a blank screen.  

Any idea what could be? 

Thanks in advance, 
Nizam 

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