[vtkusers] Calculate Normal of a point

[tony hakki]

Hi all;
I would like to calculate normal vector of a point (x,y,z).  Then I will go through either positive direction or negative direction  of that normal vector to get i.e 5 density values per each direction. As a beginner of vtk I have some problems. Is there a vtk class to overcome this? any suggestions and any example will be very helpful for me.
Thanks in advance
Tony

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