[vtkusers] Tangent through a given point on a surface

[Maximilian Weiherer]

Hi all, 

 

how can I calculate a tangent (in 3d usually a plane) through a given point
on a surface using VTK? I already tried the following:

-          Use an implicit dataset to transform polydata to an implicit
surface representation and then

-          calculate the gradient at the given point using the method
FunctionGradient(.). 

However, the gradient I received seems to be wrong (which is (0, 0, 1)). 

 

Any help would be appreciated. 

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