[vtkusers] Tangent through a given point on a surface

Maximilian Weiherer weiherer.maximilian at gmx.de
Wed Feb 27 09:48:33 EST 2019

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

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


Any help would be appreciated. 

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