[vtkusers] Get normal vector of the closest polydata cell to a given test point

[M. Jordan]

Hello,

i have a test point p[x,y,z] and a polydata.
I use vtkCellLocator to get the closest cell of the polydata to this point.

I get:
- the closest point
- the squared distance to the closest point
- cell ID

Now I want to get the normal vector of the cell. I know the cell ID but I don't know how to get the
normal vector from it.

Thank you!
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