[vtkusers] moving cells 1/2 cm

[gonza8888]

Hello vtk users.

I have a point P and a cell C. I want to construct one pyramid with P and
the 3 vertices of C. 
And also a pyramid with P and 3 points that should be given by 3 vertices of
a new cell, 1/2 centimeter bigger than  C. 
I.e having 3 vertices  in the plane formed by the vertices of C, such that
the edges of the new cell are 1/2 centimeter far from the edges of C.

I attached an image for better explanation. I know the vertices that are
pointed by the red arrows. I have to know the other 3.

Thank you!

http://vtk.1045678.n5.nabble.com/file/n5713928/pyramid.png 

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