[vtkusers] link between a cell and its normal

[Prabhu Ramachandran]

>>>>> "AG" == alexandre gouaillard <alexandre.gouaillard at insa-lyon.fr> writes:

    AG> hi everyone, i m stuck in what seems to be a very basic
    AG> question, and it's getting on my nerves.

    AG> I'd like to get the normal (which is allready computed, I
    AG> checked) of a specific cell of which I allready got the
    AG> Id. Unfortunatly my knowledge of the normal mechanism in vtk
    AG> is so poor I can't manage to get it.

    AG> I got the cell ID, I managed to get all the normals through
    AG> this (TCL code): set normals [[[$Name GetOutput] GetCellData]
    AG> GetNormals]

    AG> and then .... I don't know how to get my cell's normal out of
    AG> the array.

    AG> Does someone know how to do this ?

In VTK 4.x the normals should be a vtkFloatArray with 3 components.
So if you do a 'GetTuple3 id' after the GetNormals you should get your
desired normal.

prabhu