[vtkusers] Re: about vtkPolyDataNormals

[Goodwin Lawlor]

Hi Petru,

By default vtkPolyDataNormals computes point normals. The point normals are
already normalized for you. The normals to points, are the normalized
accumulation of the normals to the polygons that share that point.

vtkPolyDataNormals class always computes the cell normals but will only add
them to the output if you ask it to ->ComputeCellNormalsOn() .

hth

Goodwin


"Petru Pau" <ppau at risc.uni-linz.ac.at> wrote in message
news:410617B6.9050008 at risc.uni-linz.ac.at...
> One can use vtkPolyDataNormals to compute normal vectors for each face
> (I wonder what is the meaning of the "normals to points").
>
> Is there an easy way to normalize these vectors? They come with various
> norms,
> and some applications need to have them with norm 1.
>
> Petru
>
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