[vtkusers] How to mark a point perpendicular to surface?

[Bill Lorensen]

You could run polydatanormals and tell it to generate cell normals. Then
for your cell, get the normal.

On Thu, Aug 30, 2018, 9:46 AM Polly Pui <polly_sukting at hotmail.com> wrote:

> Hi,
>
> I would like mark a point/find the point which is perpendicular to the
> centroid of a region in a polydata.
>
> Please refer to the attached image.
>
> How can I make a keypoint (marked in red) which is z normal to the given
> coordinates (marked as +)?
>
>
> Thank you.
>
>
> Polly
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