[vtkusers] vtkPlaneSource and normal

[Luca Antiga]

If you define vtkPlaneSource with three points a, b, c, you can get the 
normal by vtkMath::Cross(b-a,c-a,n) and then vtkMath::Normalize(n).

Luca


>From: Frederic Huguet <fxh39668 at gsk.com>
>To: vtkusers at public.kitware.com
>Subject: [vtkusers] vtkPlaneSource and normal
>Date: Fri, 07 Jun 2002 13:32:56 +0200
>
>Hi,
>
>I use a vtkPlaneSource and MFC to create a cutting plane on a 3D object.
>But I need to get the normal of this plane in real time. There is no
>function GetNormal, so How could I compute the normal vector to the
>plane ? I thought vtkPlaneWidget was useful but I can't integrate it to
>my MFC Interface. Is there any way to find the normal ?
>
>Thanks
>
>
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