[vtkusers] Questions about planes and normals

[David.Pont at ensisjv.com]

Sawsan Ahmed <sawsanahm at yahoo.com> wrote on 21/01/2007 04:02:39:

>
> Hi Friends,
>               I posted questions but till now without any answer.May
> be those answers are too easy.But I am stuck.I am posting those
> questions again:
>
> 1) Suppose I have got a tube (of arbitrary shape),two ends of which
> are arbitrarily cut.I want to extract only those two ends.How can I do
that?

try vtkFeature edges to extract boundary edges

>
> 2)I have got a point on the surface of a tube and have calculated
> the normal at that point.Now I want to extend a line along that
> normal so that it cuts the other end on the surface of the tube and
> I want to get that point of intersection of this line with the tube
> at the other end.

I see in vtk 5 vtkBSPIntersections that might be useful here

  regards
     DP
>
> Thanks in advance.
> Sawsan
>
>
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