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<p><tt>Sawsan Ahmed <sawsanahm@yahoo.com></tt><tt> wrote on 20/12/2006 04:21:07:<br>
</tt><br>
<tt>> Hi friends,</tt><br>
<tt>> Thank u very much for giving me guidance.But I have <br>
> one silly question to ask.When we r generating surface normals,<br>
> should not be the normals of the cells or point normals or both give<br>
> more or less the same result?</tt><br>
<br>
<tt>In general yes, depends how you are generating them, for example vtkPolyDataNormals has a few settings that can strongly alter the end result.</tt><br>
<tt> Dave P</tt><br>
<br>
<tt>> </tt><br>
<tt>> Again thanks in advance.</tt><br>
<tt>> </tt><br>
<tt>> Sawsan.<br>
> <br>
> David.Pont@ensisjv.com wrote:</tt><br>
<tt>> Sawsan Ahmed <sawsanahm@yahoo.com> wrote on 18/12/2006 20:20:50:<br>
> <br>
> > Hello Friends,<br>
> > I want to get a plane which cuts an object of <br>
> > arbitrary shape perpendicularly along the surface.Could anyone give <br>
> > me any idea?<br>
> > Thanks in advance.<br>
> > <br>
> > Sawsan<br>
> <br>
> Hi Sawsan,<br>
> vtkOBBTree has a member function ComputeOBB. Perhaps you can use <br>
> the outputs from this to determine the location and orientation of <br>
> the longest axis. This information could then be used to locate and <br>
> orient a plane: vtkPlane and vtkClipPolyData or vtkCutter can then <br>
> be used to clip or cut.<br>
> <br>
> hope that helps, Dave P</tt><br>
<tt>> <br>
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