[vtk-developers] Re: [vtkusers] BUG in vtkClipPolyData (?)

[Bill Lorensen]

Looks like it is not fixed anymore. We'll take a look...

Bill

At 12:40 AM 10/26/00 +0200, Sebastien BARRE wrote:
>Hi
>
>A long time ago I had a discussion with Bill (or Will) regarding how to perform polygonal capping, and he drives me to :
>graphics/examplesTcl/capCow.tcl
>
>I played with that example. Then a couple of month ago I played with that example again, and it was so sloooooooooooow. But still usable, thus I did not worry about that.
>
>I checked my own code where vtkClipPolyData is used on datasets comprising 200 000 points or more.
>It was *no more* usable, it was so slow that nothing could be done interactively.
>
>I looked at my code, I checked the examples, and here it is :
>         if you use GetClippedOutput and GetOutput in the same renderer (displaying both the cut and remaining parts), then the vtkClipPolyData filter is updated nearly on each redraw :(( It is therefore impossible to move one or both parts, as the filter keep updating again and again.
>
>Open capCow.tcl or clipSphCyl.tcl and add :
>clipper SetStartMethod { puts "started" }
>
>Surprise... :)
>
>
>I check the CVS and noticed :
>Revision : 1.20
>Date : 1999/3/19 20:12:0
>Author : 'lorensen'
>State : 'Exp'
>Lines : +4 -3
>Description :
>ERR: was re-executing every time if GetClippedOutput was applied. Added Update method.
>
>Bill, are you sure it has been fixed ?
>
>Thanks
>-- 
>Sebastien BARRE
>IRCOM-SIC, UMR-CNRS 6615 - Université de Poitiers
>Bât. SP2MI, Bvd 3 - Téléport 2, BP 179 F-86960 Futuroscope Cedex
>Tel. : +33 (0)5 49 49 65 92, Fax : +33 (0)5 49 49 65 70
>http://www-sic.univ-poitiers.fr/barre/ ou  http://www.hds.utc.fr/~barre/
>
>
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