SV: [vtkusers] Compute distance between line and vtkPolyData

[John Biddiscombe]

locator->IntersectWithLine (...)
>
> Hello Che,
>
> I don't know of any way in VTK to get directly the distance between a 
> line and a vtkPolyData.
>
> However, using vtkCellLocator is pretty fast, and running its 
> FindClosestPoint method in a loop on each
>
> point along the line is probably a good solution.
>
> // Create the Cell Locator.
>
> vtkCellLocator *cellLocator = vtkCellLocator::New();
>
> cellLocator->SetDataSet(Source);
>
> cellLocator->BuildLocator();
>
> // Compute the distance d between the point m and the closest point c 
> on the surface.
>
> cellLocator->FindClosestPoint(m, c, cellId, subId, d);
>
>  
>
> Tron
>
>  
>  
> Tron Darvann
> Research Engineer, PhD, 3D-Laboratory
>  
> _Tel:_ (+45) 35 32 67 58 (lab) / (+45) 28 20 03 12 (mobile)
> _E-mail:_ trd at odont.ku.dk <mailto:trd at odont.ku.dk>
> _Skype:_ tron.darvann
> _Fax:_ (+45) 35 32 65 05
> _Mailing and Visiting Address:_
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> University of Copenhagen
> Nørre Alle 20
> DK-2200 Copenhagen N
> Denmark
>
> ------------------------------------------------------------------------
> *Fra:* vtkusers-bounces+trd=odont.ku.dk at vtk.org på vegne af Chavdar 
> Papazov
> *Sendt:* ma 13-11-2006 16:40
> *Til:* vtkusers at vtk.org
> *Emne:* [vtkusers] Compute distance between line and vtkPolyData
>
> Hi,
>
> I want to compute the distance between a straight line
> (ray) and an vtkPolyData-object.
>
> There is an obvious (but bad) solution:
> I could compute the distance between every point in
> the vtkPolyData-object and the line and then take the
> minimum, but this will be very slow...
>
> Is there a function in VTK, that does this maybe in
> some better way?
>
> Thanks a lot!
>
> Greetings,
> Che
>
>
>
>
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-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/about/BJohn.php
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82