[vtkusers] How to find the point on the mesh closest to a specified point

[Green Hedgehog]

Hi David,
I've compiled the example. It works well, and I think it is exactly what I want. Thanks a lot for your timely reply.
 
Regards,
Yue




At 2013-11-21 21:03:04,"David Doria-2-3 [via VTK]" <ml-node+s1045678n5724550h86 at n5.nabble.com> wrote:
On Thu, Nov 21, 2013 at 7:35 AM, Green Hedgehog <[hidden email]> wrote:
> Hi all,
> There's a point outside or inside a closed surface, and I want to find a
> point on the surface which is closest to the specified point. The solution
> may not be a vertex, but just a point lying on the triangle. Currently I
> have no idea. Has anyone got any suggestions? Thanks in advance.
>
> Regards,
> Yue

I believe the FindClosestPoint function of vtkCellLocator does what
you're looking for:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/CellLocator

If you can confirm that this works directly and let me know, I'll add
notes and keywords to that example to the effect of "projecting a
point onto a mesh" and "closest point on a mesh" as this is a very
reasonable operation that has a not-so-intuitive name in VTK.

David
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