[vtkusers] vtkPointPicker problem

[Dominik Szczerba]

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There is some tolerance in this method that you can tweek.
- - Dominik

Xavier Planes wrote:
> 
> 
> Hi to all,
> 
>  
> 
>                 I need to select a point of a vtkPolyData. This polydata
> is composed of points and lines. I’ve tried with vtkPointPicker but it
> doesn’t work for all the cases. When I click with the mouse pointer
> close to one point of the vtkPolyData it selects another point. I attach
> you a screenshot with the selected point in red and the mouse pointer is
> in the text (cellID). I modified a little bit the annotatePick.tcl.
> 
>  
> 
> http://picasaweb.google.com/xplanes78/Vtk#5327146377240066946
> 
>  
> 
>                 I think the problem is that vtkPointPicker “select a
> point by shooting a ray into a graphics window” and sometimes the ray is
> very close to another point of the 3D geometry very different from the
> one that is close to the mouse pointer in the screen. Perhaps the
> solution could be to project the geometry to the screen and find the
> closest point from the mouse pointer to the projected geometry in the
> screen (2D). What do you think?
> 
>  
> 
> Thanks!
> 
> Xavi       
> 
>  
> 
> 
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- --
Dominik Szczerba, PhD
Computational Physics Group
IT'IS Foundation for Research
www.itis.ethz.ch
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