[vtkusers] manipulating a cloud of points

[Janet Kim]

Hi Clement,

1) I believe that you can just set up a vtkPolyData so that each
    point in the cloud has a vertex.  Then just input the
    vtkPolyData to your mapper, etc.
2) If it is in 3D, you can set up a vtkBoxWidget to encase
    the points you want to select, then vtkClipPolyData
    will help you get the ids of the points inside the boxWidget.
    You can also use vtkExtractPolyDataGeometry, I think.  This
    method doesn't let the user draw a rectangle, but you can
    manipulate the pose and position of the bounding box so that
    the points you want are selected.

janet


On Thu, 20 Apr 2006, Clement Chauplannaz wrote:

> hello,
>
> I'm concerned with two issues related to cloud of points and vtk.
>
> 1) I would like to display a cloud of points, and only the points. Up to now, 
> I'm drawing a surface using the points.
> 2) I would also like to draw a rectangle with the mouse and get the ids of 
> the points inside this shape. At the moment, I'm using vtkSelectVisiblePoints 
> with a still rectangle, as I don't know if there is an easy way to allow the 
> user to draw a selection rectangle and get the pixel coordinates of the 
> rectangle.
>
> Thanks in advance
> Clément
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