[vtkusers] Problems using vtkGenericClip

[David Thompson]

> Hi everybody... I need some help...
>
> I have an unstructured grid called 'grid' and i want to extract some
> points using the vtkGenericClip function.

Hi Luca,

You need to use vtkClipDataSet not vtkGenericClip. vtkGenericClip  
inherits vtkUnstructuredGridAlgorithm because it *outputs*  
unstructured grids, not because it takes them as input. Also, as Bill  
Lorensen pointed out, you may need to set a clip value.

	David

> As clip fuction i used a
> vtkSphere object... this is the code i wrote:
>
> 	sphere = vtkSphere()
>        sphere.SetCenter(x_coord, y_coord, z_coord)
>        sphere.SetRadius(radius)
>
>        cutter = vtkGenericClip()
>        cutter.SetClipFunction(sphere)
>        cutter.SetInsideOut(0)
>        cutter.SetInput(grid)
>        cutter.Update()
>
>        smallgrid = cutter.GetOutput()
>        smallgrid.Update()
>
> 	
> after that 'cutter.GetNumberOfPoints()' always gives me 0 as result!!
> i cannot understend why...
> coordinates and radius of sphere are correctly set...
> 'smallgrid' object is an unstructured grid object as expected...
>
>
> thank you!!
>
>
>
> -- 
> ---------------------------
> Luca Penasa
> Student at Geosciences Dpt.
> University of Padua (IT)
> luca.penasa at email.it
> ---------------------------
>
>
>
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