[vtkusers] Re : Re : Click and drag a vertex of a vtkUnstructuredGrid

[R M]

Hi,

The first example 
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MoveAVertexUnstructuredGridseems
 to have no difference with the 
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MoveAVertex example.

So for the moment I use a vtkCompositeDataGeometryFilter and then use 
vtkCleanPolyData on the output of the vtkCompositeDataGeometryFilter. And it 
seems to work.

But because I have only one vtkPolyData now, I am quite block because I would 
like to hide some blocks. But, I have only one actor because only one 
vtkPolyData.

I think I will try to loop through all blocks and convert each block in a 
vtkPolyData et change the points in order to point to the global array points 
(In order to move vertices that are shared by several blocks). And, I could use 
an Actor for each polydata and make them visible or not. I don't know yet if it 
will work. It is just a test.

Thank you.




________________________________
De : David Doria <daviddoria at gmail.com>
À : R M <mlokida at yahoo.fr>
Cc : vtkusers at vtk.org
Envoyé le : Ven 12 août 2011, 16h 30min 50s
Objet : Re: [vtkusers] Re : Click and drag a vertex of a vtkUnstructuredGrid

On Thu, Aug 11, 2011 at 8:54 AM, R M <mlokida at yahoo.fr> wrote:
> Apparently not. The interaction to select points works with a
> vtkInteractorStyleTrackballActor class and it seems to only works with
> vtkPolyData.
>
> May be I should convert my unstructured grid into a polydata ?

You could use a polydata for the interaction but still update the
unstructuredGrid points:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MoveAVertexUnstructuredGrid

Or you could do the unstructuredGrid->PolyData conversion that you mentioned:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/DataSetSurfaceFilter

David
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