[Paraview] GUI

[papa ndéné NDIAYE]

great thanks Utkarsh,  I now understand how the indexes work there.
but I still don't know how to build my extractblock filter.
I mean to set the "Indices" property of the extractblock filter without
using the GUI.
I know we can get properties from vtkSMProxy::GetProperty
but I don't find a way to set them.

I thank you in advance

Papa

2011/6/29 Utkarsh Ayachit <utkarsh.ayachit at kitware.com>

> You can get access to the composite dataset information using the data
> information (vtkPVDataInformation::GetCompositeDataInformation()). To
> find the number of blocks 1 level deep, simply do:
>
> dataInfo->GetCompositeDataInformation()->GetNumberOfChildren().
>
> Determining the index for each of those children can be a little
> tricky. The index of a node is the position of that node in a
> pre-order traversal of that tree. So you the index of root is 0, while
> that of it's first child is 1. However for the second child you have
> to count the number of nodes in the entire subtree from Child0 and
> then and that to the index of Child0 i.e. ( index of left sibling +
> number of nodes in sub-tree rooted at left sibling).
>
> vtkPVCompositeDataInformation itself provides access to the data
> information of the child nodes, so using that you can traverse the
> entire composite data tree structure. You can also use
> vtkPVCompositeDataInformationIterator to traverse the tree.
> vtkPVCompositeDataInformationIterator provides a GetFlatIndex() API to
> obtain the index for any particular node.
>
> Utkarsh
>
> 2011/6/28 papa ndéné NDIAYE <pnwireframe at gmail.com>:
> > Hi all,
> >
> > I have a reader that produces a multiblock dataset and
> > want to add a GUI plug-in that applies the extract block filter
> > just changing the index to have all blocks (one level deep) extracted in
> > different objects.
> > I think about a loop calling the createfilter method of the builder with
> > "extractblock".
> > do you know how to get the number of blocks and how to set the index of
> the
> > block i want to extract without using the GUI?
> >
> > thanks!!
> >
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