[Paraview-developers] polygon selection on image under slice representation

[giavi73 at libero.it]

Hi,
i want to implement polygon selection on images under "slice" representation (because switching to "surface" representation is RAM consuming).I'm able to catch polygon point draw on interface using selectedCustomPolygon signal of pqRenderViewSelectionReaction.I'm able to select the id of image points contained in the polygon.I have two problems:1) I don't understand the correct way to create selection (vtkSelection) object starting from ids:

 vtkSmartPointer<vtkSelectionNode> selectionNode = vtkSmartPointer<vtkSelectionNode>::New();
  selectionNode->SetFieldType(vtkSelectionNode::POINT);
  selectionNode->SetContentType(vtkSelectionNode::INDICES);  selectionNode->GetProperties()->Set(vtkSelectionNode::PROCESS_ID(),????); selectionNode->GetProperties()->Set(vtkSelectionNode::SOURCE(), ????);  selectionNode->SetSelectionList(ids);

  vtkSmartPointer<vtkSelection> selection = vtkSmartPointer<vtkSelection>::New();

  selection->AddNode(selectionNode);
how can I get PROCESS_ID and SOURCE key? 
2) I don't know how to make the selection available  (set as second input) to "ExtractSelection" filter. I try with:
pqActiveObjects* actObj = &pqActiveObjects::instance();
vtkSMProxy *sourceSel = vtkSMSelectionHelper::NewSelectionSourceFromSelection(actObj->activeServer()->session(), selection, true);vtkSMSourceProxy::SafeDownCast(actObj->activeSource()->getProxy())->SetSelectionInput(0,(vtkSMSourceProxy*)sourceSel,1);
but nothing happens i.e. after selection and "ExtractSelection" invokation the widget "Copied Selection" remains empty.
Thanks,Best Regards,Vincenzo

 
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