How to get access to existing vtkSMRenderViewProxy?

Development
1

Hello dear developers!

Could you explain me please, how to get access to vtkSMRenderViewProxy in order to invoke points selection from a custom widget?

Best regards

2

Hi,

From where ? from a pq class ?

Best,

3

Nice to see you Mathieu,

Yes, I am trying to add a new widget, following the tutorial, it is a subclass of pqPropertyWidget following the prototype:
ClassName(vtkSMProxy *smproxy, vtkSMProperty *smproperty, QWidget *parentObject=0)

I am trying to make some points of the dataset selected.
Unfortunately, if I use vtkPythonInteractiveInterpreter, something is triggered and RequestData is called in my filter, which is not desirable due to long time the computation takes.

from paraview.selection import *
SelectIDs(IDs=[0, 1], FieldType='CELL')

I was trying to found the way to do the same in C++, and the closest thing I found was
vtkSMRenderViewProxy::SelectSurfacePoints , but I dont know how to get access to it from the widget

If you could tell me how to make points selected by their IDs with C++ means only, I would be very happy.

I would appreciate your advice very much

Thanks for your reply!

4

from a pq class, you can access to vtkSMRenderViewProxy using pqRenderView::getRenderViewProxy

https://kitware.github.io/paraview-docs/latest/cxx/classpqRenderView.html#a9ae103dbd51507809f3d37b00a2a1cf8

5

Thank you!

Is there a class that allows to select points by ID, not by region?

6

Mathieu, could you please clarify how to create an instance of pqRenderView from the widget?

7

Usually you use an already existing view

Is there a class that allows to select points by ID, not by region?

Then you do not want to use this API, but you want to create a SelectionSourceProxy directly.

8

If I got right what you said, you referred to the vtkSMSelectionHelper
I have tried the following:

  vtkSelection* sel = vtkSelection::New();
  vtkNew<vtkIdTypeArray> ids;
  ids->SetNumberOfComponents(1);

  for (unsigned int i = 0; i < 500; i++)
  {
      ids->InsertNextValue(i);
  }
  vtkNew<vtkSelectionNode> selectionNode;
  selectionNode->SetFieldType(vtkSelectionNode::POINT);
  selectionNode->SetContentType(vtkSelectionNode::INDICES);
  selectionNode->SetSelectionList(ids);
  sel->AddNode(selectionNode);


  vtkSMProxy* selproxy = vtkSMSelectionHelper::NewSelectionSourceFromSelection(given_proxy->GetSession(), sel);


  vtkClientServerStream stream;
  stream << vtkClientServerStream::Invoke << VTKOBJECT(selproxy) << "AddGlobalID" << 1770 << vtkClientServerStream::End;

  vtkSMSession*  session = selproxy->GetSession();

  session->ExecuteStream(selproxy->GetLocation(), stream, false);

It throws no errors, but sadly enough, it does not select any cells

Could you help me understanding what s wrong here please?

Best regards