[vtkusers] Pick 2 points at the same time

[su yong]

I have picked one point from the sphere .
I want to pick two points at the same time .I means to show two different 
colors' small balls as the two picked points at the same time.
How to do it?

the code is:

  vtkPointPicker *picker = vtkPointPicker::New();
    picker->SetTolerance(0.01);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renWin);
    iren->SetPicker(picker);
    iren->SetEndPickMethod(PickCells,(void *)iren);
    iren->Start();
.......
static void PickCells(void *arg)
{
  vtkRenderWindowInteractor *iren = (vtkRenderWindowInteractor *)arg;
  vtkPointPicker *picker = (vtkPointPicker *)iren->GetPicker();
 
 sphereActor->SetPosition(picker->GetPickPosition());
  renWin->Render();
}

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