[vtkusers] vtkPointData::NullPoint

[David Doria]

I noticed a NullPoint(id) function of vtkPointData. I tried to use it like this:

// See the current points
  for(vtkIdType i = 0; i < 10; i++)
    {
    double p[3];
    polydata->GetPoint(i,p);
    std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " "
<< p[2] << std::endl;
    }

// Set one point to NULL
  polydata->GetPointData()->NullPoint(4);
  polydata->Modified();

// See the modified points
  for(vtkIdType i = 0; i < 10; i++)
    {
    double p[3];
    polydata->GetPoint(i,p);
    std::cout << "Point " << i << " : " << p[0] << " " << p[1] << " "
<< p[2] << std::endl;
    }

Nothing seemed to change with point 4, so I'm assuming this is not the
correct usage? What I am looking to do is remove a point from a
vtkPolyData without changing the point indexes of the rest of the
points. I was thinking that to do this I could use something like
NullPoint to leave the point in the data set (and hence not change the
ids) but to have it be "invisible".

Any ideas?

Thanks,

David