[Paraview] Filter to keep points, dropping topology

[B.W.H. van Beest]

Ah, I found it. It is the other way around:   vtkPointSet is a subclass
of vtkDataSet.
The former has SetPoints, the latter has not.
So I subclassed my filter class from vtkPointSet instead of vtkDataSet,
and it now it works.


Thanks.
Bertwim


Kind Regards,
Bertwim

On 10/22/2014 05:32 PM, Biddiscombe, John A. wrote:
> SetPoints is present in vtkDataSets that are subclasses of vtkPointSet
>
> You said you didn’t want any topology, so I didn’t think you wanted vertex
> cells.
>
> vtkSmartPointer<vtkCellArray> vertices =
> vtkSmartPointer<vtkCellArray>::New();
>     vtkIdType *cells = vertices->WritePointer(Nt, 2*Nt);
>     for (vtkIdType i=0; i<Nt; ++i)
>       {
>       cells[2*i] = 1;
>       cells[2*i+1] = i;
>       }
>     output->SetVerts(vertices);
>     }
>
>
>
>
> On 22/10/14 17:15, "B.W.H. van Beest" <bwvb at xs4all.nl> wrote:
>
>> Are you saying that one cannot have just points?
>>
>> In my case, I want to  snap the points to a structured grid,
>> but haven't done that yet, as I wanted to see the
>> points first, and do the snapping as a next step.
>> So that is not a good idea? I need to do it all in one go?
>>
>> Regards,
>> Bertwim
>>
>>
>>
>>
>>
>> On 10/22/2014 04:58 PM, Burlen Loring wrote:
>>> don't forget to add vertex type cells, or you will not be able to see
>>> the points,  and that it's going to be more complicated if you're
>>> starting from data types that have implicit points.
>>>
>>>
>>> On 10/22/2014 07:52 AM, Biddiscombe, John A. wrote:
>>>> Output->SetPoints(input->GetPoints());
>>>>
>>>> Or
>>>>
>>>> Output->CopyStructure(input);
>>>> Output->SetCells(NULL)
>>>>
>>>> Then copy point field data etc
>>>>
>>>>
>>>> On 22/10/14 16:19, "B.W.H. van Beest" <bwvb at xs4all.nl> wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I need a filter that only keeps the 3D points of a certain source
>>>>> (e.g.
>>>>> coming from  an stl file).
>>>>> The topology of the data set may go.
>>>>>
>>>>> I thought that the following filter, only passing through the
>>>>> pointdata,
>>>>> would do the job,
>>>>> but that appears not to be the case (no points after the filter!)
>>>>> What's going wrong and how should I change the filter?
>>>>>
>>>>> Kind Regards,
>>>>> Bertwim
>>>>>
>>>>> ================
>>>>>
>>>>> int FilterPoints::RequestData( vtkInformation*,
>>>>>                                              vtkInformationVector**
>>>>> inputVector,
>>>>>                                              vtkInformationVector*
>>>>> outputVector)
>>>>> {
>>>>>    // Get the input and output data objects.
>>>>>    vtkDataSet* input = vtkDataSet::GetData( inputVector[0] );
>>>>>    vtkDataSet* output = vtkDataSet::GetData( outputVector );
>>>>>
>>>>>    // output->CopyStructure( input );
>>>>>    output->GetPointData()->PassData( input->GetPointData() );
>>>>>      return 1;
>>>>> }
>>>>>
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