[vtkusers] Pick From vtkLineSource added to vtkAppendPolyData

Tue Sep 17 16:59:22 EDT 2013

You do not need to convert everything, all you need is to assign unique
global ids.

Alex

On Tue, Sep 17, 2013 at 12:09 PM, Bhanu Hariharan <bhanu at petrotel.com>wrote:

> Alex,
> Thanks for your suggestion. I am now trying to convert everything (both
> grid sources and line sources) to vtkPolyData and append to
> vtkAppendPolydata.
>
> However how do I do the equivalent of
> polydata->GetCellData()->GetGlobalIds()->GetTuple1( 0 );
> for a vtkAppendPolydata.
>
> I want to recognize what object I picked from the vtkAppendPolydata.
>
> Thanks
> Bhanu
>
>
>
> On Thu, Sep 12, 2013 at 8:49 PM, Alex Malyushytskyy <alexmalvtk at gmail.com>wrote:
>
>> >> The grid cells are from vtkunstructured grid separate from the lines I
>> was talking about.
>> They are different sources. The grid cells have  global Ids and I used to
>> be able to pick using the vtkCellpicker just fine.
>>
>> vtkCellPicker works with dataset which has cell data, it knows nothing
>> about sources.
>> It does not make sense to have two, all you need is to be able to
>> recognise from the number you get which object was picked.
>>
>>
>> Polydata also has cell data
>> polydata->GetCellData()->GetGlobalIds()->GetTuple1( 0 );
>> so above line works for polydata too
>>
>> You can add ids to polydata before (from the top of my head in this case
>> all polys you combine have to have it defined , otherwise information may
>> be lost)
>> or after appending.
>>
>> Alex
>>
>>
>>
>> On Thu, Sep 12, 2013 at 5:30 PM, Bhanu Hariharan <bhanu at petrotel.com>wrote:
>>
>>> Alex,
>>>
>>> The grid cells are from vtkunstructured grid separate from the lines I
>>> was talking about.
>>> They are different sources. The grid cells have  global Ids and I used
>>> to be able to pick using the vtkCellpicker just fine.
>>> Now I want the lines added as vtkpolydata to be pickable too.
>>>
>>> I am still unclear if I can use same VTKCELLPicker (the one for grid
>>> cells added using vtkgrid) for picking both cells and the lines.
>>> I turned on the PickableOn for both actors.
>>>
>>> Regards,
>>> Bhanu
>>>
>>>
>>>
>>>
>>>
>>> On Thu, Sep 12, 2013 at 5:29 PM, Alex Malyushytskyy <
>>> alexmalvtk at gmail.com> wrote:
>>>
>>>> Bhanu,
>>>>
>>>> First of all we are talking about polydata (vtkPolyData) where your
>>>> data is stored, not grid , not vtkLineSource.
>>>> vtkLineSource is just a source which generates polydata cells which
>>>> represent the line,
>>>> but it does not matter how they were generated.
>>>>
>>>>
>>>> You  append  polydata which represent the line to existing polydata.
>>>>
>>>> If you had first polydata with 10 triangles (cells) and second with 3
>>>> lines (cells)
>>>> result of appending will have 10 triangles followed by 2 lines.
>>>>
>>>> So it is relatively easy to find out where cell data which comes from
>>>> second polydata begins (11th to 13 cells ).
>>>> But you are free to use any approach you want to recognize objects.
>>>>
>>>> For example
>>>> If you set global IDs to both polydata before appending, such  arrays
>>>> should be preserved(appended)  and you can use the same approach
>>>> If your source creates multiple cells as polydata output and you want
>>>> to be able recognize all cells as a single object you might use custom
>>>> arrays which would
>>>> help you to find the relations.
>>>> ( in above example set 1 to each cell from 1st polydata, 2 for second  )
>>>>
>>>> Hope this helps,
>>>>       Alex
>>>>
>>>>
>>>>
>>>> On Thu, Sep 12, 2013 at 8:48 AM, Bhanu Hariharan <bhanu at petrotel.com>wrote:
>>>>
>>>>> Thanks Alex. It would be very helpful if you could please clarify a
>>>>> bit more.
>>>>>
>>>>> My display already has a grid of cells and a vtkCellPicker to pick
>>>>> cells in the grid. And I use Picker->GetCellId() to get the cell picked. I
>>>>> map the cell id returned using Picker->GetCellId() to a global cell id
>>>>> using something like
>>>>>
>>>>> pickerdataset->GetCellData()->GetGlobalIds()->GetTuple1(m_pidCellID);
>>>>>
>>>>>
>>>>> In the same display I also have Multiple Lines added first to
>>>>> vtkPolydata using
>>>>>
>>>>> do for each Line
>>>>>
>>>>>           ids->InsertId( linenumber, someId);
>>>>>            Lines->InsertNextCell (ids);
>>>>>
>>>>>            mypolydata->SetPoints(mypoints);
>>>>>            mypolydata->SetLines(Lines);  //Lines is the vtkCellArray
>>>>>
>>>>>            myAppendPolyData->AddInput (mypolydata);
>>>>> end do
>>>>>
>>>>> mymapper ->SetInput( myAppendPolyData->GetOutput());
>>>>>
>>>>>
>>>>> My question is
>>>>> 1. Can I use the same vtkCellPicker to pick both grid cells and Lines
>>>>> or should I declare 2 different vtkCellPickers
>>>>> Picker1 and Picker 2 .
>>>>>
>>>>> 2. Will the Picker for Lines be used the same WAY as Picker for grid
>>>>> cells.
>>>>> That is Can I do Picker->GetCellIId to get the Line Number? And then
>>>>> map to back to some Global Line ID?
>>>>>
>>>>>
>>>>> Thanks for your patience and I look forward to your suggestion.
>>>>>
>>>>> Bhanu
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wed, Sep 11, 2013 at 7:46 PM, Alex Malyushytskyy <
>>>>> alexmalvtk at gmail.com> wrote:
>>>>>
>>>>>>
>>>>>> vtkPropPicker works only with actors.
>>>>>> vtkCellPicker will allow you to identify which cell was picked  in
>>>>>> polydata
>>>>>>
>>>>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Picking/CellPicking
>>>>>>
>>>>>>
>>>>>> Alex
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Sep 11, 2013 at 9:50 AM, Bhanu Hariharan <bhanu at petrotel.com>wrote:
>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>>
>>>>>>> I was wondering if someone can help me on how to pick Lines added to
>>>>>>> a vtkAppendPolyData.
>>>>>>> before adding to Mapper and Actor.
>>>>>>>
>>>>>>> I saw some example where a linesource was added directly to Mapper
>>>>>>> and Actor.
>>>>>>>
>>>>>>> But I have several lines and having an actor for each one will slow
>>>>>>> things down considerably. So I use vtkAppendPolyData and add all line
>>>>>>> sources to it. I then pass the vtkAppendPolyData thorugh a vtktransform and
>>>>>>> vtktube filter before adding to mapper and actor.
>>>>>>>
>>>>>>> Can someone please tell me if its possible to use vtkPropPicker or
>>>>>>> VtkPicker with vtkAppendPolyData.
>>>>>>> Also once picked how can I tell which line was picked. Can I assign
>>>>>>> a global Id to each line?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Bhanu
>>>>>>>
>>>>>>>
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