[vtkusers] Pick From vtkLineSource added to vtkAppendPolyData

Alex Malyushytskyy alexmalvtk at gmail.com
Tue Sep 17 23:12:18 EDT 2013 

>> Can I then get the picker to work with vtkAppendpolydata?

Yes and No.

No , cause picker has nothing to do with vtkAppendPolydata.

I would advice you to understand which data you are working with what you
are trying to do with it, and what you get at the end.
Then everything should become clear.

Yes, cause using vtkAppendPolydata does not restrict you from assigning
global ids (or any other technique you choose ) to polydata and you still
would be able to pick cells with such ids.

For example If you assign global ids to output of all vtkLineSource(s)
(which is polydata ) , vtkAppendPolydata should path them through.
Or you can count cells generated by each vtkLineSource and then assign them
to  vtkAppendPolydata output.

I simply do not understand where in pipeline you are lost.

>> Actually that was my original question.

As far as I could understand your problem I tried to provide help..
If it does not help, it looks like I reached the point when I can't help
anymore.

So please make sure you  reply to mailing list if you want futher help..

Regards,
     Alex


On Tue, Sep 17, 2013 at 7:14 PM, Bhanu Hariharan <bhanu at petrotel.com> wrote:

> Can I then get the picker to work with vtkAppendpolydata?
> Actually that was my original question.
>
> Bhanu
> On Sep 17, 2013 3:59 PM, "Alex Malyushytskyy" <alexmalvtk at gmail.com>
> wrote:
>
>> 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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