[vtkusers] Pick From vtkLineSource added to vtkAppendPolyData

Bhanu Hariharan bhanu at petrotel.com
Thu Sep 12 20:30:12 EDT 2013 

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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