[vtkusers] Pick From vtkLineSource added to vtkAppendPolyData

[Bhanu Hariharan]

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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