[vtkusers] Selection with vtkCompositePolyDataMapper2 mapper problem

[Alex Malyushytskyy]

I attached data set written with vtkXMLMultiBlockDataWriter
I failed to reproduce problem with ParaView myself.
But its pipeline is different as well as mapper code seems different from
vtk 6.1.0 and 6.2.0

I am trying to re-build vtk 6.2.0 with Opengl2 module enabled. Will update
when done.

On Tue, Jul 14, 2015 at 2:32 AM, Utkarsh Ayachit <
utkarsh.ayachit at kitware.com> wrote:

> Alex,
>
> Can you share the dataset (as a vtm perhaps)? I see if I can reproduce
> this with ParaView.
>
> Utkarsh
>
> On Tue, Jul 14, 2015 at 12:56 AM Alex Malyushytskyy <alexmalvtk at gmail.com>
> wrote:
>
>> I tried to debug selection and found that in :
>>
>> vtkSelection* vtkHardwareSelector::GenerateSelection( unsigned int x1,
>> unsigned int y1,
>> unsigned int x2, unsigned int y2)
>>
>> GetPixelInformation(pos, 0); already returns PixelInformation.CompositeID
>> for block which is outside selection frame as a valid
>>
>> This means that problem is either within CaptureBuffers() or
>> GetPixelInformation()
>> and possibly involves painter or mapper.
>> I afraid I will have to give up on this unless I get any suggestion which
>> may help me in finding bug location.
>>
>>
>> On Mon, Jul 13, 2015 at 5:50 PM, Alex Malyushytskyy <alexmalvtk at gmail.com
>> > wrote:
>>
>>> Attempt to upgrade to vtk-6-2-0 did not fix the problem
>>>
>>> On Fri, Jul 10, 2015 at 10:26 PM, Alex Malyushytskyy <
>>> alexmalvtk at gmail.com> wrote:
>>>
>>>> Using vtkHardwareSelector with vtkMultiBlockDataSet and vtkCompositePolyDataMapper2
>>>> sometimes is producing wrong results.
>>>> I have a vtkMultiBlockDataSet with polydata (sometimes NULL) as blocks.
>>>> On the screenshot you can see the simplest  geometry which I can
>>>> reproduce the problem on. Each rectangle there is a separate block.
>>>> It also displays window frame which supposed to define selection.
>>>> As you can see results (in red like colors) There is an extra block
>>>> selected which is totally outside of the frame.
>>>>
>>>> Relative  functions which do selection and extraction are available in
>>>> the attachment.
>>>> For some reason if I select a single component - basically by clicking
>>>> without dragging selection frame, result is always correct.
>>>> Result seems also depends on view angle.
>>>> I tracked  that wrong results appear after vtkConvertSelection::ToSelectionType
>>>> in converted to vtkSelectionNode::BLOCKS
>>>> vtkSelection.
>>>>
>>>>
>>>> I would appreciate any help or ideas.
>>>> I am using vtk-6-1-0.
>>>>
>>>> Regards,
>>>>       Alex
>>>>
>>>>
>>>>
>>>>
>>>
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