[vtkusers] Selection with vtkCompositePolyDataMapper2 mapper problem

[Utkarsh Ayachit]

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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