[Paraview] Bug? - ExtractedSelection is mapped between Extracted Blocks

[Utkarsh Ayachit]

Try unchecking the "Purne Output" checkbox on the "Extract Block"
filter's Property panel. The problem is that "Prune Output" changes
the structure of the multiblock. Hence the selection defined in (3)
resolves differently after (5).

Utkarsh

On Thu, Oct 16, 2014 at 7:03 AM, redkite <redkite at virgin.net> wrote:
> Hi,
>
> I understand that objects in a vtk pipeline will be updated if something
> earlier changes, but I can see no use for this behaviour (and it's quite a
> pain to me ;). To replicate:
>
> 1) Load the can.ex2 example and apply the 'Extract Block' filter.
> 2) Navigate to the ExtractBlock/'Block indices' menu and switch on 'Unnamed
> block ID 1' so you can see the semi-circular can object.
> 3) Click the 'Select Points On' rubber-band selection button and draw a
> rectangle of points on the can.
> 4) Click the 'Extract Selection' button.
> 5) Go back to the ExtractBlock/'Block indices' menu, switch off 'Unnamed
> block ID 1' and turn on 'Unnamed block ID 2'
>
> You will see that the extracted selection is mapped to apparently arbitrary
> points in or on the second block (you may need to change opacity to see the
> mapped points). Other similar but strange behaviour occurs if you select
> across blocks and switch to view just one or a few of them.
>
> I note that if I obtain the pqSelectionManager I can clear the selection,
> but as the docs say, the selection still exists somewhere in the vtk code.
> Is there a better way to control this action?
>
> (Tested with ParaView 4.1 and Windows and Ubuntu, and 4.2 on Ubuntu.)
>
> Thanks,
> Richard
>
> ps
> I tried searching through the archives for block/selection issues and I'm a
> bit surprised not to find anything like this before.... though it may be
> related to issue raised by Robert Ainsworth ?? [so I've just cc'd this to
> him]
> (http://paraview.markmail.org/message/z4eq4hj2zerrwste?q=selection+on+blocks&page=3)
>
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