[vtk-developers] vtkPicker picking "visible" parts of assemblies marked as invisible

[Steve Pieper]

Hi Rostislav -

Yes, this is a nasty issue introduced by the vtkPickeringManager.  I ran
into this last year [1] and put a workaround in our version of VTK [2] but
it doesn't solve the whole problem.  I didn't propose this back to
VTK-proper because widget needs to be fixed in order for this to work.
Maybe there's a better way?

The bug report includes simple instructions on how to reproduce the issue.

-Steve

[1] http://na-mic.org/Bug/view.php?id=3808

[2]
https://github.com/Slicer/VTK/commit/539b56d2334cf292d3fbfc18cef9543a56fb9362

On Thu, May 21, 2015 at 12:22 PM, Rostislav Khlebnikov <
rostislav.khlebnikov at kcl.ac.uk> wrote:

> Dear VTK developers,
>
> I am using vtkCellPicker (and consequently vtkPicker) to pick cells on
> objects. However, apparently, if a prop assembly is marked as invisible, it
> is still possible to pick the parts of assembly marked invisible if these
> parts are not explicitly marked invisible themselves. This happens in case
> a pick list is used, i.e. line vtkPicker.cxx:L278 is executed (not sure
> whether the same would happen if pick lists are not used). In any case,
> checking whether prop obtained in line 294 of vtkPicker.cxx is visible and
> pickable before initializing path traversal, should fix the problem.
>
> So my question is:
>   - is it supposed to behave like this? (I doubt it as it is rather
> unintuitive)
>   - should I make a fix for this?
>     - If yes - is it possible to make such a small fix (probably two lines
> of code) in some simple way?
>
> All best,
>    Rostislav.
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