[vtkusers] Interaction with chart on top of 3D (on top of volume rendering?)

[Elvis Stansvik]

2016-09-27 20:21 GMT+02:00 Marcus D. Hanwell <marcus.hanwell at kitware.com>:
> On Fri, Sep 23, 2016 at 1:36 AM, Elvis Stansvik
> <elvis.stansvik at orexplore.com> wrote:
>> At the moment I have a button in my Qt UI that pops up a dialog with a
>> render window containing vtkChartXY with some points items to control
>> the transfer functions I use for rendering volumes in another window.
>>
>> I've been toying with the idea of adding a VTK button (say in the
>> bottom left corner) in the window where I do the actual volume
>> rendering, and have that button bring up the vtkChartXY in the same
>> window (on top of the volume rendering), for more convenient / quick
>> access to transfer function editing.
>>
>> I had a look at this test:
>>
>>     https://github.com/Kitware/VTK/blob/master/Charts/Core/Testing/Cxx/TestChartsOn3D.cxx
>>
>> It shows a cube with a chart on top in the same renderer.
>
> Yeah, I added that.
>>
>> Would this example work if the cube instead was a volume rendering?
>
> Probably.
>>
>> Is it possible to get interaction with the chart working seamlessly
>> with interaction with the camera?
>
> No, this is something I was hoping to revisit but I could not get the
> interaction events to switch from the 2D scene to the 3D. This was my
> ideal, and what I had in mind when writing the test.
>>
>> Is there some other approach that would allow these two things?
>> Multiple renderers? Has anyone done such a thing?
>>
> Not that I know of, if they have I would love to see how they achieved
> it. I think the main obstacle is getting the interaction events to the
> 2D or 3D interactor observer depending upon where the mouse is. I
> don't think it is that hard, but we never had a project pushing for
> it. The widgets do something on this level, where they intercept the
> events when they are in an active region so that is probably a good
> place to go looking.

Alright, thanks a lot for the answers.

This idea is low on my priority list, but I thought I'd ask at least.
And now I know that in theory it's probably doable.

If someone else has gone through the trouble, please chime in :)

Elvis