[vtkusers] Reverse clipping box

[Julien Finet]

Hi Chris,

You would need to look at the 2 classes: vtkGPUVolumeRayCastMapper and
vtkOpenGLGPUVolumeRayCastMapper.
Some option would need to be added to the classes to handle inside cropping
(vs outside clipping).
j.


On Sun, Apr 21, 2013 at 10:54 PM, Christopher Mullins <
christopher.mullins at kitware.com> wrote:

> Hi all,
>
> My question is probably fairly simple.  I'd like to implement something
> like a reverse clipping box.  Instead of rendering everything inside the
> box and clipping outside the box, I'd like to render what is outside the
> box and clip what is inside the box.
>
> My code is almost exactly the SmartVolumeMapper example [1].  I've been
> able to create a regular clipping box with the vtkBoxWidget, and placing
> within a callback:
>
> vtkPlanes *planes = vtkPlanes::New();
>  boxWidget->GetPlanes(planes);
> volumeMapper->SetClippingPlanes(planes);
>
> There exists a function called boxWidget->InsideOutOn();, but it appears
> this was not made with my use case in mind.  I've also tried (in the
> callback function) manually getting each plane from the boxWidget and
> reversing each normal - but this also does nothing.
>
> Does anyone have an idea of where I should look?  I've looked into
> vtkClipVolume, but I'm not sure what the point is of using this, if the
> volume mapper will accept clipping planes.
>
> Thanks for all your help,
>
> [1]
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/SmartVolumeMapper
>  --
> Christopher Mullins
> R&D Engineer
> Kitware Inc.,
> 919.869.8871
>
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