[vtkusers] Rendering of vtkGPUVolumeRayCastMapper with AddClippingPlane

[Tijmen Klein]

I am using a vtkGPUVolumeRayCastMapper to render a structured grid, with the
use of AddClippingPlane member (of vtkGPUVolumeRayCastMapper). Now, I'm
getting some weird rendering behavior that depends on the interactor that is
used:

*vtkInteractorStyleTrackballActor:  *Rendering sometimes looks good, but
most of the time weird rendering artifacts show when doing this. This is how
it should look: http://dl.dropbox.com/u/27566470/good.png, but most of the
time it looks like something like this:
http://dl.dropbox.com/u/27566470/bad.png or
http://dl.dropbox.com/u/27566470/bad2.png These artifacts change based on
the rotation that is applied with the interactor.
*
*
*vtkInteractorStyleTrackballCamera:  *When I start with this interactor, the
clipping is not applied at all. I just see the normal volume (without
rendering artifacts). If I start with the Actor Interactor (and try to get a
view without artifacts), and then switch to the Camera Interactor: then
everything seems to be working fine. The view stays clipped, and no
artifacts occur. But I can not get it to work with just the Camera
Interactor. However, I would prefer to use the Actor Interactor for my
interactions, so switching to Camera mode is not really wanted.

Are this known issues? What am I doing wrong that the clipping is not
happening in Camera mode? And is there a way to prevent the artifacts?


Tijmen
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