[vtkusers] Rendering of vtkGPUVolumeRayCastMapper with AddClippingPlane

[Tijmen Klein]

Done: http://www.vtk.org/Bug/view.php?id=12377

On Mon, Jul 18, 2011 at 7:28 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Tijmen,
>
> You should submit a bug report for this, otherwise it will just get
> lost on the mailing list:
> http://www.vtk.org/Bug/view_all_bug_page.php
>
> I've seen similar problems with the vtkGPUVolumeRayCastMapper
> but never took the time to analyze them.  For me, the issue was that
> the rendering was incorrect if the clipping planes were used together
> with a cropping region.  Your issue, where the rendering is different
> depending on whether an actor transform is used versus whether a
> camera transform is used, produces the same sort of rendering
> artifacts that I was seeing i.e. huge chunks of the volume are
> missing.
>
>  - David
>
>
> On Mon, Jul 18, 2011 at 6:03 AM, Tijmen Klein <T.R.Klein at student.rug.nl>
> wrote:
> > 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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