[vtk-developers] Some vtkMultiVolume questions/issues

[Sankhesh Jhaveri]

Hi Andras,

The clipping issue has been fixed in !4338
<https://gitlab.kitware.com/vtk/vtk/merge_requests/4338>. A big thank you
goes to Allie.

@Elvis, I am going to look into some of the vtkMultiVolume issues next.
I’ll update here if I see the same issue you saw.

Best,
Sankhesh
​

On Wed, May 9, 2018 at 11:51 AM Andras Lasso <lasso at queensu.ca> wrote:

> Hi Sankhesh,
>
>
>
> In recent VTK versions (VTK9, OpenGL2 backend) there seems to quite
> distracting volume rendering artifact at the volume edge if there are
> opaque voxels at the volume edge and there are clipping planes outside the
> volume (which is unavoidable if you have oblique clipping planes).
>
>
>
> The problem did not occur a few months ago, then cropping was broken for a
> while, and after it was fixed we started noticing this issue. See more
> information and sample data here:
> https://issues.slicer.org/view.php?id=4548
>
>
>
> It would be great if you could look into this.
>
> Thanks a lot,
>
> Andras
>
>
>
> *From:* vtk-developers <vtk-developers-bounces at vtk.org> *On Behalf Of *Sankhesh
> Jhaveri
> *Sent:* Wednesday, May 9, 2018 8:29 AM
> *To:* Elvis Stansvik <elvis.stansvik at orexplore.com>
> *Cc:* vtkdev <vtk-developers at vtk.org>
> *Subject:* Re: [vtk-developers] Some vtkMultiVolume questions/issues
>
>
>
> Hi Elvis,
>
> Haven’t had a chance to look at vtkMultiVolume in depth yet.
> I’ll take a look at it in downtime to see if the issue is relatively
> simple.
>
> Thanks,
> Sankhesh
>
> ​
>
>
>
> On Tue, May 8, 2018 at 8:50 AM Elvis Stansvik <
> elvis.stansvik at orexplore.com> wrote:
>
> 2018-05-02 8:38 GMT+02:00 Elvis Stansvik <elvis.stansvik at orexplore.com>:
> > Hi all,
> >
> > I'm trying out the (very cool) vtkMultiVolume in VTK master.
> >
> > Performance is noticeably slower if I render two volumes added to a
> > vtkMultiVolume, than if I render the same as separate volumes in the
> > "traditional" way. Is this to be expected? (note that in this
> > particular test, my two volumes were not intersecting, so the visual
> > result in the two scenarios was exactly the same).
> >
> > I'll need to investigate more, but it seems that I can't set the
> > position of the first volume (the one set to port 0) using
> > SetPosition(..), it has no effect. Setting the position of subsequent
> > volumes (at higher port numbers) seems to work. I believe this was
> > possibly reported by another user on the users list.
>
> Update: When trying with a minimal test case, it seems I'm not able to
> reproduce this particular issue with SetPosition, so I'll have to go
> back to my code to see what I possibly did wrong there.
>
> Elvis
>
> >
> > Again I need to investigate more, but it seems
> > vtkRenderer::ResetCamera() did not quite work correctly when I had a
> > single vtkMultiVolume with a couple of volumes hooked up. It did not
> > center correctly on the two volumes.
> >
> > Just wanted to ask if these were known issues, or if I should report
> > them? If I should report them I'll try to make minimal test cases.
> >
> > Cheers,
> > Elvis
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> --
> Sankhesh Jhaveri
> *Sr. Research & Development Engineer* | Kitware
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> ​
>
-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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