Hi Stefan,
Many thanks for looking into this. I tried to apply the VTK Depth Sorting
filter on the mesh before visualising it in the renderer, which sort of
fixed the visualisation problem but then I'm visualising the surface to
allow the user to select points/cells on the mesh. The results coming from
the VTK interactor and mouse event positions were still all over the place.
It seems that although the visualisation is fixed, the event positions
returned by the VTK interactor still struggles to find the right position
(they fall into the surface). What are your thoughts on the best approach
to tackle this? I have the same issue on two separate machines.
BW
On Wed, Oct 25, 2017 at 3:14 PM, Dinkelacker, Stefan <
[email protected]> wrote:
> Thanks for the mesh. It really seems to be something related to the
> combination of the MITK rendering window configuration and the graphics
> driver. Most of the time these kinds of rendering artifacts could be
> resolved by upgrading the graphics driver. I do not have MITK 2016.03
> installed, but with 2016.11 on Ubuntu 17.04 I can kind of reproduce the
> appearance you have from certain angles by reducing the opacity a little
> bit but I can then solve it by activating Depth Sorting for the mesh in the
> Properties View. So basically it is a deph buffer or sorting problem, which
> again is something we encountered on some computers and notebooks with
> older or open source nvidia graphics drivers compared to recent closed ones
> like the nvidia-3xy packages.
>
>
>
> Caspar could reproduce your problem with MITK 2016.03 in an Ubuntu VM but
> this is not very surprising because of the reduced OpenGL capabilities in
> such an environment. However, we also noticed that in his VM, the inner
> faces were rendered instead of the outer faces which in the first place
> reveal the artifacts (you can check this with the Backface Culling
> property). If the mesh has correct normals, it might happen in the cleaning
> step of MITK when opening a mesh.
>
>
>
> *From:* Admin Uniapp [mailto:[email protected]]
> *Sent:* Mittwoch, 25. Oktober 2017 13:51
> *To:* Goch, Caspar Jonas
> *Cc:* MITK
> *Subject:* Re: [mitk-users] VTK mesh rendering issue
>
>
>
> Hi Casper,
>
>
>
> Please have a look at the attachment. Just to remind you this issue
> happens on Ubuntu 16.04.3 LTS and with MITK 2016.03.0.
>
> Many thanks for your kind help.
>
>
>
> All the best
>
> Dora
>
>
>
> On Wed, Oct 25, 2017 at 12:42 PM, Goch, Caspar Jonas <
> [email protected]> wrote:
>
> Hi Dora,
>
>
>
> would it be possible for you to share the mesh with us? That would make
> troubleshooting easier.
>
>
>
> Best,
>
> Caspar
>
>
>
> *Von:* Admin Uniapp [mailto:[email protected]]
> *Gesendet:* Mittwoch, 25. Oktober 2017 12:59
>
>
> *An:* Goch, Caspar Jonas
> *Cc:* MITK
> *Betreff:* Re: [mitk-users] VTK mesh rendering issue
>
>
>
> Hello everyone,
>
>
>
> Can anyone please shed some light on this annoying issue? The surface mesh
> I'm trying to visualise is "not even supposed" to be transparent. It's a
> solid simple VTK mesh which has no problem rendering on a standalone VTK
> application. The rendering issue only happens within the MITK platform. As
> parts of visualisation disappears when I rotate the mesh, I can't reliably
> pick cells/points on the surface of this mesh within MITK. I notices some
> other user has reported a similar bug: https://phabricator.mitk.org/T23485
> too.
>
>
>
> Any help or hints would go a long way as I've been stuck on this for a
> while now.
>
>
>
> Many thanks
>
> Dora
>
>
>
> On Fri, Oct 20, 2017 at 1:41 PM, Admin Uniapp <[email protected]>
> wrote:
>
> Hi again,
>
>
>
> I tried to code vtkDepthSortPolyData in my application to fix the
> rendering issue (discussed before) in a custom VTK renderer I have built on
> top of MITK. The issue now I'm facing is the location of geteventposition
> (mouse locations) from the VTK interactor seems to be all over the place.
> Is there anyway to fix this rendering problem in MITK? I don't think
> enabling Depth Sorting would be a good/long term solution. Any ideas as
> always would be highly appreciated.
>
>
>
> Best wishes
>
>
>
> On Tue, Oct 17, 2017 at 11:52 AM, Admin Uniapp <[email protected]>
> wrote:
>
> Hi Caspar,
>
> Switching the opacity makes the whole mesh more opaque or transparent but
> doesn't change the strange visualisation problem. The meshes I'm testing
> are not supposed to be transparent at all.
>
> Thanks for all your help.
>
> Best wishes
>
>
>
> On Mon, Oct 16, 2017 at 12:52 PM, Goch, Caspar Jonas <
> [email protected]> wrote:
>
> Hi Dora,
>
>
>
> I know we had some issues with depth sorting for transparent surfaces over
> the years. Does your visualization change when you right click the surface
> in the data manager and switch the opacity between 1.0 and 0.99?
>
>
>
> Best,
>
> Caspar
>
>
>
> *Von:* Admin Uniapp [mailto:[email protected]]
> *Gesendet:* Montag, 16. Oktober 2017 12:44
>
>
> *An:* Goch, Caspar Jonas
> *Cc:* MITK
> *Betreff:* Re: [mitk-users] VTK mesh rendering issue
>
>
>
> Hi Caspar,
>
>
>
> Thanks for your reply. I tried to change the rendering properties and it
> seems that enabling the "Depth Sorting" option fix the problem temporarily.
> Does this give a hint what might be the underlying problem?
>
>
>
> The specs are:
>
>
>
> Ubuntu 16.04 LTS
>
> OpenGL version string: 3.0 Mesa 17.0.7
>
> Graphics: Intel HD Graphics 620 (Kabylake GT2)
>
> Processor: Intel Core i7-7600U CPU @ 2.80 GHz x 4
>
>
>
>
>
> On Mon, Oct 16, 2017 at 10:04 AM, Goch, Caspar Jonas <
> [email protected]> wrote:
>
> Hi Dora,
>
>
>
> sorry for the late reply. I am not sure what the cause might be. It seems
> to be on our side, so it might be due to specific options we set on the
> rendering context that differ from the default vtk options. It could be
> helpful to know the hardware and openGL specs for your systems.
>
> You could try changing some of the surface rendering properties to narrow
> down the culprit. (Just open the properties view and change e.g. the
> materal.Interpolation method)
>
>
>
> Best,
>
> Caspar
>
>
>
> *Von:* Admin Uniapp [mailto:[email protected]]
> *Gesendet:* Donnerstag, 5. Oktober 2017 16:47
> *An:* Goch, Caspar Jonas
> *Cc:* MITK
> *Betreff:* Re: [mitk-users] VTK mesh rendering issue
>
>
>
> Dear Casper,
>
> I just created a standalone app to visualise the same mesh with VTK alone
> and it seems fine (attached screenshot). The VTK version I used was the
> exact same as what comes with MITK 2016.3.0 super build.
>
> It appears that something in the MITK 2016.3.0 renderer window is not
> happy with my version of Ubuntu 16.04. I tested the same mesh both on a
> laptop and a desktop with Ubuntu 16.04 and they both had the same issue.
> They both have a clean newly installed version of Ubuntu. The exact same
> setup on older Ubuntu 14.04 doesn't suffer from the issue.
>
> Any ideas what I should be looking at?
>
> Many thanks as always.
>
>
>
>
>
> On Thu, Oct 5, 2017 at 10:29 AM, Goch, Caspar Jonas <
> [email protected]> wrote:
>
> Hi Dora,
>
>
>
> it might be something with the way we render surfaces. It might also be
> something with VTK itself. Could you render the surface in VTK directly and
> report whether the same thing happens there?
>
> I have opened a task for it [1]. Even if it is a VTK issue it would be
> interesting to know your laptops graphics chip.
>
>
>
> Best,
>
> Caspar
>
>
>
> [1] https://phabricator.mitk.org/T23485
>
>
>
>
>
> *Von:* Admin Uniapp [mailto:[email protected]]
> *Gesendet:* Freitag, 29. September 2017 16:25
> *An:* MITK
> *Betreff:* [mitk-users] VTK mesh rendering issue
>
>
>
> Hi everyone,
>
> I load a simple VTK mesh in MITK 2016.03 and the 3D view has issues
> rendering it properly. By rotating the mesh around half of its surface
> become transparent for no reason and you can see the other side of the
> mesh. I attached a screenshot too.
>
> This doesn't happen to me on my Linux desktop but only on the Linux Ubuntu
> laptop, so I guessed maybe there is something wrong with my graphics card
> driver but the same mesh on the same laptop renders normally on Paraview
> for instance.
>
> Any ideas?
>
> Many thanks
>
> Dora
>
>
>
>
>
>
>
>
>
>
>
>
>
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