[vtkusers] Distortions in Volumerendering in VR-Mode (HTC Vive)
ken.martin at kitware.com
Thu Dec 8 09:09:29 EST 2016
Not exactly related to this, but I did find a bug in our OpenVR code that I
will be pushing to a topic soon. It also includes some other performance
tweaks. The bug can have a big impact on performance as it could cause the
VR display to wait for the screen display vsync. I'll be pushing the fix
for the 7.1.1 release as well.
On Thu, Dec 8, 2016 at 8:40 AM, Sebastian Heerwald <bastiheerwald at live.de>
> Thank you for your reply.
> I have build a little program which only loads a volume dataset and
> displays it within the RenderWindow.
> Since the OpenVR interface is a little bit hackish within VTK the only
> thing that decides whether it renders for OpenVR or for normal 2D-Display
> is whether we link against vtkOpenVR and vtkRenderingOpenVR modules or not.
> Everything code related is the same.
> So to reply to your Question:
> > Could you try rendering a volume with an identity matrix set as its
> I've build this simple program and it only places a volume dataset within
> the world without any transformation. The volume is directly given to the GPUVolumeRCMapper
> without any transformation. In "2D"-Renderwindow everything is fine. Also
> in anaglyph rendering I get a nice 3D View.
> But when I link against OpenVR module the view dependend distortions
> appear within VR. I've tried some things.
> All I can say is, that the errors appear if I look at any edge or corner
> of the surrounding (invisible) boundingbox around the rendered volume. If I
> look directly on one side of the boundingbox everything seems fine.
> The only thing I can imagine from this perspective is, that the GPUVolumeRCMapper
> gets wrong view directions for the eyes. But the vtkOpenVRCamera objects
> seems to do everything right.
> I don't know how to adjust the clipping box / bounding box you mentioned.
> Can you explain how I can do this, maybe this helps me to debug further?
> *Von:* vtkusers <vtkusers-bounces at vtk.org> im Auftrag von Alvaro Sanchez <
> alvaro.sanchez at kitware.com>
> *Gesendet:* Mittwoch, 7. Dezember 2016 18:14
> *An:* polybos
> *Cc:* VTK Users
> *Betreff:* Re: [vtkusers] Distortions in Volumerendering in VR-Mode (HTC
> I have never tested the GPUVolumeRCMapper with OpenVR but as far as I
> remember Ken mentioned some time ago that he encountered a clipping/bbox
> related issue when adjusting the volume's orientation and position. Could
> you try rendering a volume with an identity matrix set as its
> transformation?, this might give you a hint of what the mapper is doing
> On Wed, Dec 7, 2016 at 11:38 AM, polybos <franz at znarfsoft.de> wrote:
>> Sebastian Heerwald wrote
>> > If I look onto the volume rendering and move around it, there appear
>> > "refraction" lines.
>> Unfortunately I cannot help with this issue but I would also be very
>> if someone could help here. Or did you, Sebastian, already achieve some
>> insights into this problem?
>> I also get such distortions on the HTC Vive when using
>> vtkVolumeRayCastMapper, while everything seems perfectly well in a
>> Does anyone have similar issues? Maybe with Occulus Rift? As far as I
>> understand Sebastian just test with a HTC Vive. At least I can only test
>> with a HTC Vive.
>> View this message in context: http://vtk.1045678.n5.nabble.c
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> Alvaro Sanchez
> Kitware, Inc.
> Senior R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4901
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Ken Martin PhD
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