[vtkusers] Distortions in Volumerendering in VR-Mode (HTC Vive)
ken.martin at kitware.com
Tue Jan 10 13:31:58 EST 2017
I'm working on a Volume Rendering VR example right now so I'll see if I
bump into the same issue.
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 <(518)%20881-4901>
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