[vtkusers] VTK OpenVR issue and questions

Ken Martin ken.martin at kitware.com
Thu Oct 5 09:03:15 EDT 2017

For (1) Make sure you set yourRenderWindow->SetMultiSamples(0) before the
first render,  that could be the issue. Not sure about flickering and
lagging but if you have a nvidia card make sure you open the nvidia control
panel and set your preferred graphics processor to be the high performance
nvidia processor and set vertical sync to Off (I forget which it is). Apply
those settings and then try again.

2) the clipping should clip whatever is in the scene. Changing it to clip
only some actors is not supported. You would need to look at the code in
vtkOpenVRInteractorStyle.cxx and see how we do the clipping and then use
similar logic in your code.

On Thu, Oct 5, 2017 at 7:52 AM, Denis Ducreux <denis.ducreux at icloud.com>

> Hi,
> I’m quite new to VTK coding ; I downloaded and compiled the last git
> master version and I would like to know :
> 1- When using Volume Rendering (such as in Medical4 example) in OpenVR, no
> volume is displayed at all in the VR Headset. When I try to add for example
> legacy .vtk files (in polydata) to the scene, the whole rendering is
> flickering, and the volume rendering is not displayed, but the polydata are
> displayed with flickering and lagging.
> 2- When using the OpenVR rendering, it is possible to clip the whole scene
> (choice from user’s menu).
> How could I :
>         2.1 - Map a slice from an ImageData Volume to the clipped scene ?
>         2.2 - I have a data volume (binary raw, displayed after marching
> cube) and a polydata file (legacy .vtk) ; I would like to clip the volume
> only, not the poly data inside the OpenVR rendering.How could I do this ?
> Thanks for your help :-)
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Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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