[vtkusers] How to use OpenVR overlay with VTK ?

[Ken Martin]

Yes vtkOpenVROverlay is intended to be a dashboard overlay. Using Qt to
create the texture for an overlay (per the OpenVR SDK example) seems like a
fine idea. Not sure why you are running into issues as long as you keep the
thread/context boundaries clean. I have not tried that approach personally
but I think it is a fine way to go.

Thanks
Ken

On Fri, May 19, 2017 at 11:49 AM, liyang lin <linlycode at gmail.com> wrote:

> Hi, I have a simple Virtual Reality app that uses VTK for visualization,
> and I'm trying to make GUI using OpenVR overlay but can't get it working.
>
> I tried to use two threads to do the job, In the main thread, I set up
> OpenVRRenderWindow, renderer and interactor, and starts the interactor;
> In the overlay thread, I create an OpenVR overlay and an OpenGL context
> that associated with a Qt offscreen surface, then render a Qt widget into a
> framebuffer object in the OpenGL context, then extract the texture from the
> framebuffer object, and feed it into the overlay using setOverlayTexture.
> The second thread also listens for OpenVR overlayShown, mouse move/up/down
> event, and dispatch them to the widget.
>
> The overlay appears as expected, but the 3D scene rendered by VTK is
> problematic, scene in the left eye flashes and doesn't react to HMD
> movement, and when I points the controller to the overlay(which cause
> rerender of the widget, and a setOverlayTexture call), the scene just
> disappears.
>
> I have no idea why this happens since I use my own OpenGL context in the
> overlay thread, why is the scene rendered by VTK is affected ?
>
> I also looked into vtkOpenVROverlay, it seems that it's a dashboard
> overlay and hard to be reused.
>
> Anybody know how to create GUI in VTK with OpenVR ?
>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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