No Kneeboard with "VR_Mirror" option

[scuba82]

Although in VR, I'm exporting several viewports to individual monitors. To restrict the mouse pointer to the dimension of my main screen, I use the "VR-Mirror" directive. However, having this option set, Kneeboards are no longer displayed correctly in VR. When activating the Kneeboard the Kneeboards border, as well as the change page buttons are visible, but there is no content within the border. At the same time the Kneeboards is correctly displayed on my main screen (VR-Mirror). 

If you need any logs or screenshots I would be happy to help.

[tribundf]

reviving this topic, as I have the same issue and unable to solve. Has there been a solution? Attached is my VR mirror screenshot. Empty box shows in VR but no kneeboard, thats only on my main monitor

[sleighzy]

On 10/7/2024 at 12:12 PM, tribundf said:

reviving this topic, as I have the same issue and unable to solve. Has there been a solution? Attached is my VR mirror screenshot. Empty box shows in VR but no kneeboard, thats only on my main monitor

I couldn't locate what I was looking for on this topic, but you could try raising this in the OpenKneeboard Discord channel.

[scuba82]

Unfortunately I still have the same issue and no reaction so far. 

[sleighzy]

53 minutes ago, scuba82 said:

Unfortunately I still have the same issue and no reaction so far. 

No reaction in the Discord server?

[tribundf]

This is not an open knee board issue. Open knee board works fine. 
 

Im talking about the DCS  integrated knee board and with that any other overlays like control indicator, external cargo indicator, crew ROE indicator etc. 

[Farside24]

Hello, 

I have the same problem I think with the DCS integrated knee board.

Did you find how to fix this?

It appeared with the export of the left-DDI to a dedicated screen

[scuba82]

Unfortunately no, and not many seem to be  interested in this issue.  

 

[SnowTiger]

On 3/15/2025 at 9:24 AM, scuba82 said:

Unfortunately no, and not many seem to be  interested in this issue.  

 

I certainly am since I just started flying in VR with a Quest 3.
I can "sort of" resize or reshaped the kneeboard but I can't (for example) grab a corner to Scale it down or to Move it elsewhere. I also noted 2 other things that erk me a bit. One is a Ghost Outline of the Left Side/Border of the kneeboard all the way over on the Left Side of my view (outside the left window essentially). The other issue is trying to actually do anything with the kneeboard until I get looking in the right spot and get the Cursor in the right spot, and only then can I click on anything in the kneeboard .. like Change Page etc.
There most certainly is Room for Improvement.

[Ditch]

I tried to get this working today. This is my understanding of whats occurring...

When using VR in DCS, the built-in kneeboard normally appears as a 3D object on your pilot’s leg — but this breaks the moment you add exported viewports (like MFDs or RWRs) in Monitor.lua.

Here’s a breakdown of what’s going on:

1. DCS enters a hybrid rendering mode

   • The game detects that you’ve defined custom viewports (like LEFT_MFCD, RIGHT_MFCD, etc.).

   • This tells DCS to start rendering certain UI elements to 2D screens instead of to VR space — even if VR is active.

2. The kneeboard texture gets hijacked

   • Even without explicitly defining a KNEEBOARD = {} block, DCS binds the kneeboard render target to your main 2D display.

   • The 3D cockpit kneeboard (in VR) still spawns — but it has no page content, just an empty frame with buttons.

3. VR rendering of the kneeboard breaks completely

   • You’ll see the kneeboard outline in VR (arrows, page numbers), but no actual data — because the page is being rendered on your main monitor instead.

 

Just defining additional viewports (like for MFDs) is enough to break the VR kneeboard — even if you don’t touch KNEEBOARD = {}.

 

Remove all exported viewports → Native kneeboard works in VR again

Use OpenKneeboard → Full VR support regardless of monitor setup

KNEEBOARD = nil, dedicated_viewport = nil, or Lua hacks → Don’t reliably fix it due to DCS's hard-coded render logic

 

If you want working exported MFDs and a kneeboard in VR, currently the only reliable solution is to disable the native DCS kneeboard and use OpenKneeboard instead.

Ive logged a ticket:
https://www.digitalcombatsimulator.com/en/support/186988/

[SnowTiger]

But what if I have Never had any MFD's or Exported Views ?   How does this apply then ?

It seems that ultimately, the solution is OpenKneeboard.
Great .. one more thing to have to learn.  

[cmata68]

En 7/3/2025 a las 0:33, Farside24 dijo:

Hola, 

Creo que tengo el mismo problema con la placa de rodilla integrada DCS.

¿Encontraste cómo solucionar esto?

Apareció con la exportación del DDI izquierdo a una pantalla dedicada.

Good morning everyone, the same thing is happening to me. I started a thread about it. I'll see if I can fix it with some explanations from my colleagues.
Thanks everyone.