Need advices about Pimax Crystal Light settings with DCS (yes, another one...)

[Osirith]

Hi all,

I just bought a brand new Pimax Crystal Light to replace my HP Reverb G2, and I am a bit struggling with the settings, between PimaxPlay, OpenXR in game settings, DCS, ...

 

So I have a few questions below, thanks for your help !

My PC : Windows 11, Intel i9-10900K, 32 Gb RAM, nVidia RTX 3090

1. Frequency / FPS
   • PimaxPlay : 90 Hz Refresh Rate, half-framerate set to OFF
   • DCS : Max FPS set to 45
      
   • Question : is it the right wait to do, or better to set Half-framerate to ON in PimaxPlay and Max FPS to 90 in DCS ?
      
2. Upscaling / Quality
   • PimaxPlay :
     • Image Quality : 0.75 (Medium)
     • GPU Upscaling : None (I guess that 0.75 Image Quality is already upscaling ???)
     • Sharpness : 0.4 
   • DCS :
     • Pixel Density : 1.0
        
3. Foveated View : I am trying to use QuadViews :
   • PimaxPlay :
     • Quadviews settings : Balanced
     • Pimax Central Priority Rendering : Balanced
   • DCS :
     • Use QuadViews : OFF
     • Eye Tracking : OFF
       
   • Question : if I try to set Use Quadviews : ON in DCS, I have no image in the helmet (only the single image copy on main monitor)
     • Am I setting this correctly ?

Thanks for your help on my questions, and if you have any advice about my overall set-up of parameters, feel free to reply

 

Chris

[Moxica]

When you activate QuadViews in DCS, do you also activate Eye tracking? (If you do, don't) 

Edited September 17 by Moxica

[Glide]

23 minutes ago, Osirith said:

Question : is it the right wait to do, or better to set Half-framerate to ON in PimaxPlay and Max FPS to 90 in DCS ?

OpenXR should manage this for you.  If you can't achieve 90, it should set your FPS to 45.  It doesn't hurt to set it to 45, but I like to let OpenXR manage this.

I would let DCS do all of the image quality settings.  So set the headset to 100%.  With a 3090 you shouldn't need quadviews at all.  Some feel the need for higher FPS, but I personally can see the screen artifacts from quadviews, so I leave it off.  If openxr gives you 45fps, and you are not stable, you can enable quadviews in DCS.

Edited September 17 by Glide

[Osirith]

2 minutes ago, Moxica said:

When you activate QuadViews in DCS, do you also activate Eye tracking? (If you do, don't) 

I have tried with and without Eye Tracking setting in DCS, same result : no DCS image in PCL, only the PimaxPlay "Cosmos" background.

However, it seems I have a foveated rendering without selecting Use QuadViews in DCS, if I set Quadviews Setting (and Central Priority Rendering ?) in PimaxPlay.

Just now, Glide said:

OpenXR should manage this for you.  If you can't achieve 90, it should set your FPS to 45.  It doesn't hurt to set it to 45, but I like to let OpenXR manage this.

Thanks. In oder to do that, which parameters do I set in PimaxPlay, and in DCS ?

[Glide]

15 minutes ago, Osirith said:

In oder to do that, which parameters do I set in PimaxPlay, and in DCS ?

OpenXR takes care of itself.  No additional settings required.  Leave pixel density at 1.0 in the DCS settings. You should have excellent results with everything at 100%.  The Crystal Light is plenty sharp.  Less is more, that's my VR motto, so don't add things unless you feel you need them.

I don't think the Light has eye tracking.  Quadviews gives you FIXED foveated rendering.  

Edited September 17 by Glide

[Osirith]

11 minutes ago, Glide said:

OpenXR takes care of itself.  No additional settings required.  Leave pixel density at 1.0 in the DCS settings. You should have excellent results with everything at 100%.  The Crystal Light is plenty sharp.  Less is more, that's my VR motto, so don't add things unless you feel you need them.

I don't think the Light has eye tracking.  

PCL has no Eye Tracking, yes.

 

Ok. So to be sure : no Max FPS in DCS, and I just choose 90Hz in PimaxPlay ? and OpenXR will decrease the FPS if needed ? 
Not sure how it will choose the best max FPS.

Edited September 17 by Osirith

[Glide]

That is correct.  OpenXR has it's own algorithm.  You can read the OpenXR spec in your spare time. 

The key is to ensure it doesn't fluctuate lower.  If you find it is dropping down below 30fps all the time, then you need to tune your settings.  If it's stable at 45 all the time, you are golden.  If it goes higher, bonus.

[Osirith]

I have just set right now :

• PimaxPlay :
  • Image Quality to HIGH (I guess, no upscaling, 1:1 image)
  • QuadView : Unchecked
  • Central Priority Rendering : Unchecked
  • Frequency : 90 Hz
     
• DCS :
  • Max FPS : 90

On launch (on SuperCarrier deck with F18), I got around 32-34 FPS. After launch, it fluctuates from 29 to 34 FPS (above sea, guess it will be lower above ground)

Image is superb but I guess it is a bit too low FPS.

Guess I need to choose the best setting to increase FPS without reducing quality too much. Image Quality in Pimax ? Upscaling in Pimax ? Quadviews / Foveating options ?

Edited September 17 by Osirith

[Glide]

Quadviews in DCS will give a big boost.  Try that first.  It's important to only change one thing at a time now, so you don't get tangled up in knots.

Edited September 17 by Glide

[Blackhawk163]

Just use TallyMouse's YouTube video suggestions for DCS in VR. It's a very well done video and has a great breakdown on how to achieve a right balance of visuals and performance. I can't recommend it enough.

[Peedee]

On 9/17/2025 at 2:58 PM, Osirith said:

 

1. Foveated View : I am trying to use QuadViews :
   • PimaxPlay :
     • Quadviews settings : Balanced
     • Pimax Central Priority Rendering : Balanced
   • DCS :
     • Use QuadViews : OFF
     • Eye Tracking : OFF
   • Question : if I try to set Use Quadviews : ON in DCS, I have no image in the helmet (only the single image copy on main monitor)
     • Am I setting this correctly ?

Chris

 

No image with Quad views? Try disabling Open XR Toolkit if you have that installed. 

Here’s a word from the guy who made both:

Not sure if this helps you. Worth a try?

And I am sorry to say that with your cpu and gpu you will have to make rather big compromises to get DCS run well on the Crystal Light. By running well I mean either stable over 72fps using 72hz in the headset or 90fps in 90hz mode. But it should be possible to get it run a bit better than now anyway. The Tallymouse video mentioned is also good.