VR Stereo Layers affected by PPV

Development Platform & Builds XR Development
, , , , , ,
1

Hello

I am trying to render a UI that will be attached to the HTC Vive HMD.
I started reading about Stereo layers for VR and that they would be unaffected by Camera effects and the PPV(Post processing volume).

I tried going through the Epic documentation here
I also tried this tutorial

I used the default VR scene in Unreal Engine 4 where I modified the PPV to display everything as blue. Because then i would see that the texture that i put in was unaffected. Since it had other colors in it that i could visually compare to the original. None of the approaches worked.

I have seen suggestions that suggest using a 3D widged and disabling depth test. But that doesn’t exempt it from the PPV or i am doing it wrong :slight_smile:

2

Update

I got this working ~ish with the HTC Vive headset.

  • I am not seeing the Stereo Layer in the in editor or spectator viewport. But i am seeing it in VR(Guessing this is working as intended)
  • The image is offset in -Z axis however(not working as intended)
  • The Stereo Layer VR is following the camera(working as intended)
  • The image is not affected by the PPV(working as intended)
  • The images is rendered on top of everything else(working as intended)
  • I am using the same material like in the video tutorial above and I can’t see the image but I can see the Stereo Layer VR(Working as intended)

The first part from the video tutorial is my current BP:

233207-bp-stereolayer-vr.png
233207-bp-stereolayer-vr.png1080×275 66.2 KB

What this does is that it sets the widget image to be the Stereo Layer VR image. This is working as intended i think. I will try to disconnect this and hide the widget and see if i only have to apply the image to the Stereo Layer VR for it to work.

Q: My solution to having it move with the camera is that I have attached my Stereo Layer VR actor to the camera of the Motion Controller Pawn. Is this the correct way of going it?

3
  • World Locked - The image ends up in the world where i have placed it(Working as intended)
  • Tracker Locked - The image ends up x-units below the HMD and does not rotate with the HMD(Unsure if working as intended)
  • Face Locked - The image is presented in front of the user and follows the HMD(Working as intended)

This solves it for me. The results are as i expected them to be

4

Update

  • The BP that only has a Stereo Layer VR with a image attached to it is not affected by the PPV and is in the place i assigned to it(Working as intended)
  • It does not follow the Camera because i disconnected it from the camera

My setup is now

  • No BP nodes connected only a image
  • One Pawn that is the player in VR
  • One Actor that is the Stereo Layer VR

I will now test the different modes

  • World locked
  • Tracker locked
  • Face locked