UI3 In VR Projects

This will give you a brief overview of what is required to run the UI3 with a VR headset.

The demo project is optimised for PC and may run poorly in some VR environments. Your project needs to be performing well if you want to use it in VR!

This is not a complete guide for VR in Unreal Engine. Follow the links provided for better guides.

• The new Usage Preset - VR in the Info Map will apply a few settings that improve performance. Screen Percentage is set to 65% and the Quality is set to "Medium".
• It has to run with at least 45 or better 90 fps. The image shows 33ms. 1000ms/33ms=30 frames per second for the demo project on my laptop. That would be not good enough.
• Use the console command ~ stat unit to see what is hitting your performance. The lower the time in milliseconds the better. Green values are ok for 30 fps. Game shows blueprints and UI, which is less than 2 ms. Draw shows the time the geometry needs to be rendered per frame.
• Run other apps, preferable Unreal Engine apps to test your hardware.

VR development can be difficult, and optimization is an important skill you'll need for it. You can come a long way by

• The Default Game Settings of the sliders will be applied when the game starts. This only works in a packaged version. You can further reduce the defaults there.
• Disabling Ray-traced reflections, less bounces, or reduce reflection quality in your post process volumes.
• Using Lumen with default settings
• Using Nanite meshes especially for high polygon assets

FAQ: Debugging, Optimization, Profiling

Quick Start for Steam VR with Unreal Engine 5.4

You should see the virtual tablet next time you play your project in the editor preview with the UI items on it.

The demo project contains the level UI3_PersistentVR that is set up to be used for VR.

[ENTER] could be replaced with [SPACE] for select in some UI3 versions

If you are getting compile errors then check if the OpenXR plugin is enabled in the plugin settings.

Some headsets are not compatible with the OpenXR plugin, In this case you need to remove all Enable HDM nodes from all SDotUI3 game modes. You will need to find the node that enables your headset supplied by the plugin for your headset and connect it to the Begin Play node of the SDotUI3 GamemodeVR.