Unreal Engine 4 Integration

| Published 2019-10-09

Unreal Engine 4 Integration - 1.41

These release notes describe changes to the Unreal Engine 4.23 source distribution available from the Oculus GitHub repository.

All versions of Unreal 4.10 and later include built-in support for Oculus Rift and Samsung Gear VR, including automatic stereoscopic rendering and tracking. Oculus Go support is included in Unreal 4.19 and later.

For more information, see our Unreal Engine Developer Guide.

Oculus Source Distribution

The following distributions of the Unreal Engine source code include the latest SDK and provide the most recent features. Access requires a GitHub account subscribed to the private EpicGames/UnrealEngine repository (instructions here).

Note: To access the files on GitHub, you must be logged into a subscribed account, otherwise you will get a 404 error when accessing the following link.

Unreal Source Distribution

The standard Epic source distribution hosted on GitHub is typically about a month behind the Oculus branch in feature support. Access requires a GitHub account subscribed to the private EpicGames/UnrealEngine repository (instructions here).

Note: To access the files on GitHub, you must be logged into a subscribed account, otherwise you will get a 404 error when accessing the following link.

Unreal Engine Binary

For beginning or casual developers, we recommend the Unreal Engine binary available through Epic’s Launcher.

For more information on the differences between different Unreal options and how to access them, see the Version Compatibility Matrix in our Developer Guide.

New Features

  • Enabled late-latching on Quest + Vulkan. This feature can can reduce rendering latency by up to 1 frame. To enable late latching, check the LateLatching checkbox under OculusVR plugin settings.

Integration Changes

  • Updated the Oculus Unreal Integration to 1.41.
  • Updated the Platform SDK integration to 1.40.
  • Updated the Audio SDK integration to 1.41.

API Changes

  • None

Bug Fixes

  • Fixed a controller-updating race condition, which could cause controller movement hiccups if the app hit the FPS target.
  • Fixed a Dash depth compositing issue on UE 4.23.
  • Fixed a pipeline state cache bug under Multiview, which can cause memory leaks and render-thread slow down.

Known Issues

  • A significant drop in frame rate occurs when UE4 is not in focus in VR preview mode. To avoid this issue, uncheck the Use Less CPU when in Background in Edit > Editor Preferences > General (left sidebar) > Miscellaneous (left sidebar) > Performance.
  • Exclusive Mode issues: Setting the mirror window to full-screen exclusive mode will not work correctly if the monitor and HMD are connected to different GPUs.