Half-Life: Alyx has picked up a new trick six years after launch. Valve’s latest patch for the PC version adds an option for foveated rendering, a technique that can improve performance in VR, as spotted by PC Gamer.
The new toggle lives under Advanced Performance in the game’s settings. According to Valve’s patch notes, it lets players “enable Foveated Rendering on desktop for supported hardware (for DirectX: Nvidia GTX 16XX+, RTX 20XX+; AMD requires launching with -vulkan). Can increase rendering performance. Enable eye-tracking on your headset for best results.”
Foveated rendering works by drawing the part of the image you are looking at in full detail while lowering the detail toward the edges of your view, where your eyes are less sharp. With eye tracking, the sharp area follows your gaze, which is why Valve recommends turning that on. Valve’s documentation says the option can technically be enabled on any VR headset, but it works best paired with eye tracking, and some supported headsets need third-party drivers.
The timing is not random. Alyx had gone largely untouched since 2022, but it recently received a new port for the Steam Frame, Valve’s new headset, which runs on a Snapdragon processor and includes eye tracking. The PC patch brings part of that work back to players using PC VR headsets, so you do not need a Steam Frame to try it.
For owners of older or mid-range graphics cards, the setting could make Alyx run more smoothly or allow higher settings. Nvidia users need a GTX 16-series card or newer under DirectX, while AMD users have to launch the game with the -vulkan command.
Valve has been in the news for Half-Life a lot lately, including when a Valve composer said “HLX” out loud at GameSoundCon. This patch is a smaller story, but it is a welcome one for anyone planning to revisit City 17 in VR.
