The upcoming version of Unreal Engine, 4.22, will include several new features.
The most interesting addition for our audience is probably “Early Access” support for DirectX 12 Raytracing (DXR) on DirectX 12. This includes the low-level framework to cast and evaluate rays in shaders (although they don’t clarify whether that means written shaders, nodes for graph-based shaders, or both) as well as higher-level features that use DXR, such as area lights, soft shadows, and reflections. They have also added a denoiser for shadows, reflections, and ambient occlusion, which will improve image quality with lower sample counts.
If you remember NVIDIA’s RTX announcement, many of their first-party demos were built using Unreal Engine 4. This includes the Star Wars demo with the two Stormtroopers putting their feet in their mouths on an elevator with their boss. It makes sense that Epic would be relatively far along in RTX support, especially just before GDC.
A few other additions include Visual Studio 2019 support (although Visual Studio 2017 is still the default). The new Unreal Audio Engine is now enabled by default for new projects, which was a complete re-write of the original system that started a few years ago. The old audio system was a bit of a mess, and, worse, varied from platform to platform.
Unreal Engine 4.22 also (experimentally) opts-in to the much longer file and paths names that were introduced with the Windows 10 Anniversary Update. The previous limit was 260 characters for a full path, which was defined as MAX_PATH in Win32. I’m not sure what the new limit is, but I think it’s 32,767 characters after expansion. I could be wrong, though.
If you have the Epic Launcher installed, whether it’s for Unreal Engine, Fortnite, something from the Epic Store, Unreal Tournament 4, or whatever, then you can check out Unreal Engine 4.22 for free. (Royalties apply under certain circumstances… but, at that point, you are making money off of it.)