NVIDIA has revealed that CD Projekt Red’s next blockbuster, The Witcher 4, will take advantage of an updated version of RTX Mega Geometry, a rendering technology designed to increase frame rates while also reducing VRAM usage. For players, that combination matters: smoother performance, fewer memory bottlenecks, and more room for higher-quality assets in complex scenes.
RTX Mega Geometry arrived alongside NVIDIA’s RTX 50-series GPUs built on the Blackwell architecture. At its core, the tech tackles one of the biggest performance challenges in modern games: sheer geometric complexity. Today’s worlds aren’t made of a few large shapes; they’re built from millions upon millions of triangles spread across tens of thousands of objects in every scene. RTX Mega Geometry groups these triangles into clusters, compresses them, and then caches them across multiple frames. As you move through the world, the system can intelligently reuse what’s already been processed instead of rebuilding everything from scratch each moment. The result is a more efficient way to handle dense, detailed environments.
One of the key promises here is enabling advanced geometry systems like Unreal Engine 5’s Nanite to work with path tracing in a more complete, “no compromises” way. In simple terms, it aims to deliver extremely detailed meshes with fully path-traced lighting, without having to fall back on traditional rasterization shortcuts that can limit realism or consistency.
NVIDIA previously demonstrated the concept with its Zorah tech demo, showcasing scenes with around half a billion triangles. With RTX Mega Geometry enabled, that demo showed noticeably richer detail and a fluid feel on RTX 50 hardware. While the feature is intended to run across RTX GPUs in general, Blackwell includes specific improvements that can accelerate it further.
Real-world adoption is already underway. The technology first appeared in Alan Wake 2 through integration into Remedy’s Northlight Engine, where it reportedly delivered a 5–20% FPS increase while also saving around 300 MB of VRAM. Remedy is also set to use the same approach in its upcoming Control spin-off Control Resonant, which is confirmed to include DLSS 4.5 and path tracing support.
The standout announcement, though, is The Witcher 4. CD Projekt Red is integrating a next-generation version of RTX Mega Geometry, and that choice makes a lot of sense given what the studio is building. Like previous Witcher games, the new entry is expected to feature a massive open world, and early showcases point to dense, lush forest environments. If the game leans heavily into ray tracing and path tracing, forests are one of the toughest things to render well. Foliage is famously difficult because of its extreme depth and geometric detail—countless leaves, branches, and overlapping layers that rays of light need to interact with realistically.
Historically, games often solved this by reducing geometric detail in foliage, but that comes at a clear cost to visual fidelity. The Witcher 4 aims to avoid that compromise by pairing RTX Mega Geometry with a new, in-development foliage system and another NVIDIA technique called Opacity Micromaps.
Here’s how that combination helps. RTX Mega Geometry can partition the top-level ray-tracing structure and selectively update only the partitions that matter most each frame, so the system avoids needlessly recalculating the entire scene. Opacity Micromaps help rays move through complex partially transparent objects—like clusters of leaves—more efficiently. Together, these techniques are meant to make high-fidelity, path-traced forest scenes run at performance levels suitable for real gameplay, not just showcases.
In the demo example tied to this announcement, viewers get an aerial drone-like perspective over an extremely dense forest filled with millions of high-detail objects. The emphasis is on scale and consistency: accurate lighting and shadowing not only close up, but also across long distances, where many games tend to simplify detail.
If this integration delivers on its promise, The Witcher 4 could become one of the most important showcases for next-generation ray tracing in open-world games—especially in the exact kinds of environments that usually force developers to choose between performance and realism.
