NVIDIA RTX Mega Geometry is a developer-integrated system for handling the dense, detailed geometry that ray tracing must traverse. It organizes geometry into clusters and uses techniques such as streaming, level of detail, caching and on-the-fly tessellation to help manage ray-tracing acceleration structures. It is not a player-side setting that adds support to any game: the game itself must implement it.
What RTX Mega Geometry does
Ray tracing checks rays against scene geometry. To make those checks more efficient, engines typically organize scene data in acceleration structures such as bounding volume hierarchies (BVHs). Highly detailed geometry—and geometry that changes—can make building or updating those structures expensive.
Mega Geometry groups detailed geometry into clusters and provides ways to reuse, stream or update those clusters as the scene is traversed. The intended benefit is to make complex ray-traced scenes more manageable without requiring developers to treat every triangle as a separate, constantly rebuilt unit. NVIDIA describes the technology as enabling detailed, full-fidelity path tracing and real-time tessellation. NVIDIA’s GDC announcement
How the SDK handles geometry
NVIDIA’s DX12 and Vulkan SDK sample demonstrates two approaches. Developers can use either path or combine them in a scene. The RTX Mega Geometry SDK repository
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Cluster LOD: stream pre-built detail as needed
Cluster LOD uses a continuous hierarchy of pre-baked triangle clusters. The system selects an appropriate level of detail and streams clusters into VRAM as needed, rather than keeping every level of every asset resident at once.
Cluster Tessellation: generate detail at runtime
Cluster Tessellation adaptively tessellates and displaces Catmull–Clark subdivision surfaces on the fly, then rebuilds the relevant acceleration structure. This gives developers a way to generate detailed geometry dynamically instead of relying only on pre-baked triangle data.
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The SDK’s Zorah sample scene contains 1.6 billion unique triangles and 18.9 billion instanced triangles. NVIDIA lists a 70 GB download and says the sample’s first-load bake can peak at 64 GB of RAM. Those figures describe the sample assets and its processing needs—not the memory requirements of a game using Mega Geometry. NVIDIA’s SDK page
What the performance claims mean
NVIDIA says Mega Geometry can build ray-tracing structures up to 100 times faster than previous methods. That is a claim about structure-building speed, not a promise of 100 times more frames per second. A faster build may help an engine manage detailed or changing geometry, but the effect on a player’s frame rate depends on the game and its implementation. NVIDIA’s GDC announcement
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In a March 2026 announcement, NVIDIA reported that Remedy’s application of Mega Geometry to existing Alan Wake 2 assets produced a 5–20% FPS boost and used 300 MB less VRAM. The cited announcement does not specify test hardware, resolution, settings or methodology, so those figures should be read as NVIDIA’s reported Alan Wake 2 results—not as a typical gain for other games or GPUs. NVIDIA’s GDC announcement
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Remedy said its January 30, 2025 PC update made Alan Wake 2 the first game to feature RTX Mega Geometry, with the feature available on GeForce RTX GPUs and laptops. The same update added DLSS 4 and an Ultra ray-tracing preset, so not every visual or performance change in that update can be attributed to Mega Geometry. Remedy’s Alan Wake 2 update announcement
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NVIDIA’s architecture document lists support for RTX GPUs starting with Turing, alongside DirectX 12 through NVAPI, Vulkan vendor extensions and native cluster support in OptiX 9.0. It does not establish that one specific GPU model is required or best for Mega Geometry. Blackwell adds hardware cluster engines in its fourth-generation RT Cores, which NVIDIA says deliver up to twice the ray-triangle intersection rate of third-generation RT Cores. That hardware comparison applies to Blackwell; it is not a general Mega Geometry performance claim for every RTX GPU. NVIDIA’s RTX Blackwell architecture document
In March 2026, NVIDIA also announced that CONTROL Resonant would feature the technology and that it was working with CD PROJEKT RED on an in-development Mega Geometry foliage system for The Witcher 4. NVIDIA described the latter as aimed at path tracing dense natural environments with millions of detailed, uniquely animated plants and trees. These were announcements about planned or in-development work, not confirmation of a current release or shipping status. NVIDIA’s GDC announcement
Quick Recap
What to check before expecting a benefit
- Game support: Check whether the specific game implements Mega Geometry. A compatible RTX GPU alone does not add the technology to an unsupported title.
- Like-for-like performance: Compare FPS at the same resolution and settings, and note whether ray tracing, path tracing and other features are also enabled.
- Memory use and image quality: Consider VRAM alongside frame rate, and check whether the implementation changes visible detail or image quality.
- Hardware claims in context: Support beginning with Turing does not mean every RTX card will perform identically. The cited sources do not provide controlled, model-by-model benchmarks.
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