Ray tracing memory usage could be reduced by up to 90% thanks to 'most significant' DirectX update

DirectX has unveiled an update that could slash ray tracing memory usage by up to 90%, according to Microsoft. This update, which marks the most significant change to DirectX Ray Tracing (DXR) since its inception in 2018, introduces two features: Clustered Geometry and Partitioned TLAS.

Clustered Geometry breaks down complex models into chunks of 256 triangles or fewer, while Partitioned TLAS splits the overall game environment into smaller regions. This allows the ray tracing system to only focus on the areas that have changed, avoiding the need to reassess the entire scene each frame.

Microsoft's tests suggest this update could reduce memory load by as much as 90% without requiring a high-end GPU. In their tests, memory usage decreased from 7.5 GB to 774 MB, and frame rates doubled from 1.2 fps to 79 fps. However, not all games may achieve the same results, and the update could require more temporary memory during gameplay.

The update is currently in preview, and Microsoft has not announced a release date for widespread availability. For those interested in experimenting with the features, Microsoft provides instructions on how to access experimental features through the Agility SDK preview headers, runtime, and a supporting driver with Windows Developer Mode enabled. Despite the potential benefits, gamers should be cautious and consider the implications on gameplay and game development before adopting this new update.