Microsoft Overhauls DirectX Raytracing, Boosting Frame-Rates and Cutting VRAM
Microsoft has released a significant preview update to its DirectX Raytracing (DXR) standard, introducing improvements aimed at enhancing frame-rates and substantially reducing VRAM requirements for ray-traced graphics. According to engineer Amar Patel’s announcement blog, this marks the most consequential update to the specification since its introduction in 2018.
The update introduces two key technologies to achieve these gains. Clustered geometry improves how ray tracing acceleration structures are organized, while partitioned top-level acceleration structures (PTLAS) optimize the construction and updating of these critical data structures. Together, these innovations enable developers to build and update ray tracing acceleration structures more efficiently, directly translating to real-time performance improvements in games and applications.
Ray tracing acceleration structures are fundamental to modern real-time ray tracing, as they organize geometric data to enable fast ray-object intersection calculations. By improving how these structures are managed, Microsoft’s update addresses two critical pain points for developers: computational overhead and memory consumption. The changes should allow more sophisticated ray-traced effects to run at higher frame-rates, particularly beneficial for demanding titles targeting high refresh-rate displays.