Microsoft is preparing a significant upgrade to DirectX Raytracing (DXR), the ray tracing pipeline used within DirectX 12 Ultimate, and the goal is straightforward: faster, more efficient ray-traced graphics in games—especially in scenes packed with complex geometry and lots of objects on screen.
On March 17, Microsoft published detailed specifications for three key DXR improvements: clustered geometry, partitioned top-level acceleration structures (TLAS), and indirect acceleration structure operations. Together, these updates are designed to boost ray tracing performance by shifting more work onto the GPU and streamlining how geometry and entire scenes are processed. Microsoft says these capabilities are still in active development, with a preview release planned for summer 2026.
One of the biggest additions is clustered geometry, which changes how the GPU works with triangles—the fundamental building blocks of 3D graphics. Instead of treating large sets of triangles as many individual pieces that require repeated handling, clustered geometry groups nearby triangles into larger, simplified chunks. That means the GPU can instantiate and move geometry in bulk rather than relying on numerous calls to manage countless triangle-level elements. In practical terms, this can reduce overhead and improve ray tracing performance in situations like dense foliage, large crowds, or heavily detailed environments where similar objects might otherwise need repeated geometry updates or duplication.
Microsoft is also introducing partitioned TLAS, which applies a similar “grouping” idea to the broader structure of the game scene. TLAS helps ray tracing determine where objects are in a world and how rays should interact with them. With partitioning, the full scene can be divided into smaller, more manageable sets that the GPU can work through more efficiently. This is important for performance because it enables ray tracing to focus only on the visible or necessary parts of a scene instead of processing everything at once, potentially speeding up rendering in large or complex environments.
The third feature, indirect acceleration structure operations, targets a common bottleneck: work that traditionally falls on the CPU. With this update, certain tasks related to acceleration structures can be handled directly by the GPU. Microsoft specifically points to operations such as building, compacting, moving, and instantiating templates via GPU-managed API calls. For gamers, that shift could mean lower system latency and smoother ray tracing performance when a game world becomes more demanding—like during fast camera movement, heavy action, or scenes with many objects that need frequent updates.
Compatibility is another major part of Microsoft’s message. The company notes that these DXR enhancements should work on any ray tracing-capable GPU through a driver update. At the same time, Microsoft suggests that newer GPUs may unlock additional benefits beyond what’s outlined in the current specifications, though it doesn’t name specific models or architectures. It also cautions that some older GPUs might not receive support for every feature, depending on the tradeoffs hardware vendors choose to make.
With a summer 2026 preview on the roadmap, these next-generation DXR features signal Microsoft’s push to make ray tracing more scalable—helping developers deliver richer lighting and reflections without the steep performance costs that can come with complex geometry and massive scenes.
