DirectX Developer Blog:
DirectX Raytracing (DXR) now supports Opacity Micromaps (OMMs), enabling hardware to handle alpha tested geometry more efficiently than relying only on costly AnyHit shader invocations.
At GDC 2025 DXR 1.2 was announced including OMMs, and you can see it discussed in this: GDC DirectX State Of The Union YouTube Recording. In the video, Remedy showed the performance wins they achieve using a synergistic combination of OMMs and Shader Execution Reordering in Alan Wake 2.
Out of the gate all NVIDIA raytracing capable hardware supports OMMs (currently developer preview drivers). Over time additional hardware vendor support for OMMs will appear.
The rest of this blog summarizes the feature, how to get bits, and highlights some sample code to help get started.
Read more:
D3D12 Opacity Micromaps - DirectX Developer Blog
DirectX Raytracing (DXR) now supports Opacity Micromaps (OMMs), enabling hardware to handle alpha tested geometry more efficiently than relying only on costly AnyHit shader invocations.
devblogs.microsoft.com
