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The Attic demo: turn technologies like RTXGI, NRD and DLSS on and off in real time It’s also one of relatively few Nvidia graphics technologies that doesn’t actually require a Nvidia GPU: supported cards includes AMD’s new Radeon RX 6000 Series GPUs.

You can read a more detailed dive into the technology on Nvidia’s developer blog.Īs well as DirectX Raytracing (DXR), the RTXDI SDK supports the new ray tracing extensions for the Vulkan API, making it one of the first new technologies capable of making use of Vulkan ray tracing. The system is based on a new deep learning algorithm, ReSTIR (Reservoir-based Spatio-Temporal Importance Resampling). Rather than an artist having to select a small number of hero lights for a scene, it removes “all costs associated with culling and identifying important lights, shadow mapping, and ambient occlusion”. In its simplest implementation, Nvidia descibes RTXDI as a straight replacement for a game engine or real-time renderer’s existing direct lighting system. However, they are pretty varied, with geometry including neon billboards, brake lights, apartment windows and even wet roads acting as independent, dynamic, shadow-casting and reflection-generating light sources. The RTX Boulevard demo, recorded running on a top-of-the-range GeForce RTX 3090 gaming GPU, isn’t actually quite that ambitious: it features only “thousands” of lights.

The RTX Boulevard demo: thousands of dynamic, shadow-casting area lights rendered using RTXDIĪnnounced at GTC last year, RTXDI is described as enabling artists to “render scenes with millions of dynamic area lights in real time” without the need to bake lighting.

The Attic demo is a downloadable executable built on Unreal Engine 4.26 showcasing several Nvidia technologies, including RTXGI (RTX Global Illumination), NRD (Nvidia Realtime Denoisers) and DLSS. The RTX Boulevard demo (above) is a pre-rendered video showing RTXDI (RTX Direct Illumination), which Nvidia describes as making it possible to use millions of area lights in a real-time scene. Nvidia has released demos showcasing its new GPU ray tracing SDKs, including real-time direct illumination system RTXDI and indirect illumination system RTXGI, at its GTC 2021 technology conference.