NVIDIA has updated its RTX Global Illumination (RTXGI) SDK toolkit to version 2.0, ushering in what has been reported to be three major, brand-new technologies, including those that can deliver more realistic lighting in supported games. The new SDK is available through the NVIDIAGameWorks/RTXGI GitHub, which saw its initial commit on March 13.
RTXGI 2.0 features:
- NRC – Neural Radiance Cache
- SHaRC – Spatial Hash Radiance Cache
- DDGI – Dynamic Diffuse Global Illumination
NVIDIA on NRC:
Neural Radiance Cache (NRC) is an AI-powered algorithm that trains the radiance cache about a scene in real time, handling fully dynamic scenes with no assumptions about lighting, geometry, and materials. It uses AI acceleration to train the radiance cache in real time to offer improved performance and more accurate global illumination in highly demanding scenes.
NVIDIA on SHaRC:
Spatial Hash Radiance Cache (SHaRC) is a radiance cache that’s built on a spatial hash data structure designed for a fast and scalable global illumination technique for path tracing. It’s similar to NRC, but it doesn’t use a neural network. SHaRC will run on any DirectX or Vulkan ray-tracing-capable GPU.
NVIDIA on DDGI:
Content creation at the speed of light. Accelerated global illumination in path tracing. Infinite bounce lighting in real time. Dynamic Diffuse Global Illumination (DDGI) provides a scalable probe-based solution to deliver multi-bounce indirect lighting without requiring any offline lightmaps or light baking.