RTXDI – RTX Direct Illumination

Written by Mohamed Fawzy

Mohamed is the founder of SALAMA PRODUCTIONS ©, an indie game developer and writer. He has a passion for creating episodic cinematic games that combine stunning graphics and captivating stories. His vision is to showcase the beauty and mystery of nature and reality. He believes that games are a powerful medium for expressing ideas, emotions, and messages that can inspire and entertain people around the world.

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March 1, 2023

NVIDIA Launches RTX Direct Illumination (RTXDI), a Revolutionary Technology for Real-Time Lighting

NVIDIA has announced the launch of RTX Direct Illumination (RTXDI), a new technology that enables and accelerates the rendering of dynamic direct lighting and shadows from millions of light sources in real time. RTXDI is part of the NVIDIA RTX platform, which leverages the power of ray tracing to create stunning and immersive graphics.

RTXDI is a game-changer for artists and developers who want to create realistic and complex lighting scenarios in their games and applications. With RTXDI, any geometry of any shape can emit light, cast appropriate shadows, and move freely and dynamically. This allows for unprecedented levels of detail and realism in scenes such as night amusement parks, Times Square billboards, neon signs, exploding fireballs, and more.

RTXDI works as an oracle for shadow rays, telling the renderer where to send rays to efficiently sample the lighting environment. This reduces the manual tuning required to light scenes and improves the productivity of any art pipeline. RTXDI also supports any number of light sources, from a few to millions, without compromising performance or quality.

RTXDI can be combined with other NVIDIA ray tracing SDKs, such as RTX Global Illumination (RTXGI) for fast and scalable indirect lighting, to achieve even more stunning results. RTXDI is compatible with any DirectX 12 ray tracing API and can be integrated into any game engine that supports ray tracing.

NVIDIA has released a demo video of RTXDI in action, showcasing a scene with over 100,000 dynamic lights rendered in real time on a single GeForce RTX 3090 GPU. The video also compares RTX DI with prior state-of-the-art sampling techniques, demonstrating how RTX DI can generate a beautiful finished image with the same level of overhead.

RTX DI is available now as an early access SDK for registered developers on the NVIDIA Developer website¹. NVIDIA plans to bring this technology to game developers in 2021². For more information and resources on RTX DI, visit the NVIDIA Developer blog³.