Explore the groundbreaking techniques for rendering games with millions of ray-traced lights in this 21-minute video segment from NVIDIA. Dive into the fundamentals of ray tracing and its impact on game lighting, understanding the limitations and performance considerations. Discover the concept of importance sampling and its resampled variant, gaining insights into their mathematical foundations and practical applications. Learn about the basic ReSTIR algorithm and its implementation in game rendering. Gain valuable knowledge about NVIDIA's RTXDI (Direct Illumination) SDK and its potential for revolutionizing game graphics. For a comprehensive understanding, viewers are encouraged to watch the full talk, which includes practical light resampling techniques and the RTXDI roadmap.