NVIDIA RTX Direct Illumination Ray Tracing
At the GPU Technology Conference earlier this week, NVIDIA showcased RTX Direct Illumination (RTXDI) technology, which basically adds millions of dynamic lights in real-time. The tech demo ran on an NVIDIA GeForce RTX 3090 GPU and showed realistic night scenes by allowing developers and artists to create cinematic visuals with realistic lighting, incredible reflections as well as accurate shadows through real-time ray tracing. Read more for two videos and additional information.



In the past, realistic lighting required complex baking solutions and could only be limited to a small number of “hero” lights, whereas RTXDI removes these limits by combining ray tracing as well as a deep learning algorithm called spatio-temporal importance resampling (ReSTIR). This means that both developers / artists can quickly integrate animated and color-changing lights into their scenes, without baking or using fixed hero lights.

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Based on NVIDIA research, RTXDI enables direct lighting from millions of moving light sources, without requiring any complex data structures to be built. From fireworks in the sky to billboards in New York Times Square, all of that complex lighting can now be captured in real time with RTXDI,” said NVIDIA.