For even more info on the making of Ray Tracing: Overdrive Mode, check out our interview with CD PROJEKT RED
Previous techniques separately addressed ray-traced shadows, reflections and global illumination for a small number of light sources. Full ray tracing models the properties of light from a virtually unlimited number of emissive sources, delivering physically correct shadows, reflections and global illumination on all objects.
One of the most impactful additions in the technology preview of Cyberpunk 2077’s Ray Tracing: Overdrive Mode is NVIDIA RTX Direct Illumination (RTXDI), a free SDK that enables developers to closely replicate the appearance of light in scenes with numerous light sources. With RTXDI, thousands of objects can emit ray-traced light.
In Cyberpunk 2077, each neon sign, street lamp, LED billboard, car headlight, and other source of light is now ray-traced, bathing objects, walls, passing cars and pedestrians in accurate lighting.