As for Portal with RTX, it also features high resolution physically based textures which are hand-crafted and high-poly models. Nvidia DLSS 3 is used to enhance performance, while latency is reduced using Nvidia Reflex. The ray tracing applies to every light source, from global illumination indirect lighting to volumetric ray-traced lighting that scatters in fog and smoke with perfect shadows.

It also features some new Nvidia tech, like RTX Direct Illumination (RTXDI) for “countless direct light sources, big and small, each casting light and shadows.” There’s also Reservoir Spatio Temporal Importance Resampling Global Illumination (ReSTIR GI) which “enhances indirect light, enabling it to bathe a scene and illuminate dark corners that are not lit directly.” This is supposed to work “smarter” than past ray-traced global illumination tech.

Check out the comparison trailer below to see it all in action.