Witcher 3 Next-Gen will feature RTGI and RTAO. Witcher 3 Next-Gen will feature RTGI and the RTAO. The RTGI, also known as Ray Traced Global Illumination lighting technique, makes use of Ray Tracing to produce natural, general lighting by reflecting rays across surfaces in space. RTAO (Ray Traced Ambient Obscursion, controls how the diffused light within the space is reflected by objects allowing it to appear more realistic and have more natural in depth, especially when it comes to folded, curly or edged objects made using Ray Tracing. The brand new Ultra+ setting level added to the game appears to make use of all the power of most robust systems. It is also worth noting that the game will be compatible with DLSS 2 and FSR 2.