> other global illumination improvements RTX cards don't render everything with ray tracing. They use it for light calculations, for example it can be used exa

> other global illumination improvements RTX cards don't render everything with ray tracing. They use it for light calculations, for example it can be used exactly for global illumination. > why this is something we need. The answer is simple. Because there is a limit to how realistic we can make the lighting and shadowing using the old models. We are almost at that limit. Using ray tracing removes that limit. > challenging to do in a game with consistent frame rates Try Quake II RTX. It is very consistent right off the bat, and if you turn on the resolution scaling, you can get completely consistent framerates (within 2-3 fps continuously). While it might not be a game with the most advanced graphics, it does have variety of scenes, and there is no issue with the framerates being "inconsistent".