Schlick's approximation

Do you know when you look at a smooth surface, sometimes you see a reflection of yourself or things around you? This happens because when light hits the surface, it bounces back to your eyes, making it look like there is a mirror there.

But did you know that not all surfaces reflect light the same way? Some surfaces reflect a lot of light, while others reflect very little. And some surfaces reflect more light when you look at them from certain angles than from others.

That's where Schlick's approximation comes in. It's a way of predicting how much light will reflect off a surface based on the angle you're looking at it from. Schlick's approximation is like a fancy math equation that tells you how much light a surface will reflect based on that surface's properties.

Basically, it estimates how much light will reflect off a surface by using some fancy math that takes into account the angle of the light hitting the surface and the angle at which you're looking at the surface. This can be really helpful for things like video games and movies, where they need to make things look realistic.

In short, Schlick's approximation helps us figure out how much light will reflect off a surface and how it will look to our eyes, depending on how we're looking at the surface.