What is SDF?

SDF stands for Signed Distance Function. It's a function that returns the shortest distance between a point in space and a set of surfaces. The sign of the distance indicates whether the point is inside or outside the shape. SDFs are commonly used in computer graphics, especially for rendering, collision detection, and shape representation because they provide a compact and mathematically convenient way to describe complex geometries. They are useful for real-time rendering techniques like ray marching.