Radiance Theory

Radiance theory describes how light emits from a surface or source in all directions, capturing both its brightness and angular distribution. It provides a detailed way to quantify how much light is shining from a specific area and how it's spread across different angles, useful in fields like computer graphics, lighting design, and optical engineering. Essentially, radiance helps us understand and simulate how light interacts with objects and spaces, enabling realistic rendering of scenes by accounting for the intensity and directionality of light sources.