What is PBR?

Physically Based Rendering (PBR) is a rendering approach in computer graphics that aims to simulate light interaction with materials in a more physically plausible way. Instead of relying on ad-hoc shading models, PBR uses mathematical models that approximate real-world physics, such as energy conservation, BRDFs (Bidirectional Reflectance Distribution Functions), and realistic light transport. This results in more consistent and realistic-looking materials under various lighting conditions. PBR is commonly used in video games, film, and other applications where visual realism is important.