PhysicallyBased

PhysicallyBased refers to a rendering technique used in computer graphics that aims to simulate the behavior of light in the real world. Instead of relying on artist-created approximations, PhysicallyBased Rendering (PBR) uses mathematical models to determine how light interacts with surfaces. This includes properties such as reflectivity, absorption, and scattering.

The core principle of PBR is to represent material properties in a way that is consistent with physical laws. This means that materials are described by parameters like albedo (base color), metallicness (how much the material behaves like metal), and roughness (how smooth or bumpy the surface is). When light strikes a surface, the PBR algorithm calculates how much light is reflected, how much is absorbed, and in what direction it is scattered, based on these material properties and the properties of the light source.

This approach leads to more realistic and consistent rendering results across different lighting conditions. Objects rendered with PBR tend to look more believable because their appearance doesn't drastically change when the lighting environment is altered. This makes it a popular choice for video games, architectural visualization, and visual effects in film, where a high degree of realism is desired. The underlying physics ensure that the rendered image accurately reflects how light would behave in a real-world scenario, leading to greater immersion and believability.