PBR

Physically Based Rendering

A method in computer graphics that seeks to render images in a way that accurately simulates the interaction of light with surfaces in the real world. This approach, also known as Physically Based Shading (PBS), focuses on creating realistic textures and surfaces by mimicking the flow of light and its interaction with materials. PBR can significantly enhance the photorealism of 3D models and environments by accurately representing how light interacts with different material properties.

The core concept of PBR revolves around the idea that all surfaces, even those that appear matte or non-reflective, have some degree of shininess or reflectivity. PBR integrates measurements from real-world materials (photogrammetry) to study and replicate physical ranges of values like albedo, gloss, and reflectivity. This method also emphasizes the importance of microfacets, small-scale surface details that affect how light is reflected and scattered.

A key component in PBR is Bidirectional Scattering Distribution Functions (BSDFs), which describe how light scatters upon contact with a surface based on its physical properties. These functions are essential for modeling various surface interactions with light, including reflection, diffusion, translucency, and transparency.

PBR is widely used in industries like video game development, movie making, and 3D modeling software, as it allows for the creation of highly realistic and visually compelling materials and environments. The methodology of PBR not only improves the visual quality of 3D assets but also streamlines the workflow for artists, enabling them to focus more on creativity rather than the technical aspects of rendering.

• Abbreviation: PBR