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[[File:Physically Based Rendering Sample 2.png|thumb|upright=1.2|A [[diamond plate]] texture rendered close-up using physically based rendering principles. [[Specular highlight#Microfacets|Microfacet]] abrasions cover the material, giving it a rough, realistic look even though the material is a [[metal]]. [[Specular highlight]]s are high and realistically modeled at the appropriate edge of the tread using a [[normal mapping|normal map]].]]
'''Physically based rendering''' ('''PBR''') is a [[computer graphics]] approach that seeks to [[3D rendering|render]] images in a way that models the lights and surfaces with [[optics]] in the real world. It is often referred to as "Physically Based Lighting" or "Physically Based Shading". Many PBR pipelines aim to achieve [[photorealism]]. Feasible and quick [[approximation]]s of the [[bidirectional reflectance distribution function]] and [[rendering equation]] are of mathematical importance in this field. [[Photogrammetry]] may be used to help discover and encode accurate optical properties of materials. PBR principles may be implemented in real-time applications using [[Shader]]s or offline applications using [[Ray tracing (graphics)|ray tracing]] or [[Path tracing|path tracing]].
==History==
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