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Microfacet abrasions cover the material, giving it a rough, realistic look even though the material is a metal . Specular highlights are high and realistically modeled at the appropriate edge of the tread using a normal map . Physically based rendering ( PBR ) is a computer graphics approach that seeks to 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 approximations 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 shaders or offline applications using ray tracing or path tracing . History [ edit ] Starting in the 1980s, a number of rendering researchers worked on establishing a solid theoretical basis for rendering, including physical correctness. An early system, Radiance , for lighting design and architecture, was presented in Greg Ward's 1994 SIGGRAPH paper, "The RADIANCE Lighting Simulation and Rendering System, [ 1 ] " which may have introduced the phrase "physically-based rendering". Other work was done at the Cornell University Program of Computer Graphics; a 1997 paper from that lab [ 2 ] describes the work done at Cornell in this area to that point. "Physically Based Shading" was introduced by Yoshiharu Gotanda during the course Physically-Based Shading Models in Film and Game Production at the SIGGRAPH 2010. And followed by the course Physically Based Shading in Theory and Practice organised by Stephen Hill and Stephen McAuley between 2012 and 2020. The phrase "Physically Based Rendering" was more widely popularized by Matt Pharr , Greg Humphreys, and Pat Hanrahan in their book of the same name from 2004, a seminal work in modern computer graphics that won its authors a Technical Achievement Academy Award for special effects . [ 3 ] The book is now in its fourth edition. [ 4 ] The first successful, yet partial implementation of physically-based rendering in a video game can be found in the 2013 title Remember Me , that despite being built on a game engine not natively supporting this technology ( Unreal Engine 3 ) was properly modified to accommodate this feature. [ 5 ] Despite being a moderate approach to PBR, its accuracy has been further refined with posterior titles such as Ryse: Son of Rome and Killzone Shadow Fall , released on the same year, until the current state of PBR advancements in the 2020s. [ 6 ] [ 7 ] Process [ edit ] Bricks rendered using PBR. Even though this is a rough, opaque surface, more than just diffuse light is reflected from the brighter side of the material, creating small highlights, because "everything is shiny" in the physically-based rendering model of the real world. Tessellation is used to generate an object mesh from a heightmap and normal map , creating greater detail. PBR is, as Joe Wilson puts it, "more of a concept than a strict set of rules" [ 5 ] – but the concept contains several distinctive points of note. One of these is that – unlike many previous models that sought to differentiate surfaces between non-reflective and reflective – PBR recognizes that, in the real world, as John Hable puts it, "everything is shiny". [ 8 ] Even "flat" or "matte" surfaces in the real world such as concrete will reflect a small degree of light, and many metals and liquids will reflect a great deal of it. Another thing that PBR models attempt to do is to integrate photogrammetry - measurements from photographs of real-world materials - to study and replicate real physical ranges of values to accurately simulate albedo , gloss , reflectivity , and other physical properties. Finally, PBR puts a great deal of emphasis on microfacets , and will often contain additional textures and mathematical models intended to model small-scale specular highlights and cavities resulting from smoothness or roughness in addition to traditional specular or reflectivity maps. Surfaces [ edit ] PBR often utilize Bidirectional scattering distribution functions to calculate the visible light reflected at a given point on surfaces . Common techniques use approximations and simplified models that try to fit approximate models to more accurate data from other more time consuming methods or laboratory measurements (such as those of a gonioreflectometer ). As described by researcher Jeff Russell of Marmoset, a surface-focused physically based rendering pipeline may also focus on the following areas of research: [ 7 ] Reflection Diffusion Translucency and transparency Conservation of energy Metallicity Fresnel reflection Subsurface scattering Volumes [ edit ] PBR is also often extended into volume renderings , with areas of research like: Lens -related/ Angle of view / Depth of field effects Caustics Light scattering Participating media Atmospheric visual properties such as: Day - night cycle Elevation Angular distance from the Sun or Moon or other orbital objects Weather and sky conditions, including clouds , precipitation , and aerosol obscurations such as fog or haze . Application [ edit ] Thanks to high performance and low costs of modern hardware [ 9 ] it has become feasible to use PBR not only for industrial but also entertainment purposes wherever photorealistic images are desired, such as video games or movie making. [ 3 ] Today's mid to high-end hardware is capable of producing and rendering PBR content and there exists a market of easy-to-use software that allows designers of all experience levels to take advantage of physically based rendering methods, such as: Brikl 3ds Max O3DE OGRE Maya LightWave Babylon.js Bevy [ 10 ] Blender Cinema 4D CryEngine Enscape Vue Godot (game engine) Houdini (SideFX) iClone jME Microstation Minecraft GLSL Shaders Rhinoceros 3D Roblox Studio Second Life Sketchfab Stride Three.js Unigine Source 2 Unity Unreal Engine VTK Webots A typical application provides an intuitive graphical user interface that allows artists to define and layer materials with arbitrary properties and to assign them to a given 2D or 3D object to recreate the appearance of any synthetic or organic material. Environments can be defined with procedural shaders or textures as well as procedural geometry or meshes or point clouds . [ 6 ] If possible all changes are made visible in real-time and therefore allow for quick iterations. Sophisticated applications allow savvy users to write custom shaders in a shading language such as HLSL or GLSL , though increasingly node-based material editors that allow a graph-based workflow with native support for important concepts such as light position, levels of reflection and emission and metallicity, and a wide range of other math and optics functions are replacing hand-written shaders for all but the most complex applications. See also [ edit ] Non-photorealistic rendering References [ edit ] ↑ Ward, Gregory J. (1994-07-24). "The RADIANCE lighting simulation and rendering system" . Proceedings of the 21st annual conference on Computer graphics and interactive techniques - SIGGRAPH '94 . New York, NY, USA: Association for Computing Machinery. pp. 459– 472. doi : 10.1145/192161.192286 . ISBN 978-0-89791-667-7 . ↑ Greenberg, Donald P. (1 August 1999). "A framework for realistic image synthesis" (PDF) . Communications of the ACM . 42 (8): 44– 53. doi : 10.1145/310930.310970 . Archived (PDF) from the original on 24 September 2018 . Retrieved 27 November 2017 . 1 2 Pharr, Matt; Humphreys, Greg; Hanrahan, Pat (2004). Physically Based Rendering: From Theory to Implementation (1st ed.). Morgan Kaufmann. ISBN 9780080538969 . ↑ Pharr, Matt; Jakob, Wenzel; Humphreys, Greg (2023). Physically Based Rendering: From Theory to Implementation (4th ed.). Cambridge, MA: The MIT Press. ISBN 9780262048026 . 1 2 Wilson, Joe. "Physically Based Rendering – And You Can Too!" . Marmoset . Retrieved 12 January 2017 . 1 2 "Point Clouds" . Sketchfab Help Center . Retrieved 29 May 2018 . 1 2 Russell, Jeff. "Basic Theory of Physically-Based Rendering" . Marmoset . Retrieved 20 August 2019 . ↑ Hable, John (7 November 2010). "Everything Is Shiny" . Filmic Games . Archived from the original on 5 December 2016 . Retrieved 14 November 2016 . ↑ Kam, Ken (23 April 2018). "How Moore's Law Now Favors Nvidia Over Intel" . Forbes . Retrieved 29 May 2018 . ↑ "Bevy Engine" . bevy.org . v t e Computer graphics Vector graphics Diffusion curve Pixel 2D graphics Alpha compositing Layers Text-to-image 2.5D Isometric graphics Mode 7 Parallax scrolling Ray casting Skybox 3D graphics 3D projection 3D rendering ( Image-based Spectral Unbiased ) Aliasing Anisotropic filtering Cel shading Fluid animation Lighting Global illumination Hidden-surface determination Polygon mesh ( Triangle mesh ) Shading Deferred Surface triangulation Wire-frame model Concepts Affine transformation Back-face culling Clipping Collision detection Planar projection Reflection Rendering Beam tracing Cone tracing Checkerboard rendering Ray tracing Path tracing Ray casting Scanline rendering Rotation Scaling Shadow mapping Shadow volume Shear matrix Shader Texel Translation Volume rendering Voxel Graphics software 3D computer graphics software animation modeling rendering Raster graphics editors Vector graphics editors Algorithms List of computer graphics algorithms Retrieved from " https://en.wikipedia.org/w/index.php?title=Physically_based_rendering&oldid=1355301980 " Category : Computer graphics Hidden categories: Articles with short description Short description is different from Wikidata This page was last edited on 21 May 2026, at 02:15  (UTC) . Page was rendered with Parsoid . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy . Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. , a non-profit organization. Privacy policy About Wikipedia Disclaimers Contact Wikipedia Legal & safety contacts Code of Conduct Developers Statistics Cookie statement Mobile view Search Search Toggle the table of contents Physically based rendering 10 languages Add topic