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{{Short description|Computer graphics rendering technique}}

In computer graphics, '''spectral rendering''' is a technique in which a scene's light transport is modeled with real wavelengths. This process is typically slower than traditional [[rendering (computer graphics)|rendering]], which renders the scene in its red, green, and blue components and then overlays the images. Spectral rendering is often used in [[Ray tracing (graphics)|ray tracing]] or [[photon mapping]] to more accurately simulate the scene, often for comparison with an actual photograph to test the rendering algorithm (as in a [[Cornell Box]]) or to simulate different portions of the [[electromagnetic spectrum]] for the purpose of scientific work. The images simulated are not necessarily more realistic ''appearing,'' but when compared to a real image pixel for pixel the result is often much closer.

Spectral rendering can also simulate light sources and objects more effectively, as the light's [[emission spectrum]] can be used to release photons at a particular wavelength in proportion to the spectrum. Objects' [[spectral reflectance curve]]s can similarly be used to reflect certain portions of the spectrum more accurately.

As an example, certain properties of tomatoes make them appear differently under sunlight than under fluorescent light. Using the [[blackbody radiation]] equations to simulate sunlight or the emission spectrum of a fluorescent bulb in combination with the tomato's spectral reflectance curve, more accurate images of each scenario can be produced.

==Implementations==
Render engines that define themselves as being capable of spectral rendering:

*[[Autodesk Vred (software)|Vred]]<ref>{{cite web |url=https://www.autodesk.com/products/vred/overview?term=1-YEAR&tab=subscription|title=Technical Specifications - |archive-url=https://web.archive.org/web/20220527021005/https://www.autodesk.com/products/vred/overview?term=1-YEAR&tab=subscription |archive-date=27 May 2022}}</ref>

*[[Arion (software)|Arion]]<ref>{{cite web |url=http://www.randomcontrol.com/arion-tech-specs |title=Technical Specifications - Provisional |website=www.randomcontrol.com |url-status=dead |archive-url=https://web.archive.org/web/20100121054112/http://www.randomcontrol.com/arion-tech-specs |archive-date=2010-01-21}}</ref>

*FluidRay<ref>{{Cite web|url=http://www.fluidray.com/features|title = Fast 3D Rendering, Spectral Rendering, Volumetrics & More Features}}</ref>

*Indigo Renderer<ref>{{Cite web|url=http://www.indigorenderer.com/features/technical|title=Technical Specifications | Indigo Renderer}}</ref>

*[[LuxCoreRender]]<ref>{{Cite web|url=http://www.luxrender.net/wiki/Features#Physically_based.2C_spectral_rendering|title = Lux Render - General News 2021}}</ref>

*[[mental ray]]<ref>{{cite web |url=http://www.mentalimages.com/products/mental-ray/about-mental-ray/features.html |title=mental images: Features |website=www.mentalimages.com |url-status=dead |archive-url=https://web.archive.org/web/20110128055950/http://www.mentalimages.com/products/mental-ray/about-mental-ray/features.html |archive-date=2011-01-28}}</ref>

*Mitsuba<ref>{{Cite web|url=http://www.mitsuba-renderer.org/index.html|title=Mitsuba 2 - A Retargetable Forward and Inverse Renderer}}</ref>

*[[Octane Render]]<ref>{{cite web |url=http://render.otoy.com/features.php |title=Octane Render |website=render.otoy.com |url-status=dead |archive-url=https://web.archive.org/web/20121130033220/http://render.otoy.com/features.php |archive-date=2012-11-30}}</ref>

*Spectral Studio<ref>{{Cite web |url=http://www.spectralpixel.com/index.php/features |title=Spectral Studio - Features |access-date=2012-03-19 |archive-date=2012-01-14 |archive-url=https://web.archive.org/web/20120114061943/http://www.spectralpixel.com/index.php/features |url-status=dead }}</ref>

*Thea Render<ref>{{Cite web|url=http://www.thearender.com/cms/index.php/features/tech-tour/37.html|title=Thea Products}}</ref>

*Ocean<ref>{{Cite web|url=http://www.eclat-digital.com/spectral-rendering/|title=Spectral rendering|date=22 February 2013}}</ref>

*ART<ref>{{Cite web|url=https://cgg.mff.cuni.cz/ART/about/|title = About ART « the ART Homepage @ CGG}}</ref>

* Manuka<ref>{{Cite web|url=https://www.wetafx.co.nz/research-and-tech/technology/manuka/|title = Manuka | Weta Digital}}</ref>

*Predict Engine <ref> {{Cite web|url=https://www.united-vr.com/products#predict-engine|title = Predict Engine | United Visual Researchers}}</ref>

*Malia <ref> {{Cite web|url=https://mrf-devteam.gitlab.io/mrf/main.md.html|title = Welcome to The Malia Rendering Framework!}}</ref>

==References==
{{reflist}}

==External links==
*[http://www.graphics.cornell.edu/online/box/compare.html Cornell Box Photo Comparison]

{{Computer graphics}}

[[Category:3D rendering]]

Spectral rendering - Revision history

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