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A '''lightfield''' is an area or volume of light treated as a set of [[ray]]s, where each ray has a magnitude and angle. A light field is the set of light rays flowing through a point, surface or volume from every direction. It approximately represents how light travels in physical space from a [[ray optics]] perspective. It is also known as a radiance field.

A '''light field''' is a volume of light that has rays going in various directions. A light field represents light in a way that can be viewed naturally through 3D displays. It is a volume of [[light]] that is segmented into rays that have direction, magnitude, and optionally color. It is a method of representing light that includes the angle of each ray of light. It can be a volume of light treated as a set of [[ray]]s, or a flat surface through which different angled light travels.

A light field can be displayed using a [[light field display]], which is a type of [[multifocal display]].

A light field is the set of light rays flowing through a surface or volume from every direction. It represents how light travels in physical space from a [[ray optics]] perspective. A light field can be viewed using a [[light field photograph]]. A light field can be displayed using a [[light field display]], which is a type of [[multifocal display]]. It is possible to record a light field using a [[light field camera]], such as a camera from [[Lytro]].

It is possible to record a light field using a [[light field camera]], such as a camera from [[Lytro]].

A light field can be represented using a [[plenoptic function]], which is a 5 dimensional function. A partial light field can be represented in 4 dimensions using the [[two-plane method]].<ref name="k782">{{cite conference | last=Gortler | first=Steven J. | last2=Grzeszczuk | first2=Radek | last3=Szeliski | first3=Richard | last4=Cohen | first4=Michael F. | title=The lumigraph | publisher=ACM | date=1996 | isbn=978-0-89791-746-9 | doi=10.1145/237170.237200 | page=43–54}}</ref> That can result in a 4-dimensional function. However, it may be limited in focal depth. Light fields are useful for 3D because the largest or second largest factor that determines focus is the angle of rays coming into a human eye.

There are multiple ways to represent a light field using data. A method is the two-plane method, which results in a 4D representation.

"Lightfield", "plenoptic", and "[[integral imaging]]" are all the same thing.

A light field can be black and white or full color.

A light field can be represented using a [[plenoptic function]], which is a 5 dimensional function. A light field can be represented in 4 dimensions using the two-plane method.<ref name="k782">{{cite conference | last=Gortler | first=Steven J. | last2=Grzeszczuk | first2=Radek | last3=Szeliski | first3=Richard | last4=Cohen | first4=Michael F. | title=The lumigraph | publisher=ACM | date=1996 | isbn=978-0-89791-746-9 | doi=10.1145/237170.237200 | page=43–54}}</ref>

Light fields can be represented using euclidean spatial representation, instead of having to use a relativistic understanding.

 

Light fields are useful for 3D because the largest or second largest factor that determines focus is the angle of rays coming into the eye.

 

 

There are multiple ways to represent a light field using data. A method is the two-plane method.

 

A light field can be full color or it can be black and white.  

==History==

==History==

Leonardo da Vinci explored the idea of a scene consisting of light rays of various angles in the 1500s.<ref>http://lightfield-forum.com/2012/08/lightfield-history-who-invented-the-concept-of-the-light-field/</ref>

Leonardo da Vinci explored the idea of a scene consisting of light rays of various angles.<ref>http://lightfield-forum.com/2012/08/lightfield-history-who-invented-the-concept-of-the-light-field/</ref>

The term "light field" was used by A. Gershun in a 1936 paper, published in an english translation in the year 1939.

The term "light field" was used by A. Gershun in a research paper.

Work in computational light fields was done by [[Marc Levoy]] and [[Pat Hanrahan]] in about 1995 and 1996.<ref name="d565">{{cite web | title=Light Field Rendering | website=

Work in light fields generated by a computer was done by [[Pat Hanrahan]] and [[Marc Levoy]].<ref name="d565">{{cite web | title=Light Field Rendering | website=

Computer Graphics at Stanford University

Computer Graphics at Stanford University

  | url=http://www-graphics.stanford.edu/papers/light/ | ref={{sfnref |  

  | url=http://www-graphics.stanford.edu/papers/light/ | ref={{sfnref |  

}} | access-date=2024-07-13}}</ref>

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Light field rendering research in the 1990s was focused on novel viewpoints for existing data, but entirely for 2D screens.<ref>https://pages.cs.wisc.edu/~dyer/cs534/papers/levoy-light-field-tutorial.pdf</ref>

Light field rendering research has focused on novel viewpoints for existing data, but largely for 2D screens.<ref>https://pages.cs.wisc.edu/~dyer/cs534/papers/levoy-light-field-tutorial.pdf</ref>

==See also==

==See also==

[[Category:Display]]

[[Category:Display]]

[[Category:Light field]]

[[Category:Light field]]