> For the complete documentation index, see [llms.txt](https://lexset-1.gitbook.io/lexset-seahaven/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lexset-1.gitbook.io/lexset-seahaven/seahaven/readme/getting-started/simulation-editor/scene/physical-sun-sky.md).

# Physical Sun/Sky

Adds a procedural sun and sky to the environment.

<figure><img src="https://1909422608-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4GudP3s7lhKkLuTADYnf%2Fuploads%2FQMQfVTbhtqEcjviGkDJ2%2Fimage.png?alt=media&amp;token=401302e5-efc6-4b3f-acad-d0cbd1441538" alt=""><figcaption></figcaption></figure>

**Sun Strength:** *Relative strength of the sun's illumination. It is recommended to use a low value (e.g. 0.1) to avoid over-exposure.*

**Sun Rotation:** *Rotation of the sun in the sky relative to the world origin where 0 degrees locates the sun at the positive Y world axis.*

**Sun Elevation:** *Elevation of the sun (in degrees) relative to the horizon.*\
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**Sun/Sky Model:** *Nishita (*[*Nishita et al. 1993.*](http://nishitalab.org/user/nis/cdrom/sig93_nis.pdf)*), Hosek-Wilkie (*[*Hosek-Wilkie et al. 2012.*](https://cgg.mff.cuni.cz/projects/SkylightModelling/HosekWilkie_SkylightModel_SIGGRAPH2012_Preprint.pdf)*), or Hosek-Wilkie (No-Shadow). If the "no-shadow" option is selected, shadow rays from the sun lamp will be disabled.*