====== Clear Sky ======

Clear Sky enables you to procedurally create physically based skies within Lys.

With full real-time control over camera altitude, Azimuth angle, Zenith angle and luminance within Clear Sky you can generate realistic vistas with a very small amount of time and effort.

{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/clear_sky_radiance.png|}}

===== The Clear Sky Interface =====

----

==== Main Tab ====

[{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/general_lys.png?nolink|Clear Sky}}]

**W:** The desired width of the Clear Sky image which is to be generated.

**Chain Icon:** Here you can constrain the width & height of the Clear Sky image together. Unchecking will unlink the values & allow independent values to be used.

**H:** The desired height of the Clear Sky image which is to be generated.

**Generate:** This button will generate a Clear Sky image, as per the width and height settings.


==== Clear Sky Group ====

[{{https://s3.amazonaws.com/docs.knaldtech.com/docuwiki/clear_sky_lys.png?nolink|Clear Sky Settings}}]

**Camera Altitude:** - The altitude of the camera in the world in meters

**Azimuth Angle:** - The solar azimuth angle of the sun measured via a spherical coordinate system. North is 0/360°, East is 90°, South is 180° and west is 270°.

**Zenith Angle:** - The altitude of the sun based on the angle between the horizon and the centre of the Sun's disc.

**Sky Type:** - Here you can choose if the atmosphere is cloudy or partially cloudy.
  * **Default** - Default has a cloudy atmosphere
  * **Partially Cloudy** - Partially Cloudy has a partially cloudy atmosphere.


**Luminance:** - 

**Disable Sun:** - Disables rendering of the Sun’s disc. The does not affect the general ambient lighting of the scene.

**Disable Ground:** - Disables rendering of the ground.