# Radiance Parameter

![](https://2572426507-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Ma9X8PomX22wWVDNCoj%2Fuploads%2Fgit-blob-7767f9e79f914be57df89ea5d0b29ac36d81cfb0%2FRadiance_Parameter.png?alt=media)

![](https://2572426507-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Ma9X8PomX22wWVDNCoj%2Fuploads%2Fgit-blob-b5d5206f7f88e73cecd7480e16cc1050047c98b2%2FRadiance_Parameter.png?alt=media) - [\[source code\]](https://github.com/ladybug-tools/honeybee-grasshopper-radiance/blob/master/honeybee_grasshopper_radiance/src/HB%20Radiance%20Parameter.py)

Get recommended Radiance parameters given a recipe type and a level of detail.

The original recommendation for the various Radiance paramters comes from this document. <http://radsite.lbl.gov/radiance/refer/Notes/rpict_options.html>

This presentation by John Mardaljevic gives a good overview of the meaning of each radiance paramter. <http://radiance-online.org/community/workshops/2011-berkeley-ca/presentations/day1/JM_AmbientCalculation.pdf>

## Inputs

* **recipe\_type \[Required]**

  An integer or text for the type of recipe. Acceptable text inputs are either the full text of the recipe type (eg. point-in-time-grid) or the name of the Radiance command for which the parameters are being used (eg. rtrace). Choose from the following options.

  * 0 | rtrace | point-in-time-grid | daylight-factor
  * 1 | rpict | point-in-time-view
  * 2 | rfluxmtx | annual
* **detail\_level**

  An integer or text for the level of detail/quality for which radiance parameters will be output. (Default: 0 for low). Choose from the following options.

  * 0 | low
  * 1 | medium
  * 2 | high
* **additional\_par**

  Text to override the Radiance parameters as needed. Radiance's standard syntax must be followed (e.g. -ps 1 -lw 0.01).&#x20;

## Outputs

* **rad\_par**

  Radiance parameters as a text string. These can be plugged into the radiance*par* input of the various recipes.&#x20;