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Getting started

Physical Starlight and Atmosphere (PSA) is a Blender addon for advanced environmental lighting that provides high quality atmospherics and lighting, and visual consistency between every object in your scene. It can be installed as any other Blender addon.


Latest Physical Starlight and Atmosphere is supported by Blender 3.4+. Addon versions from v1.2 till 1.6.1 works on Blender 2.81 - 3.3.



"Physical Starlight and Atmopshere" is only available for purchase on Blendermarket or Gumroad. Get your latest version there.

  • Download the "physical-starlight-atmosphere-[version here].zip" file.
  • Open Blender.
  • Go to Edit/Preferences.
  • Choose "Add-ons" tab and press "Install..." button.
  • Locate the .zip file and press "Install Add-on".
  • You will see the newly installed add-on, enable it by checking the checkbox.
  • Wait till it registers. Voila!

First Run

  • Locate Physical Starlight and Atmosphere panel in Sidebar also called N Panel (You can also find addon panel in the World Properties). Click on the tab Atmosphere to reveal it.
  • Enable addon by ticking the uppermost checkbox.


To see the sky, you have to be in "Rendered" Viewport Shading mode (click on the 4th sphere in the list up in the right corner of 3D viewport)

First Run

What happens when addon is being enabled/disabled?

  • A couple of shader nodes are imported and dynamically added and connected to the currently active world. When you uncheck the Physical Atmosphere checkbox, these nodes will be removed.
  • Sun lamp Sarlight Sun is added. The Sun lamp is used as the main light source to cast shadows from the Sun. When you uncheck the Physical Atmosphere checkbox, if no active PSA instances are found in other worlds it will be removed.


There is no The One way to use this addon. That is why we encourage you to find the way it works best for you. Addon preferences panel is located under Edit > Preferences > Add-ons.

Toolbar Enabled

Default: true

By default, the Atmosphere tab is in the sidebar of Blender 3D viewport (N key) and "World Properties" tab in Properties panel. Setting this to false will hide the toolbar. Reveal panel by clicking on Atmosphere tab.

Toolbar Label

Default: "Atmosphere"

By default, Toolbar tab for Physical Starlight and Atmosphere is Atmosphere. It might be useful to rename it to something shorter like PSA to reduce space the tab is taking.

Use ACES color space

Default: false

The Academy Color Encoding System1 (ACES) is a color image encoding system created by hundreds of industry professionals. ACES allows for a fully encompassing color accurate workflow, with seamless interchange of high quality motion picture images regardless of source.

Use real world physical values

Default: false

By default, addon reduces atmosphere, sun and stars intensity values to get the feeling it just works, and you don't have to modify extra parameter Exposure in order to get realistic atmosphere. But very important part of this addon is having real world physical values to support visual consistency.


Presets allow you to store a snapshot of your customized atmosphere settings and return to it later or use already predefined presets provided by the addon.


To be able to use PSA predefined presets you have to use Blender version 3.0 and above.

Automatically added PSA presets are only available with PSA version 1.7+.

Installing and using presets

  1. Install the PSA addon (version 1.7+)
  2. Enable the addon inside the Blender Preferences
  3. Enable the addon inside the Blender Viewport, which will make the presets visible inside Blender
  4. In one of the Blender existing Areas open Data > Asset Browser
  5. Choose ''PSA'' in the dropdown menu
  6. Choose the preset you like and drag it into your scene
Troubleshooting: Concerning previous versions of Presets

If you have used the previous versions of Presets, you will need to delete the old asset file:

  • Open file explorer
  • Go to: > This PC > Local Disk > Users > /user/ > AppData > Roaming > Blender Foundation > Blender > /your version/ > datafiles > presets > PSA >

    • Alternatively (for non-Windows users):

      • Navigate to Blender preferences and locate ''Asset Libraries''
      • You have to find the User Library ''PSA'' or the library's name corresponding to the presets.blend file
      • After you have located the library, go to the denoted path and find ''presets.blend''
  • Delete the ''presets.blend'' file or any .blend file that starts with ''presets...''.

How to make your own presets

  1. In the PSA panel rename the world to your custom presets name

    New preset

  2. Right-click the world button and mark it as an asset

  3. Your asset will now appear in the asset browser (no preview will generate)