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A 'Skybox' is a flat 2D image applied around your Space. The result simulates the experience of being in a much larger environment.
Note: The Skybox will affect the lighting in your scene, so it is best to add this early on.
You can download royalty-free Skyboxes (HDRI Images) from .
Download the EXR from the HDRI section (or elsewhere).
Save it into your assets folder in your Unity build.
Click on that file in Unity, change the 'Texture Shape > Cube' (in the inspector), and hit apply.
Create a new material.
Set the Shader (at the top of the inspector) to 'Skybox/Cubemap.'
Drag your EXR file onto the Cubemap (HDR) slot in the material.
Drag your material onto the scene's background; it should update with your Skybox!
For more information on adding skyboxes in Unity go to :
This section will go over changing the default Unity Skybox to an HDRI image.