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This is a paid asset, but now you can download Rainbows for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Rainbows v1.1
Two beautiful rainbow effects to add some whimsical beauty to your game!
With one full and one half rainbow, simply drag the chosen particle effect into your scene.
The 360 degree skydome is also included.
New to version 1.1, a fixed mesh version of the rainbows.