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This is a paid asset, but now you can download Portal Particle Effect 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
Portal Particle Effect v2.2
Unique and high quality particle effects :
– 18 portal effect prefabs
– Easy to change the color
– Screenshots and video do not contain effects (Only Realtime)
– Easy for mobile devices
– Include demo scene
– Unity 5.6 and 2018
– UPDATE 2.0 – New version Effect