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This is a paid asset, but now you can download Portals package Free.
Detail this asset from Unity Store: Original Link
Portals package v1.0.2 (Latest version)
Portals work on all 5.x unity versions with any rendering mode.
You can see a Web demo here.
Features: – 14 portal effect prefabs
– 3 platforms
– 4 gates
– 7 differen static and animated circles.
– Easy to recolor.
– Include demo scene.
See also Portals Package 2, Low Poly Portal, Stone Portal(included in pack) and Fantasy Portal(included in pack).