This is a paid asset, but now you can download Portal Effect: URP Free.
Detail this asset from Unity Store: Original Link
Portal Effect: URP v1.0 (Latest version)
This asset allows you to create portals that players can see and walk through as if space itself has been warped. Players can see and step seamlessly across space through portals.
URP Only. Tested with Unity 2019.3.6f1 and URP 7.1.8
– Game-ready VFX (open, idle and close states)
– Seamless camera transition
– Rigidbodies save their velocities
– Optimization (frustum culling)
– Shaders are created with Amplify Shader Editor and URP Templates
– Distortion shader are created with Shader Graph