This is an UE4 Smart Glass material for Archviz, CGI, VFX, Cinematic, Commercials and Advertising.
Tested in Unreal Engine versions: UE 4.25, UE 4.26. For use with UE 4.26 just Migrate the materials you want from Materials folder to your project. You can use this material in versions prior 4.25 too - just copy-paste the base material nodes.
The package contains an Unreal Engine 4.25 project that includes:
One Smart Glass material with 5 predefined Instances (see video above). I use the Variant Manager to switch between material instances.