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Westworld Awakening Viewscreen Effect

Has anyone played Westworld Awakening? If so in it there’s an iPad type device you use to identify wires and interactive objects through walls. As seen: https://venturebeat.com/wp-content/uploads/2019/08/westworld-7.jpg?w=800&resize=800%2C437&strip=all

Or here:

Any idea how they did this? The traditional way to highlight objects in UE4 is to use post processing, but how does one post process in a local viewscreen like that? There’s also a subtle 3d “echo” effect on materials as seen through the viewscreen. Any insights?