Unity and Epic Demonstrate Unity Running Inside Unreal Engine

Unity showed the Fantasy Kingdom sample simulated in Unity while Unreal handled real-time rendering, with physics, lighting and input synchronized through a client-server protocol called PolySpatial. Unity says early-access consideration is planned for 2027.

Why it matters

This is an unusual development for the engine ecosystem. It points toward more interoperable production pipelines where teams may choose different technologies for different parts of a project rather than treating engine boundaries as absolute.