The Alembic file format (ABC) is an open computer graphics interchange framework that distills complex, animated scenes into a non-procedural, application-independent set of baked geometric results. Unreal Engine 4 (UE4) enables you to import your Alembic files through the Alembic Importer, which gives you the freedom to create complex animations externally, then bring them into UE4 and render them in real-time.