Google Poly Unreal SDK by Google is a (C++) plugin for the Unity engine that allows you to import 3D assets from Google Poly at edit time and at runtime.
The Google Poly API is an API that provides read access to assets in the Poly library. Poly is an online library where people can browse, share, and remix 3D assets. An asset is a 3D model or scene created using Tilt Brush, Blocks, or any 3D program that produces a file that can be uploaded to Poly. Many assets are licensed under the CC BY license, which means developers can use them in their apps, free of charge, as long as the creator is given credit. There are thousands of assets available for use at poly.google.com.
Unreal (Engine ) is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.