Take a look at a new in-game dynamic world creation system.
Features:
The project was created for Unreal Engine 4.11
Developer states that Terra Nova is a research project meant for educational purposes, not a release ready project.
The Substance plugin is required to open the project, you can find it for free in the unreal vault or here.
You can also get a packaged build of the dynamic in-game environment builder here.
If you have any questions, you can contact the developer.