Unreal Engine 4's robust AI system made the job of developer Holospark a lot easier than it would have been otherwise. Earthfall needed to simulate alien behaviour but also that of your companions.

They've been able to take advantage of the behaviour tree system that comes out of the box with Unreal 4. "We have to do a lot of work on simulating a lake full of fish," said O'Farrell.

Free integration released via Unreal Marketplace, lets studios track player behaviour ...