Milestone has released the first developer diary video, in which the development team discusses about the engine powering its new arcade off-road racer, Gravel. Contrary to all of its previous titles, Gravel will be powered by Epic’s engine, the Unreal Engine 4. As the team noted, it decided to use Unreal Engine 4 mainly in order to make significant strides forward from a technological point of view. Therefore, Unreal Engine 4 will allow Milestone to create extremely vast tracks that were really difficulty to make before.
Milestone was also able to manage lighting in a more complete and complex manner. As such, the materials are physically correct and the light itself has properties which are managed by the camera in a physically correct manner. Furthermore, in order to manage track lighting, Milestone is using a third-party plugin called True Sky. With True Sky the developers can manage the position of the sun according to geographic coordinates.
Gravel is currently planned for an early 2018 release.