One of the most significant issues for a director is the lack of visual representation of the final film while still in the studio or out on a location somewhere.
While game engine renderers and the hardware behind them improve significantly over the past 20 years; there has always been a marked drop in the quality of live renders over the renders the post-production workflows used in films.
And while there is still a quality gap at the moment, the quality gap between the games engine quality and the pre-rendered option is getting close enough that it is helping to provide real-time decision making and subject lighting straight out of the camera.
The delivery of greenscreen footage alongside the preferred director’s games engine vision also helps the post guys as it reduces the guesswork of the directors “vision” and therefore, the back and forth of changes.
Find out more here: https://www.unrealengine.com/en-US/spotlights/virtual-production-putting-the-latest-ue4-tools-through-their-paces?fbclid=IwAR1C42qVM-Ee00nB3ZVp3fAHc8ISUfdESE5KHTHJNHjBuVoF20VLbNsDlVg