A few years ago (2012) I was taken aback by the Unreal Engine development process. Their IDE features a running game with all elements being selectable and inte

A few years ago (2012) I was taken aback by the Unreal Engine development process. Their IDE features a running game with all elements being selectable and interactively editable. In one video fragment [1] they hop to Visual Studio where they change gravity. After a few seconds of compilation, the game's code is updated. [1] https://youtu.be/MOvfn1p92_8?t=9m46s https://youtu.be/MOvfn1p92_8?t=9m46s