Unreal Engine 4 - GT.TV Exclusive Development Walkthrough
GameTrailers1 HN recommender · recommended in 1 month, 2015-2016
972K views · 14 years ago · demo · dated
A GameTrailers walkthrough from E3 2012 of an Unreal Engine 4 real-time tech demo with Epic's Alan Willard. It shows live code changes and hot reloading while the game runs.
HN cites it as a favorite demo of live coding and hot reload in a game engine.
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3 comments from Hacker News
I believe that on Unreal Engine 4, you use C++ and it does have a feature that mimics "live coding" where it recompiles and hot-reload your game even while playing. edit: here it is ▶ this video (jump to 9:40 if it doesn't load at this point automatically)
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] ▶ this video
This is my favorite Unreal 4 demo - ▶ this video (sadly missing the wonderful quote "I light my level by dropping a sun in.") I'm completely in awe of the feedback loop here. It even compiles and swaps code while you're in the game!