Unreal Engine 4 - GT.TV Exclusive Development Walkthrough
GameTrailers1 HN recommender · recommended in 1 month, 2015–2016
demo · intermediate · 2015–2016 on HN
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.
Up next
10 mo on HNOverwatch Gameplay Architecture and Netcode
GDC Festival of Gaming
16 HN recommender · 2019–2025
9 mo on HNRustConf 2018 - Closing Keynote - Using Rust For Game Development by Catherine West
Rust Programming Language
9 HN recommender · 2018–2023
9 mo on HNA Deep Dive into Nanite Virtualized Geometry
SIGGRAPH Advances in Real-Time Rendering
7 HN recommender · 2021–2026
9 mo on HNHow Crash Bandicoot Hacked The Original Playstation | War Stories | Ars Technica
Ars Technica
13 HN recommender · 2020–2026
9 mo on HNJonathan Blow - How to program independent games - CSUA Speech
Alexandre Franco
9 HN recommender · 2015–2026
9 mo on HNIdeas about a new programming language for games.
Jonathan Blow
7 HN recommender · 2014–2025
7 mo on HNExploring the Tech and Design of Noita
GDC Festival of Gaming
7 HN recommender · 2020–2026
8 mo on HNCasey Muratori – The Big OOPs: Anatomy of a Thirty-five-year Mistake – BSC 2025
Better Software Conference
11 HN recommender · 2025–2026
7 mo on HNMiguel de Icaza: Swift Godot: Fixing the Multi-million dollar mistake #GodotCon2023
Godot Engine
6 HN recommender · 2023–2026
7 mo on HNQuakeCon 2012 - John Carmack Keynote
QuakeCon Official
6 HN recommender · 2012–2018
5 mo on HNCreating a Doom-style 3D engine in C
Bisqwit
3 HN recommender · 2015–2019
6 mo on HNInteractive programming Flappy Bird in ClojureScript
Bruce Hauman
6 HN recommender · 2015–2020
3 comments from Hacker News
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!
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