Engine Foundation
I started from a working game instead of an empty project.
What: I did not start from an empty project. Epic gives away Lyra, a complete sample game with multiplayer, camera, input and abilities already working and already tested by a lot of people. Starting there skipped months of plumbing, and two people could connect and move around on the first day. Everything since sits beside it rather than inside it. Lyra's own code is something I read and almost never change, and each system on this log, aim, camera, multiplayer connect, the HUD, is a separate piece with its own files. They do not reach into each other. The aiming work knows nothing about the camera work.
Why: Every piece can be pulled out without taking the rest with it.
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