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this post was submitted on 14 Sep 2023
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I mean it's easy to reimplement entire games if you've built it modularly. Just swap your core game logic to run on another library and the game works the same it did before.
Edit: 'course, exceptions exist like if you wrote everything using their proprietary coding language, instead of using something universal.
Edit 2: It MAY still be possible that a translation/compiler exists that'll run as a plugin in a proprietary engine, and converts it into something universal.
Game Dev isnt just code. Remaking a project from scratch is a massive undertaking. Porting the code could be difficult too especially if relying on core unity libraries.
Not downplaying the effort, it still takes time. But not impossible.
How you made it all matters in situations like this.
Technically you’re not wrong. The work is done, the logic already exists.
But systems like Unity aren’t like other code where you can rip one section out and still have 80% of a working codebase. Game engines are as fundamental to most of their game code as the language it’s written in. It’s not like you can just drop things into unreal or godot, connect a few interfaces and call it good. You still have to write the whole thing from the ground up.
As I said, it depends on how it's built. And how proprietqry the engine is.
Unity from what I know supports universal code/mesh/texture formats, but if the devs opted for the "easier to use" proprietary systems- well, that's a problem.
Now what I don't know is how easy are scenes to export in Unity. They're probably built with Blender or something else though in most cases, unless Unity has drastically changed.
Assets are safe, but they often need to be re-rigged or re-formatted. It’s still a non-trivial task though. Levels will need to be rebuilt, open worlds have to be started almost from scratch, and a lot of other things I can’t think of off the top of my head.
The real problem is underlying systems. Unity often handles networking, render engines, game logic and most other things. The reason Unity was so popular was because it was easy to use (and free). Game code will need to be at minimum heavily refactored, if not rewritten, as anything that interfaces with the engine needs to be changed over. Just like you can’t just port c++ -> c# without major changes, you can’t port a game engine without major changes too.
Unless theyve built everything as a separate code bundle, only interacting with the engine at a bare minimum, there’s no way to change with minor impact. It’ll be a huge project that will also require the engineers to learn a new stack that behaves differently, further slowing down the process.
I’ve written game engine wrappers and converters for all sorts of code and file types.
It would honestly be easier to fire up Unreal Engine 5 or Godot and start again.
Well I'd say that was true 5 years ago. Is it still? I'd not be so sure.
Small projects might as well start from scratch.
But projects with years of devtime are best ported.
The surface area is huge. This is not an SQL database where you can just change the ORM's backend.
Depends how it's built.
If you don't use anything from the engine itself, implement everything from scratch, only using the engine as an entry point that launches your own code, and pay unity two thousand dollars per year per seat for that privilege - I guess porting should be fairly easy.
If you ask me engines should be free for most indies (UE, Godot?), because they're not making millions. But yeah. I get it's not feasible for most new devs especially, and senior devs have better things to focus on.
It's more a code principle you'd stand behind.
It also depends on how many engine unique features you used, and what optimizations you applied. It's certainly possible, but doing it without changing any game logic will require very complicated translation layers which will likely cause performance issues. It might very well be easier to treat it as a porting and refactoring project. You might not even realize which behaviors are unique to each engine if you don't regularly develop in multiple engines.
This is true, and I vouch for gamedevs to first test other engines to see the differences.
Calculating for the future is extremely important in pretty much everything.
Also I wouldn't say there would be performance issues, unless you somehow completely screw up coding and compiling said code.
Projects should work on top of a bottom layer, or translation layer as it's sometimes called; game logic calls for functions from there, instead of directly from the engine. This is also important for code security.
_move_entity might be calling the proprietary unity_move_object with a different reg stack, but when compiled the performance should be +/- 0.
The things you are suggesting are adding complexity and therefore cost.
It does take a higher level of expertise to adequately abstract away engine specific limitations and requirements.
It's again an even higher level of expertise and therefore expenditure to account for performance issues with these abstractions.
Not untrue, but it helps to adapt your future projects if done in such a way.
It does require more expertise, and it takes more time, thus it'd have to be the first thing done for the project, not something you do after everything's done already.