What happens on uninstall?

[meedstrom]

Is the mod intended to be removable from an existing world?

It's hard to try mods that do not clarify this, because I've never created a second world and am not about to start.

In particular, what happens to those rooted dirt blocks?

[Groupix05]

Dynamic trees add new blocks: rooted dirt, dynamic trees log, dynamic leaves and other. So if you remove the mod, every dynamic trees will be removed, with the rooted dirt below it

[meedstrom]

Ah. Thank you.

I'm surprised so many MC players are fine with starting over on new worlds all the time just to try different mods.

Could there be a pre-uninstall function called say /dynamictrees revert that converts the custom blocks to vanilla blocks? Is that implementable in principle, at least?

I realize there might be issues with blocks far outside the render distance, so maybe it needs save-file editing?

[Groupix05]

It's like every mods that add new stuff, if you remove it, it can corrupt your world or just remove every block in your world from that mod. That's how modding work.

I don't think a lot of MC players start a world without knowing the mod before. I'm a modpack creator, and I always test the mod a bit in survival and creative before knowing if I add it or not. I never start my survival game with my friends without knowing what the mod do.

And for what dynamic trees do is pretty clear, in the description and screenshots, it adds dynamic growing trees.
And btw, why do you want to remove it ?

[meedstrom]

I don't want to remove it, I haven't started using it! ;)

Rather, I want to try it for a while on my forever world, generate a bunch of chunks like that, then have the option to change my mind.

Does that make sense? It's not just to find out what it does. I think it'd take me months to really know if I want it forever, so to have to rollback months of progress if I change my mind? Nah. And then I may as well quit minecraft, as that was my only world.

That's how modding work.

Indeed, but mods could clean up after themselves if they cared to. All the mods in Fabulously Optimized modpack are totally fine to remove, for instance. It's just worldgen mods that don't have a culture of being removable, it seems.

[Groupix05]

The modpack Fabulously Optimized only uses client side mods, and do nothing on the world itself. You can play on vanilla servers with it. Dynamic Trees, and other mods, need to be on the server to work, because they change how minecraft generate stuff. I really dont recommend installing stuff like that on your forever world if you are not sure about it. It's like the majority of mods that adds custom stuff. Test it on a creative world to check if it's cool, to check if you like.

Some server mods just use vanilla stuff, so you are fine if you remove them, like Terralith (and btw it's just a datapack). But dynamic trees use custom blocks and logic that cannot be removed with a simple command, it would require DT to scan the whole world and replace stuff with vanilla ones, and there are certainly some other difficulties of doing like that, im not a mod developer. And they prefer to work on features, bug fixes, ... instead of working on something to remove their mod. If you want to remove them you will need to use a save editor or something like that.