[Request] Mark chunks for "Regenerate Terrain Features"

[VL4DST3R]

As I am sure you know, the Minecraft world generator generates the "natural" terrain and the terrain features like trees, villages, ice, snow etc. in separate passes.

Here is an example, notice the tree line and sand patches stopping one chunk before the actual last generated chunk:

This is done to account for potential structures that stretch beyond the current chunk they originate from and prevent them from getting truncated.

The problem comes when deleting a chunk with MCA Selector, you are inevitably removing this buffer line of chunks, so any structure that got cut by it is now cut for good.

You can notice this the easiest in any previously "cut" forest:

and in-game:

Would it be possible either manually or (ideally) automatically flag the neighboring chunks from a deleted section as such, so that the area may get properly regenerated in-game?

I know that those buffer chunks are internally marked differently, and in the past tools like MCEdit even visualized them to indicate their special state.

[DereC4]

Use "forceBlend: true"

This fixes the uneven chunk borders and was secretly added by Mojang around 1.17, it is a bit wacky tho but using mcaselector you can control which chunks will use it

https://www.youtube.com/watch?v=1fFqgbMX8lk

[VL4DST3R]

How do I use this exactly? Deleting and letting it regenerate is exactly how I got the above tree line bug to show up in the first place to take my screenshots, so I don't see how that is supposed to work. Digging around mcaselector I eventually found an option under Tools > Change Fields to edit the nbt data of chunks but but the field there is empty and takes any value inside, so I doubt this is the intended way to do it? What is the proper usage?

[DereC4]

How do I use this exactly? Deleting and letting it regenerate is exactly how I got the above tree line bug to show up in the first place to take my screenshots, so I don't see how that is supposed to work. Digging around mcaselector I eventually found an option under Tools > Change Fields to edit the nbt data of chunks but but the field there is empty and takes any value inside, so I doubt this is the intended way to do it? What is the proper usage?

yea it is under the change fields option i think the video had it ? lemme see... oh, i did not demonstrate in that vid specifically oops. I was planning to make a new video on it. But you go in change fields, and under forceBlend you set it to 'true'

This reddit comment helped

Specifically, the issue with the leaves is just something you'll have to accept and worldedit, since trees are generated not as part of the terrain but separate, as are some "features" (literally called features in the code)

A small trade off in my opinion for the terrain itself staying connected and everything unlike the chunk boundaries we had for many many years

[VL4DST3R]

Yeah no that's true, and the blend added by the game is very nifty when updating seeds, but my main worry was that if we trim our worlds to save on space, and then end up exploring thoses area again, we will inevitably leave scars behind, which kinda disincentivizes me to attempt pruning unused chunks at all.