[Question] Biome Replacement Conditions

[joex92]

Hi, I'm still a bit of a noob to Java programming, also I don't know how Minecraft's world generation works.
But I have a question, is it possible to use this plugin's code in a way so biomes are replaced based on the chunk's blocks data or the biome's area data?
I'm using the plugin VoidGen to populate a world generated with WorldPainter, but even when the biomes have been set on the world, when loading the world on Minecraft, the biomes are replaced by whatever the world's seed is... So, for example, I have a bast ocean which has many biomes set because of the seed, so I would want to replace those chunk's biomes that the top blocks are mostly, or entirely, water to a ocean biome... The same way with high mountains (that goes up to 200 height) to mountain/snowy biomes... So basically replace the biomes based on the world's data giving it some rules according to the percentage of the quantity of the top blocks and its data (like the height)... would this be possible?

[lulu2002]

We can split this question to two part:

1. You just want to change the biome itself, ignore the generation part
Yes, it's complete possible, but it's not this plugin's business.

You can look at the command that WorldEdit plugin provides, by using //setbiome <BIOME> to your selection, the biome immediately changes to what you want. BUT it's wont make terrain regenerates or something else changes the looking (expect grass color)

2. You want the both (Terrain + Biome)
I'm sorry, this might be impossible to do (or it's really hard).

This plugin is original made for UHC, because we want those "bad biomes" never exist and cause bad gaming experience, so the way this plugin replacing biomes is by changing the biome mapping, like the examples below:

Original:
["Ocean", BiomeOcean()]

Modified:
["Ocean", BiomeDesert()]

By doing this, each time the server generates new "Ocean" chunk, mapping always returns BiomeDesert() instance, in other words, this plugin cheats the server's generation system.

And we all know, Minecraft's generation is always one biome per chunks, Y axis doesn't matter, this is why I think it's impossible.

[joex92]

Ok, I understand... so your plugin modifies the mc world generation mapping before the chunks are even loaded... but, when a new chunk is generated, what's the order of things for the minecraft world generation? doesn't the MC World Generation first generate the terrain, then apply the Biome, then populate?
I don't want to change the terrain itself, neither apply biome on specific Y level (i know the biomes are set on XZ areas), I just want to change the biome according to the chunk's already existing terrain... like this:

• new chunk is loaded (the chunk already have terrain with no population, is a world generated with WorldPainter)
• check the average top block in the chunk (I believe there is a method function in the mc api to check the top block)
• replace the biome to another one according to the average top block in the chunk
• then let the world generation do its thing (populate the chunk in this case), for this last step I'm using VoidGen, which skips the MC terrain generation and it just populate the chunk (it has an option to populate), so it only populates on top of the terrain that already exists...

Do you think this is possible? or would this require to develop a new world generation plugin? because what I need is a way to set biomes according to the already existing terrain in the worldmap... do you know if there is something like that already developed?
I know that things like this exist on the modded side of minecraft, but this is for a nonmodded server, and prepopulating a big world and then uploading it it's just too much, it took me 3 days just to generate the world itself (just terrain) that I'm using and the VoidGen plugin helped me a lot, because it skips the terrain generation and just populates, but it populates according to a seed (because it only skips the vanilla terrain generation), so there are some places that makes no sense, like a big ocean filled with a variety of biomes and no ocean-ish things like sea grass or corals, etc...