How to manipulate data?

[alex4200]

I want to use this module to manipulate data in an existing world, i.e. I want to do something like:

region = anvil.Region.from_file("r.0.0.mc")

# Create `Block` objects that are used to set blocks
dirt = anvil.Block('minecraft', 'dirt')

# Make a 16x16x16 cube of either stone or dirt blocks
for y in range(16):
    for z in range(16):
        for x in range(16):
            region.set_block(stone, x, y, z)

but that does not seem to be possible, as the region object is read only.

Can that be fixed please?

[GuillaudRemy]

I wanted to ask the same question

[alex4200]

@GuillaudRemy Since I did not find any answer either I used the code of this repository as a basis in order to create a new repository which enables you to manipulate the data in a minecraft world:

https://github.com/alex4200/PyBlock

It is still in a draft version, but if you want to give it a try that would be great. And if you find some issues etc., please file a bug report.

That code not only allows you to manipulate data, but you can also search certain blocks, you can list all blocks in some certain area, and you can copy chunks even from different worlds in your world!

[GuillaudRemy]

Thanks i will definitly check it out but i was trying to do it myself but i'm not familiar with this bytes reading how do i read those bytes string out cause i can't figure it out ?

[matcool]

there isn't any easy way to convert a readonly Region or Chunk into its Empty counterpart, yet

[UncleThaodan]

I don't understand why Region and EmptyRegion are completely separate classes, but I did find a workaround:

region_in = anvil.Region.from_file(region_name)
region_out = anvil.EmptyRegion(x, y)
for x in range(0, 32):
    for y in range(0, 32):
        try:
            chunk = anvil.Chunk.from_region(region_in, x, y)
            for tag in chunk.data.tags:
                if tag.name == 'Biomes':
                    tag.value = [biome_mapping.get(val, val) for val in tag.value]
                    break
            region_out.add_chunk(chunk)
        except ChunkNotFound:
            pass
region_out.save(region_name)

In this example i'm replacing all the biome IDs according to the biome_mapping dictionary. Definitely not the fastest since there is a lot of copying involved and about 1 million iterations per region, but it works in a pinch.