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How does Superflat customization work in 1.17?

Falsified_ 8/24/21 8:39 am
1.5k
8/25/2021 8:12 am
I'm currently trying to get things like biome-specific structures, decorations/ore generation, and village size/distance to work. When I try to put these things into the preset bar, it deletes itself. Did the syntax get changed again?
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Falsified_
Level 1 : New Miner
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TheDiamondPlayables
08/24/2021 10:54 pm
Level 84 : Elite Programmer
history
Due to the new custom worldgen being worked on (and presumably Mojang didn't see what would happen if this were to mix with Superflat settings), old superflat can only change the layers.

If you select a preset, you keep the other settings on that preset, no matter what. (Except from the layers)
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super026anthony
08/24/2021 8:51 am
Level 10 : Journeyman System
Here are some things that you may have put wrong.
A. You clicked Cancel instead of Use Preset. Make sure you click Use Preset.
B. The ID's for the blocks are wrong or you are not putting minecraft: in front of it. If you don't know what the ID's are, check the Official Minecraft Wiki.
C. You put more than 256 lines or less than 1 line of preset. In 1.17, they moved bedrock to y: 0, and the height limit (this has always been here) is 256. Make sure you are putting less or equal to 256 and more or equal to 1.
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Falsified_
08/24/2021 8:59 am
Level 1 : New Miner
Everything's in order and is going right, but it's the structure/decoration/ore generation parts that refuse to work. I can't find anything on if they changed how the superflat preset string works or not so I have no idea.
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super026anthony
08/25/2021 8:12 am
Level 10 : Journeyman System
There is not ore generation, underground structures, or anything like that in superflat.
1
Silly_Salilation
08/24/2021 10:35 pm
Level 1 : New Miner
history
maybe you could try the overworld preset, then edit the blocks? also maybe you could try this: https://minecraft.tools/en/flat.php?preset=3


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