How to add custom structure (I have nbt file in data/mymod/structures)? Can you give answer for 1.16.1, please?

Learn about features, and then structures. IglooStructure and IglooPieces are a good basic introduction to creating structures with nbt data.

package com.twmicro.practical.world.gen.structures;

import com.mojang.serialization.Codec;
import com.twmicro.practical.PracticalMod;
import com.twmicro.practical.Reference;
import com.twmicro.practical.world.gen.structures.pieces.ModernRubyFactoryPiece;
import net.minecraft.util.Rotation;
import net.minecraft.util.SharedSeedRandom;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.ChunkPos;
import net.minecraft.util.math.MutableBoundingBox;
import net.minecraft.world.IWorldReader;
import net.minecraft.world.biome.Biome;
import net.minecraft.world.biome.provider.BiomeProvider;
import net.minecraft.world.gen.ChunkGenerator;
import net.minecraft.world.gen.GenerationStage;
import net.minecraft.world.gen.feature.IFeatureConfig;
import net.minecraft.world.gen.feature.NoFeatureConfig;
import net.minecraft.world.gen.feature.structure.*;
import net.minecraft.world.gen.feature.template.TemplateManager;
import net.minecraft.world.gen.settings.StructureSeparationSettings;

import javax.annotation.Nullable;

public class ModernRubyFactory extends Structure<NoFeatureConfig> {
    public ModernRubyFactory(Codec<NoFeatureConfig> codec) {
        super(codec);
    }

    @Override
    public String getStructureName() {
        return Reference.MODERN_RUBY_FACTORY_LOCATION.toString();
    }

    @Override
    public GenerationStage.Decoration func_236396_f_() {
        return GenerationStage.Decoration.SURFACE_STRUCTURES;
    }

    @Nullable
    @Override
    public BlockPos func_236388_a_(IWorldReader p_236388_1_, StructureManager p_236388_2_, BlockPos p_236388_3_, int p_236388_4_, boolean p_236388_5_, long p_236388_6_, StructureSeparationSettings p_236388_8_) {
        return super.func_236388_a_(p_236388_1_, p_236388_2_, p_236388_3_, p_236388_4_, p_236388_5_, p_236388_6_, p_236388_8_);
    }

    @Override
    public Structure.IStartFactory<NoFeatureConfig> getStartFactory() {
        return ModernRubyFactory.Start::new;
    }

    public static class Start extends StructureStart<NoFeatureConfig> {

        public Start(Structure<NoFeatureConfig> p_i225806_1_, int p_i225806_2_, int p_i225806_3_, MutableBoundingBox p_i225806_4_, int p_i225806_5_, long p_i225806_6_) {
            super(p_i225806_1_, p_i225806_2_, p_i225806_3_, p_i225806_4_, p_i225806_5_, p_i225806_6_);
        }

        @Override
        public void func_230364_a_(ChunkGenerator p_230364_1_, TemplateManager p_230364_2_, int p_230364_3_, int p_230364_4_, Biome p_230364_5_, NoFeatureConfig p_230364_6_) {
            int i = p_230364_3_ * 16;
            int j = p_230364_4_ * 16;
            BlockPos blockpos = new BlockPos(i, 90, j);
            Rotation rotation = Rotation.randomRotation(this.rand);
            ModernRubyFactoryPiece.func_236991_a_(p_230364_2_, blockpos, rotation, this.components, this.rand);
            this.recalculateStructureSize();
        }
    }
}

First attempt xD. Please, don't care of name of structure!

 

Also Minecraft writes to log two types of messages:

[11:47:36] [Server thread/ERROR] [minecraft/ChunkManager]: Failed to save chunk -2,-1
java.lang.NullPointerException: null
	at net.minecraft.world.chunk.storage.ChunkSerializer.writeStructures(ChunkSerializer.java:421) ~[?:?] {re:classloading}
	at net.minecraft.world.chunk.storage.ChunkSerializer.write(ChunkSerializer.java:363) ~[?:?] {re:classloading}
	at net.minecraft.world.server.ChunkManager.func_219229_a(ChunkManager.java:705) ~[?:?] {re:classloading}
	at net.minecraft.world.server.ChunkManager.lambda$save$9(ChunkManager.java:374) ~[?:?] {re:classloading}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[?:1.8.0_251] {}
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_251] {}
	at java.util.Iterator.forEachRemaining(Iterator.java:116) ~[?:1.8.0_251] {}
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[?:1.8.0_251] {}
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_251] {}
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_251] {}
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:1.8.0_251] {}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:1.8.0_251] {}
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_251] {}
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[?:1.8.0_251] {}
	at net.minecraft.world.server.ChunkManager.save(ChunkManager.java:371) ~[?:?] {re:classloading}
	at net.minecraft.world.server.ServerChunkProvider.save(ServerChunkProvider.java:313) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.world.server.ServerWorld.save(ServerWorld.java:703) ~[?:?] {re:classloading}
	at net.minecraft.server.MinecraftServer.save(MinecraftServer.java:546) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:82) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:665) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.lambda$func_240784_a_$0(MinecraftServer.java:231) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251] {}

Unknown structure start: practical:modern_ruby_factory

 

Edited July 9, 20205 yr by PFEModder
LOG

I have the same problem on 1.16.3 with nearly the same code. Did you find a solution?

There's a BiMap you need to add your structure to within Structure along with registering it as a feature and structure.

Looks like I found a good example: https://gitlab.cameronwhyte.me/heroes-united/heroes-united/-/blob/master/src/main/java/xyz/heroesunited/heroesunited/HeroesUnited.java