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Posted

Hello,

I want to create a mod where player create a village to gain ressources and more functions. (mod version is 1.18.1)

To start, i want player to right click on a block and spawn the structure like a miner house or the chef house.

I use the function NBT to see what is inside the CompoundTag and understand it. The problem is that I can get data from the Compound only with the compound.get() even if I get Type of the tag, i can't get ListTag even for blocks in the nbt file.

All method to get data from CompoundTag or Tag doesn't work.

Could someone explain or link a solution, a path to understand ?

This is the Structure class that I have created :

package com.tios.villageum.world.structure;

import com.tios.villageum.Villageum;
import net.minecraft.core.BlockPos;
import net.minecraft.nbt.*;
import net.minecraft.network.chat.NbtComponent;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.server.packs.resources.Resource;
import net.minecraft.server.packs.resources.ResourceManager;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.level.levelgen.structure.templatesystem.StructureManager;
import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemplate;

import java.io.*;
import java.util.List;
import java.util.zip.GZIPInputStream;

public class Structure {

    public int length;  // X
    public int height;  // Y
    public int width;   // Z

    protected String fileName;
    protected InputStream fileStream;
    private BlockState[][][] blocks;
    private int[][][] blockData;
    private CompoundTag[] entities;
    private CompoundTag[] tileEntities;

    public Structure(String filename){
        this.fileName = filename;
        this.fileStream = Structure.class.getResourceAsStream("/assets/"+Villageum.MOD_ID+"/structs/" + filename + ".nbt");
    }


    public void createStructure(Level level, BlockPos pos){
    }

    public boolean emptyInSizedSpace(Level level, BlockPos pos) {
        return level.getChunkAt(pos).isEmpty();
    }


    public void readFromFile()
    {
        CompoundTag nbtTagCompound = null;
        DataInputStream dataInputStream;
        try
        {
            dataInputStream = new DataInputStream(new GZIPInputStream(this.fileStream));
            nbtTagCompound = NbtIo.read(dataInputStream);
            dataInputStream.close();
        }
        catch (Exception e)
        {
            System.err.println("Villageum Mod: Error loading structure '" + this.fileName + "'");
            return;
        }

        var keys = nbtTagCompound.getAllKeys();

        var size1 = nbtTagCompound.get("size").getAsString().replace("[","").replace("]","").split(",");
        // In schematics, length is z and width is x. Here it is reversed.
        this.length = Integer.parseInt(size1[0]);
        this.height = Integer.parseInt(size1[1]);
        this.width = Integer.parseInt(size1[2]);

        int size = this.length * this.width * this.height;


        blocks = new BlockState[this.height][this.width][this.length];
        blockData = new int[this.height][this.width][this.length];
        NBT(nbtTagCompound, "blocks");
        var tag = nbtTagCompound.get("blocks");
        byte[] blockIdsByte = nbtTagCompound.getByteArray("blocks");
        byte[] blockDataByte = nbtTagCompound.getByteArray("palette");
        int x = 1, y = 1, z = 1;
        for (int i = 0; i < blockIdsByte.length; i++)
        {
            int blockId = (short) (blockIdsByte[i] & 0xFF);
            blocks[y - 1][z - 1][x - 1] = Block.stateById(blockId);
            blockData[y - 1][z - 1][x - 1] = blockDataByte[i];
            x++;
            if (x > this.length)
            {
                x = 1;
                z++;
            }
            if (z > this.width)
            {
                z = 1;
                y++;
            }
        }

        ListTag entityList = nbtTagCompound.getList("Entities", 10);
        entities = new CompoundTag[entityList.size()];
        for (int i = 0; i < entityList.size(); i++)
            entities[i] = entityList.getCompound(i);

        /*
        ListTag tileEntityList = nbtTagCompound.getList("TileEntities", 10);
        tileEntities = new CompoundTag[tileEntityList.size()];
        for (int i = 0; i < tileEntityList.size(); i++)
            tileEntities[i] = tileEntityList.getCompound(i);*/
    }


    private void NBT(CompoundTag compoundTag,String key){
        var id = compoundTag.getId();
        var keys = compoundTag.getAllKeys();
        var contain = compoundTag.contains(key);
        var tag = compoundTag.get(key);
        var type = tag.getType();
        var astring =tag.getAsString();
    }
}

I am guessing from the import that this is related to StructureTemplates?

Look at the value for StructureTemplate.ENTITIES_TAG and you will see it is all lower case. i.e. you need to change Entities -> entities

 

If that's not the problem, use NBTUtils.prettyPrint() to show the structure of what you are parsing.

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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