I want to know how to add Custom Loot Tables for structures [1.12.2]

[Brokenglass32]

I've been searching for a while and I wanted to know how to create custom loot tables for the chests in my structure and add custom items to the chests in my structure. thank you.

Edited July 28, 2018 by Brokenglass32

[jabelar]

This is loot for your own structure, right? And is your structure coded using classes that extend the StructureComponent class? If so, there is a call for generateChest() that you can override. Also, generally if you've coded your own structure you are free to place blocks however you want, so you can just place a chest however you want.

 

Anyway, it is easier to help if you post the code for your structure that you have already.

[Brokenglass32]

This is how my structure is generated.

the structure comes with a chest, and i want to find out how to generate items in that chest.

 

package com.BrokenGlass32.ImprovedMinecraft.gen;

import java.util.ArrayList;
import java.util.Random;

import com.BrokenGlass32.ImprovedMinecraft.init.ModBlocks;
import net.minecraft.block.Block;
import net.minecraft.init.Biomes;
import net.minecraft.init.Blocks;
import net.minecraft.init.Items;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntityChest;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraft.world.WorldType;
import net.minecraft.world.biome.BiomeDesert; 
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraft.world.gen.IChunkGenerator;
import net.minecraft.world.gen.feature.WorldGenerator;
import net.minecraftforge.fml.common.IWorldGenerator;
import scala.actors.threadpool.Arrays;

public class WorldGenCustomStructures implements IWorldGenerator
{

    @Override
    public void generate(Random random, int chunkX, int chunkZ, World world, IChunkGenerator chunkGenerator, IChunkProvider chunkProvider) 
    {
        switch(world.provider.getDimension())
        {
        case 2:
            
            break;
            
        case 1:
            
            break;
            
        case 0:
            
            this.generateStructureSandStoneHouseOne(new WorldGenStructure("sandstonehouse_structure_1"), world, random, chunkX, chunkZ, 75, Blocks.SAND, BiomeDesert.class);                              
            break;
        
        case -1:
            
        }
    }
    
    private void generateStructureSandStoneHouseOne(WorldGenerator generator, World world, Random random, int chunkX, int chunkZ, int chance, Block topBlock, Class<?>... classes)
    {
        ArrayList<Class<?>> classesList = new ArrayList<Class<?>>(Arrays.asList(classes));
        
        int x = (chunkX * 16) + random.nextInt(15) + 8;
        int z = (chunkZ * 16) + random.nextInt(15) + 8;
        int y = calculateGenerationHeight(world, x, z, topBlock);
        BlockPos pos = new BlockPos(x,y,z);
        
        Class<?> biome = world.provider.getBiomeForCoords(pos).getClass();
        
        if(world.getWorldType() != WorldType.FLAT)
        {
            if(classesList.contains(biome))
            {
                if(random.nextInt(chance) == 0)
                {
                    generator.generate(world, random, pos);
                }
            }
        }
    }
    private static int calculateGenerationHeight(World world, int x, int z, Block topBlock)
    {
        int y = world.getHeight();
        boolean foundGround = false;
        
        while(!foundGround && y-- >= 0)
        {
            Block block = world.getBlockState(new BlockPos(x,y,z)).getBlock();
            foundGround = block == topBlock;
        }
        
        return y;
    }
}

Sorry for the very late response, and thank you for the reply.

Edited July 28, 2018 by Brokenglass32

[jabelar]

What's in the WorldGenStructure class? Is that your own class -- I can't find that class in the vanilla or forge source...

 

Anyway, the basic structure template format doesn't directly allow loot tables to get into the generated chests. But you can mark the chests by adding data blocks to your structure, then when you generate the structure you can loop through the data blocks and use them for additional processing. For example, you could put a data block right on top of the chest block to mark the position and then use that to find the tileentity for the chest when it generates and add the loot table directly at that point.

 

There might be a simpler way, but that seems to be the way some other people have solved this problem.

[IceMetalPunk]

26 minutes ago, jabelar said:

There might be a simpler way, but that seems to be the way some other people have solved this problem.

To be fair, that seems to be the way Mojang has solved this problem, too XD It's kind of the only reason the Data Mode of structure blocks even exists.