Read Minecraft Worlds into Unity - Using Substrate.dll

MinecraftReader.cs

// Unity Substrate example
// https://unitycoder.com/blog/2019/10/05/reading-minecraft-world-into-unity-(using-substrate)
// reads chunks and spawns particles as blocks

using UnityEngine;
using Substrate;
using Vector3 = UnityEngine.Vector3;

public class MinecraftReader : MonoBehaviour
{
    // adjust this to read more chunks (but gets too slow eventually)
    int maxChunksToRead = 3;

    public ParticleSystem ps;

    void Start()
    {
        // enter your username, minecraft world name to this full path
        NbtWorld world = NbtWorld.Open(@"C:\Users\YOURNAME\AppData\Roaming\.minecraft\saves\myworld\");
        //Debug.Log("world=" + world);

        int chunkCount = 0;
        int chunkWidth = 16; // used to calculate chunk world offsets

        // iterate chunks
        foreach (ChunkRef chunk in world.GetChunkManager())
        {
            chunkCount++;
            // just to keep unity alive while we use particles..
            if (chunkCount > maxChunksToRead) break;

            // sometimes null blocks?
            if (chunk.Blocks == null) continue;

            // get chunk size
            int xDim = chunk.Blocks.XDim;
            int yDim = chunk.Blocks.YDim;
            int zDim = chunk.Blocks.ZDim;

            // get world position for the chunk
            var chunkRef = chunk.GetChunkRef();
            int cx = chunkRef.X * chunkWidth;
            int cz = chunkRef.Z * chunkWidth;

            // iterate blocks from this chunk
            for (int y = 0; y < yDim; y++)
            {
                for (int x = 0; x < xDim; x++)
                {
                    for (int z = 0; z < zDim; z++)
                    {
                        // get single block
                        AlphaBlock block = chunk.Blocks.GetBlock(x, y, z);

                        // get color based on id
                        byte alpha = 255;

                        byte r = (byte)block.ID;
                        byte g = (byte)block.ID;
                        byte b = (byte)block.ID;

                        // TODO should make lookup table for colors matching the block..
                        // air, skip
                        if (block.ID == 0) continue;
                        // water
                        if (block.ID == 9) { r = 0; g = 84; b = 255; alpha = 128; }; // NOTE alpha not supported in material
                        // cobblestone
                        if (block.ID == 4) { r = 88; g = 88; b = 88; };
                        // stone
                        if (block.ID == 1) { r = 77; g = 77; b = 77; };
                        // grass
                        if (block.ID == 2) { r = 96; g = 144; b = 34; };
                        // log
                        if (block.ID == 17) { r = 90; g = 53; b = 11; };
                        // dirt
                        if (block.ID == 3) { r = 106; g = 68; b = 18; };
                        // leaves
                        if (block.ID == 18) { r = 8; g = 161; b = 0; };

                        // create particle on that position
                        var pars = new ParticleSystem.EmitParams();
                        pars.position = new Vector3(x + cx, y, z + cz);
                        pars.startColor = new Color32(r, g, b, alpha);
                        ps.Emit(pars, 1);
                    }
                }
            }
        }

        Debug.Log("Chunks read=" + chunkCount);
    }
}