Worldgeneration with schematic files[1.7.10]

Androm · July 8, 2014

Hello modders,

I need help with my mod. Can you read schematic files and generate them randomly in the world without converting schematic to java code ? Maybe it is good to read the schematic file into bytes and then set arrays or HashMaps ? Or best with inputStream? And how would you do it ? If you have an idea and a code for the beginning please help me. Thank you.

MultiMote · July 8, 2014

public Schematic get(String schemname){
        try {
            InputStream is = this.getClass().getClassLoader().getResourceAsStream("assets/mymod/schem/"+schemname);
            NBTTagCompound nbtdata = CompressedStreamTools.readCompressed(is);
            short width = nbtdata.getShort("Width");
            short height = nbtdata.getShort("Height");
            short length = nbtdata.getShort("Length");

            byte[] blocks = nbtdata.getByteArray("Blocks");
            byte[] data = nbtdata.getByteArray("Data");


            System.out.println("schem size:" + width + " x " + height + " x " + length);
            NBTTagList tileentities = nbtdata.getTagList("TileEntities", 10);
            is.close();

            return new Schematic(tileentities, width, height, length, blocks, data);
        } catch (Exception e) {
            System.out.println("I can't load schematic, because " + e.toString());
            return null;
        }
    }

    public class Schematic{
        public  NBTTagList tileentities;
        public  short width;
        public  short height;
        public short length;
        public byte[] blocks;
        public byte[] data;
        public Schematic(NBTTagList tileentities, short width, short height, short length, byte[] blocks, byte[] data){
            this.tileentities = tileentities;
            this.width = width;
            this.height = height;
            this.length = length;
            this.blocks = blocks;
            this.data = data;
        }

    }

And it's from my item code, maybe it can help you:

public boolean onItemUse(ItemStack is, EntityPlayer placer, World world, int x, int y, int z, int side, float px, float py, float pz) {

        if(!world.isRemote && !blocked && delay<=0 && side == 1 && placer.capabilities.isCreativeMode){
        blocked = true;
        delay = 20;
        int rotation = OtherUtils.getPlayerRotationSide(placer);
        SchemUtils.Schematic sh = sut.get(schematic);
        if(sh==null){
            placer.addChatMessage(new ChatComponentText("Schematic is dead!"));
            this.setUnlocalizedName("builder_corrupt");
        return false;}

       if(logBuilding)placer.addChatMessage(new ChatComponentText("Building started."));

        int i = 0;
        for(int sy = 0; sy < sh.height; sy++)
        for(int sz = 0; sz < sh.length; sz++)
        for(int sx = 0; sx < sh.width; sx++){

                Block b = Block.getBlockById(sh.blocks[i]);
                if(b!= Blocks.air)
                {
                    int rx = SchemUtils.blockCoordsRotation(sx - this.getxShift(), sz, rotation)[0];
                    int rz = SchemUtils.blockCoordsRotation(sx - this.getxShift(), sz, rotation)[1];
                    world.setBlockToAir(x + rx, y + ylevel + sy, z + rz);
                    world.setBlock(x+rx, y+ylevel+sy, z+rz, b, SchemUtils.rotateMeta(sh.blocks[i], sh.data[i], rotation ), 2);
                }
                i++;
        }

        if (sh.tileentities != null)
        {
            for (int i1 = 0; i1 < sh.tileentities.tagCount(); ++i1)
            {
                NBTTagCompound nbttagcompound4 = sh.tileentities.getCompoundTagAt(i1);
                TileEntity tileentity = TileEntity.createAndLoadEntity(nbttagcompound4);

                if (tileentity != null)
                {
                    int[] conv2 = SchemUtils.blockCoordsRotation(tileentity.xCoord - this.getxShift(), tileentity.zCoord, rotation);
                    tileentity.xCoord = x + conv2[0];
                    tileentity.yCoord += y+ylevel;
                    tileentity.zCoord = z + conv2[1];
                    world.setTileEntity(tileentity.xCoord, tileentity.yCoord, tileentity.zCoord, tileentity);
                }
            }
        }

       if(logBuilding) placer.addChatMessage(new ChatComponentText("Building finished."));
        blocked = false;
        return true;
        }
        return false;
    }

Androm · July 8, 2014

Thank you much! I hope this can help me...

Androm · July 8, 2014

So in data[0] is the data (position, metadata) for the block from blocks[0] stored ?

MultiMote · July 8, 2014

Yes, data[0] is the block[0]'s metadata.

Androm · July 9, 2014

So this would be right in the WorldGenerate method:

for(int chanceForChuk = 0; chanceForChuk < 1; chanceForChuk++) {
        	Schematic spring = SchematicLoader.get("spring");
        	 int i = 0;
             for(int cy = 0; cy < spring.height; cy++)
             for(int cz = 0; cz < spring.length; cz++)
             for(int cx = 0; cx < spring.width; cx++){

                     Block b = Block.getBlockById(spring.blocks[i]);
                     if(b!= Blocks.air)
                     {
                         world.setBlockToAir(cx , cy, cz);
                         world.setBlock(cx, cy, cz, b, Integer.parseInt(String.valueOf(spring.data[i])), 2);
                     }
                     i++;
             }
        }

Or would it be other if cx, cy, cz are my coordinates ? I am new with structure spawning in the world... Thanks for your help

MultiMote · July 9, 2014

Integer.parseInt(String.valueOf(spring.data))

Wtf?

Androm · July 9, 2014

Oh, forget my code, i just write before I test. I read your code carefully but because of your rotationthings i am not sure about it, so how do you can generate a structure with the Schematic and blocks[] and data[] ?

I used Integer.parseINt(String.valueOf(spring.data)); because i needed an integer and Integer.something returns an integer, but i didn´t saw a byte - convert, so i tried to make first a string from the data stored in data and then I tried to get the value of this string.. Very complicated..

MultiMote · July 9, 2014

Your code is correct. And you can pass meta directly, byte normally casts to int (world.setBlock(cx, cy, cz, b, spring.data[і]), 2); ).

And another thing.

Schematic spring = SchematicLoader.get("spring");

Don't forget to add extention to filename if you didnt do it.

Androm · July 9, 2014

I get an error:

my WorldGen code:

package de.MhytRPG.www.worldgen;

import java.util.Random;

import cpw.mods.fml.common.IWorldGenerator;
import de.MhytRPG.www.MhytRPG;
import de.MhytRPG.www.structures.Schematic;
import de.MhytRPG.www.structures.SchematicLoader;
import net.minecraft.block.Block;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraft.world.gen.feature.WorldGenLiquids;
import net.minecraft.world.gen.feature.WorldGenMinable;
import net.minecraft.world.gen.feature.WorldGenerator;

public class WorldGen implements IWorldGenerator{

@Override
public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator, IChunkProvider chunkProvider) {
        switch(world.provider.dimensionId){
        case -1:
            generateNether(world, random, chunkX * 16, chunkZ * 16);
            break;
        case 0:
            generateSurface(world, random, chunkX * 16, chunkZ * 16);
            break;
        case 1:
            generateEnd(world, random, chunkX * 16, chunkZ * 16);
            break;
        }
}

private void generateEnd(World world, Random rand, int chunkX, int chunkZ) {}

private void generateSurface(World world, Random rand, int chunkX, int chunkZ) {
        for(int k = 0; k < 10; k++){
        	int firstBlockXCoord = chunkX + rand.nextInt(16);
        	int firstBlockYCoord = rand.nextInt(200);
        	int firstBlockZCoord = chunkZ + rand.nextInt(16);
        	
        	(new WorldGenLiquids(MhytRPG.blockgoldenwater)).generate(world, rand, firstBlockXCoord, firstBlockYCoord, firstBlockZCoord);
        }
        for(int chanceForChuk = 0; chanceForChuk < 1; chanceForChuk++) {
        	Schematic spring = SchematicLoader.get("spring.schematic");
        	
        	int firstBlockXCoord = chunkX + rand.nextInt(16);
        	int firstBlockYCoord = rand.nextInt(200);
        	int firstBlockZCoord = chunkZ + rand.nextInt(16);
        	
        	 int i = 0;
             for(int cy = 0; cy < spring.height; cy++)
             for(int cz = 0; cz < spring.length; cz++)
             for(int cx = 0; cx < spring.width; cx++){

                     Block b = Block.getBlockById(spring.blocks[i]);
                     if(b!= Blocks.air)
                     {
                         world.setBlockToAir(cx + firstBlockXCoord , cy + firstBlockYCoord, cz + firstBlockZCoord);
                         world.setBlock(cx + firstBlockXCoord, cy + firstBlockYCoord, cz + firstBlockZCoord, b, spring.data[i] , 2);
                     }
                     i++;
             }
        }
}

private void generateNether(World world, Random rand, int chunkX, int chunkZ) {}
}

Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop

at de.MhytRPG.www.worldgen.WorldGen.generateSurface(WorldGen.java:52)

at de.MhytRPG.www.worldgen.WorldGen.generate(WorldGen.java:26)

at cpw.mods.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:106)

at net.minecraft.world.gen.ChunkProviderServer.populate(ChunkProviderServer.java:316)

at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1163)

at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:210)

at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:151)

at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:121)

at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:315)

at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:79)

at net.minecraft.server.integrated.IntegratedServer.startServer(IntegratedServer.java:96)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:455)

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:762)

My Line 52 is: for(int cy = 0; cy < spring.height; cy++)

I don´t really know why, is the spring.height = 0 ?

MultiMote · July 9, 2014

Your your schematic getter returns null. Search in log for "I can't load schematic, because ...".

Androm · July 9, 2014

I didn´t find it. My log (skip the errors with unable loading pngs, because it is something I forgot to add a texture.):

[14:50:58] [main/INFO]: Setting user: ForgeDevName

[14:50:58] [Client thread/INFO]: LWJGL Version: 2.9.1

[14:51:01] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:MhytRPG

[14:51:02] [sound Library Loader/INFO]: Sound engine started

[14:51:03] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas

[14:51:03] [Client thread/ERROR]: Using missing texture, unable to load mhytrpg:textures/items/boundedChain.png

java.io.FileNotFoundException: mhytrpg:textures/items/boundedChain.png

at net.minecraft.client.resources.FallbackResourceManager.getResource(FallbackResourceManager.java:65) ~[FallbackResourceManager.class:?]

at net.minecraft.client.resources.SimpleReloadableResourceManager.getResource(SimpleReloadableResourceManager.java:67) ~[simpleReloadableResourceManager.class:?]

at net.minecraft.client.renderer.texture.TextureMap.loadTextureAtlas(TextureMap.java:126) [TextureMap.class:?]

at net.minecraft.client.renderer.texture.TextureMap.loadTexture(TextureMap.java:91) [TextureMap.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTexture(TextureManager.java:89) [TextureManager.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTickableTexture(TextureManager.java:71) [TextureManager.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTextureMap(TextureManager.java:58) [TextureManager.class:?]

at net.minecraft.client.Minecraft.startGame(Minecraft.java:593) [Minecraft.class:?]

at net.minecraft.client.Minecraft.run(Minecraft.java:941) [Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:164) [Main.class:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_25]

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_25]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_25]

at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_25]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

[14:51:03] [Client thread/INFO]: Created: 256x256 textures/items-atlas

[14:51:03] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:MhytRPG

[14:51:03] [Client thread/ERROR]: Using missing texture, unable to load mhytrpg:textures/items/boundedChain.png

java.io.FileNotFoundException: mhytrpg:textures/items/boundedChain.png

at net.minecraft.client.resources.FallbackResourceManager.getResource(FallbackResourceManager.java:65) ~[FallbackResourceManager.class:?]

at net.minecraft.client.resources.SimpleReloadableResourceManager.getResource(SimpleReloadableResourceManager.java:67) ~[simpleReloadableResourceManager.class:?]

at net.minecraft.client.renderer.texture.TextureMap.loadTextureAtlas(TextureMap.java:126) [TextureMap.class:?]

at net.minecraft.client.renderer.texture.TextureMap.loadTexture(TextureMap.java:91) [TextureMap.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTexture(TextureManager.java:89) [TextureManager.class:?]

at net.minecraft.client.renderer.texture.TextureManager.onResourceManagerReload(TextureManager.java:170) [TextureManager.class:?]

at net.minecraft.client.resources.SimpleReloadableResourceManager.notifyReloadListeners(SimpleReloadableResourceManager.java:134) [simpleReloadableResourceManager.class:?]

at net.minecraft.client.resources.SimpleReloadableResourceManager.reloadResources(SimpleReloadableResourceManager.java:118) [simpleReloadableResourceManager.class:?]

at net.minecraft.client.Minecraft.refreshResources(Minecraft.java:653) [Minecraft.class:?]

at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:303) [FMLClientHandler.class:?]

at net.minecraft.client.Minecraft.startGame(Minecraft.java:596) [Minecraft.class:?]