structure feature gen

package net.fabricmc.example;

import java.util.Random;

import net.fabricmc.api.ModInitializer;
import net.fabricmc.fabric.api.command.v1.CommandRegistrationCallback;
import net.minecraft.server.command.CommandManager;
import net.minecraft.server.network.ServerPlayerEntity;
import net.minecraft.server.world.ServerWorld;
import net.minecraft.structure.StructurePiece;
import net.minecraft.structure.StructureStart;
import net.minecraft.util.math.BlockBox;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.ChunkPos;
import net.minecraft.util.math.ChunkSectionPos;
import net.minecraft.world.StructureWorldAccess;
import net.minecraft.world.gen.StructureAccessor;
import net.minecraft.world.gen.chunk.ChunkGenerator;
import net.minecraft.world.gen.chunk.StructureConfig;
import net.minecraft.world.gen.feature.DefaultFeatureConfig;
import net.minecraft.world.gen.feature.StructureFeature;

public class TechnicalBlocks implements ModInitializer {

	@Override
	public void onInitialize() {
		CommandRegistrationCallback.EVENT.register((dispatcher, dedicated) -> {
			dispatcher.register(CommandManager.literal("spawnfeature").executes(context -> {

				ServerPlayerEntity player = context.getSource().getPlayer();
				ServerWorld world = (ServerWorld) player.getEntityWorld();
				BlockPos pos = player.getBlockPos();
				ChunkPos chunk = new ChunkPos(pos);

				StructureAccessor accessor = world.getStructureAccessor();
				ChunkGenerator generator = world.getChunkManager().getChunkGenerator();

				StructureFeature<DefaultFeatureConfig> feat = StructureFeature.DESERT_PYRAMID;

				BlockBox box = BlockBox.create(pos.add(-100, -100, -100), pos.add(100, 100, 100));

				StructureStart<?> structureStart = feat.getStructureStartFactory().create(feat, chunk, 1, 0);
				structureStart.init(world.getRegistryManager(), generator, world.getStructureManager(), chunk,
						world.getBiome(pos), null, null);

				structureStart.generateStructure(world, accessor, generator, new Random(), box, chunk);

				return 1;
			}));
		});
	}
}