WorldGenFire.java

package net.minecraft.world.gen.feature;

import java.util.Random;
import net.minecraft.block.Block;
import net.minecraft.world.World;

public class WorldGenFire extends WorldGenerator
{
    public boolean generate(World par1World, Random par2Random, int par3, int par4, int par5)
    {
        for (int l = 0; l < 64; ++l)
        {
            int i1 = par3 + par2Random.nextInt(8) - par2Random.nextInt(8);
            int j1 = par4 + par2Random.nextInt(4) - par2Random.nextInt(4);
            int k1 = par5 + par2Random.nextInt(8) - par2Random.nextInt(8);

            if (par1World.isAirBlock(i1, j1, k1) && par1World.getBlockId(i1, j1 - 1, k1) == Block.netherrack.blockID)
            {
                par1World.setBlock(i1, j1, k1, Block.fire.blockID, 0, 2);
            }
        }

        return true;
    }
}