Hey people,

how can I make that a block kills all mobs in a radius of x blocks?

Please answer me

Yes, but you would need to have a tile entity to do so constantly.

 

Another option is to have a non-tile entity block that kills all mobs in x radius whenever it is randomly ticked.

the second sounds good. But how can I do it? Do u have an idea?

import java.util.Iterator;
import java.util.List;
import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.monster.EntityMob;
import net.minecraft.entity.monster.IMob;
import net.minecraft.world.World;

public class KillerBlock extends Block {

public KillerBlock(Material p_i45394_1_) {
	super(p_i45394_1_);
	this.setTickRandomly(true);
}

    public void updateTick(World par1World, int par2, int par3, int par4, Random par5Random)
    {
    	double u=10;//change this to whatever you want to do
    	List l=par1World.selectEntitiesWithinAABB(EntityLivingBase.class, this.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4).expand(u, u, u),IMob.mobSelector);//this won't kill creepers as Imob.mobSelector doesn't select them.
    	//List l=par1World.getEntitiesWithinAABB(EntityMob.class, this.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4).expand(u, u, u));//this will select all hostile creatures. replace EntityMob with EntityLiving to kill all non-Player living entitys, and replace it with entitylivingbase to kill all living entites including players.

    	Iterator i=l.iterator();
    	while (i.hasNext())
    	{
    		((EntityLivingBase)i.next()).setHealth(0);
    	}
    }

}

MC's random tick speed it a little slow, so in order to get a frequent kill burst you might need to use multiple blocks.

thank you very much

And what about a tile entity? It works with random tick but its very slow. Are you so nice and give me an example?

    	   GameRegistry.registerTileEntity(TileEntityKillStuff.class, baseclass.modid+"killerTileEntity");

import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class TileEntityKillStuff extends TileEntity{
   
@Override
public void writeToNBT(NBTTagCompound par1)
{
  	    super.writeToNBT(par1);
}

public void updateEntity()
{
	if(this.worldObj.rand.nextInt(5)==0)/*Change the value of the 5 to increase or decrees the chance of an update tick, or remove the entire if statement to give a 100% chance*/
	{
		this.blockType.updateTick(worldObj, xCoord, yCoord, zCoord, this.worldObj.rand);
	}
}

@Override
public void readFromNBT(NBTTagCompound par1)
{
	     super.readFromNBT(par1);
}
}

import java.util.Iterator;
import java.util.List;
import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.monster.EntityMob;
import net.minecraft.entity.monster.IMob;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class KillerBlock extends Block {

public KillerBlock(Material p_i45394_1_) {
	super(p_i45394_1_);
	this.setTickRandomly(true);
}
public TileEntity createTileEntity(World world, int metadata)
{
   return new TileEntityKillStuff();
}
    public void updateTick(World par1World, int par2, int par3, int par4, Random par5Random)
    {
    	double u=10;//change this to whatever you want to do
    	List l=par1World.selectEntitiesWithinAABB(EntityLivingBase.class, this.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4).expand(u, u, u),IMob.mobSelector);//this won't kill creepers as Imob.mobSelector doesn't select them.
    	//List l=par1World.getEntitiesWithinAABB(EntityMob.class, this.getCollisionBoundingBoxFromPool(par1World, par2, par3, par4).expand(u, u, u));//this will select all hostile creatures. replace EntityMob with EntityLiving to kill all non-Player living entitys, and replace it with entitylivingbase to kill all living entites including players.

    	Iterator i=l.iterator();
    	while (i.hasNext())
    	{
    		((EntityLivingBase)i.next()).setHealth(0);
    	}
    }

}

I don't know why, but it doesn't work . When I place the block and skeletons there, they don't die. What value I have to set (this.worldObj.rand.nextInt(5) if I want that the block kills the mobs every second?

Have you tried using [println] methods to check if the method is actually calling?