hi, i'm building a mob with a block that needs to detect when a hostile mob stands on it, and kill the mob. i have absolutely no idea how to do this or even where to start could somebody point me in the right direction please?

Hi

 

If you want to kill the mob instantly you can kill it in the block's onEntityWalking(World world, int x, int y, int z, Entity entity) method.

@Override
public void onEntityWalking(World world, int x, int y, int z, Entity entity)
{
    entity.setDead(); // or something like that.
}

 

I hope you can find some entity detection releated stuff in the vanilla pressure plate's code.

You can check if the entity is a mob by doing this:

@Override
public void onEntityWalking(World world, int x, int y, int z, Entity entity)
{
    if (entity instanceof EntityMob) {
        entity.setDead(); // or something like that.
    }
}

You can also make the block have a shorter physics hull than rendering hull (think soul sand) and use onEntityCollideWithBlock.

 

https://github.com/Draco18s/Artifacts/blob/master/draco18s/artifacts/block/BlockQuickSand.java

 

You will need the physics hull to be at least 1% smaller than the actual hull, or the collision won't be detected on every side that you wish for the damage to be dealt (linked block is top, cactus is top and sides).