make an itemEntity invulnerable

[magic_man]

i'm trying to make my own custom recipes using lightning, but the output item gets deleted because of the lightning

how do i make that item invulnerable to the lightning?

Edited July 31, 2022 by magic_man

[warjort]

Aren't you already listening to the EntityStruckByLightining event?

You need some way to differentiate the item entities you spawned from the normal ones.

One simple way might be to look at the ItemEntity's age to see if it is zero, i.e. it was just created.

[magic_man]

is it also possible to make it invulnerable for only a certain time?

for example 1 second after it is spawned in?

[magic_man]

is that done the same way as just doing it permanently or is that a whole different story

 

also in case the problem is in my code here is the code:

lightning_recipes:

@Mod.EventBusSubscriber(Dist.CLIENT)
public class lightning_recipes {
    
    @SubscribeEvent
    public static void onLightningHitItem(EntityStruckByLightningEvent event) {
        Entity entity = event.getEntity();
                if (entity instanceof ItemEntity itemEntity) {
                    ItemStack itemStack = itemEntity.getItem();
                    if (itemStack.getItem() == Items.IRON_INGOT) {
                        System.out.println("# iron ingot is struck by lightning");
                        entity.remove(Entity.RemovalReason.KILLED);
                        entity.spawnAtLocation(itemInit.ELECTRIFIED_IRON_INGOT.get());
                    }
                }
        }
        
    }

serverevent:

@Mod.EventBusSubscriber(Dist.DEDICATED_SERVER)
public class serverEvent {

	
	@SubscribeEvent
	public static void onservertick(ServerTickEvent event) { } 
}

 

Edited July 31, 2022 by magic_man

[warjort]

Are you really trying to handle this on the client?

The event is only fired on the logical server from what I can see. See LightningBolt.tick()

You should remove the Dist.CLIENT.

Edited July 31, 2022 by warjort

[magic_man]

removing the dist.client changes nothing

the item that it has to transform into is there for a split second and then is gone

[warjort]

Quote

removing the dist.client changes nothing

Not for this issue, yes. But it does mean your mod won't stop working on a dedicated server. 🙂

[magic_man]

managed to do it like this:

    @SubscribeEvent
    public static void onEntityKilled(EntityLeaveWorldEvent event) {
        Entity entity = event.getEntity();
        if (entity instanceof ItemEntity itemEntity) {
            ItemStack itemStack = itemEntity.getItem();
            if (itemStack.getItem() == itemInit.ELECTRIFIED_IRON_INGOT.get()) {
                System.out.println("# not allowed");
                entity.spawnAtLocation(itemInit.ELECTRIFIED_IRON_INGOT.get());
    }
}
    }
}

(cancelling the event didn't work)
 

but i have a problem that if the iron stack on eachother instead of doing every single one individually it only gives one

example: you drop 16 iron ingots, a lightning strike hits it, output is still 1

[magic_man]

i tried it but didn't really get it to work and eventually thought like: what if i just say no to it deleting it?

[magic_man]

this worked, but this isn't the part that should cause the issue

    @SubscribeEvent
    public static void onEntityKilled(EntityLeaveWorldEvent event) {
        Entity entity = event.getEntity();
        if (entity instanceof ItemEntity itemEntity) {
            ItemStack itemStack = itemEntity.getItem();
            if (itemStack.getItem() == itemInit.ELECTRIFIED_IRON_INGOT.get()) {
                System.out.println("# not allowed");
                entity.spawnAtLocation(itemInit.ELECTRIFIED_IRON_INGOT.get());
    }
}
    }
}

it's this that should cause it:
 

   @SubscribeEvent
    public static void onLightningHitItem(EntityStruckByLightningEvent event) {
    	Entity entity = event.getEntity();
    			if (entity instanceof ItemEntity itemEntity) {
    			    ItemStack itemStack = itemEntity.getItem();
    			    if (itemStack.getItem() == Items.IRON_INGOT) {
    			    	System.out.println("# iron ingot is struck by lightning");
    			    	entity.remove(Entity.RemovalReason.KILLED);
    		            entity.spawnAtLocation(itemInit.ELECTRIFIED_IRON_INGOT.get());
    			    }
    			}
        }
		
	}

 

[warjort]

There is another way you can do this.

A lightning bolt does 5 points of damage and ItemEntitys are created with health = 5

If you use an Access Transformer to make the health field public, you can modify your spawned ItemEntity so it has enough health to survive a lightning strike.

The side effect might be the ItemEntity also survives other damage its not supposed to, e.g. an explosion.

[warjort]

Do you really think creating a new EntityType and writing all the code to replace spawnAtLocation() and maintain in when Mojang changes it future

is simpler than modifying one value? 🙂

[warjort]

By the way, nobody answered the other question.

Quote

but i have a problem that if the iron stack on eachother instead of doing every single one individually it only gives one

example: you drop 16 iron ingots, a lightning strike hits it, output is still 1

You should use something like (untested code):

Quote

entity.spawnAtLocation(new ItemStack(itemInit.ELECTRIFIED_IRON_INGOT.get(), itemStack.getCount()));

 

[warjort]

Quote

There is also another approach, if the spawned item is always added by the mod itself.

Item.canBeHurtBy()

Yes I saw that, but I got the impression the original poster was writing something more generic from the original question. 🙂