How to generate a explorer map that points to a village in code?

[bossmania]

Hi, I'm new to modding and to this forum, and I'm trying to get an item that gives the player an explorer map that points to a village. I was able to do this with a loot table, but I was only able to get the loot table to run when a block is broken.  Is there a way to have a loot table to run in code, or is there a different way to create an explorer map that points to a village?

[Luis_ST]

you could overwrite a vanilla Loot Table or you could create a recipe (needs a CustomRecipe) 

[bossmania]

20 hours ago, Luis_ST said:

you could overwrite a vanilla Loot Table or you could create a recipe (needs a CustomRecipe) 

I was able to get a recipe loot table to generate an explorer map, but the problem with this method is that I want the explorer maps to also point to structures in all three dimensions, and I can't prevent the player from crafting the map in the wrong dimension.

[bossmania]

16 hours ago, diesieben07 said:

You can look at what the loot tables do in code. In this case ExplorationMapFunction. To get loot from a loot table use LootTable#getRandomItems.

Can you elaborate more on that, and give an example of it?

[Draco18s]

1 hour ago, bossmania said:

Can you elaborate more on that, and give an example of it?

I wonder how Blocks (being harvested) calls loot to be dropped. It's gotta call some code somewhere...

[bossmania]

11 hours ago, Draco18s said:

I wonder how Blocks (being harvested) calls loot to be dropped. It's gotta call some code somewhere...

So I tried to look for how Blocks call the loot table, but I was not able to find it. Can you provide how it calls the loot table?

[Draco18s]

Knowing for a fact that it exists, and that it calls ForgeHooks.modifyLoot(...), I'm going to tell you to look harder.

[bossmania]

Ok, so after doing some digging into the Block class, I have found out that it uses this function to run a loot table.

public static List<ItemStack> getDrops(BlockState state, ServerWorld worldIn, BlockPos pos, @Nullable TileEntity tileEntityIn, @Nullable Entity entityIn, ItemStack stack) {
	      LootContext.Builder lootcontext$builder = (new LootContext.Builder(worldIn)).withRandom(worldIn.rand).withParameter(LootParameters.field_237457_g_, Vector3d.copyCentered(pos)).withParameter(LootParameters.TOOL, stack).withNullableParameter(LootParameters.THIS_ENTITY, entityIn).withNullableParameter(LootParameters.BLOCK_ENTITY, tileEntityIn);
	      return state.getDrops(lootcontext$builder);
	}

 

But, how do I get a ServerWorld to pass into the function? I have tried passing "(ServerWorld)World", like how the Block class did it, but it crashes the game. This is the error message.

The game crashed whilst unexpected error
Error: java.lang.ClassCastException: net.minecraft.client.world.ClientWorld cannot be cast to net.minecraft.world.server.ServerWorld
Exit Code: -1

[Luis_ST]

you need to check if the World is an instance of ServerWorld first the you can cast the World like vanilla

[bossmania]

18 hours ago, Luis_ST said:

you need to check if the World is an instance of ServerWorld first the you can cast the World like vanilla

How do I check it? And if it's not an instance of ServerWorld, then how do I get the ServerWorld?

[Draco18s]

If you're not on the server, do nothing. The client has no say here.

[bossmania]

18 hours ago, Draco18s said:

If you're not on the server, do nothing. The client has no say here.

So how do I access the server, and send the ServerWorld to the client?

[Draco18s]

Through the magic of network packets.

That said, I don't see why you'd need it here.

Edited November 12, 2021 by Draco18s

[bossmania]

2 hours ago, Draco18s said:

Through the magic of network packets.

That said, I don't see why you'd need it here.

So then, how else do I get a loot table to run in the code?

[Draco18s]

11 hours ago, bossmania said:

So then, how else do I get a loot table to run in the code?

My point was, you don't make random items on the client, you only do it on the server. If you are not on the server, do nothing, if you ARE on the server, do what D7 said.