How to locate generated structures (update 1.19.4)

[jstastny]

Hello,

I'm working on updating certain old mod, this time from 1.12.2 to 1.19.4, and I again stumbled upon the same issue. In this mod, I still need the function that gives me coordinates of the nearest generated structure. I again found a method that can do this, but unfortunately, this time the method requires an instance of the class ServerLevel (probably a new name for ServerWorld). In order to get this instance, I again tried reverse-engineering several mods for 1.19.4 and parts of Forge code, but just as in case of 1.15.2, none of the methods I tried worked. Does anyone know how to solve this? Thanks for any response.

[ChampionAsh5357]

Well, the method in question for the logic would be via LocateCommand#locateStructure which delegates to ChunkGenerator#findNearestMapStructure. You would of course need the ServerLevel as structures can only exist in the world. So, what context are you executing this in such that you don't have the level?

[jstastny]

On 3/26/2023 at 5:13 PM, ChampionAsh5357 said:

Well, the method in question for the logic would be via LocateCommand#locateStructure which delegates to ChunkGenerator#findNearestMapStructure. You would of course need the ServerLevel as structures can only exist in the world. So, what context are you executing this in such that you don't have the level?

I have an item that when right-clicked should locate the nearest structure (important is the type of the structure and its coordinates), take the data and if the structure is close enough to the player, create a book that contains the data. So, if I understood the differences between 1.19 and older versions, probably method use(). This method should have arguments Player and World, but I wasn't able to get instance of ServerLevel from neither of those.

Edited March 27, 2023 by jstastny

[warjort]

Look at EnderEyeItem.use() which locates the nearest stronghold (StructureTags.EYE_OF_ENDER_LOCATED)

[jstastny]

4 hours ago, warjort said:

Look at EnderEyeItem.use() which locates the nearest stronghold (StructureTags.EYE_OF_ENDER_LOCATED)

I tried what you suggested and used the method they used with the ender eye and after a bit of tuning, it worked. Honestly, I already tried using exactly this method before, but the game kept crashing because of class cast exception, so I gave up on that. But still, thank you so much!

Regarding the same mod, I have one more question. Is there any way (under the same conditions) to find out boundaries of structures or whether the player is in them?

[warjort]

The only place in vanilla I know about that checks structure bounds is in NaturalSpawner.isInNetherFortressBounds() for blaze/wither skeleton spawning.

That uses the StructureManager which can be obtained from ServerLever.structureManager()

 

[jstastny]

4 hours ago, warjort said:

The only place in vanilla I know about that checks structure bounds is in NaturalSpawner.isInNetherFortressBounds() for blaze/wither skeleton spawning.

That uses the StructureManager which can be obtained from ServerLever.structureManager()

 

I tried searching the Forge code, and while I wasn't able to find the code for nether fortresses or spawners, I found a similar code used for spawning cats in swamp huts. I used this code and it worked like charm! Thank you!