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How to locate generated structures (update 1.19.4)


jstastny

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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.

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

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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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?

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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()

 

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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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!

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