Finding a block within loaded chunks

[ajGeneric]

The mod I am coding is a client-side only mod. Additionally, the block is not a naturally spawned block.

I need to loop through all the currently loaded chunks, and get all blocks of the type i am looking for (barrier block).

In the end, I should have a list with the barrier blocks in it.

public static List<BlockPos> barrierBlocks = new ArrayList<>();

Does anyone know how to do this?

there is nothing in Minecraft.getMinecraft().world for getting all loaded chunks.

 

[ajGeneric]

the lag is fine, as this action will only be performed upon running a command, if it freezes the game for like 5- 10 seconds thats completely fine. 

 

 

I am trying to get the location of all barrier blocks, then ill tp each player to a random barrier block

[ajGeneric]

ho boi time to learn reflection.

what property of ClientChunkProvider do i need to access? 

Thanks for the help.

[ajGeneric]

38 minutes ago, diesieben07 said:

Should be pretty obvious if you look at what its getChunk method does.

 

according to the source code, i should be looking to access the chunkMapping

thank you once again

Edited February 24, 2021 by ajGeneric

[Draco18s]

5 hours ago, diesieben07 said:

This is a bad idea. There are a lot of blocks to look through and this will lag the game horribly.

Having actually benchmarked this, not really.

 

Scanning a whole chunk from 0 to 64 takes 600,000 nanos provided you're doing virtually nothing else (e.g. don't find a matching block). Adding a position to a list is going to be pretty small as well (my benchmarking involved more complicated stuff, which included setting block states, and even for a bunch of matching blocks I never exceeded 1,200,000 nanos for a single chunk). For a full 11x11 chunk area around the player and the full chunk height you're looking at 290ms +/- 15%.

 

It's still not a great idea, but the actual time on checking blocks is tiny.