Custom seed isn't applied to Fantasy world

[HyperPigeon]

I've been trying to create a copy of the Overworld dimension using Fantasy.

       Long seed = gameSpace.getServer().getOverworld().getRandom().nextLong();        
       ChunkGenerator overworldGen = config.overworld().chunkGenerator();

        RuntimeWorldConfig worldConfig = new RuntimeWorldConfig()
                .setDimensionType(config.overworld().dimensionTypeEntry())
                .setDifficulty(Difficulty.HARD)
                .setGameRule(GameRules.DO_MOB_SPAWNING,true)
                .setGameRule(GameRules.DO_DAYLIGHT_CYCLE, true)
                .setGenerator(overworldGen)
                .setSeed(seed);

However, the world created by the above RuntimeWorldConfig is always the same regardless of the seed value. My guess is that the game is using the seed of the main world instead of the set seed.

[Patbox]

Most likely it's caused by generator having own seed

[HyperPigeon]

That's a bit irritating, does that mean I have to make my own generator?

[Patbox]

Most likely

[haykam821]

The main issue is that the runtime world must return the custom seed through World#getSeed, including within the ServerWorld constructor. The solution is to override World#getSeed in a way that the seed is initialized before it is called.

[sakurawald]

The main issue is that the runtime world must return the custom seed through World#getSeed, including within the ServerWorld constructor. The solution is to override World#getSeed in a way that the seed is initialized before it is called.

Spent hours debugging and finally found this solution.