My world generator is only called in ocean biome chunks (using scala).

 

Code that prints the biome (worldGen.scala):

 

override def generate(random: Random, chunkX: Int, chunkZ: Int, world: World, chunkGenerator: IChunkGenerator, chunkProvider: IChunkProvider): Unit = {
    println(world.getBiomeProvider.getBiomeGenerator(new BlockPos(chunkX, 0, chunkZ)))
}

 

Registration code (in common proxy init method):

 

GameRegistry.registerWorldGenerator(new WorldGen, 10)

 

When generating a new world or travelling over un-generated chunks (that aren't ocean biomes) it prints out BiomeOcean@xxxxx

I'd also recommend using

World#getBiome

instead of

BiomeProvider#getBiome(BlockPos, Biome)

. This will query the

Chunk

's biomes if it's loaded or fall back to the

BiomeProvider

if it isn't.

Thanks guys, this seems quite obvious now!