So i am making a mod to make building in survival easier and i am working on an item that changes the biome of the block right clicked.  I have searched on google and on the forums but i havent found a way to change the biome after world generation.  As far as I know minecraft doesnt normally do this so i dont know if it's even possible.  Any suggestions would be nice.

Biomes are stored in the

Chunk#blockBiomeArray

field. Use

World#getChunkFromBlockCoords

to get the

Chunk

at the specified position, then use

Chunk#getBiomeArray

to get the biome array.

 

This array stores the ID of the

Biome

at each x/z position within the chunk, using

(z & 15) << 4 | (x & 15)

as the index. Use

Biome#getIdForBiome

to get the ID of a

Biome

.

It crashes when i use this code im sure its because of how im setting the biome but im  not sure how i should do it.

 

worldIn.getChunkFromBlockCoords(pos).getBiomeArray()[index] = (byte) Biome.getIdForBiome(new BiomeSnow(true, null));

It crashes

 

Crashlog?

Im an idiot and forgot to post it so here it is http://pastebin.com/Xueb4Fjq

Nevermind i figured it out i had to use

worldIn.getChunkFromBlockCoords(pos).getBiomeArray()[index] = (byte) Biome.getIdForBiome(Biomes.COLD_TAIGA);

instead.

Yeah, no shit. Creating a new biome instance is not the same as referencing an existing instance.