Biome Height Tweaker Mod is a small mod for adjusting the height and variance of Biomes in the game.
Note: You must configure this mod. If you don’t configure it, all aspects of world generation will remain the default, thus this mod will not change anything.
Configuration can be done in two places:
A) The game gui: Click on the mods button on the title screen, choose Biome Height Tweaker, then press configure. Here you will have the options to enable/disable villages in the ice plains, enable/disable the alternative over world cave generation. And if you click on any of the listed biome, the ability changes the generation height and variance of those biomes.
B) The Configuration file: While the in game gui is good for many types of tweaks to copy to other users, and some more programmatic changes may be useful to edit the config directly. When the mod firstly runs a configuration file with the system, defaults will be generated in the config folder (biomeheighttweaker.cfg). After it is generated, you can edit it with a text editor to set the configuration of the mod. This is also the file to back up if you want to backup the settings from the in game gui above.
Regarding the ranges of values: Height refers to the average height (-2.0 at bedrock, 0.0 at normal sea level, and 4.0 at build limit). Variation is how far from that point the terrain ought to diverge (size of mountains and hills) and is on the same scale. Note: Bedrock will always generate with the local height is <0, you just see the bedrock without any other blocks. Any area where height is >4 will cause the world to plateau at build limit.
Spruce Villages in the Ice Plains:
Biome Height Tweaker Mod has an option to enable Spruce villages in the Ice Plains biomes. By default, this is disabled, but by changing the config, these will generate in your world.
Alternative Cave Gen: (added in v1.9.4-0.4)
Biome Height Tweaker Mod has an alternative cave generation system. This makes caves more numerous and lager particularly in the size of the underground pockets that will generate in the overworld. Note: This will only replace cave gen for dimensions using the default (and “customized”) world types, or modded world types that use the default generation as its chunk provider. As such expect, most modded dimensions/world types are to use standard cave generation.
* Half Amplified: http://minecraft.curseforge.com/projects/half-amplified-world-gen