World & Terrain

Build Height

A world's maximum build height can be set using the maxbuildheight element. Once a player tries to build past the set maximum build height, they will be prompted with a message stating that they may not build past the playing field.

<maxbuildheight>64</maxbuildheight>

Terrain

A world's terrain generator can be modified to use a specific seed, world and/or whether the vanilla chunk generator is used. By default, a new random seed is generated for each match, unless one is specified in the seed attribute.

When using the vanilla generator, the default Minecraft terrain generator will be used instead of generating null chunks. The specific world generation rules such as flat worlds, etc., can be changed by editing the world's level.dat file with a NBT editor. The RandomSeed value in the level data file is not used.

Any chunks not in the world's region/ folder will be generated according to the Minecraft chunk generation rules. This means that only the terrain that you have modified needs to be saved with the world.

Element	Description
<terrain />	A node defining properties for this world's generator.

Terrain Attributes

Attribute	Description	Value	Default
vanilla	Specify if this world is uses the vanilla or null chunk generator.	true/false	false
seed	The world's seed that determines how the world is generated.	String
environment	The world's dimension type. Note: Worlds with the end environment are not supported in Minecraft 1.8.	normal nether the end	normal
pre-match-physics	N/AAllow physics events, such as water flowing, before the match starts.	true/false	false

<!-- Make a vanilla world with the seed 'qwerty' -->
<terrain vanilla="true" seed="qwerty"/>

<!-- Make the world Nether-like. The 'region' folder must be inside a 'DIM-1' folder for this to work. -->
<terrain environment="nether"/>

<!-- Make the world End-like. The 'region' folder must be inside a 'DIM1' (no dash) folder. -->
<terrain environment="the end"/>

Internal Maps

Maps that are entirely indoors or underground can use the internal attribute on the main map element to prevent observers from accidentally teleporting on top of the map with the compass tool. In order for this to work, the exterior of the map must be completely filled in with solid blocks, all the way up to the maximum build height.