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What is OTG?

Open Terrain Generator is an advanced, fully customizable world generation utility. Through its various configuration files it gives the user control over almost every aspect of Minecraft's world generation, allowing you to generate anything from floating islands to cave worlds with no knowledge of Java required. OTG is just an engine, to make use of its functions you must either install a World Preset (see Installing Worlds) or make your own custom World Preset (see Configuration below or in Navigation bar at the top). OTG supports both Spigot (servers) and Forge (servers and single-player).

Main features

  • Control horizontal and vertical noise, terrain height and volatility
  • Create new biomes and control the size of biomes, islands and continents
  • Import custom trees and other objects (BO2 and BO3)
  • Control over mob spawning rules and climate settings per biome
  • Generate large custom structures with custom mobs and loot
  • Options for vanilla structures like mineshafts, strongholds and villages
  • Full control of all blocks placed during world generation: ores, plants, dungeons, ponds and many more
  • Customizable options for caves & canyons
  • Visual settings like custom foliage, water and sky colors (OTG client required)
  • Generating biome maps from images
  • Forge Multi-dimension support (create your own dimension!)


Installing OTG

Installing ready made custom worlds

Config files overview

Custom trees, objects and structures

Tools and resources


Getting started creating your own custom world:

  • What can OTG do? (Overall description of the different things you can do with OTG)
  • Set up & understanding the basics (installation, folder structure, creating a default preset to edit)
  • Your first custom biome (walkthrough of deciding global settings & creating a simple custom biome including finishing touches like mob spawning, temperature)
  • Ores, plants and other resources (deep dive on the resource queue)    
  • Adding your first custom object (using /otg export)
  • Tips for making terrain more interesting and varied (fracture settings, volatility settings, custom height control, isle biomes)
  • Dos and Don'ts for worldgen performance
  • Creating a world from an image

OTG worlds as dimensions:

  • Overview (walkthrough of the different dimension features)
  • Adding an OTG world as a dimension (using the o menu, worldconfig settings and/or modpack config)
  • Getting to a dimension (portals, dim up / down)
  • Gamerules and other settings    

Custom Object and structures:

  • Making a bo3 customstructure
  • Making a bo4 customstructure

Mod compatibility:

  • Explanation of the settings that help with mod compatibility
  • OTGs compatibility limitations

Publishing a preset:

  • Packing your preset in a .jar file for distribution as a mod

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