What's new on EarthToMC v2.1 - Underilla caves & ores, merge of multiple .world file, major changes to rivers processing, tons of bugfixes - 2026/06/25

Hi everyone, a new version of EarthToMC has just been released! Once again, lots of new features and bugfixes thanks to your suggestions and reports :)

The main new features introduced are: generation of vanilla caves, ores and structures with Underilla directly in EarthToMC (massive thanks to @Hydrolien for maintaining this great plugin!), the ability to merge multiple WorldPainter tiles into a single large .world file for manual editing, major improvements to the handling of rivers and lakes (with the option to include only the main ones), and support for Minecraft Java up to version 26.2

You can find the complete list of all changes in the changelog --> https://www.earthtomc.com/app/CHANGELOG.txt

Download post:

EarthToMC v2.1-beta [2026/06/25] - Download and Installation tutorial | Patreon

Generation of vanilla caves, ores and structures with Underilla

Until now, EarthToMC supported the ability to add caves and ores using WorldPainter layers, but it was not possible to use caves and ores leveraging Minecraft's Vanilla generation. In EarthToMC v2.1, this problem is finally solved thanks to the use of Underilla, a plugin for Paper that allows you to generate custom underground in maps generated with WorldPainter

A special thanks to @Hydrolien, developer of Underilla and maintainer of the plugin for the most recent versions of Minecraft! If you want to support Underilla, consider making a donation to the developer here https://tipeee.com/hydrolienf/

In order to work, Underilla needs an instance of a Paper server running locally on your PC. EarthToMC automates this process, taking care of setting up the Paper instance and launching Underilla together with Chunky. This way, at the end of the process, the user will have a Minecraft map completely populated with vanilla caves and ores, as well as Minecraft structures, without any work to do!

This generation process is rather slow due to the nature of how Minecraft's Vanilla generation works, and it is a process that can only take place after the actual generation of the WorldPainter world. So it's important to point out that using Underilla involves an increase in map generation times, which can turn out to be 3 to 5 times slower than without using Underilla. On the other hand, however, there is no better solution to achieve this goal on recent versions of Minecraft

Underilla is fully customizable to your own needs, letting you enable/disable individual structures, or caves or ores individually. You can customize the experience through a dedicated configuration panel

Ability to merge multiple WorldPainter tiles into a single .world file

EarthToMC works by splitting the map into tiles, so as not to overload RAM and CPU during the generation process, and to be able to run even on computers with only 8GB of RAM
The downside of this aspect is that, for those who manually edit maps in WorldPainter, large maps can have hundreds of tiles, and this makes manual editing of the maps unfeasible

In EarthToMC v2.1, a dedicated feature has been added that, once the individual .world files of each tile have been generated, merges these files in order to provide the user with merged tiles that are as large as possible (it's not possible to create .world files larger than 46k x 46k, so for a larger map several large tiles will be generated)

The user can then manually make the changes they need to perform on the merged .world file: in the end, after manually editing the project in WorldPainter, EarthToMC will split the .world file back into small tiles, so as to make it possible to export the map without Out of RAM problems

Improvements to the handling of rivers and lakes

Due to the slowness in processing OpenStreetMap water bodies, the previous version of EarthToMC (v2.0) introduced the Natural Earth dataset in order to speed up the generation of low-resolution maps. However, the quality of the Natural Earth dataset is not comparable to that of OpenStreetMap, especially because long rivers are represented as polygons in OpenStreetMap, while Natural Earth treats rivers as lines, not characterizing their width (which was therefore the same for all rivers)

In EarthToMC v2.1, OpenStreetMap is once again used as the main dataset for water bodies, including for low-resolution maps. A new processing technique makes this step much faster than in the past (the data is pre-processed and hosted on earthtomc.com, so as to avoid thousands of computations on your own PC)

In addition, rivers are now divided into three categories: major (length > 400km), medium (length between 400 and 100 km), small (length < 100km). The user can choose which types of rivers to include in their map. It's also possible to widen the rivers, setting one width for major rivers and another width for the other river types

Tiny isolated ponds (smaller than 4 km²) are now excluded from low resolution maps (> 30m) in order to avoid "random puddles of water"

This is an example of a low resolution map (scale 1:300) with enlarged major rivers (15 blocks, very extreme) and major rivers only included in the map

For comparison, this is the same map with all types of rivers activated, even smaller ones (< 100km length).

Tons of bugfixes

EarthToMC 2.0 had issues with the rendering of riverbeds, which were not smooth from the edges to the center of the river due to an issue with the WorldPainter layer

Issues with bathymetry, raising the level of the oceans by 1 block, or not flooding certain shallow ocean regions, should have been fixed in EarthToMC 2.1

A lot of changes have been done on the Biome classification algorithm, which now uses 30-40% less ram than before, fixing a lot of Critical Error 20 happening on EarthToMC 2.0

A bug where some islands inside rivers and lakes could be submerged by the water and disappear from the map has been solved

You can read all the other minor changes on the full changelog

FULL CHANGELOG --> https://earthtomc.com/app/CHANGELOG.txt

Download post:

EarthToMC v2.1-beta [2026/06/25] - Download and Installation tutorial | Patreon