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jacobsjo.eu
jacobsjo
@jacobsjo.eu
100 followers 94 following 23 posts
Computer Scientist, Minecraft datapack toolsmith, Photographer

jacobsjo.eu
https://github.com/jacobsjo/
modrinth.com/user/jacobsjo
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jacobsjo.eu
Today is the 5th anniversary of #Minecraft data pack #worldgen! Snapshot 20w28a added the ability to define custom biomes, structures, etc. through data packs. It's hard to overstate the impact this change had on modded worldgen. Very proud of what our community has made with it so far! #mcdev
A screenshot of a Minecraft world that looks like a cake. It consists of 4 layers. Each layer has frosting on the top and brown cake below. There are a lot of candles on the cake. In the foreground, there is a pink "river". The sky is pink with the normal white Minecraft clouds.
July 8, 2025 at 10:38 AM
jacobsjo.eu
Turns out the firefly particles make very good nether ambient particles too. In the Lavaflow 1.21.5 update, I've added them to the ghost forest.

#mcdev #minecraft
April 19, 2025 at 6:50 PM
jacobsjo.eu
There is literally an image showing Tinkers' Construct and numerous other mods mentioned in the same section 🤷‍♂️
Screenshot of section "Mod content" on https://en.wikipedia.org/wiki/Minecraft_modding until the start of the subsection "WorldEdit"
February 16, 2025 at 1:31 AM
jacobsjo.eu
Trying to figure out ancient debris distribution in Lavaflow, I wished to have a visual marker for each placement position. So today I've implemented a debug renderer for feature locations into my Worldgen Devtools mod.

Just released that in version 1.3.0 for mc 1.21.3 and .4.
Open with F3+F
#mcdev
A Minecraft screenshot from inside a old growth pine taiga, with a river in the background. A number of markers of different colors are placed on screen, consisting of a cube and text above. The closest markers reads "minecraft:patch_brown_mushroom", "minecraft:patch_taiga_grass" (2 markers), and "minecraft:forest_rock".
December 23, 2024 at 2:19 AM
jacobsjo.eu
Finally published a first Alpha of "Lavaflow", a #Minecraft worldgen #datapack / mod that completely overhauls the Nether. It includes lava rivers on 2 heights with lavafalls between them, proper valleys, oceans and more.

Check it out on modrinth: modrinth.com/datapack/lav...

#mcdev
Looking down at a nether fortress over a large lava ocean. In the foreground the end of a lava river is seen between crimson forest. The river leads towards what appears to be a lavafall, though that is only visible from the back. A lava river flowing through a soul sand valley. The valley is more flat the the typical nether. A large ruined portal is placed on the right shore. Behind the portal is a mysterious forest formed by trees with bone stems, white leaves, and glowstone. A elevated view of a lava river flowing though a valley with basalt deltas and soul sand valley biomes. Above the valley is a series of floating terrain stips that can be used as walkways. A tower in the foreground provides a connection between the valley floor and these walkways. In the background a bridge of a fortress can be seen reaching over the river.
December 16, 2024 at 2:16 PM
jacobsjo.eu
I've just released an update to my #minecraft datapack map:
- You can now directly select datapacks from @modrinth.com.
- Added URL parameters for the settings and datapacks. For example, you can directly open a Terralith map using: map.jacobsjo.eu?datapacks=mo...

#mcdev #DatapackShowcase
A menu of the datapack map. The menu was opened by clicking a "plus" button at the top. The menu consists of the following entries: "Open Pack or Mod", "Open Folder", "Open from Modrinth", a subheader: "Built-in Datapacks" with entry "Winter Drop", a subheader: "Recently used" with entry "Terralith". The rest of the menu is cut off. A modal menu titled "Open from Modrinth". A x button is on the top right. Below the title is a search bar and 2 settings "include mods" and "ignore minecraft version". Below that is a list of datapacks with an image, title, description.
November 23, 2024 at 11:58 PM
jacobsjo.eu
Have you ever wanted to see a map of how a specific #minecraft seed generates? But you are playing with datapacks that modify worldgen? I've got an online solution for you:

map.jacobsjo.eu

(Works with some mods too, but not with all)

#mcdev #DatapackShowcase
A map showing Minecraft biomes by color. The map shows multiple continents surrounded by water. The water-color also differs based on the specific ocean biome. Shading indicates terrain relief. On one continent a symbol indicates the spawn point.
November 17, 2024 at 1:33 PM