CSG WorldBorder

The vanilla world border, but any shape you want, in full 3D.

Domes, spheres, floating islands, ring tracks, towers you can only climb inside, battle royale zones that shrink as a sphere instead of a square. CSG WorldBorder doesn't add a second border next to vanilla's. It turns the vanilla border itself into a 3D volume, so everything in Minecraft that already respects the border keeps doing so, just in your shape.

What it does

Build the border out of boxes, spheres, cylinders, cones and tori. Move, rotate, scale and stack them as layers that add, subtract or intersect:

/worldborder shape add arena sphere 40
/worldborder shape add pit cylinder 6 20 at ~ ~-10 ~ mode subtract
/worldborder shape resize arena to 15 over 600

That's a dome arena with a pit cut into it, shrinking over ten minutes.

• Real 3D walls. Floors and ceilings are solid too: players, mobs and vehicles can't pass, in survival or creative.
• Native behavior. Block placing and breaking, mob spawning, portals, spawn points, damage and the red warning all follow your shape.
• Block-snapped, like vanilla: every block is fully inside or fully outside.
• Animated. Any change can play out smoothly over time, and keeps going through restarts.
• No shapes needed for a round world. The classic border can be a circle, hexagon, octagon, diamond, triangle or star, still sized by vanilla /worldborder set.

Built for PvP and events

• Protected areas. Make an area's walls unbreakable, or protect the whole area like adventure mode. Blocks players place during a match stay breakable, so cover never turns into an indestructible wall.
• Explosion-proof. Protected blocks survive TNT and modded explosives, including weapon mods.
• Projectiles stop at the border. Bullets, rockets and grenades, from vanilla or mods, can't leave the zone.
• Datapack-friendly. Every command runs silently from functions, so timed battle royale phases are a few lines of schedule.

Easy to use

• Clear commands. One verb per action: add, move, resize, rotate, scale, protect…
• A full in-game editor. Press 0, with a live orange preview of every edit before you apply it.
• Per-world settings. Saved inside the world folder, so a map carries its border with it.

Works with

• Xaero's World Map + Xaero World Border: exact shape outlines on the map
• Canary: full support
• Air Tactical Arsenal: map shading follows your shapes
• Other mods that read the border see the rectangle around your shapes.

Full guide

Every command, recipe, setting and detail lives on GitHub:

• README: features, how it works, protection, battle royale datapack example
• COMMANDS.md: the complete command reference

Requires: Minecraft 1.20.1 · Forge 47+ · installed on both server and clients Modpacks: welcome, as long as the jar is unmodified and the mod is credited. See the license.