Hytale Gravity Flip

Gravity Flip lets you create anti-gravity regions on your Hytale server using a wand — no scripting, no file edits, no server restarts. Want to walk on the ceiling? Place two corners, name the region, and flip the world.

What Does It Do?

Mark a region in game with a wand tool.
Instantly flips gravity inside your box for players, items, and/or mobs, depending on your config.
Everything is persisted to disk, no fiddling with configs.
Toggle regions, delete, teleport, etc., all via /gravityflip commands.
Visualize with outlines or particles. Toggle between modes.
Built for builders: no code, minimal ceremony.

Quick Start

Copy hytale-gravity-flip-<version>.jar into your server's mods folder.
Run your server.
Use /gravityflip wand in-game to get the Gravity Flip Wand.
Left-click a block (corner 1), right-click another (corner 2).
Run /gravityflip define <region_name> — done. Gravity now flips inside that box.

Commands

All commands are subcommands of /gravityflip:

Command	What it does
`/gravityflip wand`	Gives you the wand.
`/gravityflip define <name>`	Defines a region from your selection.
`/gravityflip list`	Lists all registered regions and their info.
`/gravityflip delete <name>`	Removes a region.
`/gravityflip toggle <name>`	Enables/disables a region.
`/gravityflip tp <name>`	Teleports you to a region's center.

How The Wand Works

Left-click = set pos1
Right-click = set pos2
Each player gets their own selection — it sticks until changed/logged out.
When both corners are set, run /gravityflip define <name>

Region Fields

Gravity Flip regions are saved as JSON. Each region needs a Name and a Box (AABB). The rest have defaults.

Field	Type	Default	What it means
Name	string	required	The name/id you use in commands.
Box	array	required	`{min: [x,y,z], max: [x,y,z]}`
Enabled	bool	true	If off, region does nothing.
FallDamage	bool	false	Keep vanilla fall damage? (usually off)
GracePeriodMs	int	2500	Smooths the gravity transition (ms).
VerticalForce	float	0.1	How strong the anti-grav is.
AffectPlayers	bool	true	Flip players?
AffectNpcs	bool	true	Flip mobs/NPCs?
AffectItems	bool	true	Flip dropped items?
VisualColor	string	#00FFFF	Outline/particle color.
VisualMode	string	Outline	Outline, Particles, or None.
VisualRefreshMs	int	1000	How often visuals are updated (ms).
VisualOpacity	float	0.5	Outline transparency (0–1)
VisualParticleId	string	Torch_Fire	Particle id for "Particles" mode.
VisualParticleDensity	float	0.3	Particle density along edges.

Visualization

Outline: Wireframe box for editing and debugging.
Particles: Edges emit particles.
None: Go "invisible" for production/live use.

The Region File

Sits at Server/mods/Mythlane_GravityFlip/regions.json. Changing regions via commands saves instantly. If you hand-edit, restart the server. First run always seeds a "demo" region.

Prebuilt Regions (for dev/testing)

Name	Min	Max	Purpose
tutorial_walk_on_ceiling	(10,81,10)	(15,86,15)	Simple walk-on-ceiling, cyan outline
item_fountain	(20,80,10)	(23,100,13)	Items float up, for demos
mob_chamber	(30,81,10)	(40,89,20)	Mobs only, red outline
full_chaos	(-15,81,10)	(0,91,25)	Players, mobs, items — chaos, purple
gentle_lift	(-40,80,-20)	(-20,85,0)	Weak antigrav
strong_launch	(-15,80,-15)	(-10,83,-10)	Launch pad settings
grace_period_demo	(15,81,-20)	(23,87,-12)	Entry anim with grace period
no_grace	(25,81,-20)	(33,87,-12)	Instant flip, for comparison
fall_damage_off	(40,110,0)	(50,120,10)	Fall damage off, high up
disabled_example	(-30,81,0)	(-25,86,5)	Persisted but disabled
showcase_arena	(-80,81,-80)	(-50,96,-50)	30x15x30 gold-outlined box
dense_particles	(50,81,50)	(58,89,58)	Ultra-dense particle effect

Installing

./gradlew shadowJar
cp build/libs/hytale-gravity-flip-*.jar <HytaleServer>/Server/mods/
# Restart your server

On first start, /regions.json is seeded with a demo region. Use the wand/commands to manage regions.

Development

Requires JDK 25, Gradle, Hytale Plugin API (from https://maven.hytale.com/release), and a dev server.
Code lives in src/main/java/com/mythlane/gravityflip/
Unit tests: pure-data logic is covered in src/test/java/

Building

./gradlew shadowJar     # Build the fat jar with gson relocation
./gradlew test          # Run unit tests

For dev fast-deploy, see copyJarToDevServer gradle task.

Extending

New subcommand? Add a class, register in GravityFlipCommand.
New wand interaction? Register in the plugin setup() and hook it in assets.
New region field? Add to the codec; existing JSON will keep defaults.

How It Works

Player/NPC/Item
     |
     v            (checked every tick)
 RegionTickLoop
     |     <----  Regions loaded from regions.json
 GravityApplier + FallDamageGuard
     |
 region effect

Wand:
  Player clicks -> WandSelectionStore -> define region -> registry saves to JSON

Tightly integrated Hytale plugin — lifecycle hooks, asset registration, everything inside the jar.
Tick loop: runs 10x/sec, checks if entities are in zones, flips gravity as needed.
Threading: regions are snapshotted for fast concurrent reads.
Plugin self-seeds demo region so you never boot to an empty world.

Stack

Java 25, modern features (records, sealed types, etc).
Gradle 8 + shadowJar (Gson relocated out of the global space).
Hytale Plugin API core (JavaPlugin, Config, Interaction.CODEC).
JUnit 5 for testing data and codecs.

Credits

Made by Mythlane. Plugin layout/modeling borrowed from our VotePipe and related plugins.

License

License to be decided. Ping contact@mythlane.com for questions.