A simple server sided mod that adds a command to allow plan builds with friends from within a server without having to switch to a singleplayer world.

Works by creating a plan dimension for each player, of superflat and regular world type, each of which are on a different seed stopping players from using the mod to cheat. Completely server sided so works on vanilla servers where the players aren't required to use mods. Also lets players invite other players to there plan dimension to plan any possible build with them. The state of the player including position, health, hunger, inventory, armor, and any other player data gets saved and left behind for the survival world and seperate data is saved for the plan world. Also has various mod support and guardrails, some to mention include curios, ftb quests, create, etc. Also adds quality of life commands like /plan fill, /plan clear, /plan gamemode, /plan locate, etc. that the player can use without requiring op permissions. Any builds from the plan dimension save when the player leaves it or rejoins it. Also stops the player's stats from changing while in their plan dimension, and doesn't sync ender chests from the plan dimension to the main world.

Commands:

•  /plan create {superflat/regular} - teleports the player to their plan dimension of the set type.
• /plan join {superflat/regular} - same as previous, teleports player to the selected type of world.
• /plan invite {username} - invites the selected player to their plan dimension to work with them.
• /plan accept - accepts the last sent invite to the player, the player can also simply click the accept button in chat.
  
  Commands for inside your plan world:
  
  
• /plan fill {location 1} {location two 2} {block} {optional: fill type} {optional: related block} - works the same as the /fill command but confined to the plan dimension, fills the blocks between the set coordinates.
• /plan clear - clears the inventory or the person using it, doesn't work on other players.
• /plan gamemode {gamemode} - sets the gamemode of the player using the command.
• /plan locate {biome/poi/structure} {thing to locate} - finds the requested structure and gives the player the coordinates to it.

Plan

Private creative build worlds for every player — right on your survival server.

Plan gives each player their own private, creative "plan" dimensions to design and build in, then step back into survival exactly as they left it. Builds happen in isolated projects you can keep, name, share with friends, and throw away — without ever touching your main world.

Server-side only, for NeoForge. Players connect with a normal vanilla client; nothing to install client-side. (But many mods are supported)

How it works

• A project is a private build area — its own region with its own nether and end (reached by building portals), generated on its own scrambled seed so it never reveals your real world.
• Entering a project drops you into creative mode with a fresh inventory that belongs to that project. Leaving puts back your real gamemode, inventory (every slot, including modded ones), ender chest, position and momentum — exactly as before.
• Each project keeps its own inventory per player, so switching projects never mixes your stuff.
• Projects can be shared: invite a friend and they can join any time.

Everything you do inside a project stays inside it. While in a plan dimension you can't earn advancements, your statistics don't change, FTB Quests can't complete, and the world border is always full-size so you're never stuck out of bounds.

Getting started

1. /plan create regular — makes your main "regular" project and drops you into it in creative.
2. Build. Use /plan fill, /plan time, /plan weather, etc. as you like.
3. /plan leave — back to survival, right where you were, with your real inventory.
4. /plan join regular — hop back into your build any time.

Make more with /plan create regular My Castle (or superflat for a flat canvas). Invite a friend with /plan invite <player> and they'll get a clickable message to join.

Commands

Projects

• /plan create <superflat|regular> [name] — Create a new project and enter it. Name is optional (defaults to your main, then Blueprint 1, Blueprint 2, …).
• /plan join <superflat|regular> — Enter your main project of that type.
• /plan join <name> — Enter one of your own projects by name. Others' shared projects show as Owner's Name (all names tab-complete).
• /plan leave — Leave the project and restore your real state.
• /plan list — List every project you can access.
• /plan relocate [name] — Move a project to a fresh area (the current one if no name is given).
• /plan delete <name> — Delete a project you own and revert its plot.

Sharing

• /plan invite <player> — Give a player permanent access to your current project.
• /plan revoke <player> — Remove a player's access (owner only).

Building (only inside a plan dimension, no operator status needed)

• /plan fill <from> <to> <block> [mode] — Fill within your plot. Coordinates and blocks tab-complete; modes are replace/destroy/keep/hollow/outline.
• /plan locate structure|biome|poi <id> — Locate within your plan dimension (tab-completes the list).
• /plan clear — Empty your own inventory.
• /plan gamemode <survival|creative|adventure|spectator> — Change your own gamemode.
• /plan time <day|noon|night|midnight|ticks> — Set the time in your plan dimension.
• /plan weather <clear|rain|thunder> — Set the weather in your plan dimension.