# PlayerCulling logo

[![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/MinceraftMC/PlayerCulling?style=flat-square)](https://github.com/MinceraftMC/PlayerCulling) [![AGPLv3 License](https://img.shields.io/badge/License-AGPL%20v3-yellow.svg?style=flat-square)](https://opensource.org/license/agpl-v3/) ![Status Alpha](https://img.shields.io/badge/Status-Alpha-red?style=flat-square) [![Discord](https://img.shields.io/discord/1094193723191070793?style=flat-square&label=Discord&link=https%3A%2F%2Fdiscord.gg%2FzC8xjtSPKC)](https://discord.gg/zC8xjtSPKC) ## Description PlayerCulling is an anti-cheat plugin and mod for Minecraft servers. It prevents players from seeing other players through walls using cheats. It utilizes a unique allocationless asynchronous voxel stepping-faced-ray-casting algorithm. ## Features - Asynchronous, multithreaded culling - Allocationsless voxel raycasting algorithm - Advanced scheduler system - Support for nametag visibility, potions, glowing and spectating - 2x2x2-scale voxel occlusion for non-full blocks - Efficient storage of occlusion block data - Nearly instant block updates - Easily enable/disable culling globally/per-player

Scheduler Overview

PlayerCulling uses a custom multi-threaded culling execution system. Using this system, PlayerCulling is able to scale according to server load, and can cull both very few players and very many players, as long as enough CPU is available. The scheduler will dynamically start/stop threads ("containers") based on how many threads are needed. To limit the amount of resources PlayerCulling can use, see the thread limit in the plugin configuration. By default it limits itself to (number of CPU threads / 3). Here are some examples on how the PlayerCulling scheduler works. The following examples were tested on an arch linux desktop environment with an AMD Ryzen 5 3600X CPU:

One Container
One container is able to handle the load of 42 players without many problems.
Two Containers
If the load increases, the scheduler will automatically create a second container and distribute the players to maintain a buffer. In this example, a total of 55 players are together in an area.
Cleanup of Containers
If a container is no longer used because the load decreased, it gets parked first. After its time-to-live (TTL) runs out because the load didn't increase again, it will get cleaned up automatically.
Heavy Load
The scheduling system is theoretically able to scale to an infinite amount of containers. As long as the load increases (and the limit of containers hasn't been reached yet), the scheduler will automatically continue to add more containers. In this example, a total of 112 players are together in an area.
Merging of Containers
If the load of multiple containers is too low, they will be merged together after a few seconds.

Performance Overview

Using this view you can keep track of PlayerCulling's performance. The first bossbar shows info about the container with the highest load and general container scheduling statistics: - The count of **R**unning containers - The count of **P**arked containers - The count of total container **T**hreads - The count of total **R**aysteps per cull tick The second bossbar shows the load of the occlusion world cache, the working threads, amount of **C**ompleted tasks, amount of **S**tored chunks and the chunk cache size in bytes. The third bossbar shows info about culled players. The maximum amount of culled players can be calculated by (playercount) * (playercount - 1). In this example, a total of 112 players are together in an area. The server was running in an arch linux desktop environment with an AMD Ryzen 5 3600X CPU.

Performance overview with 42 players

### Supported Software | Server Version | Paper | Folia | Fabric | |:--------------:|:-----:|:-----:|:------:| | 1.21.5 | ✅ | ✅ | ❌ | | 1.21.4 | ✅ | ✅ | ✅ | | 1.21.3 | ✅ | ❌ | ❌ | | 1.21.2 | ✅ | ❌ | ❌ | | 1.21.1 | ✅ | ❌ | ❌ | | 1.21 | ✅ | ❌ | ❌ | #### Dependencies on Fabric: - [Fabric API](https://github.com/FabricMC/fabric) ## Usage PlayerCulling can be installed like any other bukkit plugin. Place the jar file in your `plugins` directory. On Fabric as well, just place the jar file and the dependencies listed above in your `mods` directory and restart your server. ### Configuration After the first start, PlayerCulling will automatically create a configuration file. On paper under `plugins/PlayerCulling/config.yml` or on Fabric `config/playerculling.yml`. In there, you are able to configure the following options: - `config-version`: Don't touch this - `scheduler`: - `max-threads`: The maximum amount of threads allowed to use (default: `cpu threads / 3`) - `cleanup-interval`: The interval to check for cleanup of threads in seconds (default: `30`) - `container-ttl`: The time-to-live of unused threads (default: `30`) - `max-cull-time`: The maximum time a thread is allowed to have in milliseconds (default: `45`) - `max-transfer-factor`: If the load percentage of a thread is below this factor, it is allowed to accept more tasks from other overloaded threads (default: `0.7`) - `max-merge-factor`: If the combined load percentage of two threads is below this factor, the two threads are allowed to merge together (default: `0.5`) - `updater`: - `enabled`: Enables/disables the update checker (default: `true`) - `notify-admins`: Whether to notify admins about new PlayerCulling releases (default: `true`) - `interval-hours`: The update check interval in hours (default: `24`) Note: If you're not sure what a configuration option does, it's best to leave it at its default value. ### Permissions | Permission | Description | |-------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `playerculling.update-notify` | If not disabled, players with this permission will receive update notifications | | `playerculling.bypass` | Players with this permission will be ignored by PlayerCulling and therefore be able to always see anyone. Use commands (`/playerculling toggle`) or API instead of this permission if possible | See the table below for command permissions. ### Commands | Command | Description | Permission | |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------| | `/playerculling blockdebug [raw] [block]`
`/playerculling blockdebug [block]` | Checks the occluding status of a block in sight of the target entity or specified by the `block` argument. The `raw` argument specifies, if `true` get status from minecraft world, if `false` get status from PlayerCulling occlusion cache. | `playerculling.command.blockdebug` | | `/playerculling chunkcache` | Gives information about the stored chunks in the PlayerCulling occlusion cache. If the executor is an entity, you will get more information about the entity's chunk. | `playerculling.command.chunkcache` | | `/playerculling chunksizes` | Gives the byte size of each chunk in the executors world. You can click on a chunky entry to teleport. | `playerculling.command.chunksizes` | | `/playerculling cleancontainers [force]` | Triggers the cleanup process manually. The `force` argument decides if you check for the ttl or not. | `playerculling.command.cleancontainers` | | `/playerculling viewcontainers` | Toggles the view of the container scheduler. It shows the status, load and player count. Please note: The boss bar count is limited by your gui size, minecraft only renders boss bars over one third of the windows size. | `playerculling.command.viewcontainers` | | `/playerculling hidden` | Shows the hidden list of the executor. | `playerculling.command.hidden` | | `/playerculling performance` | Toggles the view of the PlayerCulling performance, overall occlusion cache size, and culled players count. Please note: The boss bar count is limited by your gui size, minecraft only renders boss bars over one third of the windows size. | `playerculling.command.performance` | | `/playerculling raycastdebug [showRay]`
`/playerculling raycastdebug [blocks]`
`/playerculling raycastdebug [blocks] [showRay]` | Checks if the executor can see the `target-player`, the executor must be a player. The `showRay` argument enables particles of the rays. The `blocks` arguments prints all checked blocks in the ray. | `playerculling.command.raycastdebug` | | `/playerculling reloadconfig` | Reloads the configuration. | `playerculling.command.reloadconfig` | | `/playerculling toggle global [enabled]`
`/playerculling player ` | Toggles PlayerCulling either for a `player-list` or `global`. The `enabled` argument can be used to always enable (`true`) or disable (`false`) PlayerCulling for the target -> no toggle. | `playerculling.command.toggle`, `playerculling.command.toggle.global`, `playerculling.command.toggle.player` | Note: `[...]` is an optional argument, `<...>` is a required argument PlayerCulling uses brigadier for commands which means command blocks and datapacks are also able to use these commands. Additionally, this also means `/execute` can recognize these commands and you are able to change the executor/location of the executed command. For example: - `/execute as Notch run playerculling hidden` will show you the hidden players of the player `Notch`, if online - `/execute as @a run playerculling hidden` will show you the hidden players of everyone online ### API setup `PlayerCulling` has to be added as a dependency to the `plugin.yml` regardless of the build system used. On Fabric add `playerculling` to the `fabric.mod.json` file.

Maven

```xml tjcserver https://repo.minceraft.dev/releases/ ``` ```xml de.pianoman911 playerculling-api 2.0.2-SNAPSHOT provided ```

Gradle (groovy)

```groovy repositories { maven { url = 'https://repo.minceraft.dev/releases/' name = 'tjcserver' } } dependencies { compileOnly 'de.pianoman911:playerculling-api:2.0.2-SNAPSHOT' } ```

Gradle (kotlin)

```kotlin repositories { maven("https://repo.minceraft.dev/releases/") { name = "tjcserver" } } dependencies { compileOnly("de.pianoman911:playerculling-api:2.0.2-SNAPSHOT") } ```

### API usage Basic paper plugin example: ```java public class ExamplePlugin extends JavaPlugin { @Override public void onEnable() { // this loads the player culling api from bukkit's services manager PlayerCullingApi api = Bukkit.getServicesManager().load(PlayerCullingApi.class); // example: disable culling for the player "Notch", if online Player player = Bukkit.getPlayer("Notch"); if (player != null) { api.setCullingEnabled(player.getUniqueId(), false); } } } ``` Basic fabric mod example: ```java public class ExampleMod implements ModInitializer { @Override public void onInitialize() { FabricLoader.getInstance().getObjectShare().whenAvailable("playerculling:api", (__, obj) -> { if (!(obj instanceof PlayerCullingApi api)) { return; } // Toggle global culling api.setCullingEnabled(false); }); } } ``` ## Building 1. Clone the project (`git clone https://github.com/MinceraftMC/PlayerCulling.git`) 2. Go to the cloned directory (`cd PlayerCulling`) 3. Build the jar (`./gradlew build` on Linux/MacOS, `gradlew build` on Windows) The PlayerCulling jars can be found in the `build` → `libs` directory. ### Contributing If you want to contribute to PlayerCulling, feel free to fork the repository and create a pull request. Please make sure to follow the code style and conventions used in the project. If you have any questions or need help, feel free to ask in our [Discord](https://discord.gg/zC8xjtSPKC). You can test your changes by running `./gradlew plugin-paper:runServer` or `./gradlew platform-fabric:runServer`. This will start a local development server with the compiled plugin or mod automatically installed. This can be combined with the debugger of your IDE.
Please note that the update checker will be automatically disabled when running in a development environment.

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