LOD Server Support

Distributes LOD (Level of Detail) chunk data from servers to connected clients over a custom networking protocol. Built primarily as a multiplayer backend for Voxy clients request distant chunks in batches, the server reads them from disk or memory and streams the data back, enabling Voxy to render terrain far beyond the vanilla render distance on multiplayer servers. The result: players see fully rendered terrain out to hundreds of chunks on multiplayer servers, without needing to explore the world first.

Supports Fabric clients and Fabric, Paper, Purpur, Folia servers.

See https://github.com/VoX/lod-server-support for the most up to date documentation.

Demo Video: https://github.com/user-attachments/assets/721fb344-890e-4e03-ab36-539444427f7b

Installation

Install LOD Server Support (LSS) on both the server (Fabric mod or Paper plugin) and every client (LSS Fabric mod + Voxy). Without LSS on both the connecting client and on the server it will not function.

Redistribution

This mod is MIT-licensed — redistribution with attribution is welcome, and modpacks can reference the official Modrinth project directly. Per Modrinth's reupload policy: XANTHA via Voxy Server Side has the copyright holder's explicit permission to distribute this mod, and derivatives of it, on Modrinth.

Fabric Client

1. Install Voxy and place lod-server-support-fabric.jar in the client's mods/ directory
2. Join a server running LSS — client config is generated at config/lss-client-config.json

Fabric Server

1. Place lod-server-support-fabric.jar in the server's mods/ directory
2. Install the Fabric mod and Voxy on all clients
3. Restart the server — config is generated at config/lss-server-config.json

Paper/Purpur/Folia Server

1. Place lod-server-support-paper.jar in the server's plugins/ directory
2. Install the Fabric mod and Voxy on all clients
3. Restart the server — config is generated at plugins/LodServerSupport/lss-server-config.json

Commands

Server (Fabric and Paper)

• /lsslod stats - Show per-player transfer statistics
• /lsslod diag - Show detailed diagnostics (config, bandwidth, queue depths)

Client (Fabric only)

• /lss clearcache - Clear the local column cache, forcing all chunks to be re-requested from the server
• /lss diag - Show client-side diagnostics (connection, throughput, scan progress, request budget)

Configuration

Server (Fabric and Paper)

Server config is generated on first run:

• Fabric: config/lss-server-config.json
• Paper: plugins/LodServerSupport/lss-server-config.json

Setting	Default	Description
enabled	true	Enable LOD distribution
lodDistanceChunks	256	Max LOD distance in chunks
bytesPerSecondLimitPerPlayer	20971520	Per-player pre-compression bandwidth cap (20 MB/s)
bytesPerSecondLimitGlobal	104857600	Total pre-compression bandwidth cap (100 MB/s)
diskReaderThreads	5	Thread pool size for async disk reads
sendQueueLimitPerPlayer	4000	Max queued column payloads per player (each carries a full chunk column of sections)
syncOnLoadConcurrencyLimitPerPlayer	200	Max in-flight sync requests per player
generationConcurrencyLimitPerPlayer	16	Max in-flight generation requests per player
enableChunkGeneration	true	Generate missing chunks on demand for LOD data
generationConcurrencyLimitGlobal	32	Max chunks generating server-wide at once
generationTimeoutSeconds	60	Timeout for pending chunk generation
perDimensionTimestampCacheSizeMB	32	Max timestamp cache size per dimension in MB (used for up-to-date checks on reconnect)
dirtyBroadcastIntervalSeconds	10	Interval for pushing dirty column notifications to clients

Paper-specific: The config also includes an updateEvents list of Bukkit event class names used for dirty chunk detection. /lsslod commands require the lss.admin permission (or op).

Client

Client config is generated at config/lss-client-config.json on first run.

Setting	Default	Description
receiveServerLods	true	Enable receiving LOD data from the server
lodDistanceChunks	0	Max LOD request distance in chunks (0 = use server limit)

License

MIT