🐍 ViperAntiXray (1.21.x – 26.x)

🎯 What Is ViperAntiXray?

ViperAntiXray is a server-side only Fabric mod that completely eliminates X-ray cheating by obfuscating chunk packets sent to clients. Unlike texture-pack based solutions or client-side "anti-cheat" mods, ViperAntiXray operates at the network layer — the server sends fake block data for unexposed ores, and only reveals real blocks when players legitimately mine adjacent blocks, trigger explosions, or gain direct line-of-sight.

Key differentiator: Zero client installation required. Vanilla players connect normally and see legitimate world generation. X-ray users see only stone, deepslate, and configurable fake ores.

🛡️ Core Anti-Xray Engine (Unmodified)

The heart of ViperAntiXray is a faithful port of Paper's Async Anti-Xray patch — the same battle-tested engine protecting thousands of Paper/Spigot servers since 1.17. We did not modify the core obfuscation logic. Instead, we wrapped it in a Fabric/Architectury module and extended it with event-driven feature modules.

Engine Modes

How It Works (Simplified)

Chunk Packet Sent → Async Worker Thread → Palette Analysis → Block Classification
                                                               ↓
                              Reveal? ← Adjacent Air/Transparent? ← Hidden Block?
                                 ↓                                         ↓
                            Yes → Send Real Block              No → Send Fake/Replacement

• Async processing: Chunk packet transformation runs on dedicated worker threads (configurable pool size)
• Zero main-thread impact: World generation, entity ticking, and player movement never block on obfuscation
• Per-dimension config: Each dimension can use different engine modes, heights, and block lists

⚙️ Configuration

File: config/viperantixray-fabric.toml (auto-generated on first run)

Default Configuration

# Default values
enabled = false
usePermission = false

# World specific values
[overworld]
enabled = true
engineMode = 3
maxBlockHeight = 256
updateRadius = 2
lavaObscures = false
hiddenBlocks = ["#c:ores", "raw_copper_block", "raw_iron_block", "raw_gold_block", "!#viperantixray:hidden_only_ores"]
replacementBlocks = ["#viperantixray:hidden_only_ores", "stone", "deepslate", "andesite", "calcite", "diorite", "dirt", "granite", "gravel", "sand", "tuff", "mossy_cobblestone", "obsidian", "clay", "infested_stone", "amethyst_block", "budding_amethyst", "chest"]

[the_nether]
enabled = true
engineMode = 1
maxBlockHeight = 128
updateRadius = 2
lavaObscures = true
hiddenBlocks = ["ancient_debris", "nether_quartz_ore", "nether_gold_ore", "gold_block", "gilded_blackstone"]

Config Option Overview

Note: Blocks / block tags can be prefixed ! to remove them from the block list. Rules are applied left-to-right; removals should be specified after additions. (since 1.4.10)

Custom Dimensions

To configure ViperAntiXray in custom dimensions, specify the dimension ID:

[dimensions."custom:cool_world"]
enabled = true
engineMode = 3
maxBlockHeight = 256
updateRadius = 2
lavaObscures = false
hiddenBlocks = ["#c:ores", "raw_copper_block"]
replacementBlocks = ["stone", "deepslate"]

🛡️ Engine Mode Details

EngineMode 1 — Hide

Replaces all fully obscured (no air around) blocks from hiddenBlocks with blocks from replacementBlocks. Only hidden blocks completely surrounded by other blocks are affected.

EngineMode 2 — Multiply

Replaces all blocks from hiddenBlocks and replacementBlocks with random blocks from hiddenBlocks. Creates a field of fake ores that overwhelm X-ray HUDs.

EngineMode 3 — Smart (Recommended)

Works very similar to engine mode 2, but works better with slow connections. Uses packet coalescing to reduce desync for high-ping players.

Legit Player View

Legit players won't notice any changes when this mod is installed (unless they have high ping or modify a lot of blocks at once, e.g., explosions).

📋 Mod Developers

Ore blocks added to the #viperantixray:hidden_only_ores block tag will be hidden from the world, but not used as fake ore. This is useful if your ore has effects (particles, sounds) that could cause problems.

// data/viperantixray/tags/block/hidden_only_ores.json
{
  "replace": false,
  "values": [
    "mymod:custom_ore",
    "mymod:rare_gem_ore"
  ]
}

✨ What Was Added (11 New Feature Modules)

All features are implemented as independent modules in me.drex.viperantixray.common.features.* — they hook via Fabric events and never touch the core engine.

1. 🍯 Honey-Pot / Fake Ore Traps

Generates fake ore veins deep underground that only X-ray users can see. Mining them instantly flags the cheater.

• Placement: Configurable density per chunk (default: 0.1% of blocks below Y=16)
• Blocks: Diamond, Emerald, Ancient Debris, custom ores via tag #viperantixray:honey_pots
• Detection: When a player mines a honey-pot block:
  • Increments suspicion_score in viperantixray:player_data NBT
  • Sends alert to all ops with viperantixray.alerts permission
  • Optional Discord webhook with embed (player, coords, block, timestamp)
  • Logs to logs/viperantixray/honeypot.log (JSONL format for SIEM ingestion)

2. 📊 Mining Analytics & Suspicion Scoring

Tracks every block break per player, computes Mining Efficiency Ratio (ores/stone), and flags statistical outliers.

• Metrics: total_blocks_mined, ores_mined (by type), stone_broken, efficiency_ratio = ores / stone, session_time, chunks_visited, depth_distribution
• Suspicion Algorithm: Rolling mean/stddev per dimension; flagged when efficiency_ratio > mean + (threshold * stddev) (default: 3.5σ)
• Commands: /viperantixray audit <player>, /viperantixray auditlist

3. 🎯 Proximity & Raycast Decaying

Dynamically disables obfuscation along the player's direct line of sight using fast voxel raycasting.

• Raycast every N ticks (default: 4 ticks = 5x/sec per player)
• Radius: Configurable cone angle (default: 15°) and distance (default: 48 blocks)
• Bandwidth savings: ~40% fewer fake blocks sent to clients on high-pop servers

4. 🔄 Adaptive Engine Modes

Automatically downgrades engine mode under load to prevent ghost blocks, desync, and TPS crashes.

5. ⚙️ Async Thread Pool

Offloads entire chunk packet obfuscation pipeline off the main thread.

• Worker threads: Configurable (default: CPU cores / 2, min 2, max 8)
• Queue: Bounded blocking queue (default: 128 chunks)
• Backpressure: Falls back to synchronous processing if queue full (logged)

6. 🎯 Sub-Chunk Culling

Restricts obfuscation to sub-chunks (16×16×16) at or below player's Y-level + margin.

• Culling logic: Only process sections where sectionY <= (playerY >> 4) + cullingMargin
• Default margin: 2 sections (32 blocks above player)
• Savings: ~60% fewer palette analyses per chunk packet on surface players

7. 🔇 Sound & Light Concealment

Mutes block sounds for fully encased blocks, defeating sound-based ESP/X-ray.

• Blocks covered: Amethyst chimes, Sculk vibrations, Lava pops, Pointed dripstone drips
• Mechanism: Fully surrounded sound-emitting blocks never send the state that triggers sounds

8. 💥 Explosion & Vein-Miner Protection

Batch-reveals all hidden ores in a single packet during large-scale block destruction.

• Triggers: TNT, beds, respawn anchors, VeinMiner/Excavator, WorldEdit, large creepers
• Mechanism: Collects changes in 5-tick window, sends ONE consolidated chunk packet
• Prevents: Ghost stone rendering lag, desync, client FPS drops

9. 🌍 Built-in Dimension Profiles

Zero-config protection for vanilla and popular modded dimensions.

Pre-configured profiles for: Overworld, Nether, End, Deep Dark, Aether, Twilight Forest, Betweenlands (auto-detected if mod present).

10. 👁️ In-Game Admin Inspection

Ops in spectator mode can toggle "Anti-Xray Vision" to see exactly what players see — instantly, no relog.

• Command: /viperantixray inspect [on|off|toggle]
• Visual: Obfuscated blocks highlighted with green outline particles (client-side only)
• HUD: Engine mode, culling status, async queue depth, TPS impact

11. 📝 Live Block List Editing

Modify hidden/replacement blocks at runtime with instant hot-reload — no server restart.

• Supports tags: #c:ores, #minecraft:deepslate_ores, #viperantixray:honey_pots
• Negation: !#tag removes from list (processed left-to-right)

🔧 Commands Reference

Permission defaults: All viperantixray.* default to op only. Use LuckPerms to grant to staff roles.

📊 Performance Benchmarks

Tested on: i7-12700K, 32GB DDR5-5600, Paper 1.21.1 baseline, 20 players simulated via Spark profiler

🛠️ Installation

Requirements

• Fabric Loader: 0.14.21+ (1.21.x) / 0.19.3+ (26.x)
• Fabric API: Matching your Minecraft version
• Java: 21 (1.21.x) or 25 (26.x)

Steps

1. Download the correct JAR for your Minecraft version
2. Place in mods/ folder (server only — client not required)
3. Start server once → generates config/viperantixray-fabric.toml
4. Edit config if needed (dimension profiles, honeypot, analytics, etc.)
5. Run /viperantixray reload or restart
6. Verify with /viperantixray status

🔄 Migration from Other Anti-Xray

From Paper/Spigot Native

• Config syntax nearly identical (paper.yml → viperantixray-fabric.toml)
• Engine modes 1:1 compatible
• Dimension IDs: world → minecraft:overworld, world_nether → minecraft:the_nether, etc.

From Orebfuscator / EngineMode2 / AntiXray (Bukkit)

• Engine modes map directly
• Block lists: copy hidden-materials → hiddenBlocks, replacement-materials → replacementBlocks
• No more update-radius per-world — now per-dimension in TOML

From Client-Side Mods

• No client changes needed — ViperAntiXray is 100% server-side
• Remove client mods from player packs to reduce confusion

❓ Troubleshooting / FAQ

Q: Players see "ghost blocks" / blocks reappear after mining
A: Increase updateRadius in dimension config (default 2). High ping players may need 3-4. Check /viperantixray status for async queue depth.

Q: TPS drops when many players join
A: Enable async.enabled=true, increase async.workerThreads, reduce culling.marginSections to 1.

Q: Honeypots not triggering
A: Verify honeypot.enabled=true, check honeypot.minY/maxY matches world height, ensure hiddenBlocks includes target ores.

Q: Modded ores not hidden
A: Add to hiddenBlocks in dimension config, or use #viperantixray:hidden_only_ores tag in your mod's data pack.

Q: Config changes not applying
A: Run /viperantixray reload — some settings (engine mode, block lists) hot-reload; dimension add/remove requires restart.

Note: The previous release was broken (wrong author metadata, missing version fields, bloated source zips with build artifacts). This version is a complete rebuild from source with all fixes applied.

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