AntiXRay — High-Performance Raytrace Anti-XRay

Prevents X-Ray clients from seeing ores and hidden blocks using a Digital Differential Analyser (DDA) raytracing algorithm. Only blocks a player can legitimately see are sent — everything else is replaced with innocent stone in the chunk packet before it leaves the server.

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🔭 How It Works

Player Eye ──── DDA ray (7 origins, N steps) ────► [Diamond Ore]
                              ↑
                   Blocked by solid block?
                   YES → send fake stone
                   NO  → reveal real block

For every protected block in view distance, 7 rays are cast from around the player's eye position. If any single ray arrives unobstructed, the block is revealed. Otherwise the client receives a harmless replacement block. The inner loop is intentionally simple so the JVM's JIT compiler can auto-vectorise it with SIMD instructions.

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⚙️ Engine Modes

Mode	Security	CPU cost	Description
RAYTRACE	⭐⭐⭐	Medium	Full DDA raytracing for every protected block
PROXIMITY	⭐⭐	Low	Hide blocks with no adjacent air/transparent neighbour
HYBRID ✅	⭐⭐⭐	Low–Medium	Proximity first, raytrace only on blocks that pass — recommended

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✨ Features

• DDA Raytracing — 7 ray origins per block, configurable step count (default: 12)
• Work-stealing thread pool — ForkJoinPool auto-sized to CPU cores, chunk sections processed in parallel
• Lock-free TTL cache — ConcurrentHashMap-backed cache with configurable TTL, avoids recomputing the same ray twice
• TPS guard — automatically skips heavy processing when server TPS drops below a configurable threshold
• Per-world configuration — independent engine mode, ore list, and replacement block per world
• Folia native support — RegionScheduler + AsyncScheduler via reflection, respects per-region tick budgets
• X-Ray detection — 60-second sliding window per player with per-category thresholds (diamond, ancient debris, emerald, generic)
• Detection alerts — staff chat notifications, log file, custom punishment commands with %player% / %world% / %x%/%y%/%z% placeholders
• Full 1.16–1.21 ore list — deepslate ores, Ancient Debris, Trial Spawner, Vault, Spawner, Chests
• Bypass permission — antixray.bypass for trusted staff and creative players

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🖥️ Platform Compatibility

Platform	Status	Notes
Bukkit / CraftBukkit	✅ Full	Standard BukkitScheduler, block-update fallback
Spigot	✅ Full	All Spigot optimisations respected
Paper	✅ Full	Async chunk API, packet-level interception
Purpur	✅ Full	All Paper features + Purpur config detected
Folia	✅ Full	folia-supported: true, RegionScheduler via reflection

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🚨 X-Ray Detection

Detection thresholds (all configurable in config.yml):

Category	Default threshold
Diamond ore	6 per minute
Ancient Debris	3 per minute
Emerald ore	8 per minute
Generic ores	15 per minute

Alert actions: in-chat staff notification · log file (plugins/AntiXRay/logs/detections.log) · custom commands

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📋 Commands

Aliases: /antixray, /axr, /xray

Command	Description
/axr reload	Reload config.yml without a server restart
/axr status	Show engine mode, thread count, ray counters, cache size
/axr debug	Show current debug mode status
/axr bypasslist	List all online players with bypass permission

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🔑 Permissions

Node	Default	Description
antixray.admin	op	Access to all /axr commands
antixray.bypass	false	Skip obfuscation — for trusted staff / creative mode
antixray.notify	op	Receive in-chat X-Ray detection alerts

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⚡ Performance Presets

Server size	ray_steps	cache_ttl_ticks	async_processing
Small (< 50 players)	16	2	true
Medium (50–200)	12	4	true
Large (200+)	8	8	true
Budget VPS	4	10	false

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📦 Installation

1. Drop AntiXRay-2.0.0.jar into your plugins/ folder
2. Start / restart the server — plugins/AntiXRay/config.yml is generated automatically
3. Tune settings for your server size
4. Run /axr reload

Requirements: Java 17+ · Minecraft 1.16.x – 1.21.x · Any Bukkit-compatible server

Build from source:

mvn clean package
# Output: target/AntiXRay-2.0.0.jar

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📜 License

MIT License — free to use, modify, and redistribute.

Minecraft	1.7.x-1.21.x
Server Software	Paper, Purpur, Folia, Bukkit, Spigot
Java	21+
ProtocolLib	Please use the Newst Version