InteractionVisualizer — EllanServer Paper 26 fork

This fork is a Paper-only, performance-focused rewrite of LOOHP/InteractionVisualizer. It visualizes crafting and functional blocks with native display entities while preserving the familiar commands, preferences, and configuration layout.

Supported server versions

• Paper 26.1.2 (primary target)
• Paper 26.2 (compile-verified compatibility target)
• Java 25

Other Minecraft versions, Spigot, and Folia are intentionally unsupported. The plugin checks the running Minecraft version during startup and disables itself outside the supported range.

Rewrite highlights

• Native Paper ItemDisplay and TextDisplay entities replace Armor Stands.
• Dropped-item visuals use shaded Sparrow Heart client-side vanilla ITEM entities. Empty Paper display anchors retain tracker and chunk lifecycle without enabling server item collision physics.
• One Paper API implementation replaces the old in-project per-version NMS modules. InteractionVisualizer uses Heart 0.72 only for the client-side item packet path on the supported 26.1/26.2 runtimes.
• Per-viewer anchor visibility uses Paper's showEntity / hideEntity API; tracker enter/leave events create and destroy the matching virtual ITEM.
• Static items bob and spin entirely client-side with no animation task; only active gravity motion needs per-viewer correction because Heart marks its fake items as no-gravity.
• Block-to-player pickup uses Minecraft's native take-item packet through one isolated reflection bridge. The client supplies the vanilla sound and three-tick live-target absorption; arbitrary location-to-location throws keep the existing custom motion path. No Sparrow fork or ProtocolLib is required.
• Display updates are revision-coalesced; there is no 5 ms packet scan loop.
• Player/chunk proximity queries use one allocation-light snapshot per world and server tick.
• Configuration is loaded with Sparrow YAML and flattened into an immutable O(1)-lookup snapshot after every reload.
• Gradle replaces the former Maven multi-module build and verifies the same sources against both supported Paper API lines.

Other Sparrow modules were deliberately not added: metadata, reflection, NBT, and Redis messaging do not serve this single-server rendering path.

Building

./gradlew clean check shadowJar

On Windows:

gradlew.bat clean check shadowJar

The production plugin JAR is written to build/libs/InteractionVisualizer-<version>.jar. check includes unit tests, the Paper 26.1.2 compilation, and a second compile against Paper 26.2.

Performance rollout and diagnostics

New installations enable the bounded visibility restore, dropped-label spatial culling, static packet items, static animation anchors, and coordinated block updates. Existing explicit false values remain unchanged and produce one migration reminder. Every path has its own rollback switch in config.yml; event-driven block updates require a restart, while the other switches reload.

Use /iv perf start <label> and /iv perf stop around a stable sample window. The resulting IV_PERF JSON includes viewer candidates/full reconciles, dropped-item spatial and full-scan candidates, block queues, preference I/O and SQL operations, packet operations, and anchor entity operations. Every plugin disable also emits IV_PERF_SHUTDOWN; totalRetained should be zero in repeated enable/disable leak tests.

Optional integrations

• CraftEngine 26.7.2: optional custom-item ID recognition. CraftEngine items can be selected by the third field of an item-label blacklist rule, and their display pose can be overridden in material.yml under CustomItems. It also supplies display lighting: InteractionVisualizer shares its light-block reference counts so CraftEngine furniture and IV displays do not remove each other's light, and performs no lighting task while idle. With Settings.HideIfViewObstructed, IV registers only its sent-chunk candidates in CraftEngine's entity-culling API for a second-stage ray-traced wall-occlusion check. CraftEngine is not bundled and the plugin behaves exactly as before when it is absent.
• OpenInv
• PlaceholderAPI
• Essentials, SuperVanish, PremiumVanish, and CMI

Language resources remain available from InteractionVisualizerLanguages.

License and upstream

This project remains licensed under GPL-3.0. Original project pages:

• GitHub
• Modrinth
• Hangar
• SpigotMC