Spawning Entities

Overview

EntityTrackers are the core controller for model instances in BetterModel. They manage the lifecycle, rendering, animation, and player interaction of a model attached to an entity.

Understanding Trackers

BetterModel provides three types of trackers:

EntityTracker: Attached to a living entity, synchronizes position and rotation
PlayerTracker: Specialized for player entities with player-mode body rotation
DummyTracker: Standalone models at fixed locations, not bound to any entity

Creating Entity Trackers

Basic Entity Tracker

Create a tracker attached to an entity:

import kr.toxicity.model.api.BetterModel;
import kr.toxicity.model.api.bukkit.platform.BukkitAdapter;
import kr.toxicity.model.api.tracker.EntityTracker;
import org.bukkit.entity.Entity;

Entity entity = // your entity

// Get or create a tracker
EntityTracker tracker = BetterModel.model("demon_knight")
    .map(r -> r.getOrCreate(BukkitAdapter.adapt(entity)))
    .orElse(null);

if (tracker != null) {
    // Model is now attached to the entity
    System.out.println("Model spawned: " + tracker.name());
}

getOrCreate() returns an existing tracker if the entity already has this model attached, preventing duplicates.

Creating with Custom Modifier

Use TrackerModifier to customize behavior:

import kr.toxicity.model.api.tracker.TrackerModifier;

TrackerModifier modifier = TrackerModifier.builder()
    .sightTrace(true)        // Only show when player can see it
    .damageAnimation(true)   // Play damage animation when hit
    .damageTint(true)        // Apply red tint when damaged
    .build();

EntityTracker tracker = BetterModel.model("demon_knight")
    .map(r -> r.create(BukkitAdapter.adapt(entity), modifier))
    .orElse(null);

Pre-spawn Configuration

Configure the tracker before it spawns to players:

EntityTracker tracker = BetterModel.model("demon_knight")
    .map(r -> r.create(
        BukkitAdapter.adapt(entity),
        TrackerModifier.DEFAULT,
        t -> {
            // Pre-spawn configuration
            t.update(TrackerUpdateAction.tint(0x0026FF));  // Blue tint
            t.update(TrackerUpdateAction.brightness(15, 15)); // Full bright
            t.animate("idle"); // Start with idle animation
        }
    ))
    .orElse(null);

Creating Dummy Trackers

DummyTrackers are perfect for stationary models, decorations, or custom NPCs:

import kr.toxicity.model.api.tracker.DummyTracker;
import org.bukkit.Location;

Location location = // your location

DummyTracker tracker = BetterModel.model("statue")
    .map(r -> r.create(BukkitAdapter.adapt(location)))
    .orElse(null);

if (tracker != null) {
    tracker.animate("idle");
}

Dummy Tracker with Player Skin

Create a dummy tracker using a player’s skin:

import kr.toxicity.model.api.profile.ModelProfile;
import org.bukkit.entity.Player;

Player player = // your player
Location location = // display location

DummyTracker tracker = BetterModel.limb("steve")
    .map(r -> r.create(
        BukkitAdapter.adapt(location),
        ModelProfile.of(BukkitAdapter.adapt(player))
    ))
    .orElse(null);

Moving Dummy Trackers

Update the location of a dummy tracker:

DummyTracker tracker = // your dummy tracker
Location newLocation = // new location

tracker.location(BukkitAdapter.adapt(newLocation));

Working with the Registry

Retrieving Existing Trackers

Get a tracker for an entity that already has a model:

import kr.toxicity.model.api.tracker.EntityTrackerRegistry;
import java.util.Optional;

Entity entity = // your entity

Optional<EntityTrackerRegistry> registry = BetterModel.registry(entity.getUniqueId());
registry.ifPresent(reg -> {
    EntityTracker tracker = reg.tracker("demon_knight");
    if (tracker != null) {
        tracker.animate("attack");
    }
});

Listing All Trackers for an Entity

BetterModel.registry(entity.getUniqueId()).ifPresent(registry -> {
    registry.trackers().forEach((name, tracker) -> {
        System.out.println("Model: " + name);
        System.out.println("Players viewing: " + tracker.playerCount());
    });
});

Managing Tracker Lifecycle

Spawning to Specific Players

Control which players can see the model:

import kr.toxicity.model.api.platform.PlatformPlayer;

EntityTracker tracker = // your tracker
PlatformPlayer player = BukkitAdapter.adapt(bukkitPlayer);

// Show to player
tracker.show(player);

// Hide from player
tracker.hide(player);

// Check if visible to player
boolean isVisible = !tracker.isHide(player);

Mark for Spawn

Control which players the model spawns for:

EntityTracker tracker = // your tracker

// Only spawn for specific players
tracker.markPlayerForSpawn(BukkitAdapter.adapt(player1));
tracker.markPlayerForSpawn(BukkitAdapter.adapt(player2));

// Check if can spawn for player
boolean canSpawn = tracker.canBeSpawnedAt(BukkitAdapter.adapt(player));

Pausing and Resuming

Pause tracker updates temporarily:

// Pause animations and updates
tracker.pause(true);

// Resume
tracker.pause(false);

Closing Trackers

Properly close a tracker when you’re done:

// Despawn the model (can be respawned)
tracker.despawn();

// Completely close and remove the tracker
tracker.close();

// Check if closed
if (tracker.isClosed()) {
    System.out.println("Tracker is closed");
}

Advanced Features

Custom Scaling

import kr.toxicity.model.api.tracker.ModelScaler;

tracker.scaler(ModelScaler.of(2.0F)); // Double size
tracker.forceUpdate(true); // Apply immediately

Custom Rotation

import kr.toxicity.model.api.tracker.ModelRotator;
import kr.toxicity.model.api.tracker.ModelRotation;

// Fixed rotation
tracker.rotation(() -> new ModelRotation(0F, 90F)); // Face east

// Dynamic rotation based on entity
tracker.rotator(ModelRotator.YAW); // Follow entity yaw only
tracker.rotator(ModelRotator.PITCH_AND_YAW); // Follow both

Close Event Handling

Listen for when a tracker closes:

tracker.handleCloseEvent((t, reason) -> {
    System.out.println("Tracker closed: " + reason);
    
    switch (reason) {
        case REMOVE -> System.out.println("Manually removed");
        case DESPAWN -> System.out.println("Entity despawned");
        case PLUGIN_DISABLE -> System.out.println("Plugin disabled");
    }
});

Per-Tick Tasks

Run code every tracker tick (25ms):

tracker.frame((t, bundlerSet) -> {
    // Runs every 25ms
    // Fast operations only!
});

tracker.tick((t, bundlerSet) -> {
    // Runs every Minecraft tick (50ms)
    // Use for regular updates
});

tracker.tick(20, (t, bundlerSet) -> {
    // Runs every 20 Minecraft ticks (1 second)
});

Player-Specific Models

Creating Player Trackers

Player trackers automatically handle player-specific body rotation:

import org.bukkit.entity.Player;

Player player = // your player

EntityTracker tracker = BetterModel.limb("custom_player_model")
    .map(r -> r.getOrCreate(BukkitAdapter.adapt(player)))
    .orElse(null);

// This creates a PlayerTracker automatically
if (tracker instanceof kr.toxicity.model.api.tracker.PlayerTracker playerTracker) {
    System.out.println("Player tracker created");
}

Simplified Player Animation API

import kr.toxicity.model.api.animation.AnimationModifier;

// Shorthand for playing animations on players
boolean success = BetterModel.platform().modelManager().animate(
    BukkitAdapter.adapt(player),
    "custom_player_model",
    "wave",
    AnimationModifier.DEFAULT_WITH_PLAY_ONCE
);

Player limb models are not saved when the server restarts. They must be recreated on player join.

Common Patterns

Entity Spawn Integration

@EventHandler
public void onEntitySpawn(EntitySpawnEvent event) {
    Entity entity = event.getEntity();
    
    if (entity.getType() == EntityType.ZOMBIE) {
        BetterModel.model("demon_knight")
            .ifPresent(model -> {
                model.create(
                    BukkitAdapter.adapt(entity),
                    TrackerModifier.DEFAULT,
                    tracker -> tracker.animate("idle")
                );
            });
    }
}

Removing Models on Death

@EventHandler
public void onEntityDeath(EntityDeathEvent event) {
    Entity entity = event.getEntity();
    
    BetterModel.registry(entity.getUniqueId()).ifPresent(registry -> {
        registry.trackers().values().forEach(tracker -> {
            tracker.animate("death", AnimationModifier.DEFAULT_WITH_PLAY_ONCE, tracker::close);
        });
    });
}

Getting Started

Core Concepts

Guides

Platform Support

Overview

Understanding Trackers

Creating Entity Trackers

Basic Entity Tracker

Creating with Custom Modifier

Pre-spawn Configuration

Creating Dummy Trackers

Dummy Tracker with Player Skin

Moving Dummy Trackers

Working with the Registry

Retrieving Existing Trackers

Listing All Trackers for an Entity

Managing Tracker Lifecycle

Spawning to Specific Players

Mark for Spawn

Pausing and Resuming

Closing Trackers

Advanced Features

Custom Scaling

Custom Rotation

Close Event Handling

Per-Tick Tasks

Player-Specific Models

Creating Player Trackers

Simplified Player Animation API

Common Patterns

Entity Spawn Integration

Removing Models on Death

Next Steps

Playing Animations

Custom Hitboxes

Build docs developers (and LLMs) love

Getting Started

Core Concepts

Guides

Platform Support

Documentation Index

​Overview

​Understanding Trackers

​Creating Entity Trackers

​Basic Entity Tracker

​Creating with Custom Modifier

​Pre-spawn Configuration

​Creating Dummy Trackers

​Dummy Tracker with Player Skin

​Moving Dummy Trackers

​Working with the Registry

​Retrieving Existing Trackers

​Listing All Trackers for an Entity

​Managing Tracker Lifecycle

​Spawning to Specific Players

​Mark for Spawn

​Pausing and Resuming

​Closing Trackers

​Advanced Features

​Custom Scaling

​Custom Rotation

​Close Event Handling

​Per-Tick Tasks

​Player-Specific Models

​Creating Player Trackers

​Simplified Player Animation API

​Common Patterns

​Entity Spawn Integration

​Removing Models on Death

​Next Steps

Playing Animations

Custom Hitboxes

Build docs developers (and LLMs) love

Overview

Understanding Trackers

Creating Entity Trackers

Basic Entity Tracker

Creating with Custom Modifier

Pre-spawn Configuration

Creating Dummy Trackers

Dummy Tracker with Player Skin

Moving Dummy Trackers

Working with the Registry

Retrieving Existing Trackers

Listing All Trackers for an Entity

Managing Tracker Lifecycle

Spawning to Specific Players

Mark for Spawn

Pausing and Resuming

Closing Trackers

Advanced Features

Custom Scaling

Custom Rotation

Close Event Handling

Per-Tick Tasks

Player-Specific Models

Creating Player Trackers

Simplified Player Animation API

Common Patterns

Entity Spawn Integration

Removing Models on Death

Next Steps