Message

Category: Executor Tier: Basic

Purpose

Sends messages to other objects via the MessageBus system, enabling object-to-object communication and event broadcasting.

Visual Reference

As added to your scene

When To Use

• Event broadcasting (boss dies -> trigger cutscene)

• Combat systems (projectile hits -> deal damage)

• UI updates (score changes -> update HUD)

• Quest systems (item collected -> check completion)

• State synchronization (button pressed -> open door)

• Audio cues (footstep -> play sound at location)

• Object spawning (enemy dies -> spawn loot)

Runtime Behavior

Executes: When activated, broadcasts a message to specified recipients

Generated UI Mockup — showing expanded properties

Message

-

x

Name:

Label this brick...

Subject:

v

Body:

v

Target Object:

v

Scope:

v

Properties

Property	Type	Default	Notes
subject	string, “”		Message channel/topic (e.g., “hit”, “door_open”, “player_died”)
body	string, “”		Message payload/data (optional, can be empty or contain values)
target_object	string, “”		Specific object name to send to (empty = broadcast to all)
scope	option, “Global”		Global: MessageBus. Local: Direct to object (if target specified)

Example Use Cases

Broadcast Boss Death:

Property(HP, Less or Equal, 0) -> AND -> Message(subject=boss_defeated, body="", target=All)
// Multiple listeners:
// - Music system plays victory theme
// - UI shows completion message
// - Door unlocks

Deal Damage:

Collision(Player) -> AND -> Message(subject=damage, body=25, target=Player)
// Sends damage value to player object

Door Button System:

// Button object:
Collision(Player) -> AND -> Message(subject=door1_open, body="", target=Door1)

// Door object:
Message_Listener(subject=door1_open) -> AND -> Motion(move_up)

Score Update:

Collision(Collectible) -> AND -> Message(subject=score_update, body=100, target=HUD)
// Tells HUD to add 100 points

Quest System:

Sample inspector layout removed for compatibility.