save code

Scripts/PlayParticleSystems.gd

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+@tool
+extends Node3D
+
+@export var play_particles: bool = false: 
+	set(value):
+		if value:
+			_find_particles()  # Always scan for new particles
+			_cleanup_delays()  # Remove deleted particles from the list
+			_start_delays()  # Ensure delays exist for new particles
+			_play_particles()
+		play_particles = false  # Reset the checkbox immediately
+
+var particle_systems: Array
+@export var delays: Dictionary
+
+@export var cleanDelays: bool = false: 
+	set(value):
+		if value:
+			delays.clear()
+		cleanDelays = false
+
+func _find_particles():
+	particle_systems.clear()  # Always clear and re-detect
+	var existing_delays = delays.duplicate()  # Preserve existing delays
+
+	for child in get_children():
+		if child is GPUParticles3D:
+			particle_systems.append(child)
+			if not existing_delays.has(child.name):
+				existing_delays[child.name] = 0.0  # Assign default delay
+
+	delays = existing_delays  # Restore old delays + new ones
+
+func _cleanup_delays(): # Remove delays for particles that no longer exist	
+	var valid_particle_names = particle_systems.map(func(p): return p.name)
+	for key in delays.keys():
+		if key not in valid_particle_names:
+			delays.erase(key)  # Remove old particle system references
+
+func _start_delays():
+	for particle in particle_systems:
+		if not delays.has(particle.name):
+			delays[particle.name] = 0.0  # Keep existing delays, add new ones
+
+func _play_particles():
+	for particle in particle_systems:
+		var delay = delays.get(particle.name, 0.0)
+		_playDelay(particle, delay)
+		
+func _playDelay(ps: GPUParticles3D, delay: float):
+	ps.emitting = false  # Reset first (prevents issues)
+	await get_tree().create_timer(delay).timeout
+	ps.restart()  # Works in play mode
+	ps.emitting = true   # Start emitting