Interaction rework

src/drag/draggable_camera.gd

@@ -1,11 +1,13 @@
 extends Camera3D
 
+class_name DraggableCamera
+
 const SENSITIVITY = 0.01
 
 var interaction_source: DraggableObject
 var plane_position: Vector3
 @onready var drag_raycast: RayCast3D = $DragRaycast
-@onready var interaction_area: Area3D = $InteractionArea
+@onready var interaction_area: InteractibleDetector = $InteractionArea
 
 func _process(_delta: float) -> void:
 	drag_raycast.target_position = project_local_ray_normal(get_viewport().get_mouse_position()) * 10.0
@@ -18,10 +20,21 @@ func _input(event: InputEvent) -> void:
 		global_position += Vector3.FORWARD * event.relative.y * SENSITIVITY
 	
 	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
-		var areas = interaction_area.get_overlapping_areas()
-		for area in areas:
-			if area == interaction_source:
+		for draggable in interaction_area.filtered_draggables:
+			if draggable == interaction_source:
 				continue
-			area.try_interact(interaction_source)
+			interaction_source.interactible.try_interact(draggable)
 			break
-		interaction_source = null
+		end_interaction_seeking()
+
+func start_interaction_seeking(new_interaction_source: DraggableObject) -> void:
+	if new_interaction_source.interactible == null:
+		return
+	interaction_source = new_interaction_source
+	interaction_area.set_mask(interaction_source.interactible.get_groups())
+
+func end_interaction_seeking() -> void:
+	if interaction_source == null:
+		return
+	
+	interaction_source = null

src/drag/draggable_object.gd

@@ -6,7 +6,17 @@ signal drag_started
 signal drag_ended
 
 var mouse_in: bool = false
-var dragged: bool = false
+var dragged: bool = false:
+	set(value):
+		if dragged != value:
+			if value:
+				drag_started.emit()
+				get_viewport().get_camera_3d().start_interaction_seeking(self)
+			else:
+				drag_ended.emit()
+		dragged = value
+
+@export var interactible: Interactible
 
 func _mouse_enter() -> void:
 	mouse_in = true
@@ -24,8 +34,5 @@ func _input(event: InputEvent) -> void:
 	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
 		if mouse_in and event.pressed:
 			dragged = true
-			drag_started.emit()
-			get_viewport().get_camera_3d().interaction_source = self
 		if event.pressed == false:
 			dragged = false
-			drag_ended.emit()

src/interactible/interactible.gd

@@ -16,8 +16,8 @@ func _ready() -> void:
 		canceled.connect(cancel_interaction)
 
 func try_interact(draggable: DraggableObject) -> void:
-	if draggable.get_node("%Interaction") != null:
-		var interaction: Interactible = draggable.get_node("%Interaction")
+	if draggable.interactible != null:
+		var interaction: Interactible = draggable.interactible
 		for group in interaction.get_groups():
 			if group in interaction_target_groups:
 				current_draggable = draggable

src/interactible/interactible_detector.gd

@@ -0,0 +1,37 @@
+extends Area3D
+
+class_name InteractibleDetector
+
+var mask: PackedStringArray
+var contacted_draggables: Array[DraggableObject]
+var filtered_draggables: Array[DraggableObject]
+
+func set_mask(new_mask: PackedStringArray) -> void:
+	mask.clear()
+	mask.append_array(new_mask)
+	filtered_draggables.clear()
+	for contacted in contacted_draggables:
+		filtered_draggables.append(contacted)
+
+func _ready() -> void:
+	area_entered.connect(on_area_entered)
+	area_exited.connect(on_area_exited)
+
+func on_area_entered(area: Area3D) -> void:
+	if area is DraggableObject:
+		contacted_draggables.append(area)
+		if is_in_mask(area.get_groups()):
+			filtered_draggables.append(area)
+
+func on_area_exited(area: Area3D) -> void:
+	if area is DraggableObject:
+		contacted_draggables.erase(area)
+		if filtered_draggables.has(area):
+			filtered_draggables.erase(area)
+
+func is_in_mask(groups: Array[StringName]) -> bool:
+	for group in groups:
+		if group in mask:
+			return true
+	return false
+	

src/interactible/interactible_detector.gd.uid

@@ -0,0 +1 @@
+uid://d77lra3ar60b

src/ui/drag_and_drop.gd

@@ -5,9 +5,9 @@ extends Button
 
 func _on_button_down() -> void:
 	var scene = draggable.scene_to_spawn.instantiate()
+	get_tree().current_scene.add_child(scene)
 	if scene is DraggableObject:
 		scene.dragged = true
 		scene.mouse_in = true
-	get_tree().current_scene.add_child(scene)
 	var camera = get_viewport().get_camera_3d()
-	scene.global_position = camera.project_position(get_global_mouse_position(),1.8)
+	scene.global_position = camera.plane_position

src/ui/reagent_drag_and_drop.gd

@@ -8,10 +8,11 @@ func _ready() -> void:
 
 func _on_button_down() -> void:
 	var scene = reagent.storage.instantiate()
+	
+	scene.get_node("SubstanceData").substance = reagent.substance
+	get_tree().current_scene.add_child(scene)
 	if scene is DraggableObject:
 		scene.dragged = true
 		scene.mouse_in = true
-	scene.get_node("SubstanceData").substance = reagent.substance
-	get_tree().current_scene.add_child(scene)
 	var camera = get_viewport().get_camera_3d()
-	scene.global_position = camera.project_position(get_global_mouse_position(),1.8)
+	scene.global_position = camera.plane_position