Allow grabbing (and throwing) hearts

Resources/heart.gd

@@ -86,8 +86,8 @@ func _process(delta: float) -> void:
 	if get_parent() is CharacterBody3D:
 		sticky_timer -= delta
 		if sticky_timer <= 0:
-			set_physics_active(true)
 			reparent(original_parent)
+			freeze = false
 
 func on_body_entered(body: Node) -> void:
 	if not (body is CharacterBody3D): return
@@ -99,20 +99,5 @@ func on_body_entered(body: Node) -> void:
 
 	if sticky:
 		await get_tree().process_frame;
-		set_physics_active(false)
-		set_gravity_scale(0.0)
 		reparent(body)
-
-
-func set_physics_active(active: bool) -> void:
-	if active:
-		sleeping = false
-		collision_mask = 1
-		set_gravity_scale(1.0)
-	else:
-		sleeping = true
-		linear_velocity  = Vector3.ZERO
-		angular_velocity = Vector3.ZERO
-		collision_mask   = 0
-		collision_layer  = 0
-		set_gravity_scale(0.0)
+		freeze = true

Resources/heart.tscn

@@ -10,6 +10,7 @@ height = 0.04
 radius = 0.055
 
 [node name="Heart" type="RigidBody3D"]
+collision_layer = 0
 contact_monitor = true
 max_contacts_reported = 1
 script = ExtResource("1_h4gh1")

copyThrower.gd

@@ -48,9 +48,30 @@ var triggers = {
 	"TransgenderPride" : [ 0.35, pride("transgender") ],
 }
 
+const HAND_CLOSE_THRESHOLD : float = 12.0
+const HAND_OPEN_TRHESHOLD  : float =  8.0
+var hands := {
+	RightHand = { closed = false, collider = null },
+	LeftHand  = { closed = false, collider = null },
+}
+
 var queue: Array[RigidBody3D] = []
 var queue_delay := 0.0
 
+func scene_init() -> void:
+	# Reset collider values, in case hands aren't found.
+	for hand in hands.values(): hand.collider = null
+
+	var skeleton := get_skeleton()
+	if not skeleton: return
+
+	for child in skeleton.get_children():
+		var collider := child as AvatarCollider
+		if not collider: continue
+		var hand = hands.get(collider.bone_name)
+		if not hand: continue
+		hand.collider = collider
+
 func handle_channel_chat_message(
 	_cheerer_username: String,
 	_cheerer_display_name: String,
@@ -90,6 +111,7 @@ func handle_channel_chat_message(
 func _process(delta: float) -> void:
 	_apply_bumping(delta)
 	_throw_hearts_in_queue(delta)
+	_grab_with_hands()
 
 ## Applies body and head "bumping" that causes
 ## the avatar to "shake" in response to being hit.
@@ -156,6 +178,45 @@ func _throw_hearts_in_queue(delta: float) -> void:
 
 		object.global_position = pos
 		object.linear_velocity = vel
+		object.add_to_group("copyThrower/objects")
+
+func _grab_with_hands() -> void:
+	for hand in hands.values():
+		if not hand.collider: continue
+		var closedness = _hand_closedness(hand.collider)
+		# When hand has just been closed, grab nearby hearts and reparent.
+		if (not hand.closed) and (closedness > HAND_CLOSE_THRESHOLD):
+			var body: CharacterBody3D = hand.collider.get_node("CharacterBody3D")
+			var hand_center = body.to_global(Vector3(0, 0, 0.08))
+			for object: RigidBody3D in get_tree().get_nodes_in_group("copyThrower/objects"):
+				if object.global_position.distance_to(hand_center) < 0.16:
+					object.reparent(hand.collider)
+					object.global_position = hand_center
+					object.freeze = true
+			hand.closed = true
+		# When hand has just been opened, throw any grabbed hearts.
+		elif hand.closed and (closedness < HAND_OPEN_TRHESHOLD):
+			for hand_child in hand.collider.get_children():
+				var object := hand_child as RigidBody3D
+				if not object: continue
+				object.reparent(object.original_parent)
+				object.linear_velocity = Vector3(0, 1.5, 3.0) * hand.collider.global_basis + Vector3.UP
+				object.freeze = false
+			hand.closed = false
+
+static func _hand_closedness(collider: AvatarCollider) -> float:
+	var total    := 0.0
+	var skeleton := collider.get_skeleton()
+	var fingers  := skeleton.get_bone_children(collider.bone_idx)
+	for finger in fingers: total += _get_total_curl(skeleton, finger)
+	return total
+
+static func _get_total_curl(skeleton: Skeleton3D, bone: int, current := 0.0) -> float:
+	current += skeleton.get_bone_pose_rotation(bone).get_euler().x
+	var children := skeleton.get_bone_children(bone)
+	if children.size() == 1:
+		return _get_total_curl(skeleton, children[0], current)
+	else: return current
 
 
 func on_collide(object: RigidBody3D, body: CharacterBody3D) -> void: