Add NodeGroupNotifier to generalize PathNavigator

The NodeGroupNotifier notifies nodes within a specific group of the
existence of a specific Node. With this new node, the Navigation does
not need to be specifically assigned to the
PathNavigatorForKinematicBody, making it easier to use in different
scenarios.

Characters/Util/PathNavigatorForKinematicBody.gd

@@ -2,21 +2,35 @@ extends Path
 
 var _current_nav_path: PoolVector3Array
 
-var _current_nav_index = 0
-var _current_path_index = 1
+var _current_nav_index
+var _current_path_index
 
 var _arrived_distance_threshold = 0.1
 
 export(float) var speed = 8
-export(NodePath) var navigation_nodepath
 export(NodePath) var body_nodepath
 
 var navigation: Navigation
 var body: KinematicBody
 
 
+# React to the NodeGroupNotifier of the Navigation
+func set_navigator_node(navigation_node: Navigation):
+	navigation = navigation_node as Navigation
+	
+	# Our path could change significantly with the Navigation node, so restart
+	_restart_navigation()
+
+
 func _ready():
-	navigation = get_node(navigation_nodepath) as Navigation
+	_restart_navigation()
+
+
+# Reset the body to the starting position and start the navigation freshly
+func _restart_navigation():
+	_current_nav_index = 0
+	_current_path_index = 1
+	
 	body = get_node(body_nodepath) as KinematicBody
 
 	# Initialize the position
@@ -67,7 +81,11 @@ func _get_new_navigation():
 	_current_nav_index = 0
 	
 	var goal = curve.get_point_position(_current_path_index)
-	_current_nav_path = navigation.get_simple_path(_get_body_position(), goal)
+	
+	if navigation:
+		_current_nav_path = navigation.get_simple_path(_get_body_position(), goal)
+	else:
+		_current_nav_path = PoolVector3Array([goal])
 
 
 # Return the current position of the body we're controlling

Characters/Util/PathNavigatorForKinematicBody.tscn

@@ -2,14 +2,15 @@
 
 [ext_resource path="res://Characters/Util/PathNavigatorForKinematicBody.gd" type="Script" id=1]
 
-[sub_resource type="Curve3D" id=4]
+[sub_resource type="Curve3D" id=1]
 _data = {
 "points": PoolVector3Array( 0, 0, 0, 0, 0, 0, -7.92509, 2.86102e-05, -6.86376, 0, 0, 0, 0, 0, 0, 0.703341, 0.398803, 1.99739, 0, 0, 0, 0, 0, 0, 9.39952, 0.263628, 7.15156, 0, 0, 0, 0, 0, 0, -4.38803, 1.73835, 6.52798 ),
 "tilts": PoolRealArray( 0, 0, 0, 0 )
 }
 
-[node name="PathNavigatorForKinematicBody" type="Path"]
-curve = SubResource( 4 )
+[node name="PathNavigatorForKinematicBody" type="Path" groups=[
+"Navigator",
+]]
+curve = SubResource( 1 )
 script = ExtResource( 1 )
-navigation_nodepath = NodePath("..")
 body_nodepath = NodePath("../KinematicBody")

Level/PathTestWorld.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=6 format=2]
+[gd_scene load_steps=7 format=2]
 
 [ext_resource path="res://Characters/Util/PathNavigatorForKinematicBody.tscn" type="PackedScene" id=1]
 [ext_resource path="res://Characters/Meldewesen/Meldewesen.tscn" type="PackedScene" id=2]
+[ext_resource path="res://Util/NodeGroupNotifier.tscn" type="PackedScene" id=3]
 
 [sub_resource type="NavigationMesh" id=1]
 vertices = PoolVector3Array( -1.3, 0.4, -1.6, 0.200001, 0.4, -1.6, 0.200001, 0.4, -9.4, -9.4, 0.4, -0.0999994, -1.6, 0.4, -0.0999994, -1.3, 0.4, -1.6, 0.200001, 0.4, -9.4, -9.4, 0.4, -9.4, 0.200001, 0.4, -9.4, 0.200001, 0.4, -1.6, 1.4, 0.4, -1.6, 1.4, 0.4, -1.6, 1.7, 0.4, -0.0999994, 9.5, 0.4, -0.0999994, 9.5, 0.4, -9.4, 0.200001, 0.4, -9.4, 0.200001, 0.4, 9.5, 0.200001, 0.4, 8.3, -1.6, 0.4, 8, -9.4, 0.4, 9.5, -1.6, 0.4, 5, 0.200001, 0.4, 4.7, 0.200001, 0.4, 1.7, -1.6, 0.4, 1.4, -1.6, 0.4, 5, -1.6, 0.4, 1.4, -9.4, 0.4, -0.0999994, -9.4, 0.4, 9.5, -1.6, 0.4, 1.4, -1.6, 0.4, -0.0999994, -9.4, 0.4, -0.0999994, -9.4, 0.4, 9.5, -1.6, 0.4, 8, -1.6, 0.4, 5, 1.7, 0.4, 8, 0.200001, 0.4, 8.3, 0.200001, 0.4, 9.5, 9.5, 0.4, 9.5, 0.200001, 0.4, 1.7, 0.200001, 0.4, 4.7, 1.7, 0.4, 5, 1.7, 0.4, 1.4, 1.7, 0.4, 5, 9.5, 0.4, 9.5, 9.5, 0.4, -0.0999994, 1.7, 0.4, 1.4, 1.7, 0.4, 5, 1.7, 0.4, 8, 9.5, 0.4, 9.5, 9.5, 0.4, -0.0999994, 1.7, 0.4, -0.0999994, 1.7, 0.4, 1.4 )
@@ -41,3 +42,7 @@ material/0 = null
 body_nodepath = NodePath("Meldewesen")
 
 [node name="Meldewesen" parent="PathNavigatorForKinematicBody" instance=ExtResource( 2 )]
+
+[node name="NodeGroupNotifier" parent="." instance=ExtResource( 3 )]
+group_name = "Navigator"
+node_to_send = NodePath("..")

Util/NodeGroupNotifier.gd

@@ -0,0 +1,31 @@
+tool
+extends Node
+
+
+#
+# Notifies a specific group of the existence of a node which can be assigned to this one.
+# The nodes in the group are notified via the function "set_groupname_node", e.g. "set_notifier_node",
+#  which has the Node as an argument.
+#
+
+
+export(String) var group_name: String
+export(NodePath) var node_to_send: NodePath
+
+
+func _ready():
+	var function_name = "set_%s_node" % [group_name.to_lower()]
+	
+	print("Calling %s" % [function_name])
+	get_tree().call_group(group_name, function_name, get_node(node_to_send))
+
+
+# Display a warning in the editor if the group or node is invalid
+func _get_configuration_warning():
+	if !get_tree().has_group(group_name):
+		return "Group does not exist!"
+	
+	if !node_to_send:
+		return "A node to send needs to be assigned!"
+	
+	return ""

Util/NodeGroupNotifier.tscn

@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Util/NodeGroupNotifier.gd" type="Script" id=1]
+
+[node name="NodeGroupNotifier" type="Node"]
+script = ExtResource( 1 )

default_env.tres

@@ -1,5 +1,7 @@
 [gd_resource type="Environment" load_steps=2 format=2]
+
 [sub_resource type="ProceduralSky" id=1]
+
 [resource]
 background_mode = 2
 background_sky = SubResource( 1 )