bsp_level_generator: Create navigation mesh

Also make enemy AI use nav mesh for finding player

1 files changed, 44 insertions, 4 deletions

diff --git a/scripts/enemy.gd b/scripts/enemy.gd
index 569905f..6be60c7 100644
--- a/scripts/enemy.gd
+++ b/scripts/enemy.gd
@@ -6,7 +6,12 @@ extends CharacterBody3D
 @export var target: Node3D
 
 ## Whether to use gravity on enemy
-@export var gravity_enabled: bool = false
+@export var gravity_enabled: bool = true
+
+## Use nav mesh or dumb path finding
+@export var use_nav_mesh: bool = true
+
+@onready var nav_agent: NavigationAgent3D = $NavigationAgent3D
 
 var has_astar: bool = false
 var astar: AStar3D
@@ -15,9 +20,17 @@ var gravity : float = ProjectSettings.get_setting("physics/3d/default_gravity")
 
 var original_color: Color
 
+var mesh_ready = false
+
 func _ready() -> void:
 	if gravity_enabled:
 		motion_mode = MotionMode.MOTION_MODE_GROUNDED
+		
+	NavigationServer3D.connect("map_changed", map_changed)
+	
+func map_changed(_rid):
+	print("Map changed")
+	mesh_ready = true
 
 func chase_target(delta: float) -> void:
 	var target_pos = target.position
@@ -34,19 +47,46 @@ func chase_target(delta: float) -> void:
 		velocity.y -= gravity * delta
 		
 	move_and_slide()
+	
+func update_target_location(target_location: Vector3):
+	nav_agent.target_position = target_location
+	
+func chase_nav_mesh(delta: float):
+	if not mesh_ready:
+		return
+		
+	if target != null:
+		update_target_location(target.global_position)
+	
+	var current_location = global_transform.origin
+	var next_location = nav_agent.get_next_path_position()
+	var new_velocity = (next_location - current_location).normalized() * speed
+	
+	# We only want to navigate on XZ plane
+	new_velocity.y = 0
+	
+	velocity = new_velocity
+	
+	if not is_on_floor() and gravity_enabled:
+		velocity.y -= gravity * delta
+	move_and_slide()
 
 func _physics_process(delta: float) -> void:
 	if target == null:
 		return
 		
+	if Input.is_action_pressed("ui_right"):
+		return
+		
+	if use_nav_mesh:
+		chase_nav_mesh(delta)
+		return
+		
 	if not has_astar:
 		# Just try to chase player directly
 		chase_target(delta)
 		return
 		
-	if Input.is_action_pressed("ui_right"):
-		return
-		
 	var target_pos = target.position
 	var closest_me = astar.get_closest_point(position)
 	var closest_target = astar.get_closest_point(target_pos)