From b262d5d194036571d0b3adad3c9914ba9dbe0c8b Mon Sep 17 00:00:00 2001
From: Lucas Fryzek <lucas.fryzek@fryzekconcepts.com>
Date: Mon, 23 Sep 2024 19:24:56 +0100
Subject: enemy: Add line of sight to AI to look for player

---
 scripts/enemy.gd | 86 +++++++++++++++++++++-----------------------------------
 1 file changed, 32 insertions(+), 54 deletions(-)

(limited to 'scripts/enemy.gd')

diff --git a/scripts/enemy.gd b/scripts/enemy.gd
index 7060ab2..871145b 100644
--- a/scripts/enemy.gd
+++ b/scripts/enemy.gd
@@ -13,15 +13,13 @@ extends CharacterBody3D
 
 @onready var nav_agent: NavigationAgent3D = $NavigationAgent3D
 
-var has_astar: bool = false
-var astar: AStar3D
-var tar_vec: Vector3
 var gravity : float = ProjectSettings.get_setting("physics/3d/default_gravity")
 
 var original_material: StandardMaterial3D
 @onready var red_material = preload("res://models/red_material.tres")
 
 var mesh_ready = false
+var found = false
 
 func _ready() -> void:
 	if gravity_enabled:
@@ -33,22 +31,6 @@ func _ready() -> void:
 func map_changed(_rid):
 	print("Map changed")
 	mesh_ready = true
-
-func chase_target(delta: float) -> void:
-	var target_pos = target.position
-	var direction = (target_pos - position).normalized()
-	
-	if direction:
-		velocity.x = direction.x * speed
-		velocity.z = direction.z * speed
-	else:
-		velocity.x = move_toward(velocity.x, 0, speed)
-		velocity.z = move_toward(velocity.z, 0, speed)
-	
-	if not is_on_floor() and gravity_enabled:
-		velocity.y -= gravity * delta
-		
-	move_and_slide()
 	
 func update_target_location(target_location: Vector3):
 	nav_agent.target_position = target_location
@@ -77,58 +59,54 @@ func chase_nav_mesh(delta: float):
 		velocity.y = 0
 	
 	move_and_slide()
+	
+func wander() -> void:
+	pass
 
 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 target != null and not found and check_target_visible():
+		found = true
+		print("Found player")
 		
-	if not has_astar:
-		# Just try to chase player directly
-		chase_target(delta)
-		return
-		
-	var target_pos = target.position
-	var closest_me = astar.get_closest_point(position)
-	var closest_target = astar.get_closest_point(target_pos)
-	
-	var direction: Vector3
-	if closest_me == closest_target:
-		direction = (target_pos - position).normalized()
-	else:
-		var target_path = astar.get_point_path(closest_me, closest_target)
-		if len(target_path) >= 2:
-			direction = (target_path[1] - position).normalized()
+	if not found:
+		wander()
+	elif found:
+		chase_nav_mesh(delta)
 
-	if direction:
-		#velocity.x = move_toward(velocity.x, direction.x * speed, 10.0 * delta)
-		#velocity.z = move_toward(velocity.z, direction.z * speed, 10.0 * delta)
-		velocity.x = direction.x * speed
-		velocity.z = direction.z * speed
-	else:
-		velocity.x = move_toward(velocity.x, 0, speed)
-		velocity.z = move_toward(velocity.z, 0, speed)
+func check_target_visible() -> bool:
+	var space_state = get_world_3d().direct_space_state
+	var starting_pos = global_position
+	var ending_pos = target.global_position + Vector3.UP
+	var query = PhysicsRayQueryParameters3D.create(starting_pos, ending_pos, 0x3, [self.get_rid()])
+	var result = space_state.intersect_ray(query)
+	
+	print("Checking player")
+	if result:
+		print("Hit ", result.collider, " Target ", target, " Self ", self)
+	
+	if result and result.collider == target:
+		return true
 
-	move_and_slide()
+	return false
 
 func on_hit(_hit_position: Vector3) -> void:
 	if $HitTimer.is_stopped():
 		$MeshInstance3D.set_surface_override_material(0, red_material)
 		$HitTimer.start()
 
-func _on_level_generator_astar_created(in_astar: AStar3D) -> void:
-	astar = in_astar
-	has_astar = true
-
 func _on_hit_timer_timeout() -> void:
 	$MeshInstance3D.set_surface_override_material(0, original_material)
 	$HitTimer.stop()
 	
 	get_parent().remove_child(self)
 	queue_free()
+
+func _on_body_entered(body: Node3D) -> void:
+	target = body
+
+func _on_body_exited(body: Node3D) -> void:
+	if body == target and not found:
+		target = null
-- 
cgit