enemies no longer spawn on screen

levels/enemy_spawner.gd

@@ -5,6 +5,7 @@ var points: Array[Vector3]
 
 const MAX_ENEMIES := 30
 const MAX_CACHED_POINTS := 100
+const SCREEN_RECT := Rect2(0, 0, 1152, 648)
 var doomed_point_idx := 0
 
 @export var enemy_scenes: Array[EnemyEntry]
@@ -60,23 +61,37 @@ func _process(_delta: float) -> void:
 			doomed_point_idx += 1
 			doomed_point_idx = doomed_point_idx % MAX_CACHED_POINTS
 
+func get_random_point() -> Vector3:
+	var camera = get_viewport().get_camera_3d()
+
+	while not points.is_empty():
+		var idx := randi_range(0, points.size() - 1)
+		var point = points[idx]
+		var screen_pos = camera.unproject_position(point)
+
+		points.remove_at(idx)
+		if not SCREEN_RECT.has_point(screen_pos):
+			return point
+	
+	return Vector3.ZERO
+
 func _on_timer_timeout() -> void:
 	if not Level.is_active(): return
 
 	money += 2.
 	if randf() > .1: return
 
-	if points.is_empty(): 
-		push_warning("tried to spawn enemy, but can't find a point!")
-		return
-
 	while money > 3.:
 		var entry: EnemyEntry = enemy_scenes.pick_random()
 		if entry.cost > money:
 			return
 		var scene := entry.scene
 
-		var pos: Vector3 = points.pick_random()
+		var pos: Vector3 = get_random_point()
+		if points.is_empty(): 
+			push_warning("tried to spawn enemy, but can't find a point!")
+			return
+
 		pos += Vector3.UP * 0.02
 		var car: Node3D = scene.instantiate()
 		car.position = pos