add debug example

swarm_engine/flow_field_navigation/flow_field_navigation.gd

@@ -8,4 +8,14 @@ func _ready() -> void:
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta: float) -> void:
-	pass
+	var _time = Time.get_ticks_msec() / 1000.0
+	var box_pos = Vector3(0, sin(_time * 4), 0)
+	var line_begin = Vector3(-1, sin(_time * 4), 0)
+	var line_end = Vector3(1, cos(_time * 4), 0)
+ 
+	DebugDraw3D.draw_box(Vector3.ZERO, Quaternion.IDENTITY, Vector3.ONE * 2, Color.CORNFLOWER_BLUE)
+	DebugDraw3D.draw_arrow(line_begin, line_end, Color(1, 1, 0))
+	DebugDraw2D.set_text("Time", _time)
+	DebugDraw2D.set_text("Frames drawn", Engine.get_frames_drawn())
+	DebugDraw2D.set_text("FPS", Engine.get_frames_per_second())
+	DebugDraw2D.set_text("delta", delta)