void Start()
{
terrain_manager = terrain_manager_game_object.GetComponent <TerrainManager>();
visibility_corners = GetCorners();
CorrectionCorners(visibility_corners);
Debug.Log("starting visibility");
adjacency_matrix = GetAdjacencyMatrix(visibility_corners);
dominatingSet = GreedyDominatingSet(visibility_corners, adjacency_matrix);
foreach (Vector3 v in dominatingSet)
{
terrain_manager.DrawCircle(v, 5, 2);
}
}