public override void Initialize()
        {
            base.Initialize();

            // Build level and tree maps from map_collision.png and map_foliage.png respectively.
            levelMap = GraphicsUtilities.CreateMapScaner("map_level.png");
            treeMap  = GraphicsUtilities.CreateMapScaner("map_trees.png");

            Cave.GoblinCap = 32;

            BuildWorld();

            // Center the camera on the hero spawn point.
            var startPosition = DefaultSpawnCGPoint;

            CenterWorld(startPosition);
        }