VyScript to implement open world warping. When colliding with the map edge, it will automatically warp to the next map. (Vylocity engine: http://vylocity.com/)

open_world_warping.js

#define MAP_NAME_COORD_DELIMITER "_"

Mob/Player
	onBump(pB)
		if (pB == Map.void)
			var warpMap = null
			var warpX = this.xPos;
			var warpY = this.yPos;
			var warpMapCoords = this.get_outside_map_coords(this.mapName)
			
			if (this.xPos == -this.xOrigin) //left
				warpMapCoords.x -= 1;
				warpMap = this.get_outside_map_name(warpMapCoords)
				warpX = Map.getMapSize(warpMap).xPos-this.xOrigin-this.width
			else if (this.yPos == -this.yOrigin) //up
				warpMapCoords.y -= 1;
				warpMap = this.get_outside_map_name(warpMapCoords)
				warpY = Map.getMapSize(warpMap).yPos-this.yOrigin-this.height
			else if (this.xPos == Map.getMapSize(this.mapName).xPos-this.xOrigin-this.width) //right
				warpMapCoords.x += 1;
				warpMap = this.get_outside_map_name(warpMapCoords)
				warpX = -this.xOrigin
			else //down
				warpMapCoords.y += 1;
				warpMap = this.get_outside_map_name(warpMapCoords)
				warpY = -this.yOrigin
			
			if (warpMap != null)
				this.setPos(warpX, warpY, warpMap)
			
	function get_outside_map_coords(mapName)
		var pathComponents = mapName.split("/")
		mapName = pathComponents[pathComponents.length-1]
		
		var components = mapName.split(MAP_NAME_COORD_DELIMITER)
		return {'x':Util.parseInt(components[0]), 'y':Util.parseInt(components[1])}
	
	function get_outside_map_name(coords)
		return this.get_outside_map_name_2(coords.x, coords.y)
		
	function get_outside_map_name_2(x, y)
		var mapName = x+MAP_NAME_COORD_DELIMITER+y
		return Map.getMapSize(mapName).x>0 ? mapName : null

This script assumes you have maps named with the following syntax: "X_Y"
Example of a world with 9 maps connected:

1. "-1_-1" = (top-left map)
2. "-1_0" = (middle-left map)
3. "-1_1" = (bottom-left map)
4. "0_-1" = (top-center map)
5. "0_0" = (middle-center map)
6. "0_1" = (bottom-center map)
7. "1_-1" = (top-right map)
8. "1_0" = (middle-right map)
9. "1_1" = (bottom-right map)