Skip to content

World

World is a collection of functions for finding objects in the world.

Class Functions

Class Function Name Return Type Description Tags
World.GetRootObject() CoreObject Returns the root of the CoreObject hierarchy. None
World.FindObjectsByName(string name) Array<CoreObject> Returns a table containing all the objects in the hierarchy with a matching name. If none match, an empty table is returned. None
World.FindObjectsByType(string typeName) Array<CoreObject> Returns a table containing all the objects in the hierarchy whose type is or extends the specified type. If none match, an empty table is returned. None
World.FindObjectByName(string typeName) CoreObject Returns the first object found with a matching name. In none match, nil is returned. None
World.FindObjectById(string muid) CoreObject Returns the object with a given MUID. Returns nil if no object has this ID. None
World.SpawnAsset(string assetId, [table parameters]) CoreObject Spawns an instance of an asset into the world. Optional parameters can specify a parent for the spawned object. Supported parameters include: parent (CoreObject)
If provided, the spawned asset will be a child of this parent, and any Transform parameters are relative to the parent's Transform; position (Vector3): Position of the spawned object; rotation (Rotation or Quaternion): Rotation of the spawned object; scale (Vector3): Scale of the spawned object.		 None
World.Raycast(Vector3 rayStart, Vector3 rayEnd, [table parameters]) HitResult Traces a ray from rayStart to rayEnd, returning a HitResult with data about the impact point and object. Returns nil if no intersection is found.
Optional parameters can be provided to control the results of the Raycast: ignoreTeams (integer or Array<integer>): Don't return any players belonging to the team or teams listed; ignorePlayers (Player, Array<Player>, or boolean): Ignore any of the players listed. If true, ignore all players.		 None

Examples

Example using:

FindObjectById

Finds an object in the hierarchy based on it's unique ID. To find an object's ID, right-click them in the hierarchy and select "Copy MUID". An object's ID can also be obtained at runtime through the id property. In this example we search for the default sky folder and print a warning if we find it.

local objectId = "8AD92A81CCE73D72:Default Sky"
local defaultSkyFolder = World.FindObjectById(objectId)
if defaultSkyFolder then
    warn(" The default sky is pretty good, but customizing the sky has a huge impact on your game's mood!")
end

See also: CoreLua.warn

Example using:

FindObjectByName

Returns only one object with the given name. This example searches the entire hierarchy for the default floor object and prints a warning if it's found.

local floorObject = World.FindObjectByName("Default Floor")
-- Protect against error if the floor is missing from the game
if floorObject then
    warn(" Don't forget to replace the default floor with something better!")
end

See also: CoreLua.warn

Example using:

FindObjectsByName

This example counts all the spawn points in the game for teams 1, 2 and 3, then prints how many belong to each team.

local team1Count = 0
local team2Count = 0
local team3Count = 0
local allSpawnPoints = World.FindObjectsByName("Spawn Point")

for _, point in ipairs(allSpawnPoints) do
    if point.team == 1 then
        team1Count = team1Count + 1

    elseif point.team == 2 then
        team2Count = team2Count + 1

    elseif point.team == 3 then
        team3Count = team3Count + 1
    end
end

print("Team 1 has " .. team1Count .. " spawn points.")
print("Team 2 has " .. team2Count .. " spawn points.")
print("Team 3 has " .. team3Count .. " spawn points.")

See also: PlayerStart.team | CoreLua.print

Example using:

FindObjectsByType

This example searches the hierarchy for all UI Containers and hides them when the player presses the 'U' key. Useful when capturing video! For this to work, setup the script in a Client context.

function OnBindingPressed(player, binding)
    if binding == "ability_extra_26" then
        local containers = World.FindObjectsByType("UIContainer")
        for _, c in pairs(containers) do
            c.visibility = Visibility.FORCE_OFF
        end
    end
end

function OnPlayerJoined(player)
    player.bindingPressedEvent:Connect(OnBindingPressed)
end

Game.playerJoinedEvent:Connect(OnPlayerJoined)

See also: CoreObject.visibility | Player.bindingPressedEvent | Game.playerJoinedEvent | Event.Connect

Example using:

GetRootObject

There is a parent CoreObject for the entire hierarchy. Although not visible in the user interface, it's accessible with the World.GetRootObject() class function. This example walks the whole hierarchy tree (depth first) and prints the name+type of each Core Object.

function PrintAllNames(node)
    for _, child in ipairs(node:GetChildren()) do
        print(child.name .. " + " .. child.type)
        PrintAllNames(child)
    end
end

local worldRoot = World.GetRootObject()
PrintAllNames(worldRoot)

See also: CoreObject.GetChildren | Other.type

Example using:

Raycast

This example causes all players in the game to fly when they step off a ledge or jump. It does thy by using the Raycast() function to measure each player's distance to the ground below them.

local GROUND_DISTANCE = script:GetCustomProperty("GroundDistance") or 200
local downV = Vector3.New(0, 0, -GROUND_DISTANCE - 103)

function Tick()
    for _, player in pairs(Game.GetPlayers()) do
        local playerPos = player:GetWorldPosition()
        local hitResult = World.Raycast(playerPos, playerPos + downV, {ignorePlayers = true})

        if (player.isFlying and hitResult) then
            player:ActivateWalking()

        elseif (not player.isFlying and not hitResult) then
            player:ActivateFlying()
        end
    end
    Task.Wait(0.1)
end

See also: HitResult.GetImpactPosition | CoreObject.GetCustomProperty | Game.GetPlayers | Player.GetWorldPosition | Vector3.New | CoreLua.Tick | Task.Wait

Example using:

SpawnAsset

In this example, whenever a player dies, an explosion VFX template is spawned in their place and their body is flown upwards. The SpawnAsset() function also returns a reference to the new object, which allows us to do any number of adjustments to it--in this case a custom life span. This example assumes an explosion template exists in the project and it was added as a custom property onto the script object.

local EXPLOSION_TEMPLATE = script:GetCustomProperty("ExplosionVFX")

function OnPlayerDied(player, dmg)
    local playerPos = player:GetWorldPosition()
    local explosionObject = World.SpawnAsset(EXPLOSION_TEMPLATE, {position = playerPos})
    explosionObject.lifeSpan = 3

    player:AddImpulse(Vector3.UP * 1000 * player.mass)
end

function OnPlayerJoined(player)
    player.diedEvent:Connect(OnPlayerDied)
end

Game.playerJoinedEvent:Connect(OnPlayerJoined)

See also: CoreObject.Destroy | Player.GetWorldPosition | Game.playerJoinedEvent | Vector3.UP | Event.Connect

Example using:

SpawnAsset

The function World.SpawnAsset() also supports spawning non-template assets, such as a UI Image or Script. In this example, the Alien icon is set as a custom property of the script. The script is placed as a child of a UI Container. The script spawns the image as a child of the container and aligns it to the center of the screen.

local UI_CONTAINER = script.parent
local UI_IMAGE = script:GetCustomProperty("Alien")

local image = World.SpawnAsset(UI_IMAGE, {parent = UI_CONTAINER})
image.anchor = UIPivot.MIDDLE_CENTER
image.dock = UIPivot.MIDDLE_CENTER

See also: UIControl.anchor | CoreObject.GetCustomProperty

Last update: June 14, 2021