Blueprint

A Blueprint Class allows spawning any Unreal Blueprint Actor in HELIX.

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💂Authority

This class can be spawned on both 🟧 Client and 🟦 Server side (if you spawn it on client, it won't be synchronized with other players).

👪Inheritance

This class shares methods and events from Base Entity, Base Actor, Base Paintable.

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tip

If your Actor Blueprint was spawned on the Server, it will be automatically synchronized with other players using the HELIX Network Authority system! It follows the same rules as all other entities!

Examples

Calling Blueprint Events from lua

Client/Index.lua

-- Spawns the Blueprint
local blueprint = Blueprint(Vector(), Rotator(), "my-asset-pack::BP_MyBlueprint")

local param1 = 123
local param2 = "hello there!"

-- Calls the event, passing any parameters
blueprint:CallBlueprintEvent("MyBlueprintCustomEvent", param1, param2)

Binding Blueprint Event Dispatchers

Client/Index.lua

-- Spawns the Blueprint
local blueprint = Blueprint(Vector(), Rotator(), "my-asset-pack::BP_MyBlueprint")

-- Subscribes to a Blueprint Event Dispatcher
blueprint:BindBlueprintEventDispatcher("MyBlueprintDispatcher", function(self, arg1, arg2)
    Console.Log("Called from Blueprint!", arg1, arg2)
end)

Constructors

Default Constructor

local my_blueprint = Blueprint(location?, rotation?, blueprint_asset?)

Type	Name	Default	Description
Vector	location	Vector(0, 0, 0)
Rotator	rotation	Rotator(0, 0, 0)
Blueprint Reference	blueprint_asset

Static Functions

Inherited Entity Static Functions

Base Entityscripting-reference/classes/base-classes/Entity

	Returns	Name	Description
	table of Base Entity	GetAll	Returns a table containing all Entities of the class this is called on
	Base Entity	GetByIndex	Returns a specific Entity of this class at an index
	integer	GetCount	Returns how many Entities of this class exist
	iterator	GetPairs	Returns an iterator with all Entities of this class to be used with pairs()
	table	Inherit	Inherits this class with the Inheriting System
	table of table	GetInheritedClasses	Gets a list of all directly inherited classes from this Class created with the Inheriting System
	table or nil	GetParentClass	Gets the parent class if this Class was created with the Inheriting System
	boolean	IsChildOf	Gets if this Class is child of another class if this Class was created with the Inheriting System
	function	Subscribe	Subscribes to an Event for all entities of this Class
	function	SubscribeRemote	Subscribes to a custom event called from server
		Unsubscribe	Unsubscribes all callbacks from this Event in this Class within this Package, or only the callback passed

This entity doesn't have own static functions.

Functions

Inherited Entity Functions

Base Entityscripting-reference/classes/base-classes/Entity

	Returns	Name	Description
	integer	GetID	Gets the universal network ID of this Entity (same on both client and server)
	table	GetClass	Gets the class of this entity
	boolean	IsA	Recursively checks if this entity is inherited from a Class
	function	Subscribe	Subscribes to an Event on this specific entity
	function	SubscribeRemote	Subscribes to a custom event called from server on this specific entity
		Unsubscribe	Unsubscribes all callbacks from this Event in this Entity within this Package, or only the callback passed
		SetValue	Sets a Value in this Entity
	any	GetValue	Gets a Value stored on this Entity at the given key
		Destroy	Destroys this Entity
	boolean	IsValid	Returns true if this Entity is valid (i.e. wasn't destroyed and points to a valid Entity)
		CallRemoteEvent	Calls a custom remote event directly on this entity to a specific Player
		CallRemoteEvent	Calls a custom remote event directly on this entity
		BroadcastRemoteEvent	Calls a custom remote event directly on this entity to all Players

Inherited Actor Functions

Base Actorscripting-reference/classes/base-classes/Actor

	Returns	Name	Description
		AddImpulse	Applies a force in world world to this Actor
		AttachTo	Attaches this Actor to any other Actor, optionally at a specific bone
		Detach	Detaches this Actor from AttachedTo Actor
		SetCollision	Sets this Actor's collision type
		SetDimension	Sets this Actor's Dimension
		SetForce	Adds a permanent force to this Actor, set to Vector(0, 0, 0) to cancel
		SetGravityEnabled	Sets whether gravity is enabled on this Actor
		SetVisibility	Sets whether the actor is visible or not
		SetHighlightEnabled	Sets whether the highlight is enabled on this Actor, and which highlight index to use
		SetOutlineEnabled	Sets whether the outline is enabled on this Actor, and which outline index to use
		SetLifeSpan	Sets the time (in seconds) before this Actor is destroyed. After this time has passed, the actor will be automatically destroyed.
		SetLocation	Sets this Actor's location in the game world
		SetRotation	Sets this Actor's rotation in the game world
		SetRelativeLocation	Sets this Actor's relative location in local space (only if this actor is attached)
		SetRelativeRotation	Sets this Actor's relative rotation in local space (only if this actor is attached)
		SetScale	Sets this Actor's scale
		SetNetworkAuthority	Sets the Player to have network authority over this Actor
		SetNetworkAuthorityAutoDistributed	Sets if this Actor will auto distribute the network authority between players
		TranslateTo	Smoothly moves this actor to a location over a certain time
		RotateTo	Smoothly rotates this actor to an angle over a certain time
	boolean	IsBeingDestroyed	Returns true if this Actor is being destroyed
	boolean	IsVisible	Returns true if this Actor is visible
	boolean	IsGravityEnabled	Returns true if gravity is enabled on this Actor
	boolean	IsInWater	Returns true if this Actor is in water
	boolean	IsNetworkDistributed	Returns true if this Actor is currently network distributed
	table of Base Actor	GetAttachedEntities	Gets all Actors attached to this Actor
	Base Actor or nil	GetAttachedTo	Gets the Actor this Actor is attached to
	table	GetBounds	Gets this Actor's bounds
	CollisionType	GetCollision	Gets this Actor's collision type
	Vector	GetLocation	Gets this Actor's location in the game world
	Vector	GetRelativeLocation	Gets this Actor's Relative Location if it's attached
	Player or nil	GetNetworkAuthority	Gets this Actor's Network Authority Player
	Rotator	GetRotation	Gets this Actor's angle in the game world
	Rotator	GetRelativeRotation	Gets this Actor's Relative Rotation if it's attached
	Vector	GetForce	Gets this Actor's force (set by SetForce())
	integer	GetDimension	Gets this Actor's dimension
	boolean	HasNetworkAuthority	Returns true if the local Player is currently the Network Authority of this Actor
	boolean	HasAuthority	Gets if this Actor was spawned by the client side
	Vector	GetScale	Gets this Actor's scale
	Vector	GetVelocity	Gets this Actor's current velocity
		AddActorTag	Adds an Unreal Actor Tag to this Actor
		RemoveActorTag	Removes an Unreal Actor Tag from this Actor
	table of string	GetActorTags	Gets all Unreal Actor Tags on this Actor
	boolean	WasRecentlyRendered	Gets if this Actor was recently rendered on screen
	float	GetDistanceFromCamera	Gets the distance of this Actor from the Camera
	float	GetScreenPercentage	Gets the percentage of this Actor size in the screen

Inherited Paintable Functions

Base Paintablescripting-reference/classes/base-classes/Paintable

	Returns	Name	Description
		SetMaterial	Sets the material at the specified index of this Actor
		SetMaterialFromCanvas	Sets the material at the specified index of this Actor to a Canvas object
		SetMaterialFromSceneCapture	Sets the material at the specified index of this Actor to a SceneCapture object
		SetMaterialFromWebUI	Sets the material at the specified index of this Actor to a WebUI object
		ResetMaterial	Resets the material from the specified index to the original one
		SetMaterialColorParameter	Sets a Color parameter in this Actor's material
		SetMaterialScalarParameter	Sets a Scalar parameter in this Actor's material
		SetMaterialTextureParameter	Sets a texture parameter in this Actor's material to an image on disk
		SetMaterialVectorParameter	Sets a Vector parameter in this Actor's material
		SetPhysicalMaterial	Overrides this Actor's Physical Material with a new one

	Returns	Name	Description
	any	CallBlueprintEvent	Calls a Blueprint Event or Function
	function	BindBlueprintEventDispatcher	Assigns and Binds a Blueprint Event Dispatcher
		UnbindBlueprintEventDispatcher	Unbinds a Blueprint Event Dispatcher
		SetBlueprintPropertyValue	Sets a Blueprint Property/Variable value directly
	any	GetBlueprintPropertyValue	Gets a Blueprint Property/Variable value

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CallBlueprintEvent

Calls a Blueprint Event or Function
Returns all Function return values on Client Side

— Returns any (the function return values).

local ret = my_blueprint:CallBlueprintEvent(event_name, arguments...?)

Type	Parameter	Default	Description
string	event_name		Event or Function name
any	arguments...?	nil	Sequence of arguments to pass to the event

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BindBlueprintEventDispatcher

Assigns and Binds a Blueprint Event Dispatcher

— Returns function (the callback itself).

local ret = my_blueprint:BindBlueprintEventDispatcher(dispatcher_name, callback)

Type	Parameter	Default	Description
string	dispatcher_name		Event Dispatcher name
function	callback		Callback function to call (the first argument is the blueprint itself)

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UnbindBlueprintEventDispatcher

Unbinds a Blueprint Event Dispatcher

my_blueprint:UnbindBlueprintEventDispatcher(dispatcher_name, callback?)

Type	Parameter	Default	Description
string	dispatcher_name		Event Dispatcher name
function	callback?		Optional callback to unbind

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SetBlueprintPropertyValue

Sets a Blueprint Property/Variable value directly

my_blueprint:SetBlueprintPropertyValue(property_name, value)

Type	Parameter	Default	Description
string	property_name
any	value

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GetBlueprintPropertyValue

Gets a Blueprint Property/Variable value

— Returns any (the value).

local ret = my_blueprint:GetBlueprintPropertyValue(property_name)

Type	Parameter	Default	Description
string	property_name

Events

Inherited Entity Events

Base Entityscripting-reference/classes/base-classes/Entity

	Name	Description
	Spawn	Triggered when an Entity is spawned/created
	Destroy	Triggered when an Entity is destroyed
	ValueChange	Triggered when an Entity has a value changed with :SetValue()
	ClassRegister	Triggered when a new Class is registered with the Inheriting System

Inherited Actor Events

Base Actorscripting-reference/classes/base-classes/Actor

	Name	Description
	Spawn	Triggered when an Entity is spawned/created
	Destroy	Triggered when an Entity is destroyed
	ValueChange	Triggered when an Entity has a value changed with :SetValue()
	ClassRegister	Triggered when a new Class is registered with the Inheriting System

This entity doesn't have own events.

✅ List of Supported Parameter Types

List of all supported parameters which can be passed between Lua ↔ Blueprint:

Lua Type	Blueprint Type	Lua → BP	BP → Lua
boolean	Boolean	✅	✅
number	Byte	✅	✅
number	Integer	✅	✅
number	Integer64	✅	✅
number	Float	✅	✅
number	Enum	✅	✅
string	String	✅	✅
string	Name	✅	✅
string	Text	✅	✅
Vector2D	Vector2D	✅	✅
Vector	Vector	✅	✅
Rotator	Rotator	✅	✅
Color	Color	✅	✅
Color	LinearColor	✅	✅
StaticMesh	StaticMeshActor	✅	✅
Prop	StaticMeshActor	✅	✅
Weapon	SkeletalMeshActor	✅	✅
Vehicle	WheeledVehiclePawn	✅	✅
Grenade	StaticMeshActor	✅	✅
Melee	StaticMeshActor	✅	✅
Light	Light	✅	✅
Decal	DecalActor	✅	✅
TextRender	WorldText3D	✅	✅
Sound	AmbientSound	✅	✅
Canvas	MaterialInstanceDynamic	✅	❌
WebUI	MaterialInstanceDynamic	✅	❌
SceneCapture	MaterialInstanceDynamic	✅	❌
Blueprint	Actor	✅	✅
Widget	Widget	✅	❌
BaseActor	Actor	✅	✅
Player	PlayerController	✅	❌
SpecialPath	Texture2D	✅	❌
table	Any Struct	✅	✅

Note

It is only possible to pass Actors from Blueprint → Lua if the Actor is a Spawned Entity. It is not possible to pass newly spawned Actors in Blueprints to Lua.

tip

Passing Maps, Arrays and Sets is also supported! As long their keys/values are in the list above.

Any Struct

Custom Structs can also be passed and retrieved, just pass an object with the same properties as the Unreal Struct, examples:

FTransform

{
    ["Translation"] = Vector(),
    ["Rotation"] = Rotator(),
    ["Scale"] = Vector()
}

FMargin

{
    ["Bottom"] = 0.0,
    ["Left"] = 0.0,
    ["Right"] = 0.0,
    ["Top"] = 0.0
}

FVector4

{
    ["W"] = 0.0,
    ["X"] = 0.0,
    ["Y"] = 0.0,
    ["Z"] = 0.0
}