API reference

IsdkSystem Class

Extends SystemBase
 Modifiers: final
The IsdkSystem class is responsible for managing and executing the core interaction logic within the ISDK framework. Each frame, it will:
  • Updates the Isdk component properties from Spatial SDK toolkit equivalents
  • Execute interaction logic
  • Emit pointer events to the scene.
  • Generate input events from PointerEvents, and emit them to the scene.
It also includes methods to enable debug tools, register for pointer events, and query for additional meta data about PointerEvents.

Signature

class IsdkSystem(val api: IsdkSystemNativeApi = IsdkSystemNativeApi()) : SystemBase

Constructors

IsdkSystem ( api )
Signature 
constructor(api: IsdkSystemNativeApi = IsdkSystemNativeApi())
Parameters
api: IsdkSystemNativeApi  The native API that is invoked to execute the core interaction logic.
Returns
IsdkSystem

Properties

active : Boolean
[Get][Set]
Whether this system is currently processing input. When false, execute() returns early and no pointer events are dispatched to panels. The cursor system (if present) will also be disabled.
Can be used to temporarily disable panel input, for example when overlay controls are hidden during immersive playback.
Signature 
var active: Boolean
api : IsdkSystemNativeApi
[Get]
The native API that is invoked to execute the core interaction logic.
Signature 
val api: IsdkSystemNativeApi
debugToolsEnabled : Boolean
[Get][Set]
Toggles visibility of debug geometry rendering by ISDK, which shows internal state of interactions. Debug visuals have significant performance cost, so this should only be enabled when debugging.
Signature 
var debugToolsEnabled: Boolean
executeCount : Long
[Get]
The number of times this system's SystemBase.execute method has been called by the system manager. Incremented automatically before each execution cycle. Useful for performance monitoring.
@Volatile guarantees atomic 64-bit reads + happens-before semantics so the introspection reader (which runs on the dump caller's thread) observes a consistent value. Only SystemBase.incrementExecuteCount writes this field, so the non-atomic read-modify-write is safe.
Signature 
var executeCount: Long
systemManager : SystemManager
[Get][Set]
The SystemManager that this system is registered with. Provides access to other systems and the scene. Initialized during system registration.
Signature 
lateinit var systemManager: SystemManager
transformersEnabled : Boolean
[Get][Set]
Enables or disables transformers functionality in ISDK. When enabled, grabbed objects will move according to the behavior defined on the IsdkGrabbable/IsdkGrabConstraint components. When disabled, pointer events will still be emitted; but no transform will take place.
Signature 
var transformersEnabled: Boolean

Methods

associateSystemManager ( systemManager )
Associates this system with a SystemManager. Called during registration. Throws RuntimeException if the system is already associated — each system instance can only belong to one manager.
Signature 
fun associateSystemManager(systemManager: SystemManager)
Parameters
systemManager: SystemManager  The system manager that will own and execute this system.
clearInteractableObservers ( entity )
Removes all observers for a specific entity, effectively stopping all pointer event notifications for that entity.
Signature 
fun clearInteractableObservers(entity: Entity)
Parameters
entity: Entity  The entity to clear all observers for
delete ( entity )
Called when an IsdkSystem.delete is removed from the scene. Override to clean up any per-entity state this system maintains, such as cached components, tracking maps, or native resource handles.
Signature 
open override fun delete(entity: Entity)
Parameters
entity: Entity
destroy ()
Called during system shutdown to release all resources held by this system. Override to dispose of native handles, close streams, and clear any global state accumulated during the session. Subclasses must call super.destroy() so the framework can clean up auto-registered introspection nodes.
Signature 
open override fun destroy()
enableDebugTools ( enable )
DeprecatedThis method is deprecated and will be removed in a future release. Use debugToolsEnabled field instead.
Signature 
fun enableDebugTools(enable: Boolean)
Parameters
enable: Boolean
equals ( other )
Checks if this system is equal to another object. Two systems are considered equal if they are the same instance or share the same Kotlin class, regardless of configuration state.
Signature 
open operator override fun equals(other: Any?): Boolean
Parameters
other: Any?  The object to compare with.
Returns
Boolean  True if the other object is the same system instance or the same system class.
execute ()
Called each frame by the SystemManager to perform this system's per-tick logic. Override to query entities with relevant components and apply updates.
Signature 
open override fun execute()
getDependencies ()
Returns the execution ordering dependencies for this system. Override to declare which other systems must run before or after this one using SystemDependencies.
Signature 
open override fun getDependencies(): SystemDependencies?
Returns
SystemDependencies?  The dependency configuration, or null if this system has no ordering constraints.
getEventDecoratorId ( decoratorName )
Signature 
fun getEventDecoratorId(decoratorName: String): Long
Parameters
decoratorName: String
Returns
Long
getEventDecoratorValueLong ( pointerEvent , decoratorId )
Signature 
fun getEventDecoratorValueLong(pointerEvent: PointerEvent, decoratorId: Long): Long?
Parameters
pointerEvent: PointerEvent
decoratorId: Long
Returns
Long?
getHandForPointerEvent ( pointerEvent )
Signature 
fun getHandForPointerEvent(pointerEvent: PointerEvent): Hand?
Parameters
pointerEvent: PointerEvent
Returns
Hand?
getInteractionEventSourceBehavior ( pointerEvent )
Signature 
fun getInteractionEventSourceBehavior(pointerEvent: PointerEvent): InteractionEventSourceBehavior?
Parameters
pointerEvent: PointerEvent
Returns
InteractionEventSourceBehavior?
getScene ()
Returns the Scene that this system operates within. Delegates to the associated SystemManager to retrieve the active scene instance.
Signature 
fun getScene(): Scene
Returns
Scene  The scene containing the entities and rendering state for this system.
getScenePointerDistance ()
Gets the current maximum distance for scene pointer interactions in meters.
Signature 
fun getScenePointerDistance(): Float
Returns
Float  The current maximum distance in meters
hashCode ()
Returns the hash code of this system, based on its Kotlin class identity. Consistent with the SystemBase.equals implementation — systems of the same class produce the same hash code.
Signature 
open override fun hashCode(): Int
Returns
Int  The hash code derived from this system's Kotlin class.
notifyObservers ( event )
Signature 
fun notifyObservers(event: PointerEvent)
Parameters
event: PointerEvent
registerExternalControllerInputHandler ( handler )
Register an ExternalControllerInputHandler instance, which is used to integrate ISDK with other systems that may be using the controllers. Can be used to disable ISDK input handling if the controllers are in use by another system.
Signature 
fun registerExternalControllerInputHandler(handler: ExternalControllerInputHandler)
Parameters
handler: ExternalControllerInputHandler
registerInteractableObserver ( entity , observer )
Registers an observer to receive pointer events for a specific interactable entity. The observer will be called whenever a pointer event occurs on the specified entity.
Signature 
fun registerInteractableObserver(entity: Entity, observer: (PointerEvent) -> Unit): IsdkSystem.InteractableObserverHandle
Parameters
entity: Entity  The entity to observe pointer events for
observer: Function1  The callback function to invoke when pointer events occur on the entity
Returns
IsdkSystem.InteractableObserverHandle  A handle that can be used to unregister this specific observer
registerObserver ( observer )
Signature 
fun registerObserver(observer: (PointerEvent) -> Unit)
Parameters
observer: Function1
setPanelCollisionPriority ( entity , priority )
Sets the collision priority for a panel identified by entity.
Higher priority values will win collision resolution when panels overlap at the same depth. This should be called after setting the layer zIndex to synchronize the ISDK collision system with the rendering layer order.
Signature 
fun setPanelCollisionPriority(entity: Entity, priority: Float)
Parameters
entity: Entity  The panel entity
priority: Float  The collision priority (typically the layer's zIndex value)
setScenePointerDistance ( distance )
Sets the maximum distance for scene pointer interactions in meters. This controls how far from scene objects ray-based interactions can detect collisions.
Signature 
fun setScenePointerDistance(distance: Float)
Parameters
distance: Float  The maximum distance in meters (must be positive)
unregisterExternalControllerInputHandler ( handler )
Unregister a previously registered ExternalControllerInputHandler instance
Signature 
fun unregisterExternalControllerInputHandler(handler: ExternalControllerInputHandler)
Parameters
handler: ExternalControllerInputHandler
unregisterInteractableObserver ( handle )
Unregisters a specific observer using its handle.
Signature 
fun unregisterInteractableObserver(handle: IsdkSystem.InteractableObserverHandle)
Parameters
handle: IsdkSystem.InteractableObserverHandle  The handle returned from registerInteractableObserver
unregisterObserver ( observer )
Signature 
fun unregisterObserver(observer: (PointerEvent) -> Unit)
Parameters
observer: Function1

Inner Class

InteractableObserverHandle Class

Modifiers: final
Handle for managing interactable observer registrations

Signature

data class InteractableObserverHandle(val id: Long, val entityId: Long)

Constructors

InteractableObserverHandle ( id , entityId )
Signature 
constructor(id: Long, entityId: Long)
Parameters
id: Long
entityId: Long
Returns
IsdkSystem.InteractableObserverHandle

Properties

entityId : Long
[Get]
Signature 
val entityId: Long
id : Long
[Get]
Signature 
val id: Long
Nav Logo
Virtual reality / Meta Horizon
Virtual reality / Meta Horizon
Virtual reality / Meta Horizon
English (US)
© 2026 Meta