Class WebXRImageTracking

gameObject

guid

OptionalsourceId

activeAndEnabled

• get activeAndEnabled(): boolean

• Returns boolean

  true if the object is enabled and active in the hierarchy

context

• get context(): Context

• Use the context to get access to many Needle Engine features and use physics, timing, access the camera or scene

  Returns Context
• set context(context): void

• Parameters

  • context: Context

  Returns void

destroyed

• get destroyed(): boolean

• Returns boolean

  true if this component was destroyed (this.destroy()) or the whole object this component was part of

enabled

• get enabled(): boolean

• Returns boolean

• set enabled(val): void

• Parameters

  • val: boolean

  Returns void

forward

• get forward(): Vector3

• Forward (0,0,-1) vector in world space

  Returns Vector3

hideFlags

• get hideFlags(): HideFlags

• Returns HideFlags

layer

• get layer(): number

• Returns number

  the layer of the gameObject this component is attached to

name

• get name(): string

• Returns string

  the name of the gameObject this component is attached to
• set name(str): void

• Parameters

  • str: string

  Returns void

right

• get right(): Vector3

• Right (1,0,0) vector in world space

  Returns Vector3

scene

• get scene(): Scene

• shorthand for this.context.scene

  Returns Scene

  the scene of the context

static

• get static(): boolean

• Is the gameObject marked as static

  Returns boolean
• set static(value): void

• Parameters

  • value: boolean

  Returns void

tag

• get tag(): string

• Returns string

  the tag of the gameObject this component is attached to
• set tag(str): void

• Parameters

  • str: string

  Returns void

up

• get up(): Vector3

• Up (0,1,0) vector in world space

  Returns Vector3

worldEuler

• get worldEuler(): Euler

• Returns Euler

• set worldEuler(val): void

• Parameters

  • val: Euler

  Returns void

worldPosition

• get worldPosition(): Vector3

• Returns Vector3

• set worldPosition(val): void

• Parameters

  • val: Vector3

  Returns void

worldQuaternion

• get worldQuaternion(): Quaternion

• Returns Quaternion

• set worldQuaternion(val): void

• Parameters

  • val: Quaternion

  Returns void

worldRotation

• get worldRotation(): Vector3

• Returns Vector3

• set worldRotation(val): void

• Parameters

  • val: Vector3

  Returns void

addEventListener

• addEventListener<T>(type, listener): void

• Appends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.

  The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.

  When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.

  When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.

  When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.

  If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.

  The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture.

  MDN Reference

  Type Parameters

  • T extends Event

  Parameters

  • type: string
  • listener: ((evt: T) => any)
    • • (evt): any

      • Parameters

        • evt: T

        Returns any

  Returns void

destroy

• destroy(): void

• Destroys this component (and removes it from the object)

  Returns void

dispatchEvent

• dispatchEvent(evt): boolean

• Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.

  MDN Reference

  Parameters

  • evt: Event

  Returns boolean

OptionalearlyUpdate

• earlyUpdate(): void

• first callback in a frame (called every frame when implemented)

  Returns void

OptionallateUpdate

• lateUpdate(): void

• late callback in a frame (called every frame when implemented)

  Returns void

OptionalonAfterRender

• onAfterRender(): void

• called after the scene was rendered

  Returns void

OptionalonBeforeRender

• onBeforeRender(frame): void

• called before the scene gets rendered in the main update loop

  Parameters

  • frame: null | XRFrame

  Returns void

OptionalonCollisionEnter

• onCollisionEnter(col): any

• Parameters

  • col: Collision

  Returns any

OptionalonCollisionExit

• onCollisionExit(col): any

• Parameters

  • col: Collision

  Returns any

OptionalonCollisionStay

• onCollisionStay(col): any

• Parameters

  • col: Collision

  Returns any

onDestroy

• onDestroy(): void

• Called when the component gets destroyed

  Returns void

onDisable

• onDisable(): void

• called every time the component gets disabled or if a parent object (or this.gameObject) gets set to invisible

  Returns void

onEnable

• onEnable(): void

• called every time when the component gets enabled (this is invoked after awake and before start)
  or when it becomes active in the hierarchy (e.g. if a parent object or this.gameObject gets set to visible)

  Returns void

OptionalonPausedChanged

• onPausedChanged(isPaused, wasPaused): void

• Called for all scripts when the context gets paused or unpaused

  Parameters

  • isPaused: boolean
  • wasPaused: boolean

  Returns void

OptionalonPointerClick

• onPointerClick(args): any

• Called when an object (or any child object) is clicked (needs a EventSystem in the scene)

  Parameters

  • args: PointerEventData

  Returns any

OptionalonPointerDown

• onPointerDown(args): any

• Called when a button is started to being pressed on an object (or a child object)

  Parameters

  • args: PointerEventData

  Returns any

OptionalonPointerEnter

• onPointerEnter(args): any

• Called when a pointer (mouse, touch, xr controller) starts pointing on/hovering an object (or a child object)

  Parameters

  • args: PointerEventData

  Returns any

OptionalonPointerExit

• onPointerExit(args): any

• Called when a pointer (mouse, touch, xr controller) exists an object (it was hovering the object before but now it's not anymore)

  Parameters

  • args: PointerEventData

  Returns any

OptionalonPointerMove

• onPointerMove(args): any

• Called when a pointer (mouse, touch, xr controller) is moving over an object (or a child object)

  Parameters

  • args: PointerEventData

  Returns any

OptionalonPointerUp

• onPointerUp(args): any

• Called when a button is released (which was previously pressed in onPointerDown)

  Parameters

  • args: PointerEventData

  Returns any

OptionalonTriggerEnter

• onTriggerEnter(col): any

• Parameters

  • col: ICollider

  Returns any

OptionalonTriggerExit

• onTriggerExit(col): any

• Parameters

  • col: ICollider

  Returns any

OptionalonTriggerStay

• onTriggerStay(col): any

• Parameters

  • col: ICollider

  Returns any

OptionalonValidate

• onValidate(prop?): void

• called when you decorate fields with the @validate() decorator

  Parameters

  • Optionalprop: string

    the name of the field that was changed

  Returns void

OptionalonXRControllerAdded

• onXRControllerAdded(args): void

• Callback when a controller is connected/added while in a XR session
  OR when the component joins a running XR session that has already connected controllers
  OR when the component becomes active during a running XR session that has already connected controllers

  Parameters

  • args: NeedleXRControllerEventArgs

  Returns void

OptionalonXRControllerRemoved

• onXRControllerRemoved(args): void

• callback when a controller is removed while in a XR session
  OR when the component becomes inactive during a running XR session

  Parameters

  • args: NeedleXRControllerEventArgs

  Returns void

removeEventListener

• removeEventListener<T>(type, listener): void

• Removes the event listener in target's event listener list with the same type, callback, and options.

  MDN Reference

  Type Parameters

  • T extends Event

  Parameters

  • type: string
  • listener: ((arg: T) => any)
    • • (arg): any

      • Parameters

        • arg: T

        Returns any

  Returns void

OptionalresolveGuids

• resolveGuids(guidsMap): void

• called on a component with a map of old to new guids (e.g. when instantiate generated new guids and e.g. timeline track bindings needs to remape them)

  Parameters

  • guidsMap: GuidsMap

  Returns void

setWorldPosition

• setWorldPosition(x, y, z): void

• Parameters

  • x: number
  • y: number
  • z: number

  Returns void

setWorldQuaternion

• setWorldQuaternion(x, y, z, w): void

• Parameters

  • x: number
  • y: number
  • z: number
  • w: number

  Returns void

setWorldRotation

• setWorldRotation(x, y, z, degrees?): void

• Parameters

  • x: number
  • y: number
  • z: number
  • degrees: boolean = true

  Returns void

Optionalstart

• start(): void

• called at the beginning of a frame (once per component)

  Returns void

startCoroutine

• startCoroutine(routine, evt?): Generator<unknown, any, unknown>

• starts a coroutine (javascript generator function)
  yield will wait for the next frame:

  • Use yield WaitForSeconds(1) to wait for 1 second.
  • Use yield WaitForFrames(10) to wait for 10 frames.
  • Use yield new Promise(...) to wait for a promise to resolve.

  Parameters

  • routine: Generator<unknown, any, unknown>

    generator function to start
  • evt: FrameEvent = FrameEvent.Update

    event to register the coroutine for (default: FrameEvent.Update). Note that all coroutine FrameEvent callbacks are invoked after the matching regular component callbacks. For example FrameEvent.Update will be called after regular component update() methods)

  Returns Generator<unknown, any, unknown>

  the generator function (use it to stop the coroutine with stopCoroutine)

  Example

  onEnable() { this.startCoroutine(this.myCoroutine()); }
  private *myCoroutine() {
     while(this.activeAndEnabled) {
        console.log("Hello World", this.context.time.frame);
        // wait for 5 frames
        for(let i = 0; i < 5; i++) yield;
     }
  }
  Copy

stopCoroutine

• stopCoroutine(routine, evt?): void

• Stop a coroutine that was previously started with startCoroutine

  Parameters

  • routine: Generator<unknown, any, unknown>

    the routine to be stopped
  • evt: FrameEvent = FrameEvent.Update

    the frame event to unregister the routine from (default: FrameEvent.Update)

  Returns void

OptionalsupportsXR

• supportsXR(mode): boolean

• Optional callback, you can implement this to only get callbacks for VR or AR sessions if necessary.

  Parameters

  • mode: XRSessionMode

  Returns boolean

  true if the mode is supported (if false the mode is not supported by this component and it will not receive XR callbacks for this mode)

Optionalupdate

• update(): void

• regular callback in a frame (called every frame when implemented)

  Returns void