Class DragControls

DragControls allows you to drag objects around in the scene. It can be used to move objects in 2D (screen space) or 3D (world space). Debug mode can be enabled with the URL parameter ?debugdrag, which shows visual helpers and logs drag operations.

Hierarchy (View Summary, Expand)

Implements

Properties

dragMode gameObject guid keepRotation showGizmo snapGridResolution sourceId? xrDistanceDragFactor xrDragMode xrKeepRotation

Accessors

activeAndEnabled context destroyed draggedObject enabled forward layer name right scene static tag up worldEuler worldPosition worldQuaternion worldRotation CurrentlySelected HasAnySelected

Methods

addEventListener destroy dispatchEvent earlyUpdate? lateUpdate? onAfterRender? onBeforeRender? onBeforeXR? onCollisionEnter? onCollisionExit? onCollisionStay? onDestroy onEnterXR? onLeaveXR? onPausedChanged? onPointerClick? onTriggerEnter? onTriggerExit? onTriggerStay? onUpdateXR? onValidate? onXRControllerAdded? onXRControllerRemoved? removeEventListener resolveGuids? setTargetObject setWorldPosition setWorldQuaternion setWorldRotation startCoroutine stopCoroutine supportsXR?

Properties

dragMode

dragMode: DragMode = DragMode.DynamicViewAngle

Determines how and where the object is dragged along. Different modes include dragging along a plane, attached to the pointer, or following surface normals.

gameObject

gameObject: GameObject

Reference to the GameObject this component is attached to This is a three.js Object3D with additional GameObject functionality

guid

guid: string = "invalid"

Unique identifier for this component instance, used for finding and tracking components

keepRotation

keepRotation: boolean = true

When true, maintains the original rotation of the dragged object while moving it. When false, allows the object to rotate freely during dragging.

showGizmo

showGizmo: boolean = false

When enabled, draws a visual line from the dragged object downwards to the next raycast hit, providing visual feedback about the object's position relative to surfaces below it.

snapGridResolution

snapGridResolution: number = 0.0

Snaps dragged objects to a 3D grid with the specified resolution. Set to 0 to disable snapping.

OptionalsourceId

sourceId?: string

Identifier for the source asset that created this component. For example, URL to the glTF file this component was loaded from

xrDistanceDragFactor

xrDistanceDragFactor: number = 1

Multiplier that affects how quickly objects move closer or further away when dragging in XR. Higher values make distance changes more pronounced. This is similar to mouse acceleration on a screen.

xrDragMode

xrDragMode: DragMode = DragMode.Attached

Determines how and where the object is dragged along while dragging in XR. Uses a separate setting from regular drag mode for better XR interaction.

xrKeepRotation

xrKeepRotation: boolean = false

When true, maintains the original rotation of the dragged object during XR dragging. When false, allows the object to rotate freely during XR dragging.

Accessors

activeAndEnabled

  • get activeAndEnabled(): boolean

    Checks if this component is currently active (enabled and part of an active GameObject hierarchy) Components that are inactive won't receive lifecycle method calls

    Returns boolean

    True if the component is enabled and all parent GameObjects are active

context

  • get context(): Context

    The context this component belongs to, providing access to the runtime environment including physics, timing utilities, camera, and scene

    Returns Context

  • set context(context: Context): void

    Parameters

    Returns void

destroyed

  • get destroyed(): boolean

    Checks if this component has been destroyed

    Returns boolean

    True if the component or its GameObject has been destroyed

draggedObject

  • get draggedObject(): null | Object3D<Object3DEventMap>

    Returns the object currently being dragged by this DragControls component, if any.

    Returns null | Object3D<Object3DEventMap>

    The object being dragged or null if no object is currently dragged

enabled

  • get enabled(): boolean

    Controls whether this component is enabled Disabled components don't receive lifecycle callbacks

    Returns boolean

  • set enabled(val: boolean): void

    Parameters

    • val: boolean

    Returns void

forward

  • get forward(): Vector3

    Gets the forward direction vector (0,0,-1) of this component's GameObject in world space

    Returns Vector3

layer

  • get layer(): number

    The layer value of the GameObject this component is attached to Used for visibility and physics filtering

    Returns number

name

  • get name(): string

    The name of the GameObject this component is attached to Used for debugging and finding objects

    Returns string

  • set name(str: string): void

    Parameters

    • str: string

    Returns void

right

  • get right(): Vector3

    Gets the right direction vector (1,0,0) of this component's GameObject in world space

    Returns Vector3

scene

  • get scene(): Scene

    Shorthand accessor for the current scene from the context

    Returns Scene

    The scene this component belongs to

static

  • get static(): boolean

    Indicates whether the GameObject is marked as static Static objects typically don't move and can be optimized by the engine

    Returns boolean

  • set static(value: boolean): void

    Parameters

    • value: boolean

    Returns void

tag

  • get tag(): string

    The tag of the GameObject this component is attached to Used for categorizing objects and efficient lookup

    Returns string

  • set tag(str: string): void

    Parameters

    • str: string

    Returns void

up

  • get up(): Vector3

    Gets the up direction vector (0,1,0) of this component's GameObject in world space

    Returns Vector3

worldEuler

  • get worldEuler(): Euler

    Gets the rotation of this component's GameObject in world space as Euler angles (in radians)

    Returns Euler

  • set worldEuler(val: Euler): void

    Sets the rotation of this component's GameObject in world space using Euler angles (in radians)

    Parameters

    • val: Euler

      The world rotation Euler angles to set

    Returns void

worldPosition

  • get worldPosition(): Vector3

    Gets the position of this component's GameObject in world space

    Returns Vector3

  • set worldPosition(val: Vector3): void

    Sets the position of this component's GameObject in world space

    Parameters

    • val: Vector3

      The world position vector to set

    Returns void

worldQuaternion

  • get worldQuaternion(): Quaternion

    Gets the rotation of this component's GameObject in world space as a quaternion

    Returns Quaternion

  • set worldQuaternion(val: Quaternion): void

    Sets the rotation of this component's GameObject in world space using a quaternion

    Parameters

    • val: Quaternion

      The world rotation quaternion to set

    Returns void

worldRotation

  • get worldRotation(): Vector3

    Gets the rotation of this component's GameObject in world space as Euler angles (in degrees)

    Returns Vector3

  • set worldRotation(val: Vector3): void

    Sets the rotation of this component's GameObject in world space using Euler angles (in degrees)

    Parameters

    • val: Vector3

      The world rotation vector to set (in degrees)

    Returns void

StaticCurrentlySelected

  • get CurrentlySelected(): DragControls[]

    Retrieves a list of all DragControl components that are currently dragging objects.

    Returns DragControls[]

    Array of currently active DragControls components

StaticHasAnySelected

  • get HasAnySelected(): boolean

    Checks if any DragControls component is currently active with selected objects

    Returns boolean

    True if any DragControls component is currently active

Methods

addEventListener

  • addEventListener<T extends Event>(type: string, listener: (evt: T) => any): void

    Registers an event listener for the specified event type

    Type Parameters

    Parameters

    • type: string

      The event type to listen for

    • listener: (evt: T) => any

      The callback function to execute when the event occurs

    Returns void

destroy

  • destroy(): void

    Destroys this component and removes it from its GameObject After destruction, the component will no longer receive lifecycle callbacks

    Returns void

dispatchEvent

  • dispatchEvent(evt: Event): boolean

    Dispatches an event to all registered listeners

    Parameters

    • evt: Event

      The event object to dispatch

    Returns boolean

    Always returns false (standard implementation of EventTarget)

OptionalearlyUpdate

  • earlyUpdate(): void

    Called at the beginning of each frame before regular updates. Use for logic that needs to run before standard update callbacks.

    Returns void

OptionallateUpdate

  • lateUpdate(): void

    Called after all update functions have been called. Use for calculations that depend on other components being updated first.

    Returns void

OptionalonAfterRender

  • onAfterRender(): void

    Called after the scene has been rendered. Use for post-processing or UI updates that should happen after rendering

    Returns void

OptionalonBeforeRender

  • onBeforeRender(frame: null | XRFrame): void

    Called immediately before the scene is rendered.

    Parameters

    • frame: null | XRFrame

      Current XRFrame if in an XR session, null otherwise

    Returns void

OptionalonBeforeXR

  • onBeforeXR(mode: XRSessionMode, args: XRSessionInit): void

    Called before an XR session is requested Use to modify session initialization parameters

    Parameters

    • mode: XRSessionMode

      The XR session mode being requested

    • args: XRSessionInit

      The session initialization parameters that can be modified

    Returns void

OptionalonCollisionEnter

  • onCollisionEnter(col: Collision): any

    Called when this component's collider begins colliding with another collider.

    Parameters

    • col: Collision

      Information about the collision that occurred

    Returns any

OptionalonCollisionExit

  • onCollisionExit(col: Collision): any

    Called when this component's collider stops colliding with another collider.

    Parameters

    • col: Collision

      Information about the collision that ended

    Returns any

OptionalonCollisionStay

  • onCollisionStay(col: Collision): any

    Called each frame while this component's collider is colliding with another collider

    Parameters

    • col: Collision

      Information about the ongoing collision

    Returns any

onDestroy

  • onDestroy(): void

    Called when the component is destroyed. Use for cleanup operations like removing event listeners

    Returns void

OptionalonEnterXR

OptionalonLeaveXR

OptionalonPausedChanged

  • onPausedChanged(isPaused: boolean, wasPaused: boolean): void

    Called when the context's pause state changes.

    Parameters

    • isPaused: boolean

      Whether the context is currently paused

    • wasPaused: boolean

      The previous pause state

    Returns void

OptionalonPointerClick

OptionalonTriggerEnter

  • onTriggerEnter(col: ICollider): any

    Called when this component's trigger collider is entered by another collider

    Parameters

    • col: ICollider

      The collider that entered this trigger

    Returns any

OptionalonTriggerExit

  • onTriggerExit(col: ICollider): any

    Called when another collider exits this component's trigger collider

    Parameters

    • col: ICollider

      The collider that exited this trigger

    Returns any

OptionalonTriggerStay

  • onTriggerStay(col: ICollider): any

    Called each frame while another collider is inside this component's trigger collider

    Parameters

    • col: ICollider

      The collider that is inside this trigger

    Returns any

OptionalonUpdateXR

OptionalonValidate

  • onValidate(prop?: string): void

    Called when a field decorated with @validate() is modified.

    Parameters

    • Optionalprop: string

      The name of the field that was changed

    Returns void

OptionalonXRControllerAdded

OptionalonXRControllerRemoved

removeEventListener

  • removeEventListener<T extends Event>(
        type: string,
        listener: (arg: T) => any,
    ): void

    Removes a previously registered event listener

    Type Parameters

    Parameters

    • type: string

      The event type the listener was registered for

    • listener: (arg: T) => any

      The callback function to remove

    Returns void

OptionalresolveGuids

  • resolveGuids(guidsMap: GuidsMap): void

    Called when this component needs to remap guids after an instantiate operation.

    Parameters

    • guidsMap: GuidsMap

      Mapping from old guids to newly generated guids

    Returns void

setTargetObject

  • setTargetObject(obj: null | Object3D<Object3DEventMap>): void

    Updates the object that is being dragged by the DragControls. This can be used to change the target during a drag operation.

    Parameters

    • obj: null | Object3D<Object3DEventMap>

      The new object to drag, or null to stop dragging

    Returns void

setWorldPosition

  • setWorldPosition(x: number, y: number, z: number): void

    Sets the position of this component's GameObject in world space using individual coordinates

    Parameters

    • x: number

      X-coordinate in world space

    • y: number

      Y-coordinate in world space

    • z: number

      Z-coordinate in world space

    Returns void

setWorldQuaternion

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

    Sets the rotation of this component's GameObject in world space using quaternion components

    Parameters

    • x: number

      X component of the quaternion

    • y: number

      Y component of the quaternion

    • z: number

      Z component of the quaternion

    • w: number

      W component of the quaternion

    Returns void

setWorldRotation

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

    Sets the rotation of this component's GameObject in world space using individual Euler angles

    Parameters

    • x: number

      X-axis rotation

    • y: number

      Y-axis rotation

    • z: number

      Z-axis rotation

    • degrees: boolean = true

      Whether the values are in degrees (true) or radians (false)

    Returns void

startCoroutine

  • startCoroutine(routine: Generator, evt?: FrameEvent): Generator

    Starts a coroutine that can yield to wait for events. Coroutines allow for time-based sequencing of operations without blocking. Coroutines are based on generator functions, a JavaScript language feature.

    Parameters

    • routine: Generator

      Generator function to start

    • evt: FrameEvent = FrameEvent.Update

      Event to register the coroutine for (default: FrameEvent.Update)

    Returns Generator

    The generator function that can be used to stop the coroutine

    Example

    Time-based sequencing of operations

    *myCoroutine() {
      yield WaitForSeconds(1); // wait for 1 second
      yield WaitForFrames(10); // wait for 10 frames
      yield new Promise(resolve => setTimeout(resolve, 1000)); // wait for a promise to resolve
    }

    Example

    Coroutine that logs a message every 5 frames

    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;
      }
    }

stopCoroutine

  • stopCoroutine(routine: Generator, evt?: FrameEvent): void

    Stops a coroutine that was previously started with startCoroutine

    Parameters

    • routine: Generator

      The routine to be stopped

    • evt: FrameEvent = FrameEvent.Update

      The frame event the routine was registered with

    Returns void

OptionalsupportsXR

  • supportsXR(mode: XRSessionMode): boolean

    Determines if this component supports a specific XR mode

    Parameters

    • mode: XRSessionMode

      The XR session mode to check support for

    Returns boolean

    True if the component supports the specified mode

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