This property is typically set through the Unity Editor and populated from there during MonoBehaviour start-up, but it can also be set programmatically using InjectOptionalPointableElement(IPointableElement). This property is optional can can return null.For example, a RayInteractable might have a PointableCanvas with which one can interact by pointing a RayInteractor's ray at it, in which case the canvas would be the PointableElement.

This method is automatically invoked by PointerInteractor<TInteractor, TInteractable> as part of the PointerEvent propagation process, and it should not be called directly from outside that process.

This method exists to support Interaction SDK's dependency injection pattern and is not needed for typical Unity Editor-based usage.