Scale.cs

using HoloToolkit.Unity.InputModule;
using UnityEngine;
using IInputHandler = HoloToolkit.Unity.InputModule.IInputHandler;
using IManipulationHandler = HoloToolkit.Unity.InputModule.IManipulationHandler;

public class Scale : MonoBehaviour, IInputHandler, IManipulationHandler
{
    private IInputSource currentInputSource = null;
    private uint currentInputSourceId;
    private Vector3 currentScale;
    public void OnInputDown(InputEventData eventData)
    {
        currentInputSource = eventData.InputSource;
        currentInputSourceId = eventData.SourceId;
        currentScale = transform.localScale;
        InputManager.Instance.PushModalInputHandler(gameObject);
        InputManager.Instance.RaiseManipulationStarted(currentInputSource, currentInputSourceId, transform.position);
    }

    public void OnInputUp(InputEventData eventData)
    {
        InputManager.Instance.RaiseManipulationCompleted(currentInputSource, currentInputSourceId, transform.position);
        InputManager.Instance.PopModalInputHandler();
    }

    public void OnManipulationCanceled(ManipulationEventData eventData)
    {
    }

    public void OnManipulationCompleted(ManipulationEventData eventData)
    {
    }

    public void OnManipulationStarted(ManipulationEventData eventData)
    {
    }

    public void OnManipulationUpdated(ManipulationEventData eventData)
    {
        Vector3 scale = currentScale * eventData.CumulativeDelta.x + currentScale;
        transform.localScale = scale;
    }
}