Wanna grab somtin in VR?

Grab.cs

using UnityEngine;
using System.Collections;

public class Grab : MonoBehaviour {
	public OVRInput.Controller controller;
	// Use this for initialization
	private GameObject grabbedObject;
	private bool grabbing;

	public const float THRES_GRAB = 0.55f;
	public const float THRES_DROP = 0.35f;
	public float grabRadius;
	public LayerMask grabMask;

	private Quaternion lastRotation, currentRotation;


	void Start () {
		
	}
	void GrabObject(){
		
		grabbing = true;

		RaycastHit[] hits;

		hits = Physics.SphereCastAll (transform.position, grabRadius, transform.forward, 0f, grabMask);

		if (hits.Length > 0) {
			int closestHit = 0;
			for (int i = 0; i < hits.Length; i++) {
				if (hits [i].distance > hits [closestHit].distance)
					closestHit = i;
			}

			grabbedObject = hits [closestHit].transform.gameObject;
			grabbedObject.GetComponent<Rigidbody> ().isKinematic = true;
			grabbedObject.transform.position = transform.position;
			grabbedObject.transform.parent = transform;

		}
	}

	Vector3 GetAngularVelocity(){
		Quaternion deltaRotation = currentRotation * Quaternion.Inverse (lastRotation);
		return new Vector3 (Mathf.DeltaAngle (0, deltaRotation.eulerAngles.x),
			Mathf.DeltaAngle (0, deltaRotation.eulerAngles.y),
			Mathf.DeltaAngle (0, deltaRotation.eulerAngles.z));
	}
			

	void DropObject(){
		grabbing = false;
		if (grabbedObject != null) {
			grabbedObject.transform.parent = null;
			grabbedObject.GetComponent<Rigidbody> ().isKinematic = false;
			grabbedObject.GetComponent<Rigidbody> ().velocity = OVRInput.GetLocalControllerVelocity (controller);
			//grabbedObject.GetComponent<Rigidbody> ().angularVelocity = GetAngularVelocity();
			grabbedObject = null;
		}
	}
	// Update is called once per frame
	void Update () {
		OVRInput.Update ();
		if (grabbedObject != null) {
			lastRotation = currentRotation;
			currentRotation = grabbedObject.transform.rotation;
		}
		if (!grabbing && OVRInput.Get (OVRInput.Axis1D.PrimaryHandTrigger, controller) >= THRES_GRAB)
			GrabObject ();
		if (grabbing && OVRInput.Get (OVRInput.Axis1D.PrimaryHandTrigger, controller) <= THRES_DROP)
			DropObject ();
	}
}