HoldObject.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GrabObject : MonoBehaviour {
	protected GameObject heldObject;
	protected RaycastHit hit;

	public float heldForwardPosition = 1f;

	public GameObject HeldObject
	{
		get { return this.heldObject; }
		set { this.heldObject = value; }
	}

	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void FixedUpdate () {
		GameObject detectedGrabbable = CheckForGrabbables ();

		if (detectedGrabbable != null) {
			HeldObject = detectedGrabbable;
			HeldObject.GetComponent<Rigidbody> ().useGravity = false;
		}

		holdHeldObject ();

		if (HeldObject && Input.GetKeyDown (KeyCode.R)) {
			GameObject thrownObject = HeldObject;
			HeldObject = null;
			thrownObject.GetComponent<Rigidbody>().AddForce(500f * Vector3.forward);
		}
	}

	GameObject CheckForGrabbables () {
		Ray MyRay = new Ray (Camera.main.transform.position, Camera.main.transform.forward);
		

		Physics.Raycast(MyRay, out hit, 50f);
		if (hit.collider != null && hit.collider.gameObject.tag == "Grabbable") {
			return hit.collider.gameObject;
		}
		return null;
	}

	void holdHeldObject() {
		if (HeldObject) {
			HeldObject.GetComponent<Rigidbody>().velocity = (Camera.main.transform.TransformPoint(Vector3.forward * heldForwardPosition) - HeldObject.GetComponent<Rigidbody>().position) / Time.fixedDeltaTime;
		}
	}
}