eidodragscriptv2

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Camera))]
public class ObjectDragging : MonoBehaviour
{
    private GameObject draggedObject;

    private Rigidbody draggedObjectRigidbody;

    private GameObject oldParent;

    private bool objectHeld;

    private Transform originPoint;

    private new Camera camera;

    void Start()
    {
        camera = GetComponent<Camera>();
    }

	void Update ()
    {
        CheckForGrab();
        ReticleCheck();
	}

    void CheckForGrab()
    {
        if (Input.GetKeyDown(KeyCode.Mouse0))
        {
            if (!objectHeld)
                GrabObject();
            else
                DropObject();
        }
    }

    void ReticleCheck()
    {
        if (objectHeld)
        {
            Ray ray = camera.ScreenPointToRay(new Vector3(camera.pixelWidth / 2, camera.pixelHeight / 2));
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit) && hit.transform.tag != "Draggable")
            {
                DropObject();
            }
        }
    }

    void GrabObject()
    {
        if (!objectHeld)
        {
            Ray ray = camera.ScreenPointToRay(new Vector3(camera.pixelWidth / 2, camera.pixelHeight / 2));
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit) && hit.transform.tag == "Draggable")
            {
                if (hit.distance > 5)
                    return;

                objectHeld = true;
                draggedObject = hit.transform.gameObject;

                draggedObjectRigidbody = draggedObject.GetComponent<Rigidbody>();
                draggedObjectRigidbody.useGravity = false;
                draggedObjectRigidbody.drag = 10;

                oldParent = draggedObject.transform.parent.gameObject;
                draggedObject.transform.parent = this.transform;

            }
        }
    }

    void DropObject()
    {
        objectHeld = false;

        draggedObjectRigidbody.useGravity = true;
        draggedObjectRigidbody.drag = 0;

        draggedObject.transform.parent = oldParent.transform;
    }

}