Unity : ClickToInstantiate

ClickToInstantiate.cs

using UnityEngine;
using System.Collections;

public class ClickToInstantiate : MonoBehaviour
{

    public GameObject obj;


    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        if (Input.GetButtonDown("Fire2"))
        {
            RaycastHit hit;
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (GetComponent<Collider>().Raycast(ray, out hit, Mathf.Infinity))
            {
                Instantiate(obj, hit.point, Quaternion.identity);
            }
        }
    }
}