Move Gameobject with mouse click relative to camera.

MouseClickPosition.cs

using UnityEngine;
using System.Collections;

public class MouseClickPosition : MonoBehaviour
{
	public Camera cam;

	public Transform target;

	public bool useRaycast = false;

	public LayerMask maskFilter;
	private RaycastHit hit;

	public float distanceToCamera = 10f;

	private void Update()
	{
		if(Input.GetMouseButtonDown(0))
		{
			if(useRaycast)
			{
				// hit ?
				if(Physics.Raycast(cam.ScreenPointToRay(Input.mousePosition), out hit, distanceToCamera, maskFilter))
				{
					// move to position
					target.position = hit.point;
				}
			}
			else
			{
				// move to position
				target.position = cam.ScreenToWorldPoint(Input.mousePosition + Vector3.forward * distanceToCamera);
			}
		}
	}
}