Previewing mesh before instantiating

Solved it. Basically created a new boolean and defined the preview mesh in a game object. When I enter build mode it creates the preview mesh and changes the bool, and then I update the instantiated mesh's position. bool IsBuilding; [SerializeField] private GameObject previewMesh; [SerializeField] private GameObject actualMesh; [SerializeField] private Camera camera; private Vector3 origin; private Vector3 direction; bool isCreated = false; GameObject preview;

     // Use this for initialization
     void Start () {
         IsBuilding = false;
     }
     
     private void FixedUpdate()
     {
         origin = camera.transform.position;
         direction = camera.transform.forward;
 
         if (Input.GetKeyUp(KeyCode.Mouse2) && IsBuilding == false)
         {
             ActivateBuildMode();
             
         }
         else if (Input.GetKeyUp(KeyCode.Mouse2) && IsBuilding == true)
         {
             DeactivateBuildMode();
         }
 
         if (IsBuilding == true)
         {
             RaycastHit hit;
 
             if (Physics.Raycast(origin, direction, out hit, 150) && hit.collider.tag == "Finish")
             {   
                 if(isCreated == false)
                 {
                     preview = Instantiate(previewMesh, hit.point, hit.transform.rotation);
                     isCreated = true;
                 }
                 
                 preview.transform.position = hit.point;
                 Debug.DrawRay(origin, direction, Color.red);
                 if (Input.GetKeyUp(KeyCode.Mouse0))
                 {
                     Instantiate(actualMesh, hit.point, hit.transform.rotation);
                     Destroy(previewMesh);
                 }
             }
         }
         
     }
 
     void ActivateBuildMode()
     {
         IsBuilding = true;
         Debug.Log("Build Mode Activated");
     }
 
     void DeactivateBuildMode()
     {
         IsBuilding = false;
         Debug.Log("Build Mode Deactivated");
     }
 }