RoadCreator.CreateRoad C# (CSharp) Method

    IEnumerator CreateRoad(Vector3 StartPoint)
    {
        List<GameObject> Path = new List<GameObject> ();
        while (true) {
            Vector3 EndPoint = Vector3.zero;
            List<GameObject> ActivePath = new List<GameObject> ();
            Ray r = Camera.main.ScreenPointToRay (Input.mousePosition);
            RaycastHit hit;
            float CellSize = ModuleCreator.Instance.GridCellSize;
            if (Physics.Raycast (r, out hit)) {
                EndPoint = hit.point;
                EndPoint.x = ((EndPoint.x % CellSize < CellSize / 2f) ? CellSize * ((int)(EndPoint.x / CellSize)) : CellSize * ((int)(EndPoint.x / CellSize) + 1)) + 0.5f;
                EndPoint.z = ((EndPoint.z % CellSize < CellSize / 2f) ? CellSize * ((int)(EndPoint.z / CellSize)) : CellSize * ((int)(EndPoint.z / CellSize) + 1)) + 0.5f;
                EndPoint.y = 0;
            } else {
                EndPoint = StartPoint;
            }

            Vector3 RoadVec = EndPoint - StartPoint;
            RoadVec.x = (Mathf.Abs (RoadVec.x) > Mathf.Abs (RoadVec.z)) ? RoadVec.x : 0;
            RoadVec.z = (Mathf.Abs (RoadVec.z) > Mathf.Abs (RoadVec.x)) ? RoadVec.z : 0;
            RoadVec.y = 0f;

            while (Path.Count < RoadVec.magnitude + 1) {//When we need to add more cube to increase the path
                Path.Add (Instantiate (Road, Vector3.zero, Quaternion.identity) as GameObject);
            }

            //we set the cube that we don't need inactive and we set the other active and we add them to the active path
            for (int i = 0; i < Path.Count; i++) {
                if (i > RoadVec.magnitude)
                    Path [i].SetActive (false);
                else {
                    if (!Path [i].activeSelf)
                        Path [i].SetActive (true);
                    ActivePath.Add (Path [i]);
                }
            }

            //we place the cubes along the path
            for (int i = 0; i < ActivePath.Count; i++) {
                if (Physics.Raycast (StartPoint + RoadVec.normalized * i + Vector3.up * 5, Vector3.down, out hit)) {
                    if (hit.collider.tag == "Pipeline") {
                        ActivePath.Remove (ActivePath [i]);
                        ActivePath.Insert (i, null);
                        continue;
                    }
                    ActivePath [i].transform.position = StartPoint + RoadVec.normalized * i;
                    ActivePath [i].transform.position += Vector3.up * hit.point.y;
                    Vector3 normal = hit.normal;
                    if (Mathf.Abs (RoadVec.x) > Mathf.Abs (RoadVec.z)) {
                        normal.z = 0;
                    } else
                        normal.x = 0;
                    ActivePath [i].transform.LookAt (ActivePath [i].transform.position + normal);
                }
            }

            if (Input.GetMouseButtonDown (0) && Input.GetKey (KeyCode.LeftShift)) {
                foreach (var item in ActivePath) {
                    if (item == null)
                        continue;
                    item.transform.parent = transform;
                    item.layer = 0;
                    Path.Remove (item);
                }
                _grid.CreateRoad (StartPoint, ActivePath [ActivePath.Count - 1].transform.position);
                StartPoint = ActivePath [ActivePath.Count - 1].transform.position;
                StartPoint.y = 0;
            } else if (Input.GetMouseButtonDown (0)) {

                foreach (var item in ActivePath.ToArray()) {
                    if (item == null) {
                        ActivePath.Remove (item);
                        continue;
                    }
                    item.transform.parent = transform;
                    item.layer = 0;
                }
                _grid.CreateRoad (StartPoint, ActivePath.Last ().transform.position);
                break;
            }
            yield return null;
        }
        _onCreation = false;
    }

 private void MouseReleaseOnCanvasEventHandler(object sender, MouseEventArgs e)
 {
     if (leftButtonWasPressed == true)
     {
         leftButtonWasPressed = false;
         // drawing Real Road
         if (Tool == Tools.Road)
         {
             RoadCreator.CreateRoad(Canvas, ObjectHandler.Roads, ObjectHandler.Buildings, ObjectHandler.Garages);
         }
     }
 }