Unity - RotRay

using UnityEngine;

public class TestRay : MonoBehaviour {
	public Quaternion spawnRot;
	public bool isWork;

	void Update () {
		if (isWork) {
			isWork = false;
			CastRay ();
		}
	}

	void CastRay () {
		Ray newRay = new Ray (transform.position, -transform.up * 100);
		RaycastHit newRaycastHit;

		if (Physics.Raycast (newRay, out newRaycastHit)) {
			if (newRaycastHit.collider.GetComponent <Terrain> ()) {
				spawnRot = Quaternion.FromToRotation (newRaycastHit.transform.position + newRaycastHit.transform.up, newRaycastHit.normal);
				Debug.Log (spawnRot);
			}
		}

		transform.rotation = spawnRot;
	}
}