PerlinNoisePlane in Unity3D

PerlinNoisePlane.cs

using UnityEngine;
    using System.Collections;
 
    public class PerlinNoisePlane : MonoBehaviour {
        public float power = 3.0f;
        public float scale = 1.0f;
        private Vector2 v2SampleStart = new Vector2(0f, 0f);
 
        void Start () {
            MakeSomeNoise ();
        }
 
        void Update () {
            if (Input.GetKeyDown (KeyCode.Space)) {
                v2SampleStart = new Vector2(Random.Range (0.0f, 100.0f), Random.Range (0.0f, 100.0f));
                MakeSomeNoise();
            }
        }
 
        void MakeSomeNoise() {
            MeshFilter mf = GetComponent<MeshFilter>();
            Vector3[] vertices = mf.mesh.vertices;
            for (int i = 0; i < vertices.Length; i++) {    
            float xCoord = v2SampleStart.x + vertices[i].x  * scale;
            float yCoord = v2SampleStart.y + vertices[i].z  * scale;
                vertices[i].y = (Mathf.PerlinNoise (xCoord, yCoord) - 0.5f) * power; 
            }
            mf.mesh.vertices = vertices;
            mf.mesh.RecalculateBounds();
            mf.mesh.RecalculateNormals();
        }
    }