Unity 3D Procedural Terrain - Step 3 - Perlin Noise 1 Layer

using UnityEngine;
using System.Collections;

public class TerrainNoise : MonoBehaviour {

    // Use this for initialization
    void Start () {

        Terrain terrain = GetComponent<Terrain>();

        TerrainData data = terrain.terrainData;

        float[,] heights = new float[ data.heightmapWidth, data.heightmapHeight] ;

        for( int x=0; x< data.heightmapWidth; ++x)
        {
            for( int z=0; z< data.heightmapHeight; ++z)
            {

                heights[x,z] = Mathf.PerlinNoise(x*0.01f, z*0.01f) * 1f  ;

            }
        }

        data.SetHeights(0, 0, heights);

    }

}