Why doesn't this do anything when I hit play?

This script is attached to a terrain in my hierarchy. There's nothing else in there (apart from camera, light source):

Code (CSharp):

1.  
2. using UnityEngine;
3.  
4. public class TerrainGenerator : MonoBehaviour
5. {
6.     public int width=256, height=256, depth = 20;
7.     public float scale = 20f;
8.  
9.     void start()
10.     {
11.         print("Start.");
12.         Terrain terrain = GetComponent<Terrain>();
13.         terrain.terrainData = GenerateTerrain(terrain.terrainData);
14.         print("Hello?");
15.     }
16.  
17.     TerrainData GenerateTerrain (TerrainData terrainData)
18.     {
19.         terrainData.heightmapResolution = width + 1;
20.         terrainData.size = new Vector3(width, depth,height);
21.         terrainData.SetHeights(0,0, GenerateHeights());
22.         print("Am I here");
23.         return terrainData;
24.        
25.  
26.  
27.     }
28.  
29.     float[,] GenerateHeights()
30.     {
31.         float[,] heights = new float[width,height];
32.         for (int x = 0; x<width; x++)
33.         {
34.             for (int y = 0; y < height; y++)
35.             {
36.                 heights[x,y] = CalculateHeight (x,y);
37.             }
38.         }
39.         print("Am I here too");
40.         return heights;
41.  
42.     }
43.  
44.     float CalculateHeight(int x, int y)
45.     {
46.         float xCoord = (float)x/width * scale;
47.         float yCoord = (float)y/height * scale;
48.         print("Am I here three");
49.         return Mathf.PerlinNoise(xCoord, yCoord);
50.     }
51.  
52. }
53.  

 

Try

Code (CSharp):

1. terrain.Flush();

to apply changes.

 

It's Start, with a capital S