Bug My falloff map isn't working with randomly generated terrain.

So i made this random terrain generator but i want it to be islands so i tried to make a falloff map for it. However when i play it nothing is being generated and i get an error saying "Object reference not set to an instance of an object". Here's my code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class MeshGenerator : MonoBehaviour
6. {
7.     public Mesh mesh;
8.     Vector3[] vertices;
9.     Color[] colors;
10.     int[] triangles;
11.     public Gradient gradient;
12.  
13.     public int XSize = 20;
14.     public int ZSize = 20;
15.     public int octaves;
16.     float minTerrainHeight;
17.     float maxTerrainHeight;
18.  
19.     [Range(0.0f, 100.0f)]
20.     [SerializeField] private float amplitude_1;
21.     [Range(0.0f, 100.0f)]
22.     [SerializeField] private float scale_1;
23.     [Range(0.0f, 1.0f)]
24.     [SerializeField] private float amplitude_2;
25.     [Range(0.0f, 5.0f)]
26.     [SerializeField] private float scale_2;
27.     [Range(0.0f, 1.0f)]
28.     [SerializeField] private float amplitude_3;
29.     [Range(0.0f, 1.0f)]
30.     [SerializeField] private float scale_3;
31.  
32.     private float CalculateNoise(float x, float z)
33.     {
34.         float noise;
35.         noise = Mathf.PerlinNoise(x, z) * 5;
36.         noise += Mathf.PerlinNoise(x * amplitude_1, z * amplitude_1) * scale_1;
37.         noise -= Mathf.PerlinNoise(x * amplitude_2, z * amplitude_2) * scale_2;
38.         noise += Mathf.PerlinNoise(x * amplitude_3, z * amplitude_3) * scale_3 * 2;
39.  
40.         return noise;
41.     }
42.  
43.     void Start()
44.     {
45.         mesh = new Mesh();
46.         GetComponent<MeshFilter>().mesh = mesh;
47.         GetComponent<MeshCollider>().sharedMesh = mesh;
48.         CreateFalloffMap();
49.         CreateShape();
50.     }
51.  
52.     private void Update()
53.     {
54.         UpdateMesh();
55.     }
56.  
57.     void CreateShape()
58.     {
59.         vertices = new Vector3[(XSize + 1) * (ZSize + 1)];
60.  
61.         for (int i = 0, z = 0; z <= ZSize; z++)
62.         {
63.             for (int x = 0; x <= XSize; x++)
64.             {
65.                 float yWithNoise = CalculateNoise(x, z);
66.                 vertices[i] = new Vector3(x, yWithNoise, z);
67.  
68.                 if (yWithNoise > maxTerrainHeight)
69.                 {
70.                     maxTerrainHeight = yWithNoise;
71.                 }
72.                 if (yWithNoise < minTerrainHeight)
73.                 {
74.                     minTerrainHeight = yWithNoise;
75.                 }
76.                 i++;
77.             }
78.         }
79.  
80.         triangles = new int[XSize * ZSize * 6];
81.  
82.         int vert = 0;
83.         int tris = 0;
84.  
85.         for (int z = 0; z < ZSize; z++)
86.         {
87.             for (int x = 0; x < XSize; x++)
88.             {
89.                 triangles[tris + 0] = vert + 0;
90.                 triangles[tris + 1] = vert + XSize + 1;
91.                 triangles[tris + 2] = vert + 1;
92.                 triangles[tris + 3] = vert + 1;
93.                 triangles[tris + 4] = vert + XSize + 1;
94.                 triangles[tris + 5] = vert + XSize + 2;
95.  
96.                 vert++;
97.                 tris += 6;
98.             }
99.             vert++;
100.         }
101.  
102.         colors = new Color[vertices.Length];
103.         for (int i = 0, z = 0; z <= ZSize; z++)
104.         {
105.             for (int x = 0; x <= XSize; x++)
106.             {
107.                 float height = Mathf.InverseLerp(minTerrainHeight, maxTerrainHeight, vertices[i].y);
108.                 colors[i] = gradient.Evaluate(height);
109.                 i++;
110.             }
111.         }
112.     }
113.  
114.     void CreateFalloffMap()
115.     {
116.         float[,] falloffMap = new float[XSize, ZSize];
117.         for (int y = 0; y < ZSize; y++)
118.         {
119.             for (int x = 0; x < XSize; x++)
120.             {
121.                 float xv = x / (float)XSize * 2 - 1;
122.                 float yv = y / (float)ZSize * 2 - 1;
123.                 float v = Mathf.Max(Mathf.Abs(xv), Mathf.Abs(yv));
124.                 falloffMap[x, y] = Mathf.Pow(v, 3f) / (Mathf.Pow(v, 3f) + Mathf.Pow(2.2f - 2.2f * v, 3f));
125.             }
126.         }
127.  
128.         // Apply falloff map to vertices
129.         for (int i = 0, z = 0; z <= ZSize; z++)
130.         {
131.             for (int x = 0; x <= XSize; x++)
132.             {
133.                 vertices[i].y *= falloffMap[x, z];
134.                 i++;
135.             }
136.         }
137.     }
138.  
139.     void UpdateMesh()
140.     {
141.         mesh.Clear();
142.         mesh.vertices = vertices;
143.         mesh.triangles = triangles;
144.  
145.         mesh.RecalculateNormals();
146.         mesh.RecalculateBounds();
147.         MeshCollider meshCollider = gameObject.GetComponent<MeshCollider>();
148.         meshCollider.sharedMesh = mesh;
149.         mesh.colors = colors;
150.     }
151. }

Any help on how to solve the issue is appreciated!

 

The answer is ALWAYS the same when you see this error... ALWAYS! It never varies. Ever.

How to fix a NullReferenceException error

https://forum.unity.com/threads/how-to-fix-a-nullreferenceexception-error.1230297/

Three steps to success:
- Identify what is null <-- any other action taken before this step is WASTED TIME
- Identify why it is null
- Fix that