├── README.md
├── Version 2
    ├── Objects.cs
    ├── MeshGeneratorV2.cs
    ├── MeshMat.mat
    └── TerrainShader.shadergraph
└── Version 1
    └── MeshGeneratorV1.cs


/README.md:
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1 | # ProceduralTerrainScripts
2 | 
3 | <b>Version 1</b> => How to Procedurally Generate Terrain<br/>
4 | https://www.youtube.com/watch?v=cLs3CGNV120
5 | 
6 | <b>Version 2</b> => Procedural Terrain Generation - Colours & Spawning random objects<br/>
7 | https://www.youtube.com/watch?v=bd4P5suj-L0
8 | 


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/Version 2/Objects.cs:
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 1 | using System.Collections;
 2 | using System.Collections.Generic;
 3 | using UnityEngine;
 4 | 
 5 | public class Objects : MonoBehaviour
 6 | {
 7 |     void Start()
 8 |     {
 9 |         FindLand();
10 |     }
11 | 
12 |     public void FindLand()
13 |     {
14 |         Ray ray = new Ray(transform.position, -transform.up);
15 |         RaycastHit hitInfo;
16 |         if (Physics.Raycast(ray, out hitInfo))
17 |         {
18 |             transform.position = new Vector3(hitInfo.point.x, hitInfo.point.y, hitInfo.point.z);
19 |         }
20 |         else
21 |         {
22 |             ray = new Ray(transform.position, transform.up);
23 |             if (Physics.Raycast(ray, out hitInfo))
24 |             {
25 |                 transform.position = new Vector3(hitInfo.point.x, hitInfo.point.y, hitInfo.point.z);
26 |             }
27 |         }
28 |     }
29 | }
30 | 


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/Version 1/MeshGeneratorV1.cs:
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  1 | using UnityEngine;
  2 | 
  3 | [RequireComponent(typeof(MeshFilter))]
  4 | public class MeshGeneratorV1 : MonoBehaviour
  5 | {
  6 |     Mesh mesh;
  7 |     private int MESH_SCALE = 500;
  8 |     public AnimationCurve heightCurve;
  9 |     private Vector3[] vertices;
 10 |     private int[] triangles;
 11 | 
 12 |     public int xSize;
 13 |     public int zSize;
 14 | 
 15 |     public float scale; 
 16 |     public int octaves;
 17 |     public float lacunarity;
 18 | 
 19 |     public int seed;
 20 |     private System.Random prng;
 21 |     private Vector2[] octaveOffsets;
 22 | 
 23 | 
 24 |     void Start()
 25 |     {
 26 |         mesh = new Mesh();
 27 |         GetComponent<MeshFilter>().mesh = mesh;
 28 |         CreateNewMap();
 29 |     }
 30 | 
 31 |     public void CreateNewMap()
 32 |     {
 33 |         CreateMeshShape();
 34 |         CreateTriangles();
 35 |         UpdateMesh();
 36 |     }
 37 | 
 38 |     private void CreateMeshShape ()
 39 |     {
 40 |         // Creates seed
 41 |         Vector2[] octaveOffsets = GetOffsetSeed();
 42 | 
 43 |         if (scale <= 0)
 44 |             scale = 0.0001f;
 45 |             
 46 |         // Create vertices array
 47 |         vertices = new Vector3[(xSize + 1) * (zSize + 1)];
 48 | 
 49 |         for (int i = 0, z = 0; z <= zSize; z++)
 50 |         {
 51 |             for (int x = 0; x <= xSize; x++)
 52 |             {
 53 |                 // Assign and set height of each vertices
 54 |                 float noiseHeight = GenerateNoiseHeight(z, x, octaveOffsets);
 55 |                 vertices[i] = new Vector3(x, noiseHeight, z);
 56 |                 i++;
 57 |             }
 58 |         }
 59 |     }
 60 | 
 61 |     private Vector2[] GetOffsetSeed()
 62 |     {
 63 |         seed = Random.Range(0, 1000);
 64 |         // changes area of map
 65 |         System.Random prng = new System.Random(seed);
 66 |         Vector2[] octaveOffsets = new Vector2[octaves];
 67 |                     
 68 |         for (int o = 0; o < octaves; o++) {
 69 |             float offsetX = prng.Next(-100000, 100000);
 70 |             float offsetY = prng.Next(-100000, 100000);
 71 |             octaveOffsets[o] = new Vector2(offsetX, offsetY);
 72 |         }
 73 |         return octaveOffsets;
 74 |     }
 75 | 
 76 |     private float GenerateNoiseHeight(int z, int x, Vector2[] octaveOffsets)
 77 |     {
 78 |         float amplitude = 12;
 79 |         float frequency = 1;
 80 |         float persistence = 0.5f;
 81 |         float noiseHeight = 0;
 82 | 
 83 |         // loop over octaves
 84 |         for (int y = 0; y < octaves; y++)
 85 |         {
 86 |             float mapZ = z / scale * frequency + octaveOffsets[y].y;
 87 |             float mapX = x / scale * frequency + octaveOffsets[y].x;
 88 | 
 89 |             // Create perlinValues  
 90 |             // The *2-1 is to create a flat floor level
 91 |             float perlinValue = (Mathf.PerlinNoise(mapZ, mapX)) * 2 - 1;
 92 |             noiseHeight += heightCurve.Evaluate(perlinValue) * amplitude;
 93 |             frequency *= lacunarity;
 94 |             amplitude *= persistence;
 95 |         }
 96 |         return noiseHeight;
 97 |     }
 98 | 
 99 |     private void CreateTriangles() 
100 |     {
101 |         // Need 6 vertices to create a square (2 triangles)
102 |         triangles = new int[xSize * zSize * 6];
103 |         int vert = 0;
104 |         int tris = 0;
105 | 
106 |         // loop through rows
107 |         for (int z = 0; z < zSize; z++)
108 |         {
109 |             // fill all columns in row
110 |             for (int x = 0; x < xSize; x++)
111 |             {
112 |                 triangles[tris + 0] = vert + 0;
113 |                 triangles[tris + 1] = vert + xSize + 1;
114 |                 triangles[tris + 2] = vert + 1;
115 |                 triangles[tris + 3] = vert + 1;
116 |                 triangles[tris + 4] = vert + xSize + 1;
117 |                 triangles[tris + 5] = vert + xSize + 2;
118 | 
119 |                 vert++;
120 |                 tris += 6;
121 |             }
122 |             vert++;
123 |         }
124 |     }
125 | 
126 |     private void UpdateMesh()
127 |     {
128 |         mesh.Clear();
129 |         mesh.vertices = vertices;
130 |         mesh.triangles = triangles;
131 |         mesh.RecalculateNormals();
132 |         mesh.RecalculateTangents();
133 |         GetComponent<MeshCollider>().sharedMesh = mesh;
134 | 
135 |         gameObject.transform.localScale = new Vector3(MESH_SCALE, MESH_SCALE, MESH_SCALE);
136 |     }
137 | }
138 | 


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/Version 2/MeshGeneratorV2.cs:
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  1 | using System.Collections;
  2 | using System.Collections.Generic;
  3 | using System.Linq;
  4 | using UnityEngine;
  5 | 
  6 | [RequireComponent(typeof(MeshFilter))]
  7 | public class MeshGeneratorV2 : MonoBehaviour
  8 | {
  9 |     Mesh mesh;
 10 |     private int MESH_SCALE = 100;
 11 |     public GameObject[] objects;
 12 |     [SerializeField] private AnimationCurve heightCurve;
 13 |     private Vector3[] vertices;
 14 |     private int[] triangles;
 15 |     
 16 |     private Color[] colors;
 17 |     [SerializeField] private Gradient gradient;
 18 |     
 19 |     private float minTerrainheight;
 20 |     private float maxTerrainheight;
 21 | 
 22 |     public int xSize;
 23 |     public int zSize;
 24 | 
 25 |     public float scale; 
 26 |     public int octaves;
 27 |     public float lacunarity;
 28 | 
 29 |     public int seed;
 30 | 
 31 |     private float lastNoiseHeight;
 32 | 
 33 |     void Start()
 34 |     {
 35 |         // Use this method if you havn't filled out the properties in the inspector
 36 |         // SetNullProperties(); 
 37 | 
 38 |         mesh = new Mesh();
 39 |         GetComponent<MeshFilter>().mesh = mesh;
 40 |         CreateNewMap();
 41 |     }
 42 | 
 43 |     private void SetNullProperties() 
 44 |     {
 45 |         if (xSize <= 0) xSize = 50;
 46 |         if (zSize <= 0) zSize = 50;
 47 |         if (octaves <= 0) octaves = 5;
 48 |         if (lacunarity <= 0) lacunarity = 2;
 49 |         if (scale <= 0) scale = 50;
 50 |     } 
 51 | 
 52 |     public void CreateNewMap()
 53 |     {
 54 |         CreateMeshShape();
 55 |         CreateTriangles();
 56 |         ColorMap();
 57 |         UpdateMesh();
 58 |     }
 59 | 
 60 |     private void CreateMeshShape ()
 61 |     {
 62 |         // Creates seed
 63 |         Vector2[] octaveOffsets = GetOffsetSeed();
 64 | 
 65 |         if (scale <= 0) scale = 0.0001f;
 66 |             
 67 |         // Create vertices
 68 |         vertices = new Vector3[(xSize + 1) * (zSize + 1)];
 69 | 
 70 |         for (int i = 0, z = 0; z <= zSize; z++)
 71 |         {
 72 |             for (int x = 0; x <= xSize; x++)
 73 |             {
 74 |                 // Set height of vertices
 75 |                 float noiseHeight = GenerateNoiseHeight(z, x, octaveOffsets);
 76 |                 SetMinMaxHeights(noiseHeight);
 77 |                 vertices[i] = new Vector3(x, noiseHeight, z);
 78 |                 i++;
 79 |             }
 80 |         }
 81 |     }
 82 | 
 83 |     private Vector2[] GetOffsetSeed()
 84 |     {
 85 |         seed = Random.Range(0, 1000);
 86 |         
 87 |         // changes area of map
 88 |         System.Random prng = new System.Random(seed);
 89 |         Vector2[] octaveOffsets = new Vector2[octaves];
 90 |                     
 91 |         for (int o = 0; o < octaves; o++) {
 92 |             float offsetX = prng.Next(-100000, 100000);
 93 |             float offsetY = prng.Next(-100000, 100000);
 94 |             octaveOffsets[o] = new Vector2(offsetX, offsetY);
 95 |         }
 96 |         return octaveOffsets;
 97 |     }
 98 | 
 99 |     private float GenerateNoiseHeight(int z, int x, Vector2[] octaveOffsets)
100 |     {
101 |         float amplitude = 20;
102 |         float frequency = 1;
103 |         float persistence = 0.5f;
104 |         float noiseHeight = 0;
105 | 
106 |         // loop over octaves
107 |         for (int y = 0; y < octaves; y++)
108 |         {
109 |             float mapZ = z / scale * frequency + octaveOffsets[y].y;
110 |             float mapX = x / scale * frequency + octaveOffsets[y].x;
111 | 
112 |             //The *2-1 is to create a flat floor level
113 |             float perlinValue = (Mathf.PerlinNoise(mapZ, mapX)) * 2 - 1;
114 |             noiseHeight += heightCurve.Evaluate(perlinValue) * amplitude;
115 |             frequency *= lacunarity;
116 |             amplitude *= persistence;
117 |         }
118 |         return noiseHeight;
119 |     }
120 | 
121 |     private void SetMinMaxHeights(float noiseHeight)
122 |     {
123 |         // Set min and max height of map for color gradient
124 |         if (noiseHeight > maxTerrainheight)
125 |             maxTerrainheight = noiseHeight;
126 |         if (noiseHeight < minTerrainheight)
127 |             minTerrainheight = noiseHeight;
128 |     }
129 | 
130 | 
131 |     private void CreateTriangles() 
132 |     {
133 |         // Need 6 vertices to create a square (2 triangles)
134 |         triangles = new int[xSize * zSize * 6];
135 | 
136 |         int vert = 0;
137 |         int tris = 0;
138 |         // Go to next row
139 |         for (int z = 0; z < zSize; z++)
140 |         {
141 |             // fill row
142 |             for (int x = 0; x < xSize; x++)
143 |             {
144 |                 triangles[tris + 0] = vert + 0;
145 |                 triangles[tris + 1] = vert + xSize + 1;
146 |                 triangles[tris + 2] = vert + 1;
147 |                 triangles[tris + 3] = vert + 1;
148 |                 triangles[tris + 4] = vert + xSize + 1;
149 |                 triangles[tris + 5] = vert + xSize + 2;
150 | 
151 |                 vert++;
152 |                 tris += 6;
153 |             }
154 |             vert++;
155 |         }
156 |     }
157 | 
158 |     private void ColorMap()
159 |     {
160 |         colors = new Color[vertices.Length];
161 | 
162 |         // Loop over vertices and apply a color from the depending on height (y axis value)
163 |         for (int i = 0, z = 0; z < vertices.Length; z++)
164 |         {
165 |             float height = Mathf.InverseLerp(minTerrainheight, maxTerrainheight, vertices[i].y);
166 |             colors[i] = gradient.Evaluate(height);
167 |             i++;
168 |         }
169 |     }
170 | 
171 |     private void MapEmbellishments() 
172 |     {
173 |         for (int i = 0; i < vertices.Length; i++)
174 |         {
175 |             // find actual position of vertices in the game
176 |             Vector3 worldPt = transform.TransformPoint(mesh.vertices[i]);
177 |             var noiseHeight = worldPt.y;
178 |             // Stop generation if height difference between 2 vertices is too steep
179 |             if(System.Math.Abs(lastNoiseHeight - worldPt.y) < 25)
180 |             {
181 |                 // min height for object generation
182 |                 if (noiseHeight > 100)
183 |                 {
184 |                     // Chance to generate
185 |                     if (Random.Range(1, 5) == 1)
186 |                     {
187 |                         GameObject objectToSpawn = objects[Random.Range(0, objects.Length)];
188 |                         var spawnAboveTerrainBy = noiseHeight * 2;
189 |                         Instantiate(objectToSpawn, new Vector3(mesh.vertices[i].x * MESH_SCALE, spawnAboveTerrainBy, mesh.vertices[i].z * MESH_SCALE), Quaternion.identity);
190 |                     }
191 |                 }
192 |             }
193 |             lastNoiseHeight = noiseHeight;
194 |         }
195 |     }
196 | 
197 |     private void UpdateMesh()
198 |     {
199 |         mesh.Clear();
200 |         mesh.vertices = vertices;
201 |         mesh.triangles = triangles;
202 |         mesh.colors = colors;
203 |         mesh.RecalculateNormals();
204 |         mesh.RecalculateTangents();
205 | 
206 |         GetComponent<MeshCollider>().sharedMesh = mesh;
207 |         gameObject.transform.localScale = new Vector3(MESH_SCALE, MESH_SCALE, MESH_SCALE);
208 | 
209 |         MapEmbellishments();
210 |     }
211 | 
212 | }
213 | 


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