Procedural Generation 5/21

Assets/Materials/MeshMaterial.mat

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Assets/Materials/MeshMaterial.mat.meta

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Assets/Scripts/MapDisplay.cs

@@ -3,10 +3,18 @@ using UnityEngine;
 public class MapDisplay : MonoBehaviour
 {
     public Renderer textureRenderer;
+    public MeshFilter meshFilter;
+    public MeshRenderer meshRenderer;
 
     public void DrawTexture(Texture2D texture)
     {
         textureRenderer.sharedMaterial.mainTexture = texture;
         textureRenderer.transform.localScale = new Vector3(texture.width, 1, texture.height);
     }
+
+    public void DrawMesh(MeshData meshData, Texture2D texture)
+    {
+        meshFilter.sharedMesh = meshData.CreateMesh();
+        meshRenderer.sharedMaterial.mainTexture = texture;
+    }
 }

Assets/Scripts/MapGenerator.cs

@@ -3,7 +3,7 @@ using UnityEngine;
 public class MapGenerator : MonoBehaviour
 {
 
-    public enum DrawMode { NoiseMap, ColourMap};
+    public enum DrawMode { NoiseMap, ColourMap, Mesh};
     public DrawMode drawMode;
 
     public int mapWidth;
@@ -52,6 +52,9 @@ public class MapGenerator : MonoBehaviour
         } else if (drawMode == DrawMode.ColourMap)
         {
             display.DrawTexture(TextureGenerator.TextureFromColourMap(colourMap, mapWidth, mapHeight));
+        }else if(drawMode == DrawMode.Mesh)
+        {
+            display.DrawMesh(MeshGenerator.GenerateTerrainMesh(noiseMap), TextureGenerator.TextureFromColourMap(colourMap, mapWidth, mapHeight));
         }
     }
 

Assets/Scripts/MeshGenerator.cs

@@ -0,0 +1,70 @@
+using UnityEngine;
+
+public static class MeshGenerator
+{
+    public static MeshData GenerateTerrainMesh(float[,] heightMap)
+    {
+        int width = heightMap.GetLength(0);
+        int height = heightMap.GetLength(1);
+        float topLeftX = (width - 1) / -2f;
+        float topLeftZ = (height - 1) / 2f;
+
+        MeshData meshData = new(width, height);
+        int vertexIndex = 0;
+
+        for(int y=0; y<height; y++)
+        {
+            for(int x=0; x<width; x++)
+            {
+                meshData.vertices[vertexIndex] = new Vector3(topLeftX + x, heightMap[x, y], topLeftZ - y);
+                meshData.uvs[vertexIndex] = new Vector2(x/(float)width, y/(float)height);
+
+                if (x < width - 1 && y < height - 1)
+                {
+                    meshData.AddTriangle(vertexIndex, vertexIndex+width+1, vertexIndex+width);
+                    meshData.AddTriangle(vertexIndex+width+1, vertexIndex, vertexIndex+1);
+                }
+
+                vertexIndex++;
+            }
+        }
+
+        return meshData;
+    }
+}
+
+public class MeshData
+{
+    public Vector3[] vertices;
+    public int[] triangles;
+    public Vector2[] uvs;
+
+    int triangleIndex;
+
+    public MeshData(int meshWidth, int meshHeight)
+    {
+        vertices = new Vector3[meshWidth * meshHeight];
+        uvs = new Vector2[meshWidth * meshHeight];
+        triangles = new int[(meshWidth - 1) * (meshHeight - 1) * 6];
+    }
+
+    public void AddTriangle(int a, int b, int c)
+    {
+        triangles[triangleIndex] = a;
+        triangles[triangleIndex+1] = b;
+        triangles[triangleIndex+2] = c;
+
+        triangleIndex += 3;
+    }
+
+    public Mesh CreateMesh()
+    {
+        Mesh mesh = new();
+        mesh.vertices = vertices;
+        mesh.triangles = triangles;
+        mesh.uv = uvs;
+        mesh.RecalculateNormals();
+
+        return mesh;
+    }
+}

Assets/Scripts/MeshGenerator.cs.meta

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