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Meshes2Terrain.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using UnityEditor;
+
+public class Meshes2Terrain : EditorWindow {
+
+	[MenuItem("Terrain/Meshes To Terrain", false, 2000)] static void OpenWindow () {
+		EditorWindow.GetWindow<Meshes2Terrain>(true);
+	}
+
+	private int resolution = 512;
+
+	void OnGUI () {
+
+		resolution = EditorGUILayout.IntField("Resolution", resolution);
+		if(GUILayout.Button("Create Terrain")){
+			if(Selection.activeGameObject == null){
+				EditorUtility.DisplayDialog("No object selected", "Please select an object.", "Ok");
+				return;
+			}
+			CreateTerrainByMesh();
+		}
+	}
+
+	void CreateTerrainByMesh()
+	{
+		ShowProgressBar(0,100);
+		TerrainData terrain = new TerrainData();
+		terrain.heightmapResolution = resolution;
+		GameObject terrainObject = Terrain.CreateTerrainGameObject(terrain);
+
+		Undo.RegisterCreatedObjectUndo(terrainObject, "Object to Terrain");
+		List<MeshCollider> cleans = new List<MeshCollider>();
+		GameObject[] objects = Selection.gameObjects;
+		Vector3 maxp = new Vector3(float.MinValue,float.MinValue,float.MinValue);
+		Vector3 minp = new Vector3(float.MaxValue,float.MaxValue,float.MaxValue);
+		foreach (var obj in objects)
+		{
+			MeshCollider col = obj.GetComponent<MeshCollider>();
+			if(!col){
+				col = obj.AddComponent<MeshCollider>();
+				cleans.Add(col);
+			}
+
+			Bounds b = col.bounds;
+			Vector3 pos = col.transform.position;
+			Vector3 tmp = b.max;
+			maxp = new Vector3(Mathf.Max(tmp.x, maxp.x), Mathf.Max(tmp.y, maxp.y), Mathf.Max(tmp.z, maxp.z));
+			tmp = b.min;
+			minp = new Vector3(Mathf.Min(tmp.x, minp.x), Mathf.Min(tmp.y, minp.y, 0), Mathf.Min(tmp.z, minp.z));
+		}
+
+		Vector3 objsSize = maxp - minp;
+		float tExt = Mathf.Max(objsSize.x, objsSize.z);
+		terrain.size = new Vector3(tExt, objsSize.y, tExt);
+
+		float[,] heights = new float[terrain.heightmapResolution, terrain.heightmapResolution];	
+		Ray ray = new Ray(new Vector3(minp.x, maxp.y * 2, minp.z), -Vector3.up);
+		RaycastHit hit = new RaycastHit();
+		Vector3 rayOrigin = ray.origin;
+		int maxHeight = heights.GetLength(0);
+		int maxLength = heights.GetLength(1);
+		Vector2 stepXZ = new Vector2(terrain.size.x / maxLength, terrain.size.z / maxHeight);
+		for(int zCount = 0; zCount < maxHeight; zCount++){
+			for(int xCount = 0; xCount < maxLength; xCount++){
+				float height = 0.0f;
+				if (Physics.Raycast(ray, out hit, maxp.y * 3))
+				{
+					Collider col = hit.collider;
+					Bounds b = col.bounds;
+					float meshHeightInverse = 1 / terrain.size.y;
+					height = Mathf.Max((hit.point.y - minp.y) * meshHeightInverse);
+				}
+				heights[zCount, xCount] = height;
+				rayOrigin.x += stepXZ[0];
+				ray.origin = rayOrigin;
+			}
+			rayOrigin.z += stepXZ[1];
+			rayOrigin.x = minp.x;
+			ray.origin = rayOrigin;
+			ShowProgressBar(zCount,maxHeight);
+		}
+		terrain.SetHeights(0, 0, heights);
+		foreach (var col in cleans)
+		{
+			DestroyImmediate(col);
+		}
+		EditorUtility.ClearProgressBar();
+	}
+
+	void ShowProgressBar(float progress, float maxProgress){
+		float p = progress / maxProgress;
+		EditorUtility.DisplayProgressBar("Creating Terrain...", Mathf.RoundToInt(p * 100f)+ " %", p);
+	}
+}