unity三维地球实现方法

调arcgisonline瓦片服务，在unity中生成三维地球。

基本原理

构建三维地球网格，将瓦片地图做为材质贴图赋给没有网格面。

瓦片数据获取Services:

NatGeo_World_Map (MapServer)
USA_Topo_Maps (MapServer)
World_Imagery (MapServer)
World_Physical_Map (MapServer)
World_Shaded_Relief (MapServer)
World_Street_Map (MapServer)
World_Terrain_Base (MapServer)
World_Topo_Map (MapServer)

支持以上地图读取

高德地图：

http://webst04.is.autonavi.com/appmaptile?style=6&x=0&y=0&z=1

tring Url = "http://webst04.is.autonavi.com/appmaptile?style=6&x="+ i + "&y="+ j+ "&z="+ z ;

地球创建

经度分段

    public void getEquator(float radius,float subdivisions){Quaternion quaternion = new Quaternion();Matrix4x4 matRot = new Matrix4x4();Vector3 point = new Vector3();Vector3 one = new Vector3(radius, 0, 0);float angle = 360 / (subdivisions);for (int i = 0; i < subdivisions; i++){float newAngle = angle * i;quaternion = Quaternion.Euler(new Vector3(0, newAngle, 0));matRot.SetTRS(Vector3.zero, quaternion, new Vector3(1, 1, 1));point = matRot.MultiplyPoint3x4(one);string name = i + "&" +(int)subdivisions*0.5f;points.Add(name, writeJosn(point));instancePoint(point, name);longlatCreat(one, i, newAngle);}}

纬度分段

 /// <summary>/// 墨卡托转经纬度/// </summary>/// <param name="target">赤道点</param>/// <param name="FaName">经度编号</param>/// <param name="_angle">经度</param>void longlatCreat(Vector3 target, int FaName, float _angle){double halfSub = (double)((subdivisions) * 0.5f);double unit = 20037508.3427 / (halfSub*1.0000);Quaternion quaternion = new Quaternion();Matrix4x4 matRot = new Matrix4x4();Vector3 point = new Vector3();string name;for (int i = 0; i < halfSub; i++){double mercatorY = unit * (i+1);double angle = webMercator2lonLat(mercatorY);Debug.Log(i + "=" + ( - angle)+"&"+ mercatorY);quaternion = Quaternion.Euler(new Vector3(0, _angle, float.Parse((-(angle)).ToString())));matRot.SetTRS(Vector3.zero, quaternion, new Vector3(1, 1, 1));point = matRot.MultiplyPoint3x4(target);name = FaName + "&" + (halfSub+(i+1));points.Add(name, writeJosn(point));instancePoint(point, name);quaternion = Quaternion.Euler(new Vector3(0, _angle, float.Parse((angle).ToString())));matRot.SetTRS(Vector3.zero, quaternion, new Vector3(1, 1, 1));point = matRot.MultiplyPoint3x4(target);name = FaName + "&" + (halfSub - (i + 1));points.Add(name, writeJosn(point));instancePoint(point, name);}string jsonInfo = JsonMapper.ToJson(points);Save("5_32Jmercator", jsonInfo);}

/// <summary>/// 求北纬/// </summary>/// <param name="mercator"></param>/// <returns></returns>double webMercator2lonLat(double mercatorY){double lonlat;double y = (mercatorY / 20037508.34) * 180.000;y = (180.000 / Math.PI) * (2 * Math.Atan(Math.Exp(y * Math.PI / 180.000)) - (Math.PI / 2));Debug.Log(Mathf.Exp(Mathf.PI));Debug.Log(Math.Exp(Math.PI));lonlat = y;return lonlat;}

瓦片读取

瓦片细分

  void  CreateMeshAll_samll (int x,int y,int z){string one = x + "&" + y + "&"+ (z-1);Debug.Log(one);string two = (x+1) + "&" + y + "&" + (z - 1); string three = x + "&" + (y+1) + "&" + (z - 1); string four = (x + 1) + "&" + (y + 1) + "&" + (z - 1); string name_00 = (x * 2) + "&" + (y * 2)+"&"+z;string name_01 = (x * 2) + "&" + ((y * 2)+1) + "&" + z;string name_02 = (x * 2) + "&" + ((y * 2) + 2) + "&" + z;string name_10 = ((x * 2)+1) + "&" + (y * 2) + "&" + z;string name_11 = ((x * 2) + 1) + "&" + ((y * 2) + 1) + "&" + z;string name_12 = ((x * 2) + 1) + "&" + ((y * 2) + 2) + "&" + z;string name_20 = ((x * 2) + 2) + "&" + (y * 2) + "&" + z;string name_21 = ((x * 2) + 2) + "&" + ((y * 2) + 1) + "&" + z;string name_22 = ((x * 2) + 2) + "&" + ((y * 2) + 2) + "&" + z;Vector3 _one = printAll[one];Vector3 _two = printAll[two];Vector3 _three=printAll[three];Vector3 _four = printAll[four];addDic(name_00, _one);addDic(name_01, (_one+ _three) *0.5f);addDic(name_02, _three);addDic(name_10, (_one + _two) * 0.5f);addDic(name_11, (_one + _two+ _three+ _four) * 0.25f);addDic(name_12, (_three + _four) * 0.5f);addDic(name_20, _two);addDic(name_21, (_two + _four) * 0.5f);addDic(name_22, _four);}

  public void CreateMeshAll(int beginX, int beginY, int times, Material mat, GameObject Fa, string name){int z=5;if (!have.ContainsKey(name)){//  JsonData Points = JsonMapper.ToObject(Json);List<Vector3> PosList = new List<Vector3>();List<int> Triangles = new List<int>();List<Vector2> uvs = new List<Vector2>();Mesh mesh = new Mesh();int offet = (int)Mathf.Pow(2, (z - times));//z是根据json128定的，2的z次方是128if (offet < 1){offet = 1;z = times;}Debug.Log(offet);string one;if ((beginX + 1) * offet < Mathf.Pow(2, z))//2的7次方{one = (beginX * offet) + "&" + (beginY * offet) + "&" + z;string two = ((1 + beginX) * offet) + "&" + (beginY * offet) + "&" + z;string three = (beginX * offet) + "&" + ((1 + beginY) * offet) + "&" + z;string four = ((1 + beginX) * offet) + "&" + ((1 + beginY) * offet) + "&" + z;// Debug.Log(one + "," + two + "," + three + "," + four);PosList.Add(printAll[one]);PosList.Add(printAll[two]);PosList.Add(printAll[three]);PosList.Add(printAll[four]);}else{one = (beginX * offet) + "&" + (beginY * offet) + "&" + z;string two = 0 + "&" + (beginY * offet) + "&" + z;string three = (beginX * offet) + "&" + ((1 + beginY) * offet) + "&" + z;string four = (0) + "&" + ((1 + beginY) * offet) + "&" + z;PosList.Add(printAll[one]);PosList.Add(printAll[two]);PosList.Add(printAll[three]);PosList.Add(printAll[four]);}Triangles.Add(0);Triangles.Add(2);Triangles.Add(1);Triangles.Add(1);Triangles.Add(2);Triangles.Add(3);uvs.Add(new Vector2(1, 1));uvs.Add(new Vector2(0, 1));uvs.Add(new Vector2(1, 0));uvs.Add(new Vector2(0, 0));GameObject go = new GameObject();MeshFilter filter = go.AddComponent<MeshFilter>();filter.sharedMesh = mesh;mesh.vertices = PosList.ToArray();mesh.triangles = Triangles.ToArray();mesh.uv = uvs.ToArray();mesh.RecalculateNormals();mesh.RecalculateBounds();MeshRenderer renderer = go.AddComponent<MeshRenderer>();renderer.material = mat;go.name = name;go.AddComponent<MeshCollider>();go.transform.parent = Fa.transform;have.Add(name, go);}}

瓦片读取

这里的服务地址可以切换。demo中只到9级

比如

http://server.arcgisonline.com/arcgis/rest/services/World_Topo_Map/MapServer/tile/12/0/0

到12级

http://cache1.arcgisonline.cn/arcgis/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/10/0/0

到10级

也可以使用其他瓦片服务

 IEnumerator getEartALL(int Count, int x, int y, int z, string date, GameObject Fa, int All){for (int i = x; i < Count + x; i++){for (int j = y; j < Count + y; j++){string Url = "http://server.arcgisonline.com/arcgis/rest/services/World_Physical_Map/MapServer/tile/" + z + "/" + j + "/" + i;//影像地图Debug.Log(Url);                                                                                         using (var webRequest = UnityWebRequestTexture.GetTexture(Url)){yield return webRequest.SendWebRequest();if (webRequest.isNetworkError || webRequest.isHttpError){Debug.LogError(webRequest.error);}else{Texture2D texture = DownloadHandlerTexture.GetContent(webRequest);Texture2D texture_h;Material mat = new Material(MAT);string name = i + "&" + j + "&" + z;mat.mainTexture = texture;CreateMeshAll( (All - i), j, z, mat, Fa,name);}}}}}

demo下载（本demo只完成框架部分，具体展示方法需要自己完善）demo下载地址https://download.csdn.net/download/dxs1990/85011867

注：

本demo读取瓦片http://server.arcgisonline.com/arcgis/rest/services/USA_Topo_Maps/MapServer/tile/0/0/0注意是否服务还可以使用

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