SaveMesh.cs

IEnumerator SaveMesh()
{
    if (!isSaveMesh)
    {
        yield break;
    }

    isSaveMesh = false;

    string modelData = "";

    int offset = 0;
    int count = 0;
    var filters = mapping.GetMeshFilters();

#if false
    var filter = filters.First();
#else
    foreach (var filter in filters)
#endif
    {
        if (filter != null)
        {
            // OBJ形式で出力する
            var mesh = filter.sharedMesh;

            modelData += string.Format("o object.{0}\n", ++count);

            foreach (var vertex in mesh.vertices)
            {
                // ローカル座標をワールド座標に変換する
                var v = filter.transform.TransformPoint(vertex);
                modelData += string.Format("v {0} {1} {2}\n", v.x, v.y, v.z);
            }

            modelData += "\n";

            // 面を書く
            for (int i = 0; i < mesh.triangles.Length; i += 3)
            {
                modelData += string.Format("f {0} {1} {2}\n",
                    mesh.triangles[i + 0] + 1 + offset,
                    mesh.triangles[i + 1] + 1 + offset,
                    mesh.triangles[i + 2] + 1 + offset);
            }

            modelData += "\n";
            modelData += "\n";

            // 頂点インデックスのオフセットを更新
            offset += mesh.vertexCount;
        }
    }

#if !UNITY_EDITOR
        var ao = KnownFolders.CameraRoll.CreateFileAsync("mapping.obj", CreationCollisionOption.GenerateUniqueName);
        ao.Completed = async delegate {
            if (ao.Status == Windows.Foundation.AsyncStatus.Completed)
            {
                var file = ao.GetResults();

                using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
                {
                    var imageBuffer = Encoding.ASCII.GetBytes(modelData);
                    await stream.WriteAsync(imageBuffer.AsBuffer());
                }

                Debug.Log("write comlete");
            }
            else if(ao.Status == Windows.Foundation.AsyncStatus.Error)
            {
                    Debug.Log(ao.ErrorCode.Message);
            }
        };

        while (ao.Status == Windows.Foundation.AsyncStatus.Started)
        {
            yield return new WaitForEndOfFrame();
        }
#endif
}