Combine meshes in Unity

Unity Engine
1

Hi,
I have this house made with parts in Unity editor, and i would like to make this house to become like one mesh.
Found this script but it have problems, some parts become invisible. My house is prefab and static is off.

using UnityEngine;
using System.Collections.Generic;

[AddComponentMenu("Mesh/Combine Children")]
public class CombineChildren : MonoBehaviour {

void Start()
{
  Matrix4x4 myTransform = transform.worldToLocalMatrix;
  Dictionary<Material, List<CombineInstance>> combines = new Dictionary<Material, List<CombineInstance>>();
  MeshRenderer[] meshRenderers = GetComponentsInChildren<MeshRenderer>();
  foreach (var meshRenderer in meshRenderers)
  {
   foreach (var material in meshRenderer.sharedMaterials)
    if (material != null && !combines.ContainsKey(material))
     combines.Add(material, new List<CombineInstance>());
  }

  MeshFilter[] meshFilters = GetComponentsInChildren<MeshFilter>();
  foreach(var filter in meshFilters)
  {
   if (filter.sharedMesh == null)
    continue;
   CombineInstance ci = new CombineInstance();
   ci.mesh = filter.sharedMesh;
   ci.transform = myTransform * filter.transform.localToWorldMatrix;
   combines[filter.renderer.sharedMaterial].Add(ci);
   filter.renderer.enabled = false;
  }

  foreach(Material m in combines.Keys)
  {
   var go = new GameObject("Combined mesh");
   go.transform.parent = transform;
   go.transform.localPosition = Vector3.zero;
   go.transform.localRotation = Quaternion.identity;
   go.transform.localScale = Vector3.one;

   var filter = go.AddComponent<MeshFilter>();
   filter.mesh.CombineMeshes(combines[m].ToArray(), true, true);
   var renderer = go.AddComponent<MeshRenderer>();
   renderer.material = m;
  }
}
}
2

First thing that comes to my mind is that your mesh contains contains faces that are backwards.

3

Model looks normal before i attach CombineChildren script.

4

think he meant the normals are getting flipped in the combination…