Unity3D 多維子Mesh合併

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Multi-MaterialMeshMergeSnippet:MonoBehaviour
{
     public void AdvancedMerge()
     {
      // All our children (and us)
      MeshFilter[] filters = GetComponentsInChildren (false);

      // All the meshes in our children (just a big list)
      List materials = new List();
      MeshRenderer[] renderers = GetComponentsInChildren (false); // <-- you can optimize this
      foreach (MeshRenderer renderer in renderers)
      {
       if (renderer.transform == transform)
        continue;
       Material[] localMats = renderer.sharedMaterials;
       foreach (Material localMat in localMats)
        if (!materials.Contains (localMat))
         materials.Add (localMat);
      }

      // Each material will have a mesh for it.
      List submeshes = new List();
      foreach (Material material in materials)
      {
       // Make a combiner for each (sub)mesh that is mapped to the right material.
       List combiners = new List ();
       foreach (MeshFilter filter in filters)
       {
        if (filter.transform == transform) continue;
        // The filter doesn't know what materials are involved, get the renderer.
        MeshRenderer renderer = filter.GetComponent ();  // <-- (Easy optimization is possible here, give it a try!)
        if (renderer == null)
        {
         Debug.LogError (filter.name + " has no MeshRenderer");
         continue;
        }

        // Let's see if their materials are the one we want right now.
        Material[] localMaterials = renderer.sharedMaterials;
        for (int materialIndex = 0; materialIndex < localMaterials.Length; materialIndex++)
        {
         if (localMaterials [materialIndex] != material)
          continue;
         // This submesh is the material we're looking for right now.
         CombineInstance ci = new CombineInstance();
         ci.mesh = filter.sharedMesh;
         ci.subMeshIndex = materialIndex;
         ci.transform = Matrix4x4.identity;
         combiners.Add (ci);
        }
       }
       // Flatten into a single mesh.
       Mesh mesh = new Mesh ();
       mesh.CombineMeshes (combiners.ToArray(), true);
       submeshes.Add (mesh);
      }

      // The final mesh: combine all the material-specific meshes as independent submeshes.
      List finalCombiners = new List ();
      foreach (Mesh mesh in submeshes)
      {
       CombineInstance ci = new CombineInstance ();
       ci.mesh = mesh;
       ci.subMeshIndex = 0;
       ci.transform = Matrix4x4.identity;
       finalCombiners.Add (ci);
      }
      Mesh finalMesh = new Mesh();
      finalMesh.CombineMeshes (finalCombiners.ToArray(), false);
      myMeshFilter.sharedMesh = finalMesh;
      Debug.Log ("Final mesh has " + submeshes.Count + " materials.");
     }
}