zombie_mp/Assets/Scripts/Helpers/BulkMeshBoneSwapper.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using EasyButtons;
public class BulkMeshBoneSwapper : MonoBehaviour
{
    public Transform srcRootBone;

    [Button]
    void Recalculate()
    {
        SkinnedMeshRenderer[] meshes = GetComponentsInChildren<SkinnedMeshRenderer>();
        for (int x = 0; x < meshes.Length; x++)
        {
            if(meshes[x]==null){Debug.Log("Ignoring null object : " + meshes[x].name);continue;}

           // meshes[x].rootBone = srcRootBone;
            //target.bones = src.bones;
            Transform[] bonesT = new Transform[meshes[x].bones.Length];
            for (int i = 0; i < meshes[x].bones.Length; i++)
            {
                Transform targetBone = meshes[x].bones[i];
                if(targetBone==null){continue;}
                string targetBoneName = targetBone.name;
                foreach (Transform sourceBone in srcRootBone.GetComponentsInChildren<Transform>())
                {
                    if (targetBoneName == sourceBone.name)
                    {
                        Debug.Log("Switching bone : " + targetBoneName);
                        bonesT[i] = sourceBone;
                        break;
                    }
                }
            }
            meshes[x].bones = bonesT;
            if(meshes[x].sharedMesh==null){Debug.Log("Ignoring null mesh : " + meshes[x].name);continue;}
            //meshes[x].sharedMesh.RecalculateNormals();
            //meshes[x].sharedMesh.RecalculateBounds();
        }
    }
}