How to re-apply a mesh to an armature?

Question

Hi!

I created a rigged character in blender, imported it to unity and applied rigidbodies to the armature to create a ragdoll. So far so good.

In blender, I added another mesh (a clothing layer) attached to the same armature. Upon importing this into Unity, the character in the prefab I already had there is twisted and weird. However, if I simply drag the new model into the scene, it looks good. Because it took a lot of effort to set up the ragdoll, I do not want to apply all the rigidbodies and joints again.

I want to apply the new mesh to the old armature.

Re-coupling a mesh to another armature seems pretty much impossible - no matter what I do the mesh follows the original armature which spawned with it on dragging the asset to the scene. Even if that original armature is deleted!

From my understanding this is because the mesh's Bone Weights are coupled to that armature. How do I change which armature they are hooked up to?

Thanks!

Answer 1

Solved it! Add the below code to a monobehavior. Add the monobehavior to the (same transform as the) SkinnedMeshRenderer. Now drag the base transform of the new armature you want to assign to the Armature slot in the inspector, and click the checkbox to activate the script.

The script will go through the Bones of the mesh, and try to re-assign to bones of the same name in the new armature.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 
 [ExecuteInEditMode]
 public class ReassignBoneWeigthsToNewMesh : MonoBehaviour
 {
     public Transform newArmature;
     public string rootBoneName = "Hips";
     public bool PressToReassign;
 
     void Update()
     {
         if (PressToReassign)
             Reassign();
         PressToReassign = false;
     }
 
     // [ContextMenu("Reassign Bones")]
     public void Reassign()
     {
         if (newArmature == null) {
             Debug.Log("No new armature assigned");
             return;
         }
 
         if (newArmature.Find(rootBoneName) == null) {
             Debug.Log("Root bone not found");
             return;
         }
 
         Debug.Log("Reassingning bones");
         SkinnedMeshRenderer rend = gameObject.GetComponent<SkinnedMeshRenderer>();
         Transform[] bones = rend.bones;
 
         rend.rootBone = newArmature.Find(rootBoneName);
 
         Transform[] children = newArmature.GetComponentsInChildren<Transform>();
 
         for (int i = 0; i < bones.Length; i++)
             for (int a = 0; a < children.Length; a++)
                 if (bones[i].name == children[a].name) {
                     bones[i] = children[a];
                     break;
                 }
 
         rend.bones = bones;
     }
 
 }

How to re-apply a mesh to an armature?

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