Unity Editor Script Replace Mesh

ReplaceMesh.cs

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


public class ReplaceMesh : EditorWindow
{
	[MenuItem("Window/Help/Mesh/Replace")]
	private static void Init()
	{
		ReplaceMesh _window = GetWindow<ReplaceMesh>();

		_window.titleContent = new GUIContent("Replace Mesh");
		_window.Show();
		
	}// Init()
	
	
	private Mesh _M_from;
	
	private Mesh _M_to;
	
	private Vector3 _V3_offset;
	
	private bool _b_savePrefab = true;
	
	private MeshFilter[] _aMF_instances;
	
	
	private void OnGUI()
	{
		// from
		_M_from = (Mesh)EditorGUILayout.ObjectField("Find", _M_from, typeof(Mesh), true);
		
		// to
		_M_to = (Mesh)EditorGUILayout.ObjectField("Replace with", _M_to, typeof(Mesh), false);
		
		// offset
		_V3_offset = EditorGUILayout.Vector3Field("Offset Rotation", _V3_offset);
		
		// save prefab ?
		_b_savePrefab = EditorGUILayout.Toggle("Save Prefab", _b_savePrefab);
		
		if(_aMF_instances != null)
		{
			GUILayout.Label("Find " + _aMF_instances.Length + " instance(s).");
		}
		
		if(_M_from != null)
		{
			if(GUILayout.Button("Find")) FindInstances();
			
			if(_M_to != null)
			{
				if(GUILayout.Button("Replace"))
				{
					FindInstances();
					
					ReplaceInstances();
				}
			}
		}
		
	}// OnGUI()
	
	
	private void FindInstances()
	{
		_aMF_instances = (MeshFilter[])GameObject.FindObjectsOfType(typeof(MeshFilter));
		
		List<MeshFilter> _LMF = new List<MeshFilter>(_aMF_instances.Length);
		
		for(int i = 0; i < _aMF_instances.Length; i++)
		{
			if(_aMF_instances[i].sharedMesh == _M_from) _LMF.Add(_aMF_instances[i]);
			
		}//for()
		
		_aMF_instances = _LMF.ToArray();
		
	}// FindInstances()
	
	
	private void ReplaceInstances()
	{
		if(!ICollectionHelper.IsNullOrEmpty(_aMF_instances))
		{
			if(!_b_savePrefab)
			{
				for(int i = 0; i < _aMF_instances.Length; i++)
				{
					if(_aMF_instances[i] != null)
					{
						// set mesh
						_aMF_instances[i].sharedMesh = _M_to;
						
						// change rotation
						Vector3 _V3_rot = _aMF_instances[i].transform.localRotation.eulerAngles;
						_V3_rot += _V3_offset;
						_aMF_instances[i].transform.localRotation = Quaternion.Euler(_V3_rot);
					}
					
				}//for()
			}
			else
			{
				for(int i = 0; i < _aMF_instances.Length; i++)
				{
					if(_aMF_instances[i] != null)
					{
						// set mesh
						_aMF_instances[i].sharedMesh = _M_to;
						
						// change rotation
						Vector3 _V3_rot = _aMF_instances[i].transform.localRotation.eulerAngles;
						_V3_rot += _V3_offset;
						_aMF_instances[i].transform.localRotation = Quaternion.Euler(_V3_rot);
						
						Object obj = PrefabUtility.GetPrefabParent(_aMF_instances[i].gameObject);
						
						if(obj != null)
						{
							PrefabUtility.ReplacePrefab(_aMF_instances[i].gameObject, obj, ReplacePrefabOptions.ConnectToPrefab | ReplacePrefabOptions.ReplaceNameBased);
						}
					}
					
				}//for()
			}
		}
		
	}// ReplaceInstances()
	
}// ReplaceMesh