SpriteHelperEditorWindow.cs

using UnityEngine;
using UnityEditor;
using System.Collections;

namespace CatchCo.Diagram.EditorScripts
{
   public class SpriteHelperEditorWindow : EditorWindow
   {
      [MenuItem ("CatchCo/Sprite Helper")]
      private static void Init ()
      {
         EditorWindow.GetWindow (typeof(SpriteHelperEditorWindow));
      }

      private void OnGUI ()
      {
         if (GUILayout.Button ("Truncate all rotations")) {
            TruncateAllRotationsInScene ();
         }
      }

      private void TruncateAllRotationsInScene ()
      {
         Undo.IncrementCurrentGroup ();
         var transforms = Object.FindObjectsOfType<Transform> ();
         Undo.RecordObjects (transforms, "Undo truncate all rotations");
         foreach (var tx in transforms) {
            tx.localEulerAngles = TruncateRotation (tx.localEulerAngles);
            EditorUtility.SetDirty (tx);
         }

         Undo.CollapseUndoOperations (Undo.GetCurrentGroup ());

      }

      private Vector3 TruncateRotation (Vector3 localEulerAngles)
      {
         localEulerAngles.x = Mathf.RoundToInt (localEulerAngles.x);
         localEulerAngles.y = Mathf.RoundToInt (localEulerAngles.y);
         localEulerAngles.z = Mathf.RoundToInt (localEulerAngles.z);
         return localEulerAngles;
      }
   }
}