using System.Collections;
using UnityEngine;
using UnityEditor;

class ShowSize : EditorWindow
{
    [MenuItem("Window/ShowSize")]
    static void Init()
    {
        // Get existing open window or if none, make a new one:
        ShowSize sizeWindow = new ShowSize();
        sizeWindow.autoRepaintOnSceneChange = true;
        sizeWindow.Show();
    }

    void OnGUI () {
      GameObject thisObject = Selection.activeObject as GameObject;
      if (thisObject == null)
      {
          return;
      }

      MeshFilter mf = thisObject.GetComponent(typeof(MeshFilter)) as MeshFilter;
      if (mf == null)
      {return;}

      Mesh mesh = mf.sharedMesh;
      if (mesh == null)
      {return;}

      Vector3 size = mesh.bounds.size;
      Vector3 scale = thisObject.transform.localScale;
      GUILayout.Label("Size\nX: " + size.x*scale.x + "   Y: " + size.y*scale.y + "   Z: " + size.z*scale.z);
   }

}