Unity - Save Material

    //Save materials
    meshRenderer = target.GetComponent<MeshRenderer> ();
    savedMaterials = meshRenderer.materials;
    Material[] newMat = new Material[savedMaterials.Length];
        for (int i = 0; i < newMat.Length; i++) {
        newMat [i] = highLight;
        }
    meshRenderer.materials = newMat;


  void OnPositionChanged (Vector3 newPos)
        {
            highLight.color = em.IsAvailablePosition (newPos) ? Color.green : Color.red;
        }