/// <summary>
 /// See <see cref="BaseColorCache.Prepare"/> for more details.
 /// </summary>
 public override void Prepare()
 {
     base.Prepare();
     root = new OctreeCacheNode();
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="OctreeColorCache"/> class.
 /// </summary>
 public OctreeColorCache()
 {
     ColorModel = ColorModel.RedGreenBlue;
     root       = new OctreeCacheNode();
 }