public void ClearFlagsBits(BVHNodeFlags bits)
 {
     _flags &= ~bits;
 }
 public bool IsFlagBitSet(BVHNodeFlags bit)
 {
     return((_flags & bit) != 0);
 }
 public void SetFlagsBits(BVHNodeFlags bits)
 {
     _flags |= bits;
 }
 public void SetFlags(BVHNodeFlags flags)
 {
     _flags = flags;
 }