public float GetCubedSize()
 {
     return((float)System.Math.Pow(GridGroups.Sum(g => g.LocalAABB.Size.X * g.LocalAABB.Size.Y * g.LocalAABB.Size.Z), 1 / 3d));
 }
 public float GetMass()
 {
     return(GridGroups.Where(g => g.Physics != null).Sum(g => g.Physics.Mass));
 }