internal void OnDeserialized(StreamingContext context)
{
Surfaces.ForEach(s => s.units = units);
Edges.ForEach(e => e.Brep = this);
Loops.ForEach(l => l.Brep = this);
Trims.ForEach(t => t.Brep = this);
Faces.ForEach(f => f.Brep = this);
//TODO: all the data props to the real props
}