Viewport vp = new Viewport();
vp.SetDatabaseDefaults();
//vp.CenterPoint = new Point3d(positionMV.X + 200, positionMV.Y + 200, positionMV.Z);
vp.CenterPoint = positionMV;
vp.Width = distanceX;
vp.Height = distanceY;
vp.ViewCenter = ptMVsup;
vp.Locked = true;
//vp.TwistAngle = 15;