public static Microsoft.Xna.Framework.BoundingSphere xna(this SlimDX.BoundingSphere v)
 {
     return(new Microsoft.Xna.Framework.BoundingSphere(v.Center.xna(), v.Radius));
 }
 public BoundingSphere(Vector3 center, float radius)
 {
     bdx = new SlimDX.BoundingSphere(center.dx(), radius);
 }