Sphere Properties 
The Sphere type exposes the following members.
Name  Description  

BoundingBox 
Gets the world aligned boundingbox for this Sphere.
If the Sphere is Invalid, an empty box is returned.
 
Center 
Gets or sets the center point of the sphere.
 
Diameter 
Gets or sets the diameter for this sphere.
 
EquitorialPlane 
Gets or sets the Equatorial plane for this sphere.
 
IsValid 
Gets a value that indicates whether the sphere is valid.
 
NorthPole 
Gets the point at the North Pole of the sphere.
This is the parameterization singularity that can be obtained, at V value +Math.Pi/2.  
Radius 
Gets or sets the Radius for this sphere.
 
SouthPole 
Gets the point at the South Pole of the sphere.
This is the parameterization singularity that can be obtained, at V value Math.Pi/2.  
Unset 
Gets a sphere with invalid members.
