Sphere

Description
The sphere primitive is defined by its central point and radius. It is created with CSX = AddSphere(CSX, propName, prio, center, rad, varargin) with the following parameters:
 * CSX: The original CSX structure
 * propName: name of the assigned property
 * prio: priority of the primitive
 * center: coordinate of the center point of the sphere
 * rad: radius of the sphere
 * varargin: a key/value list of primitives variable arguments

Example
CSX = AddSphere(CSX,'material',1,[0 0 0], 200);
 * Create a sphere at (0,0,0) with radius 200: