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	    Analytic primitives 
	    
	   
	     
	  These directly generated objects include the cube, the cone, the cylinder, 
	  the sphere, and the torus. They can all be generated as complete or partial 
	  objects, which can be solid or surface objects. For each, a variety of drawing 
	  options are available which allow the interactive control of the different 
	  features of these objects. They are all parametric and can be editied after 
	  their generation. 
	 
	     
	  
	Special types of primitive objects are the paraboloid, hyperboloid, and the hyperbolic paraboloid.  
	  They can be drawn and generated on the regular primitives.  
	   
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