Attached an image showing a few isosurfaces based on a new f_path() 
inbuilt function.

Though called f_path, the function allows two to thirteen(a) vertice 
definitions; Plus a general ability to describe how those vertices 
should be connected - or not.

(Bill W. The code uses distance to 3D line segments internally)

Bill P.

(a) - I might later allow more vertices. The performance turned out 
better than I guessed it would be.

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