Here are two pics, related to the 'hexagonalized torus' thread I 
started earlier.  Each picture consists of 6 wavy sphere sweeps 
each going around the torus four times, each containing 
approximately 100 points.  Each sphere sweep is supposed to be 
a closed path, with identical first and last point. 

When I did this with 'linear' sphere sweeps the paths closed 
as they should [picture not shown].  But with 'cubic_spline' 
and 'b_spline' sweeps the paths failed to close, even though 
the first and last points were identical.  The first picture 
shows six gaps, upper right slightly on back side of torus. 

In the second picture I fixed this by overlaping the start and 
the tail of the paths, not by one but by TWO points.  It was 
a surprise to me that I would have to do this.  

Here are the pics. 
--
Jim Buddenhagen

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