James Buddenhagen nous apporta ses lumieres en ce 2005-04-28 09:55:
> 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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When using the cubic_spline, the first and last points are *only* control points. When
using 
b_spline, the start and end "spots" are somewhere around the second and second to last
points. The 
exact position depend of the position of the first and third points for the starting
point. Both 
need at least 4 points.

Alain

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