Ken got it right in the images section.  Your problem is a lack of
anti-aliasing.  You should be able to clear up your problem by using
some.  If you are using the windows version, it is as simple as changing
your render settings (up in the top left corner) in Dos or another
command line environment you need to add the command line switches that
Bob suggested.  There aren't any REAL cuts in the cylinders, they are
just what are called display artifacts (it is a display with discrete
elements (pixels), therefor a true analog image is hard to produce
without added calculations (ie AntiAliasing) even then, it isn't
perfect)

Steve


kane wrote:
> 
> hey guys
> I am a novice in Ray tracing.I would like to know if it is possible
> ,let's say ,to connect two points by one segment, just one segment (not
> a torus or ...),and this without being obliged to work in  2D

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