Apparently the small size has something to do with it. I can see why Bruno 
probably didn't see anything wrong, I rendered it and got a mostly okay line 
except for a perpendicular dashed line intersecting it a little to the left 
of center.

I don't get many renderings made lately but I do have a recent scene file 
using a sphere_sweep to outline some property shown against aerial photos 
and I was starting with a scale of 1870 by 1750 pixels for the entire area 
but the property itself is only a fraction of that size. The sphere sweep 
broke into pieces when decimal numbers, similar to yours there, are used and 
I had to scale the whole thing upward to remove the breaks. Likewise, 
setting a tolerence wasn't helping it.

It might not seem reasonable for the sphere_sweep to be rendered incorrectly 
at a not-so-extremely small 0.027 radius compared to some other common 
objects but it wasn't too many POV versions ago that a sphere {<0,0,0>, 
0.02} had potential problems being rendered. I think the sphere_sweep might 
still be suffering a little from something like that, so the solution for 
you is probably going to be an increase of the scene scale. Looks to me like 
maybe a 0.1 radius could be okay, possibly just 0.08 (closest to where I 
couldn't see a problem while zoomed in on a defective part), or about three 
times, or more, that current radius.

If I'm wrong about this, anyone, please go ahead and debate my answer but 
that's what I found after some rescaling.  ;)

-- 
Bob H  www.3digitaleyes.com
http://3digitaleyes.com/imagery/

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