Chrisir nous apporta ses lumieres en ce 2005-08-02 05:48:
> 
> Hello!
> 
> I am still struggling with my arcs I wanted to have like an up-side-down U
> (see posting some weeks back).
> 
> I started with a spline, placing spheres on it, but this is far to slow to
> render since I have *a lot* of those arcs. Is there any quick arc? Maybe
> originated from a torus or some other trick?
> 
> I like them in a right-angle above my plane,
> give the start-point P1 and end-point P2 and a certain height h.
> 
> A macro with three parameters P1,P2,h would be cool!
> 
> Thanks!
> 
> 
> 
> 
> 
If the "legs" are straight and the bend a contant radius, then you can use an union of
a half torus 
and two cylinders. Those cylinders don't need to have the same lenght.
If the curve is not constant, then you should take a look at sphere_sweep using a
cubic_spline to 
keep controll over the end points (points 2 and second to last, first and last are
control points)

Alain

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