Hi!

I worked on the problem and I posted in p.b.i + p.b.s-f a solution with
sphere_sweep, and also with a blob (fast render) with a constant behaviour
(I think ..). Your problem might come from the use of the parametric form
of an ellipse, which gives non-constant spacing between samples on the
perimeter from regular parametric values, or/and perhaps from the use of too
few control points in the spline.

The blob macro I posted uses also the parametric equation, but travels along
the perimeter by oversampling, an drops a blob element every constant
spacing, giving quite good results. I hope thi will help, and I am sure
that what I did can be very much improved.

    Bruno

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