Alternatively, for the top part, you can use a Difference of two cylinders,
then put this difference into an Intersection with a cube.
Or, instead of an Intersection, use a second Difference. The cube should
then be at another place of course!
So, whatever you prefer (I prefer the Intersection solution).

Thomas

<mca### [at] aolcom (S McAvoy)> schreef in bericht
news:3eb39c14.6500016@news.povray.org...
> For the top part of the window use a Torus, with an inner radius about
95% of
> its outer radius, intersected by a cube, scaled to give you a bow <1.04,
2,
> 0.04> . Then for the rest of the frame use cubes with the Y and Z scale
0.04 and
> X scale as required for length. Don't take my figures as gospel they're
just
> what I used :-}
>
>
> Regards
>         Stephen

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