I actually have not had any luck with /any/ of the techniques submitted
here.  (Everyone's responses are appreciated, nonetheless; this is not the
voice of ingratitude speaking )
The problem seems to come when I try and union or merge the two partial arcs
so that they form the characteristically Gothic ogival arch.  When I made
the actual archway, intersecting two inverse cylinders (or subtracting two
intersected cylinders from a 'box' ) was no problem.
I just can't get the tori to behave the same, because there is open space in
the middle.
I was at a concert in a Gothic-style chapel last night, and was getting
ideas about possibly trying to stack many prism objects, rotating them
around the edge of the arch...
I'm also researching options in a modeller, such as Blender, but have yet to
get up to speed on its UI.
Maybe I'm just too ambitious for a new user...

Thanks,
Mark

David Fontaine <dav### [at] faricynet> wrote in message
news:3A68DD89.16525697@faricy.net...
> Your question's been answered, but I would point out to you that if you
want to
> do an arc greater than 180 degrees, you must intersect or difference with
a
> merge of two planes, because a plane obviously can't be more than 180
degrees.
>
> --
> David Fontaine  <dav### [at] faricynet>  ICQ 55354965
> My raytracing gallery:  http://davidf.faricy.net/
>
>

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