In article <3a6c9cdf$1@news.povray.org>, "Mark M. Wilson" 
<mrm### [at] worldnetattnet> wrote:

> 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. 

Maybe this is what you want instead of arc segments:
intersection {
    union {
        intersection {
            torus {1, 0.25 rotate x*90 translate -x*0.25}
            plane {-x, 0}
        }
        intersection {
            torus {1, 0.25 rotate x*90 translate x*0.25}
            plane {x, 0}
        }
    }
    plane {-y, 0}
}

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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